5 Colo. Code Regs. § 1002-42.7

Current through Register Vol. 47, No. 11, June 10, 2024

Section 5 CCR 1002-42.7 - SITE-SPECIFIC GROUNDWATER CLASSIFICATIONS AND WATER QUALITY STANDARDS

The statewide standards for organic chemicals and radioactive materials set forth in section 41.5 C of The Basic Standards for Groundwater apply to all groundwater for which site specific classifications and standards have been adopted, unless the Commission specifies otherwise in the site-specific standards for a particular specified area.

The following classifications and standards shall not be interpreted so as to cause material injury to water rights in accordance with 25-8-104 C.R.S. (1989):

(1)ROCKY FLATS AREA, JEFFERSON AND BOULDER COUNTIES

(a)Specified Area: All unconfined groundwaters within

i) the Upper Hydro-Stratigraphic Unit (UHSU), including the unconsolidated Quaternary and Rocky Flats alluvium, colluvium and valley fill alluvium, and weathered claystone and hydraulically connected sandstone bedrock of the Arapahoe and Upper Laramie formations;

ii) the Arapahoe and Upper Laramie aquifers not hydraulically connected to the UHSU; and

iii) the Laramie-Fox Hill aquifer, within the area shown on Figure 1.

(b)Classification: The classification of the groundwaters within the specified area is:

1. Upper Hydro-Stratigraphic Unit:

* Surface Water Protection

(c)Water Quality Standards:

(i) The water quality standards included in section 31.11 (statewide surface water radioactive materials standards), section 31.11 (statewide surface water interim organic pollutant standards), and the site-specific surface water quality standards for segments 4a, 4b and 5 of Big Dry Creek (in section 38.6 of the South Platte Basin Classifications and Standards) are assigned to UHSU groundwater described in 42.7(1)(a).

(ii) An agency implementing the standards may, if it has authority, set a compliance standard different from the listed standard and equal to the background level if the implementing agency has the authority to exceed that standard.

(iii) Where a toxic substance for which no numerical standard has been established is found in a detectable amount, notification shall be given as soon as possible to the operator of the Rocky Flats Environmental Technology Site; the United States Department of Energy; the United States Environmental Protection Agency; and the Water Quality Control Division, which will consult as necessary with other components of the Colorado Department of Public Health and Environment. Those entities will meet and attempt to reach a consensus concerning the appropriate numerical protection level for that substance. If consensus is a numerical protection level. Where consensus cannot be reached, the Division will determine the appropriate numerical protection level.

In setting a numerical protection level, the entities listed above will consider the existing and any reasonably probable future beneficial uses of groundwater that need to be protected in the vicinity of the discharge, and establish the appropriate corresponding numerical protection levels for specific contaminants, based on those beneficial uses, as outlined in section 41.5 of "The Basic Standards for Groundwater." The entities will take into account reasonably available information.

A determination made by these entities or the Division in accordance with the procedure described above will not be deemed to constitute a groundwater quality standard and will not be applicable outside the specified area for this hearing.

If numerical protection levels are established by agreement of the entities, they will jointly petition the Commission for rulemaking to set a standard at the numerical protection level. If the Division establishes a numerical protection level without agreement of all entities, the Division shall ask the Commission to set a standard consistent with the numerical protection level.

If any interested person disagrees with a determination made by the Division in accordance with the procedure described above, it may petition the Commission to adopt a site-specific standard different from the numerical protection level. Any determination made by the Commission during the hearing process would then become binding on the Division, the Department of Energy, and the operator of the Rocky Flats Environmental Technology Site. At the request of the Department of Energy or the operator of the Rocky Flats Site or an interested person, the Commission will consider such a hearing to be mandatory and de novo.

SITE-SPECIFIC RADIONUCLIDE STANDARDS* (in Picocuries/Liter)

A. Ambient based site-specific standards for groundwaters in the UHSU hydraulically connected to the surface streams shown:

Segment 4 Segment 5 Woman Creek	Segment 4 Segment 5 Walnut Creek
Gross alpha	7	11
Gross Beta	8	19
Tritium	500	500
Uranium	11	10

* Statewide Standards also apply for radionuclides not listed above.

(2)CITY OF BRUSH WELLFIELD, MORGAN COUNTY

(a)Specified Area: All unconfined groundwaters within the saturated zone underlying that area as illustrated in Figure 2.

(b)Classification: The classifications of the unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Tables 1 - 4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all unconfined groundwater in the specified area.

(3)UPPER BLACK SQUIRREL CREEK ALLUVIAL AQUIFER, EL PASO COUNTY

(a)Specified Area: All unconfined groundwaters within the saturated zone underlying that area of El Paso County shown on Figure 3.

(b)Classification: The classifications of the unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(4)CITY OF ALAMOSA WELLFIELD, ALAMOSA COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 4. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(5)EAST CHERRY CREEK VALLEY WATER & SANITATION DISTRICT, ARAPAHOE COUNTY

(a)Specified Area: All groundwater underlying the area illustrated in Figure 5 within the saturated zone of the Denver Basin aquifers to include the Denver, Arapahoe, and Laramie-Fox Hills aquifers as defined by the Colorado Division of Water Resources' Denver Basin Rules (2 CCR 402-6); also the Dawson aquifer as defined by the Colorado Division of Water Resources' Denver Basin Rules (2 CCR 402-6), and all of the alluvial and unconfined groundwater overlying the Denver Basin aquifers and underlying the area illustrated in Figure 5. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the groundwater in the Denver, Arapahoe, and Laramie-Fox Hills aquifers within the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

The interim narrative standard, as specified in the "Classifications and Water Quality Standards for Groundwater" 42.0 (5 CCR 1002-42), shall be applicable to the groundwater in the Dawson aquifer and all of the alluvial and unconfined groundwater overlying the Denver Basin Aquifers within the specified area:

(6)FEDERAL HEIGHTS WATER DISTRICT WELLFIELD, ADAMS COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 6. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(7)CITY OF FOUNTAIN, SECURITY WATER & SANITATION DISTRICT, STRATMOOR HILLS WATER DISTRICT, AND WIDEFIELD HOMES WATER COMPANY WELLFIELDS, EL PASO COUNTY. SPECIFIED AREA INCLUDES THE WIDEFIELD AQUIFER, WINDMILL GULCH AQUIFER, SAND CREEK AQUIFER, CREWS GULCH AQUIFER, FOUNTAIN CREEK ALLUVIAL AQUIFER AND OTHER ADJACENT UNCONFINED AQUIFERS IN EL PASO COUNTY.

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the following Public Land Survey System (PLSS) sections in El Paso County (Figure 7):

Township	Range	Section	Township	Range	Section
T13S	R65W	S30	T14S	R65W	S28
T13S	R65W	S31	T14S	R65W	S29
T13S	R66W	S36	T14S	R65W	S30
T14S	R64W	S19	T14S	R65W	S31
T14S	R64W	S30	T14S	R65W	S32
T14S	R65W	S06	T14S	R65W	S33
T14S	R65W	S07	T14S	R65W	S34
T14S	R65W	S15	T14S	R65W	S35
T14S	R65W	S16	T14S	R65W	S36
T14S	R65W	S17	T14S	R66W	S01
T14S	R65W	S18	T14S	R66W	S12
T14S	R65W	S19	T14S	R66W	S13
T14S	R65W	S20	T14S	R66W	S14
T14S	R65W	S21	T14S	R66W	S19
T14S	R65W	S22	T14S	R66W	S20
T14S	R65W	S23	T14S	R66W	S21
T14S	R65W	S24	T14S	R66W	S22
T14S	R65W	S25	T14S	R66W	S23
T14S	R65W	S26	T14S	R66W	S24
T14S	R65W	S27	T14S	R66W	S25
T14S	R66W	S26	T15S	R65W	S17
T14S	R66W	S27	T15S	R65W	S18
T14S	R66W	S28	T15S	R65W	S19
T14S	R66W	S29	T15S	R65W	S20
T14S	R66W	S30	T15S	R65W	S21
T14S	R66W	S32	T15S	R65W	S22
T14S	R66W	S33	T15S	R65W	S23
T14S	R66W	S34	T15S	R65W	S26
T14S	R66W	S35	T15S	R65W	S27
T14S	R66W	S36	T15S	R65W	S28
T15S	R65W	S01	T15S	R65W	S29
T15S	R65W	S02	T15S	R65W	S30
T15S	R65W	S03	T15S	R65W	S31
T15S	R65W	S04	T15S	R65W	S32
T15S	R65W	S05	T15S	R65W	S33
T15S	R65W	S06	T15S	R65W	S34
T15S	R65W	S07	T15S	R66W	S01
T15S	R65W	S08	T15S	R66W	S02
T15S	R65W	S09	T15S	R66W	S03
T15S	R65W	S10	T15S	R66W	S04
T15S	R65W	S11	T15S	R66W	S10
T15S	R65W	S12	T15S	R66W	S11
T15S	R65W	S13	T15S	R66W	S12
T15S	R65W	S14	T15S	R66W	S13
T15S	R65W	S15	T15S	R66W	S14
T15S	R65W	S16	T15S	R66W	S15
T15S	R66W	S23	T16S	R65W	S32
T15S	R66W	S24	T16S	R65W	S33
T15S	R66W	S25	T16S	R65W	S34
T15S	R66W	S26	T16S	R66W	S01
T15S	R66W	S36	T16S	R66W	S08
T16S	R65W	S03	T16S	R66W	S09
T16S	R65W	S04	T16S	R66W	S10
T16S	R65W	S05	T16S	R66W	S11
T16S	R65W	S06	T16S	R66W	S12
T16S	R65W	S07	T16S	R66W	S13
T16S	R65W	S08	T16S	R66W	S14
T16S	R65W	S09	T16S	R66W	S15
T16S	R65W	S10	T16S	R66W	S16
T16S	R65W	S15	T16S	R66W	S17
T16S	R65W	S16	T16S	R66W	S20
T16S	R65W	S17	T16S	R66W	S21
T16S	R65W	S18	T16S	R66W	S22
T16S	R65W	S19	T16S	R66W	S23
T16S	R65W	S20	T16S	R66W	S24
T16S	R65W	S21	T16S	R66W	S25
T16S	R65W	S22	T16S	R66W	S26
T16S	R65W	S27	T16S	R66W	S27
T16S	R65W	S28	T16S	R66W	S28
T16S	R65W	S29	T16S	R66W	S29
T16S	R65W	S30	T16S	R66W	S31
T16S	R65W	S31	T16S	R66W	S32
T16S	R66W	S33	T17S	R66W	S03
T16S	R66W	S34	T17S	R66W	S04
T16S	R66W	S35	T17S	R66W	S05
T16S	R66W	S26	T17S	R66W	S06
T17S	R65W	S03	T17S	R66W	S07
T17S	R65W	S04	T17S	R66W	S08
T17S	R65W	S05	T17S	R66W	S09
T17S	R65W	S06	T17S	R66W	S10
T17S	R65W	S09	T17S	R66W	S11
T17S	R65W	S10	T17S	R66W	S12
T17S	R66W	S01	T17S	R66W	S17
T17S	R66W	S02	T17S	R66W	S18

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: For the specified area, the groundwater quality standards included in Tables 1 - 4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all groundwater.

(d)Additional Groundwater Quality Standards for the Specified Area:

(i) The sum of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) = 0.070 micrograms per liter.

(8)CITY OF LAMAR WELLFIELD, PROWERS COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 8. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(9)VAIL VALLEY CONSOLIDATED WATER DISTRICT WELLFIELDS, EAGLE COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 9. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 - 4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all confined and unconfined groundwater in the specified area.

(10)WILLOWS, AND CENTENNIAL GROUNDWATER CLASSIFICATION AREA, ARAPAHOE AND DOUGLAS COUNTIES

(a)Specified Area: All groundwaters underlying the area illustrated in Figure 10 and within the saturated zone of the Denver Basin aquifer system as defined by the Colorado Division of Water Resources' Denver Basin Rules (2 CCR 402-6) to include the Dawson, Denver, Arapahoe, and Laramie-Fox Hills aquifers and all the alluvial and unconfined groundwater overlying the Denver Basin aquifers. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the groundwater in the Dawson, Denver, Arapahoe, and Laramie-Fox Hills aquifers in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

The classification of the alluvial and unconfined groundwater overlying the Denver Basin aquifers in the specified area is:

* Agricultural Use-Quality

The groundwater quality standards included in the Tables 3 and 4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all alluvial and unconfined groundwater overlying the Denver Basin aquifers in the specified area.

(11)TOWN OF BENNETT WELLFIELD, ADAMS COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 11. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(12)CITY OF BURLINGTON WELLFIELD, KIT CARSON COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 12. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(13)TOWN OF CARBONDALE WELLFIELD, GARFIELD COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 13. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(14)TOWN OF CASTLE ROCK WELLFIELD, DOUGLAS COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 14. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(15)CROWLEY COUNTY WATER SYSTEM WELLFIELD, CROWLEY COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 15. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Tables 1-4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all confined and unconfined groundwater in the specified area.

(16)DENVER SOUTHEAST SUBURBAN WATER & SANITATION DISTRICT WELLFIELD, DOUGLAS COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 16. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Tables 1-4 of the "Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all confined and unconfined groundwater in the specified area.

(17)EAST DILLON WATER DISTRICT WELLFIELD, SUMMIT COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 17. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(18)CITY OF GLENDALE AND CHERRY CREEK VALLEY WATER AND SANITATION DISTRICT GROUNDWATER CLASSIFICATION AREA, ARAPAHOE COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 18. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(19)CITY OF GUNNISON WELLFIELD, GUNNISON COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 19. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(20)CITY OF LA JUNTA WELLFIELD, OTERO COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 20. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(21)MORGAN COUNTY QUALITY WATER DISTRICT WELLFIELD, MORGAN COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 21. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(22)NORTHERN COLORADO WATER ASSOCIATION WELLFIELD, LARIMER COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 22. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(23)PARK CENTER WATER DISTRICT WELLFIELD, FREMONT COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 23. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classification: The classification of the confined and unconfined groundwater in the specified area is:

* Domestic Use-Quality

(24)SAN LUIS WATER & SANITATION DISTRICT WELLFIELD, COSTILLA COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 24. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(25)TOWN OF SPRINGFIELD WELLFIELD, BACA COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 25. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(26)WOODMOOR WATER AND SANITATION DISTRICT WELLFIELD, EL PASO COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 26.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(27)CITY OF WRAY WELLFIELD, YUMA COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 27.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(28)CITY OF YUMA WELLFIELD, YUMA COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 28. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(29)CITY OF BRIGHTON WELLFIELD, ADAMS COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 29. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(30)TOWN OF ECKLEY WELLFIELD, YUMA COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 30. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(31)CITY OF FORT LUPTON WELLFIELD, WELD COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 31. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(32)CITY OF FORT MORGAN WELLFIELD, MORGAN COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 32. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Tables 1 - 4 of the Basic Standards for Groundwater" 41.0 (5 CCR 1002-41) are assigned to all confined and unconfined groundwater in the specified area.

(33)TOWN OF HASWELL WELLFIELD, KIOWA COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 33. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(34)TOWN OF LAS ANIMAS WELLFIELD, BENT COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 34. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(35)TOWN OF MEEKER WELLFIELD, RIO BLANCO COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 35. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(36)MORGAN COUNTY QUALITY WATER DISTRICT, (SAN ARROYO CREEK BASIN), MORGAN COUNTY

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 36. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(37)CITY OF STERLING WELLFIELD, LOGAN COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area, EXCEPT FOR THE GROUNDWATER CONTAINED WITHIN THE LOWER CRETACEOUS DAKOTA GROUP D, J, AND O SANDSTONES, as illustrated in Figure 37. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(38)SOUTHWEST WATER PROTECTION AREA, KIT CARSON COUNTY

(a)Specified Area: All confined and unconfined groundwater within the saturated zone underlying the area as illustrated in Figure 38. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(39)UPPER CHERRY CREEK BASIN AND DENVER BASIN ALLUVIAL AQUIFERS AND TRIBUTARIES, PORTIONS OF EL PASO, DOUGLAS AND ARAPAHOE COUNTIES

(a)Specified Area: All confined and unconfined groundwaters within the saturated zone underlying the area as illustrated in Figure 39. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classifications of the confined and unconfined groundwater in the specified area are:

* Domestic Use-Quality

* Agricultural Use-Quality

(40)COLORADO OIL AND GAS FIELDS OF LOGAN, NORTHERN WASHINGTON, AND NORTHEASTERN MORGAN COUNTIES, COLORADO

(a)Specified Area: The confined groundwaters within the Lower Cretaceous aged Dakota Group including the D, J, and O Sandstones underlying the area illustrated in Figure 40. Maps depicting each specified area on a larger scale are available in the Commission Office.

(b)Classifications: The classification of the groundwater in the D, J, and O Sandstones is:

* Limited Use and Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater Regulation No. 41 (5 CCR 1002-41) will not apply to the confined groundwater of the D, J, and O Sandstones in the specified area.

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater of the D, J, and O Sandstones in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(41)RANGLEY OIL AND GAS FILED OF RIO BLANCO COUNTY

(a)Specified Area: The confined groundwaters within the Weber Formation and the Navajo Sandstone underlying the area illustrated in Figure 41.

(b)Classifications: The classification of the groundwater in the Weber Formation and the Navajo Sandstone is:

* Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Weber Formation and the Navajo Sandstone within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(42)OIL AND GAS FIELDS OF EASTERN LARIMER COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Entrada Sandstone and Muddy Sandstone (J Sand) underlying the area illustrated in Figure 42.

(b)Classifications: The classification of the groundwater in the Entrada Sandstone and Muddy Sandstone (J Sand) is:

* Limited Use and Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Entrada Sandstone and Muddy Sandstone (J Sand) within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Entrada Sandstone and Muddy Sandstone (J Sand) within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(43)OIL AND GAS FIELDS OF EAST-CENTRAL JACKSON COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Dakota and Lakota Sandstones and the Pierre B Sandstone Member of the Pierre Shale underlying the area illustrated in Figure 43.

(b)Classifications: The classification of the groundwater in the Dakota and Lakota Sandstones and the Pierre B Sandstone Member of the Pierre Shale is:

* Limited Use and Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Dakota and Lakota Sandstones and the Pierre B Sandstone Member of the Pierre Shale within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Dakota and Lakota Sandstones and the Pierre B Sandstone Member of the Pierre Shale within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas..

(44)OIL AND GAS FIELD OF WEST-CENTRAL JACKSON COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Dakota and Lakota Sandstones underlying the area illustrated in Figure 44.

(b)Classifications: The classification of the groundwater in the Dakota and Lakota Sandstones is:

* Limited Use and Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Dakota and Lakota Sandstones within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Dakota and Lakota Sandstones within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(45)OIL AND GAS FIELDS OF NORTHERN MOFFAT COUNTY, COLORADO

(a)Specified Area: The confined groundwater within the Fort Union Formation underlying the area illustrated in Figure 45.

(b)Classifications: The classification of the groundwater in the Fort Union Formation is:

* Limited Use and Quality

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Fort Union Formation within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(46)OIL AND GAS FIELDS OF WELD COUNTY, COLORADO

(a) Specified Area: The confined groundwater in the Lyons Sandstone underlying the area illustrated in Figure 46.

(b) Classifications: The classification of the groundwater in the Lyons Sandstone is:

* Limited Use and Quality

(c) Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Lyons Sandstone within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Lyons Sandstone within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(47)OIL AND GAS FIELDS OF WELD COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Parkman Sandstone underlying the area illustrated in Figure 47.

(b)Classifications: The classification of the groundwater in the Parkman Sandstone is:

* Limited Use and Quality

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Parkman Sandstone within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(48)OIL AND GAS FIELDS OF WELD COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Sussex Sandstone underlying the area illustrated in Figure 48.

(b)Classifications: The classification of the groundwater in the Sussex Sandstone is:

* Limited Use and Quality

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Sussex Sandstone within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(49)OIL AND GAS FIELDS OF ADAMS, ARAPAHOE, MORGAN, WASHINGTON, AND WELD COUNTIES, COLORADO

(1)Specified Area: The confined groundwater in the D and J Sandstones underlying the areas illustrated in Figures 49A, 49B, 49C.

(2)Classifications: The classification of the groundwater in the D and J Sandstones is:

* Limited Use and Quality

(3)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41 will not apply to the confined groundwater of the D and J Sandstones within the specified areas.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the D and J Sandstones within the specified areas. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(50)OIL AND GAS FIELD OF RIO BLANCO COUNTY, COLORADO

(1)Specified Area: The confined groundwater in the Morrison and Sundance Formations underlying the area illustrated in Figure 50.

(2)Classifications: The classification of the groundwater in the Morrison and Sundance Formations are:

* Limited Use and Quality

(3) Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Morrison and Sundance Formations within the specified area.

wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(51)OIL AND GAS FIELD OF BACA COUNTY, COLORADO

(a)Specified Area: The confined groundwater in the Lansing Formation underlying the area illustrated in Figure 51.

(b)Classifications: The classification of the groundwater in the Lansing Formation are:

* Limited Use and Quality

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethyibenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the. Lansing Formation within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(52)OIL AND GAS FIELD OF CHEYENNE COUNTY AND KIT CARSON COUNTIES, COLORADO

(a)Specified Area: The confined groundwater in the Morrow Formation underlying the area illustrated in Figures 52A AND 52B.

(b)Classifications: The classification of the groundwater in the Morrow Formation are:

* Limited Use and Quality

(c) Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Morrow Formation within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethyibenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Morrow Formation within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(53)HIAWATHA OIL AND GAS FIELD OF MOFFAT COUNTY, COLORADO

(a)Specified Area: The confined groundwater in a portion of the Tertiary Wasatch Formation (Middle Oil Sand Zone) underlying the area illustrated in Figure 53.

(b)Classifications: The classification of the confined groundwater in the Middle Oil Sand portion of the Tertiary Wasatch Formation is: Limited Use and Quality

(c)Groundwater Quality Standards: The groundwater quality standards included in Table 1 through 4 of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) will not apply to the confined groundwater of the Middle Oil Sand zone of the Tertiary Wasatch Formation within the specified area.

The groundwater organic chemical standards included in Table A of the Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the Middle Oil Sand portion of the Tertiary Wasatch Formation within the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas.

(54)FORMER LOWRY AIR FORCE BASE, CITY AND COUNTY OF DENVER AND CITY OF AURORA, ARAPAHOE COUNTY, COLORADO

(a) Specified Areas: The unconfined groundwater in the following locations:

i. On-Base

1. Alluvial groundwater underlying the areas illustrated and described in Figure 54A as HQ Plume. Main Plume On-Base, and 1432 Source Area.

2. The upper 50 feet of Denver Aquifer groundwater underlying the areas illustrated and described in Figure 54B as HQ Plume. FTZ Plume. OFR Source Area. Main Plume On-Base. 1432 Source Area and CT Source Area.

ii. Off-Base

1. Alluvial groundwater, underlying the area illustrated and described in Figure 54A as 11th Avenue to 17th Avenue and North of 17th Avenue.

2. The upper 50 feet of the Denver Aquifer groundwater, underlying the area illustrated and described in Figure 54B as Main Plume Off-Base.

(b) Classifications: The classification of each of the Specified Areas identified in Section 54(a). above is: Potentially Usable Quality.

(c) Groundwater Quality Standards: For the Specified Areas, the groundwater quality standards included in Tables 1 - 4, the Radioactive Materials Standards Table, and the organic chemical standards in Table A of the Basic Standards for Groundwater 41.0 (5 CCR 1002-41) are assigned to all groundwater, except for the organic chemicals identified below, the following site-specific standards shall apply in the Specified Areas and the organic chemical standard set forth in Table A. Section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) shall not apply.

Site Specific Concentrations and Classifications On-Base
Area	Classification	Geologic Unit	Parameter	Site Specific Standard
HQ Plume	Potentially Usable Quality	Alluvium	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
Main Plume		Alluvium	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
1432 Source Area		Alluvium	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l

Site Specific Concentrations and Classifications On-Base
Area	Classification	Geologic Unit	Parameter	Site Specific Standard
HQ Plume	Potentially Usable Quality	Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
FTZ Plume		Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
OFR Source Area		Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
Main Plume		Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
1432 Source Area		Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
CT Source Area		Bedrock	Trichloroethylene	11 µg/l
			1,4-Dioxane	3.2 µg/l
Site Specific Concentrations and Classification Off-Base
Area	Classification	Geologic Unit	Parameter	Site Specific Standard
Main Plume North of 17th Avenue	Potentially Usable Quality	Alluvium	Trichloroethylene	12 µg/l
Main Plume 11th Ave to 17thAvenue			1,4 Dioxane	3.2 µg/l
Main Plume	Potentially Usable Quality	Alluvium	Trichloroethylene	12 µg/l
			1,4 Dioxane	3.2 µg/l
		Bedrock	Trichloroethylene	12 µg/l
			1,4 Dioxane	3.2 µg/l

DESCRIPTION - FIGURE 54A

Plume

A part of the Northeast Quarter of Section 8 and a part of the West Half of Section 9, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the West Quarter Corner of said Section 9;

thence North 00°10'10" East, along the west line of the Northwest Quarter of said Section 9, a distance of 37.00 feet;

thence South 89°49'04"East, parallel with the south line of said Northwest Quarter, a distance of 30.00

feet to the easterly line of Quebec Street and the Point of Beginning;

thence North 00°10'10" East, along said easterly line, a distance of 1,142.90 feet to a point of non-tangent curve; thence along the arc of a curve to the right having a radius of 3125.00 feet, a central angle of

4°44'39", an arc length of 258.75 feet and whose chord bears North 22°08'58" West a distance of 258.68

feet;

thence North 00°00'00" East a distance of 973.55 feet;

thence South 21°07'18" East a distance of 278.47 feet to a corner on the west line of Area 4 as described at Reception Number 9800174373 in the Clerk and Recorders Office of said City and County of Denver;

thence along the southwesterly line of said Area 4 the following seven (7) courses:

1. South 09°41'03" East a distance of 185.07 feet;

2. South 26°06'15" East a distance of 317.47 feet;

3. South 00°30'20" West a distance of 120.51 feet;

4. South 61°54'11" East a distance of 363.78 feet;

5. South 00°01'05" East a distance of 258.88 feet;

6. South 36°27'47" East a distance of 216.39 feet;

7. South 74°49'56" East a distance of 156.06 feet to the northwest corner of a parcel of land as described at Reception Number 2000013500 in said Clerk and Recorders Office;

thence South 36°28'38" East, along the southwesterly line of said parcel of land described at Reception Number 2000013500, a distance of 608.42 feet to a point on the northerly line of Area 2 as described at Reception Number 9800087078 in said Clerk and Recorders Office;

thence along said northerly line of Area 2 the following eight (8) courses:

1. South 53°32'18" West a distance of 744.29 feet;

2. North 35°20'40" West a distance of 74.00 feet to a point of non-tangent curvature;

3. along the arc of a curve to the right having a central angle of 35°31'36", a radius of 263.00 feet, an arc length of 163.08 feet and whose chord bears South 72°25'08" West a distance of 160.48 feet;

4. North 89°49'04" West a distance of 81.42 feet to a point of curvature;

5. along the arc of a curve to the right having a central angle of 20°15'00", a radius of 263.00 feet, an arc length of 92.95 feet and whose chord bears North 79°41'34" West a distance of 92.47 feet;

6. North 69°34'04" West a distance of 52.93 feet to a point of curvature;

7. along the arc of a curve to the left having a central angle of 20°15'00", a radius of 337.00 feet, an arc length of 119.11 feet and whose chord bears North 79°41'34" West a distance of 118.49 feet;

8. North 89°49'04" West a distance of 4.92 feet to the Point of Beginning;

Containing 1,279,711 square feet or 29.378 acres, more or less.

DESCRIPTION - FIGURE 54A

Main Plume On-Base

A part of the South Half of Section 4, a part of the Northeast Quarter of Section 9, and a part of the Northwest Quarter of Section 10, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the East Quarter Corner of said Section 4;

thence North 89°52'18" West, along the north line of the Southeast Quarter of said Section 4, a distance of 2370.92 feet;

thence South 00°07'42" West a distance of 30.00 feet to northerly line of Main TCE Plume-Groundwater within Parcel 4(A) described at Reception Number 2006011845 in the Clerk and Recorders Office of said

City and County of Denver being the Northeast corner of Lowry Filing No. 11 of said City and County of

Denver and the Point of Beginning;

thence along said northerly line and easterly line of said Main TCE Plume-Groundwater within Parcel 4(A) the following five (5) courses:

1. South 89°52'18" East a distance of 89.47 feet;

2. South 23°44'40" East a distance of 769.35 feet;

3. South 72°21'45" East a distance of 501.04 feet;

4. South 25°49'44" East a distance of 631.58 feet;

5. South 15°28'41" West a distance of 151.29 feet to a point of non-tangent curvature on the northerly line of a Parcel of Land described at Reception Number 2000137528 in said Clerk and Recorder's Office;

thence along said northerly line of a Parcel of Land described at Reception Number 2000137528 the following four (4) courses:

1. along the arc of a curve to the right having a central angle of 30°58'08", a radius of 712.50 feet, an arc length of 385.11 feet and whose chord bears North 87°23'44" East a distance of 380.44 feet;

2. South 06°32'39" East a distance of 34.74 feet;

3. South 89°50'19" East a distance of 35.51 feet to a point of non-tangent curvature;

4. along the arc of a curve to the left having a central angle of 43°39'25", a radius of 490.00 feet, an arc length of 373.36 feet and whose chord bears South 14°40'04" East a distance of 364.39 feet to the northwest corner of Main TCE Plume-Groundwater within Parcel 4(B) described at said Reception Number 2006011845;

thence along the northerly line, easterly line, southerly line and the westerly line of said Main TCE Plume-Groundwater within Parcel 4(B) the following twenty-six (26) courses:

1. South 36°29'47" East a distance of 128.17 feet;

2. South 90°00'00" East a distance of 155.49 feet;

3. South 36°29'47" East a distance of 704.82 feet;

4. South 57°31'52" East a distance of 703.51 feet;

5. North 53°24'05" East a distance of 68.43 feet;

6. South 64°33'43" East a distance of 156.02 feet;

7. South 53°27'42" West a distance of 58.01 feet;

8. South 36°17'24" East a distance of 381.43 feet;

9. South 17°56'49" East a distance of 238.64 feet;

10. South 32°44'51" East a distance of 356.26 feet;

11. South 67°06'32" East a distance of 309.90 feet;

12. North 82°51'23" East a distance of 511.06 feet;

13. South 38°32'02" East a distance of 355.36 feet;

14. North 55°13'32" East a distance of 139.45 feet to a point of non-tangent curve;

15. along the arc of a curve to the right having a central angle of 72°03'49", a radius of 380.00 feet, an arc length of 477.94 feet and whose chord bears South 07°29'33" West a distance of 447.06 feet;

16. South 43°31'28" West a distance of 549.19 feet to a point of curvature;

17. along the arc of a curve to the right having a central angle of 93°09'47", a radius of 150.00 feet, an arc length of 243.90 feet and whose chord bears North 89°53'39" West a distance of 217.91 feet;

18. North 43°18'45" West a distance of 343.85 feet;

19. North 40°43'41" West a distance of 761.58 feet;

20. North 35°04'31" West a distance of 417.42 feet;

21. North 39°16'25" West a distance of 600.98 feet;

22. South 53°24'05" West a distance of 58.18 feet;

23. North 43°35'10" West a distance of 146.09 feet;

24. North 52°26'55" West a distance of 623.56 feet;

25. North 41°13'02" West a distance of 75.00 feet;

26. North 45°55'58" West a distance of 470.27 feet to the southeast corner of a Parcel of Land described at Reception Number 2000137528 in said Clerk and Recorder's Office;

thence North 89°44'10" West, along the southerly line of said Parcel of Land described at Reception Number 2000137528, a distance of 433.18 feet; thence North 05°24'59" West a distance of 371.02 feet; thence South 70°19'10" West a distance of 434.55 feet; thence South 00°00'00" East a distance of 444.24 feet; thence North 88°55'43" East a distance of 464.42 feet;

thence North 05°24'59" West a distance of 12.49 feet to the easterly line of Main TCE Plume-Groundwater within Parcel 4(A) described at said Reception Number 2006011845;

thence along said easterly line, southerly line and the westerly line of said Main TCE Plume-Groundwater within Parcel 4(A) the following sixteen (16) courses:

1. South 89°44'10" East a distance of 134.18 feet;

2. South 00°04'42" West a distance of 502.15 feet;

3. North 89°44'58" West a distance of 431.06 feet;

4. North 00°19'49" West a distance of 130.06 feet;

5. North 89°57'23" West a distance of 91.72 feet;

6. North 00°00'00" West a distance of 87.47 feet;

7. North 50°16'15" West a distance of 238.52 feet;

8. North 40°45'51" West a distance of 165.09 feet;

9. North 03°40'12" West a distance of 150.35 feet;

10. North 19°29'51" East a distance of 132.64 feet;

11. North 24°50'04" West a distance of 162.56 feet;

12. North 89°36'09" West a distance of 210.32 feet;

13. North 00°28'46" East a distance of 12.84 feet to a point of curvature;

14. along the arc of a curve to the left having a central angle of 08°45'59", a radius of 734.75 feet, an arc length of 112.42 feet and whose chord bears North 03°54'13" West a distance of 112.31 feet;

15. North 06°12'02" West a distance of 630.98 feet;

16. North 06°12'02" West a distance of 238.38 feet to the most southerly corner of Main TCE Plume-Groundwater within Parcel 1 described at said Reception Number 2006011845;

thence along the westerly line and northerly line of said Main TCE Plume-Groundwater within Parcel 1 the following nine (9) courses:

1. North 41°30'47" West a distance of 553.53 feet;

2. North 12°41'48" West a distance of 49.74 feet to a point of non-tangent curvature;

3. along the arc of a curve to the right having a central angle of 1°09'17", a radius of 530.00 feet, an arc length of 10.68 feet and whose chord bears North 48°46'25" East a distance of 10.68 feet;

4. North 41°46'02" West a distance of 46.17 feet;

5. North 14°53'14" West a distance of 187.00 feet to a point of curvature;

6. along the arc of a curve to the left having a central angle of 53°13'20", a radius of 330.00 feet, an arc length of 306.54 feet and whose chord bears North 41°29'54" West a distance of 295.64 feet;

7. North 68°06'34" West a distance of 64.74 feet to a point of curvature;

8. along the arc of a curve to the right having a central angle of 71°39'12", a radius of 380.00 feet, an arc length of 475.22 feet and whose chord bears North 32°16'58" West a distance of 444.85 feet;

9. South 89°52'56" East a distance of 506.86 feet to the most westerly corner of Main TCE Plume-Groundwater within Parcel 4(A) described at said Reception Number 2006011845;

thence along the westerly line and northerly line of said Main TCE Plume-Groundwater within Parcel 1 the following two (2) courses:

1. South 89°52'56" East a distance of 6.99 feet;

2. South 89°52'18" East a distance of 268.42 feet to the Point of Beginning;

Containing 4,926,271 square feet or 113.092 acres, more or less.

DESCRIPTION - FIGURE 54A

1432 Source Area

A part of the Southeast Quarter of Section 4 and a part of the Northeast Quarter of Section 9, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the South Quarter Corner of said Section 4;

thence South 82°44'48"East, a distance of 1012.91 feet to the Point of Beginning;

thence North 00°00'00" East a distance of 444.24 feet;

thence North 70°19'10" East a distance of 434.55 feet;

thence South 05°24'59" East a distance of 584.51 feet;

thence South 88°55'43" West a distance of 464.42 feet to the Point of Beginning;

Containing 226,222 square feet or 5.193 acres, more or less.

DESCRIPTION - FIGURE 54A

Plume Off-Base North of 17th Ave.

A part of the Southwest Quarter of Section 28, a part of the Southeast Quarter of Section 29, a part of the Northeast Quarter of Section 32 and a part of Section 33, Township 3 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado, more particularly described as follows:

Commencing at the South Quarter Corner of said Section 33;

thence North 31°22'38" East a distance of 1552.30 feet to a point 1325.00 feet north of the south line of the Southeast Quarter of said Section 33 and the Point of Beginning;

thence South 89°58'46" West, parallel with and 1325.00 feet north of said south line of the Southeast

Quarter of Section 33, a distance of 1187.41 feet;

thence North 09°46'56" West a distance of 335.67 feet to a point of curve;

thence along the arc of a curve to the left having a radius of 2900.00 feet, a central angle of 30°17'20", an arc length of 1533.06 feet and whose chord bears North 24°55'36" West a distance of 1515.27 feet;

thence North 40°04'16" West a distance of 792.77 feet;

thence North 41°38'26" West a distance of 972.28 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 2500.00 feet, a central angle of 22°50'51",

an arc length of 996.92 feet and whose chord bears North 30°13'00" West a distance of 990.32 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 1300.00 feet, a central angle of 33°47'26",

an arc length of 766.68 feet and whose chord bears North 01°53'52" West a distance of 755.62 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 350.00 feet, a central angle of 18°07'24", an arc length of 110.71 feet and whose chord bears North 24°03'33" East a distance of 110.25 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 270.00 feet, a central angle of 67°42'57", an arc length of 319.10 feet and whose chord bears North 66°58'43" East a distance of 300.85 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 575.00 feet, a central angle of 20°48'09", an arc length of 208.77 feet and whose chord bears South 71°31'48" East a distance of 207.62 feet;

thence South 61°07'44" East a distance of 184.24 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 3000.00 feet, a central angle of 15°24'06",

an arc length of 806.43 feet and whose chord bears South 53°25'41" East a distance of 804.01 feet;

thence South 45°43'38" East a distance of 1161.69 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 3665.00 feet, a central angle of 29°14'21",

an arc length of 1870.32 feet and whose chord bears South 31°06'28" East a distance of 1850.09 feet;

thence South 16°29'17" East a distance of 850.36 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 6000.00 feet, a central angle of 9°58'50", an arc length of 1045.16 feet and whose chord bears South 11°29'52" East a distance of 1043.84 feet to the

Point of Beginning.

Containing 7,201,575 square feet or 165.325 acres, more or less.

DESCRIPTION - FIGURE 54A

Main Plume Off-Base 11th to 17th Ave.

A part of Section 4 and a part of the South Half of Section 33, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado, more particularly described as follows:

Commencing at the North Quarter corner of said Section 4;

thence North 31°22'38" East a distance of 1552.30 feet to a point 1325.00 feet north of the north line of said Northeast Quarter of Section 4 and the Point of Beginning;

thence along the arc of a curve to the right having a radius of 6000.00 feet, a central angle of 2°47'10", an arc length of 291.77 feet and whose chord bears South 5°06'52" East a distance of 291.74 feet;

thence South 03°43'17" East a distance of 800.48 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 4500.00 feet, a central angle of 19°27'27",

an arc length of 1528.19 feet and whose chord bears South 06°00'27" West a distance of 1520.86 feet;

thence South 15°44'10" West a distance of 294.78 feet;

thence South 17°45'05" West a distance of 639.10 feet to a point of curve;

thence along the arc of a curve to the left having a radius of 1200.00 feet, a central angle of 25°03'48", an arc length of 524.93 feet and whose chord bears South 05°13'11" West a distance of 520.75 feet;

thence North 89°52'18" West, parallel with and 30.00 feet south of the south line of said Northeast

Quarter of Section 4, a distance of 419.51 feet;

thence North 89°52'56" West, parallel with and 30.00 feet south of the south line of the Northwest Quarter of said Section 4, a distance of 450.35 feet;

thence North 30°49'24" West a distance of 463.33 feet;

thence along the arc of a curve to the right having a radius of 1500.00 feet, a central angle of 14°30'57",

an arc length of 380.03 feet and whose chord bears North 23°33'55" West a distance of 379.01 feet;

thence North 16°18'26" West a distance of 512.11 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 300.00 feet, a central angle of 28°46'36", an arc length of 150.67 feet and whose chord bears North 01°55'08" West a distance of 149.10 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 105.00 feet, a central angle of 131°07'49",

an arc length of 240.31 feet and whose chord bears North 78°02'04" East a distance of 191.19 feet;

thence South 36°24'02" East a distance of 347.82 feet;

thence South 32°39'29" East a distance of 250.06 feet to a point of curve;

thence along the arc of a curve to the left having a radius of 215.00 feet, a central angle of 65°16'55", an arc length of 244.97 feet and whose chord bears South 65°17'57" East a distance of 231.93 feet;

thence North 82°03'36" East a distance of 35.54 feet;

thence along the arc of a curve to the left having a radius of 200.00 feet, a central angle of 69°29'20", an arc length of 242.56 feet and whose chord bears North 47°18'55" East a distance of 227.97 feet;

thence North 12°34'15" East a distance of 8.49 feet to a point of curve;

thence along the arc of a curve to the left having a radius of 2150.00 feet, a central angle of 20°16'07", an arc length of 760.57 feet and whose chord bears North 02°26'12" East a distance of 756.61 feet;

thence North 07°41'52" West a distance of 958.60 feet;

thence North 09°46'56" West a distance of 1318.05 feet;

thence North 89°58'46" East, parallel with and 1325.00 feet north of said north line of the Northeast

Quarter of Section 4, a distance of 1187.41 feet to the Point of Beginning.

Containing 4,221,670 square feet or 96.916 acres, more or less.

DESCRIPTION - FIGURE 54B

HQ Plume

A part of the West Half of Section 9, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the West Quarter Corner of said Section 9;

thence North 00°10'10" East, along the west line of the Northwest Quarter of said Section 9, a distance of 37.00 feet;

thence South 89°49'04"East, parallel with the south line of said Northwest Quarter, a distance of 30.00

feet to the easterly line of Quebec Street and the Point of Beginning;

thence North 00°10'10" East, along said easterly line, a distance of 2,096.27 feet to a corner on the west line of Area 4 as described at Reception Number 9800174373 in the Clerk and Recorders Office of said City and County of Denver;

thence along the southwesterly line of said Area 4 the following seven (7) courses:

1. South 09°41'03" East a distance of 185.07 feet;

2. South 26°06'15" East a distance of 317.47 feet;

3. South 00°30'20" West a distance of 120.51 feet;

4. South 61°54'11" East a distance of 363.78 feet;

5. South 00°01'05" East a distance of 258.88 feet;

6. South 36°27'47" East a distance of 216.39 feet;

7. South 74°49'56" East a distance of 156.06 feet to the northwest corner of Area 9 as described at Reception Number 2000013500 in said Clerk and Recorders Office;

thence South 36°28'38" East, along the southwesterly line of said Area 9, a distance of 608.42 feet to a point on the northerly line of Area 2 as described at Reception Number 9800087078 in said Clerk and Recorders Office;

thence along said northerly line the following eight (8) courses:

1. South 53°32'18" West a distance of 744.29 feet;

2. North 35°20'40" West a distance of 74.00 feet to a point of non-tangent curvature;

4. North 89°49'04" West a distance of 81.42 feet to a point of curvature;

6. North 69°34'04" West a distance of 52.93 feet to a point of curvature;

8. North 89°49'04" West a distance of 4.92 feet to the Point of Beginning;

Containing 1,183,575 square feet or 27.171 acres, more or less.

DESCRIPTION - FIGURE 54B

FTZ Plume (North)

A part of the Southeast Quarter of Section 10, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado, more particularly described as follows:

Commencing at the East Quarter Corner of said Section 10;

thence South 87°25'19" West a distance of 1374.75 feet to a point 50.00 feet west of the east line of the

Northwest Quarter of said Southeast Quarter of Section 10 and the Point of Beginning;

Thence South 00°06'26'' West, parallel with and 50.00 west of said east line, a distance of 300.00 feet; thence North 89°53'34" West a distance of 275.00 feet; thence North 00°06'26" East a distance of 300.00 feet;

thence South 89°53'34" East a distance of 275.00 feet to the Point of Beginning.

Containing 82,500 square feet or 1.894 acres, more or less.

DESCRIPTION - FIGURE 54B

FTZ Plume (South)

A part of the Southeast Quarter of Section 10, Township 4 South, Range 67 West of the Sixth Principal Meridian, City of Aurora, County of Arapahoe, State of Colorado, more particularly described as follows:

Commencing at the East Quarter Corner of said Section 10;

thence South 49°32'32" West a distance of 1583.91 feet to the Point of Beginning;

thence South 89°53'34" East a distance of 225.00 feet;

thence South 00°06'26" West a distance of 225.00 feet;

thence North 89°53'34" West a distance of 225.00 feet;

thence North 00°06'26" East a distance of 225.00 feet to the Point of Beginning.

Containing 50,625 square feet or 1.162 acres, more or less.

DESCRIPTION - FIGURE 54B

OFR Source Area

A part of the Northwest Quarter of Section 10, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the Northwest Corner of said Section 10;

thence South 42°12'35" East a distance of 1714.55 feet to the intersection of the centerline of 5^th Avenue and the easterly line of Main TCE Plume-Groundwater within Parcel 4(B) described at Reception Number 2006011845 in the Clerk and Recorders Office of said City and County of Denver and the Point of

Beginning;

thence along said easterly line and southerly line of said Main TCE Plume-Groundwater within Parcel

4(B) the following ten (10) courses:

1. South 67°06'32" East a distance of 307.11 feet;

2. North 82°51'23" East a distance of 511.06 feet;

3. South 38°32'02" East a distance of 355.36 feet;

4. North 55°13'32" East a distance of 139.45 feet;

5. along the arc of a curve to the right having a central angle of 72°03'49", a radius of 380.00 feet, an arc length of 477.94 feet and whose chord bears South 07°29'33" West a distance of 447.06 feet;

6. South 43°31'28" West a distance of 549.19 feet to a point of curvature;

7. along the arc of a curve to the right having a central angle of 93°09'47", a radius of 150.00 feet, an arc length of 243.90 feet and whose chord bears North 89°53'39" West a distance of 217.91 feet;

8. North 43°18'45" West a distance of 343.85 feet;

9. North 40°43'41" West a distance of 761.58 feet;

10. North 35°04'31" West a distance of 59.86 feet to said centerline of 5^th Avenue;

thence North 53°27'42" East, along said centerline, a distance of 367.97 feet to the Point of Beginning;

Containing 978,055 square feet or 22.453 acres, more or less.

DESCRIPTION - FIGURE 54B

Main Plume On-Base

Commencing at the East Quarter Corner of said Section 4;

thence North 89°52'18" West, along the north line of the Southeast Quarter of said Section 4, a distance of 2370.92 feet;

City and County of Denver being the Northeast corner of Lowry Filing No. 11 of said City and County of

Denver and the Point of Beginning;

thence along said northerly line and easterly line of said Main TCE Plume-Groundwater within Parcel 4(A) the following five (5) courses:

1. South 89°52'18" East a distance of 89.47 feet;

2. South 23°44'40" East a distance of 769.35 feet;

3. South 72°21'45" East a distance of 501.04 feet;

4. South 25°49'44" East a distance of 631.58 feet;

thence along said northerly line of a Parcel of Land described at Reception Number 2000137528 the following four (4) courses:

2. South 06°32'39" East a distance of 34.74 feet;

3. South 89°50'19" East a distance of 35.51 feet to a point of non-tangent curvature;

thence along the northerly line, easterly line, southerly line and the westerly line of said Main TCE Plume-Groundwater within Parcel 4(B) the following twenty-six (26) courses:

1. South 36°29'47" East a distance of 128.17 feet;

2. South 90°00'00" East a distance of 155.49 feet;

3. South 36°29'47" East a distance of 704.82 feet;

4. South 57°31'52" East a distance of 703.51 feet;

5. North 53°24'05" East a distance of 68.43 feet;

6. South 64°33'43" East a distance of 156.02 feet;

7. South 53°27'42" West a distance of 58.01 feet;

8. South 36°17'24" East a distance of 381.43 feet;

9. South 17°56'49" East a distance of 238.64 feet;

10. South 32°44'51" East a distance of 356.26 feet;

11. South 67°06'32" East a distance of 309.90 feet;

12. North 82°51'23" East a distance of 511.06 feet;

13. South 38°32'02" East a distance of 355.36 feet;

14. North 55°13'32" East a distance of 139.45 feet to a point of non-tangent curve;

16. South 43°31'28" West a distance of 549.19 feet to a point of curvature;

18. North 43°18'45" West a distance of 343.85 feet;

19. North 40°43'41" West a distance of 761.58 feet;

20. North 35°04'31" West a distance of 417.42 feet;

21. North 39°16'25" West a distance of 600.98 feet;

22. South 53°24'05" West a distance of 58.18 feet;

23. North 43°35'10" West a distance of 146.09 feet;

24. North 52°26'55" West a distance of 623.56 feet;

25. North 41°13'02" West a distance of 75.00 feet;

26. North 45°55'58" West a distance of 470.27 feet to the southeast corner of a Parcel of Land described at Reception Number 2000137528 in said Clerk and Recorder's Office;

thence North 05°24'59" West a distance of 12.49 feet to the easterly line of Main TCE Plume-Groundwater within Parcel 4(A) described at said Reception Number 2006011845;

thence along said easterly line, southerly line and the westerly line of said Main TCE Plume-Groundwater within Parcel 4(A) the following sixteen (16) courses:

1. South 89°44'10" East a distance of 134.18 feet;

2. South 00°04'42" West a distance of 502.15 feet;

3. North 89°44'58" West a distance of 431.06 feet;

4. North 00°19'49" West a distance of 130.06 feet;

5. North 89°57'23" West a distance of 91.72 feet;

6. North 00°00'00" West a distance of 87.47 feet;

7. North 50°16'15" West a distance of 238.52 feet;

8. North 40°45'51" West a distance of 165.09 feet;

9. North 03°40'12" West a distance of 150.35 feet;

10. North 19°29'51" East a distance of 132.64 feet;

11. North 24°50'04" West a distance of 162.56 feet;

12. North 89°36'09" West a distance of 210.32 feet;

13. North 00°28'46" East a distance of 12.84 feet to a point of curvature;

15. North 06°12'02" West a distance of 630.98 feet;

16. North 06°12'02" West a distance of 238.38 feet to the most southerly corner of Main TCE Plume-Groundwater within Parcel 1 described at said Reception Number 2006011845;

thence along the westerly line and northerly line of said Main TCE Plume-Groundwater within Parcel 1 the following nine (9) courses:

1. North 41°30'47" West a distance of 553.53 feet;

2. North 12°41'48" West a distance of 49.74 feet to a point of non-tangent curvature;

4. North 41°46'02" West a distance of 46.17 feet;

5. North 14°53'14" West a distance of 187.00 feet to a point of curvature;

7. North 68°06'34" West a distance of 64.74 feet to a point of curvature;

8 along the arc of a curve to the right having a central angle of 71°39'12", a radius of 380.00 feet,

an arc length of 475.22 feet and whose chord bears North 32°16'58" West a distance of 444.85 feet;

9. South 89°52'56" East a distance of 506.86 feet to the most westerly corner of Main TCE Plume-Groundwater within Parcel 4(A) described at said Reception Number 2006011845;

thence along the westerly line and northerly line of said Main TCE Plume-Groundwater within Parcel 1 the following two (2) courses:

1. South 89°52'56" East a distance of 6.99 feet;

2. South 89°52'18" East a distance of 268.42 feet to the Point of Beginning;

Containing 4,926,271 square feet or 113.092 acres, more or less.

Excepting therefrom (CT Source Area):

A part of the Southeast Quarter of Section 4, Township 4 South, Range 67 West of the Sixth Principal Meridian, City and County of Denver, State of Colorado being more particularly described as follows:

Commencing at the South Quarter Corner of said Section 4;

thence North 40°32'20" East, a distance of 1211.63 feet to the Point of Beginning;

thence North 04°07'47" West a distance of 635.58 feet;

thence North 88°59'02" East a distance of 303.02 feet;

thence South 03°29'14" East a distance of 638.04 feet;

thence South 89°31'37" West a distance of 296.02 feet to the Point of Beginning;

Containing 190,459 square feet or 4.372 acres, more or less.

Excepting therefrom (OFR Source Area):

Commencing at the Northwest Corner of said Section 10;

thence along said easterly line and southerly line of said Main TCE Plume-Groundwater within Parcel 4(B) the following ten (10) courses:

1. South 67°06'32" East a distance of 307.11 feet;

2. North 82°51'23" East a distance of 511.06 feet;

3. South 38°32'02" East a distance of 355.36 feet;

4. North 55°13'32" East a distance of 139.45 feet;

6. South 43°31'28" West a distance of 549.19 feet to a point of curvature;

8. North 43°18'45" West a distance of 343.85 feet;

9. North 40°43'41" West a distance of 761.58 feet;

10. North 35°04'31" West a distance of 59.86 feet to said centerline of 5^th Avenue;

thence North 53°27'42" East, along said centerline, a distance of 367.97 feet to the Point of Beginning;

Containing 978,055 square feet or 22.453 acres, more or less.

Resulting Area contains 3,757,757 square feet or 86.267 acres, more or less.

DESCRIPTION - FIGURE 54B

1432 Source Area

Commencing at the South Quarter Corner of said Section 4;

thence South 82°44'48"East, a distance of 1012.91 feet to the Point of Beginning;

thence North 00°00'00" East a distance of 444.24 feet; thence North 70°19'10" East a distance of 434.55 feet; thence South 05°24'59" East a distance of 584.51 feet; thence South 88°55'43" West a distance of 464.42 feet to the Point of Beginning;

Containing 226,222 square feet or 5.193 acres, more or less.

DESCRIPTION - FIGURE 54B

Source Area

Commencing at the South Quarter Corner of said Section 4;

thence North 40°32'20" East, a distance of 1211.63 feet to the Point of Beginning;

thence North 04°07'47" West a distance of 635.58 feet; thence North 88°59'02" East a distance of 303.02 feet; thence South 03°29'14" East a distance of 638.04 feet;

thence South 89°31'37" West a distance of 296.02 feet to the Point of Beginning;

Containing 190,459 square feet or 4.372 acres, more or less.

DESCRIPTION - FIGURE 54B

Main Plume Off-Base

(Main Plume Off-Base North of 17th Ave.):

Commencing at the South Quarter Corner of said Section 33;

thence North 31°22'38" East a distance of 1552.30 feet to a point 1325.00 feet north of the south line of the Southeast Quarter of said Section 33 and the Point of Beginning;

thence South 89°58'46" West, parallel with and 1325.00 feet north of said south line of the Southeast

Quarter of Section 33, a distance of 1187.41 feet;

thence North 09°46'56" West a distance of 335.67 feet to a point of curve;

thence North 40°04'16" West a distance of 792.77 feet;

thence North 41°38'26" West a distance of 972.28 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 2500.00 feet, a central angle of 22°50'51",

an arc length of 996.92 feet and whose chord bears North 30°13'00" West a distance of 990.32 feet to a point of compound curve;

thence along the arc of a curve to the right having a radius of 1300.00 feet, a central angle of 33°47'26",

an arc length of 766.68 feet and whose chord bears North 01°53'52" West a distance of 755.62 feet to a point of compound curve;

thence South 61°07'44" East a distance of 184.24 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 3000.00 feet, a central angle of 15°24'06",

an arc length of 806.43 feet and whose chord bears South 53°25'41" East a distance of 804.01 feet;

thence South 45°43'38" East a distance of 1161.69 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 3665.00 feet, a central angle of 29°14'21",

an arc length of 1870.32 feet and whose chord bears South 31°06'28" East a distance of 1850.09 feet;

thence South 16°29'17" East a distance of 850.36 feet to a point of curve;

Point of Beginning.

Containing 7,201,575 square feet or 165.325 acres, more or less.

Together with (Main Plume Off-Base 11th to 17th Ave.):

Commencing at the North Quarter corner of said Section 4;

thence North 31°22'38" East a distance of 1552.30 feet to a point 1325.00 feet north of the north line of said Northeast Quarter of Section 4 and the Point of Beginning;

thence South 03°43'17" East a distance of 800.48 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 4500.00 feet, a central angle of 19°27'27",

an arc length of 1528.19 feet and whose chord bears South 06°00'27" West a distance of 1520.86 feet;

thence South 15°44'10" West a distance of 294.78 feet;

thence South 17°45'05" West a distance of 639.10 feet to a point of curve;

thence North 89°52'18" West, parallel with and 30.00 feet south of the south line of said Northeast

Quarter of Section 4, a distance of 419.51 feet;

thence North 89°52'56" West, parallel with and 30.00 feet south of the south line of the Northwest Quarter of said Section 4, a distance of 450.35 feet;

thence North 30°49'24" West a distance of 463.33 feet;

thence along the arc of a curve to the right having a radius of 1500.00 feet, a central angle of 14°30'57",

an arc length of 380.03 feet and whose chord bears North 23°33'55" West a distance of 379.01 feet;

thence North 16°18'26" West a distance of 512.11 feet to a point of curve;

thence along the arc of a curve to the right having a radius of 105.00 feet, a central angle of 131°07'49",

an arc length of 240.31 feet and whose chord bears North 78°02'04" East a distance of 191.19 feet;

thence South 36°24'02" East a distance of 347.82 feet;

thence South 32°39'29" East a distance of 250.06 feet to a point of curve;

thence North 82°03'36" East a distance of 35.54 feet;

thence North 12°34'15" East a distance of 8.49 feet to a point of curve;

thence North 07°41'52" West a distance of 958.60 feet;

thence North 09°46'56" West a distance of 1318.05 feet;

thence North 89°58'46" East, parallel with and 1325.00 feet north of said north line of the Northeast

Quarter of Section 4, a distance of 1187.41 feet to the Point of Beginning.

Containing 4,221,670 square feet or 96.916 acres, more or less.

Total Area contains 11,434,245 square feet or 262.241 acres, more or less.

(55)OIL AND GAS FIELDS OF LARIMER, WELD, BOULDER, BROOMFIELD, ADAMS, DENVER, JEFFERSON, AND ARAPAHOE COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the Admire, Amazon, Council Grove, Missouri, Atoka, Blaine, D Sand, Dakota, Denver Basin Combined Disposal Zone, Entrada, J Sand, and Lyons Formations underlying the area within one mile of the following points expressed in latitudes and longitudes. These areas are included in Figure 55 on page 111.

Latitude/ Longitude	Latitude/ Longitude	Latitude/ Longitude
39.60821, -104.18232	40.20999, -104.71662	40.61325, -104.035203
39.620692, -104.325724	40.21683, -104.71985	40.61353, -104.137548
39.75233, -104.03303	40.2202, -104.34536	40.63478, -104.109167
39.77477, -103.9422	40.23112, -104.5949	40.63974, -104.06681
39.80714, -104.12067	40.28085, -104.69488	40.6398, -104.05071
39.84491, -104.42586	40.28776, -104.67896	40.6938, -103.8507
39.869842, -103.745884	40.28409, -104.73756	40.724926, -104.289846
39.88509, -104.36927	40.29801, -104.7498	40.74838, -103.99015
39.89082, -104.70847	40.320297, -104.566164	40.76933, -104.21866
40.01614, -104.89757	40.31398, -104.56534	40.80769, -103.82983
40.016564, -104.887081	40.32083, -104.5664	40.81804, -103.79409
40.02249, -104.90311	40.36575, -104.18842	40.82061, -104.16246
40.025055, -104.816566	40.36876, -104.41587	40.8265, -104.14517
40.10297, -104.5828	40.37589, -104.6125	40.83597, -104.16035
40.10854, -104.56555	40.4383, -104.628	40.89365, -104.34575
40.11794, -104.60543	40.47566, -104.17332	40.89393, -104.33553
40.125494, -104.883309	40.4897, -104.47285	40.9556, -104.36213
40.119597, -104.865566	40.5298, -104.41358	40.96828, -103.661653
40.124017, -104.902692	40.52414, -104.41672	40.976305, -103.661501
40.13705, -104.47264	40.52514, -104.62801	40.979434, -103.656559
40.126612, -104.464245	40.53558, -104.62365	40.97972, -103.66626
40.13947, -104.46355	40.59307, -104.528182	40.982843, -103.661408
40.19162, -104.71281	40.60263, -104.02873
40.19204, -104.69897	40.60989, -104.03454

(b)Classifications: The classification of the groundwater in these formations is:

- Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(56)OIL AND GAS FIELDS OF MORGAN, LOGAN, SEDGWICK, PHILLIPS, WASHINGTON, AND YUMA COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the D Sand, Dakota, Fountain, J Sand, J-3 Sand, Lakota, Lower Satanka, Morrison, Lansing, Kansas City, Lyons, Marmaton, Morrison, Niobrara, Regan, Virgil, and Wolf Camp formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 56 on page 112.

Latitude/ Longitude	Latitude/ Longitude	Latitude/ Longitude
39.58185, -103.38546	39.888925, -102.865565	40.11932, -104.08688
39.59581, -103.37951	39.90152, -102.4707	40.13644, -103.16763
39.6681, -102.165723	39.91919, -102.22375	40.1381, -102.84531
39.673339, -102.233444	39.929391, -102.314463	40.15598, -103.36565
39.67957, -102.28272	39.976429, -102.354501	40.18258, -103.82077
39.704642, -103.361011	40.00713, -103.290579	40.18601, -103.16911
39.713938, -102.209939	40.01565, -102.43764	40.195, -103.82225
39.715231, -102.2426	40.01609, -102.52394	40.19719, -103.20139
39.777627, -103.43058	40.022996, -102.175297	40.22283, -103.10571
39.79748, -103.2155	40.02669, -102.37825	40.22688, -102.35798
39.802816, -103.054906	40.0402, -103.38469	40.22797, -103.5493
39.809616, -102.922843	40.05836, -103.3842	40.23354, -102.21216
39.810767, -102.930527	40.066971, -102.400034	40.25355, -102.60833
39.813579, -102.941694	40.07338, -102.32035	40.25567, -102.45912
39.81592, -102.93014	40.07355, -102.56954	40.26883, -102.42858
39.81804, -102.48914	40.10294, -103.32376	40.29036, -102.61721
40.317923, -102.455947	40.44019, -102.35947	40.74218, -102.13088
40.37238, -102.51082	40.55598, -102.32208	40.96291, -102.54341
40.381154, -102.274502	40.6709, -102.1946

(b)Classifications: The classification of the groundwater in these Formations is:

- Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(57)OIL AND GAS FIELDS OF DOUGLAS, ELBERT, LINCOLN, KIT CARSON, EL PASO, CHEYENNE, PUBELO, FREMONT, CROWLEY, KIOWA, OTERO, BENT, PROWERS, AND BACA COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the Arbuckle, Atoka, Ceder Hills, Cherokee, J Sand, Keyes, Lansing, Kansas City, Lyons, Marmaton, Mississippian, Morrow, Osage, Simpson, Spergen, Topeka, Wabaunsee, Warsaw, and St Joe Formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 57 on page 113.

Latitude/ Longitude	Latitude/ Longitude	Latitude/ Longitude
37.114207, -102.182279	38.60726, -102.7447	38.9406, -102.17244
37.114207, -102.182636	38.66704, -102.50777	38.9411, -102.17841
37.156613, -102.279001	38.681802, -102.413502	38.9645, -102.50232
38.36436, -102.31397	38.72459, -102.53347	39.0107, -103.23166
38.41314, -102.47106	38.76729, -102.39513	39.0217, -103.27255
38.413637, -102.443583	38.78962, -102.38061	39.0218, -103.27713
38.417051, -102.439426	38.82221, -102.064959	39.09372, -102.52811
38.427871, -103.017976	38.85892, -103.56356	39.15871, -103.5777
38.43131, -102.48017	38.86533, -102.36805	39.16983, -102.4435
38.449529, -102.425447	38.87939, -102.33112	39.16994, -103.3729
38.457213, -102.425389	38.884398, -102.073721	39.17317, -103.58226
38.464, -102.67829	38.89058, -102.30781	39.20963, -103.62828
38.51632, -102.076454	38.89525, -102.25985	39.249543, -103.712168
38.518887, -102.094684	38.92804, -102.18186	39.52291, -103.41915
38.52907, -102.44091	38.93033, -103.41655	39.5274, -103.41428
38.59824, -102.74739	38.9354, -102.17292	39.53389, -103.4189
38.60723, -102.73716

(b)Classifications: The classification of the groundwater in these Formations is: - Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(58)OIL AND GAS FIELDS OF SAUGUACHE, RIO GRANDE, ALAMOSA, HUERFANO, COSTILLA, AND LAS ANIMAS COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the Apishapa, Dakota, Dockum, Entrada,

Purgatorie, and Dockus Formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 58 on page 114.

Latitude/ Longitude	Latitude/ Longitude
37.02281, -104.83255	37.16013, -104.79724
37.0233, -104.78275	37.19594, -104.67421
37.0687, -104.92571	37.20633, -104.898526
37.09282, -104.73615	37.21621, -104.78017
37.09594, -104.61552	37.22741, -104.69844
37.1031, -104.98617	37.25324, -104.66298
37.112446, -104.337833	37.25924, -104.92553
37.11612, -104.68325	37.29085, -104.82886
37.13313, -104.69708	37.29984, -104.72925
37.15063, -104.85969	37.30479, -104.78297

(b)Classifications: The classification of the groundwater in these Formations is: - Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(59)OIL AND GAS FIELDS OF LA PLATA AND ARCHULETA COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the Bluff Sandstone, Entrada, Burro Canyon, Cliff House, Dakota, Morrison, Fruitland Coal, Lewis Shale, Pictured Cliffs, and Point Lookout Formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 59 on page 115.

Latitude/ Longitude	Latitude/ Longitude
37.21553, -107.630964 *	37.253829, -107.802101
37.215631, -107.631485 *	37.261693, -107.799793
37.217134, -107.565823 *	37.264746, -107.561634
37.23028, -107.75666	37.273754, -107.608827
37.23455, -107.74417

* This 1-mile buffer will end at the external boundary of the Reservation.

(b)Classifications: The classification of the groundwater in these formations is: - Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(60)OIL AND GAS FIELDS OF MONTROSE, SAN MIGUEL, DOLORES, AND MONTEZUMA COUNTIES, COLORADO

(a)Specified Area: The confined groundwater within the Cambrian, Cutler, Desert Creek, Ismay, and Leadville Formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 60 on page 116.

Latitude/ Longitude	Latitude/ Longitude	Latitude/ Longitude
37.241989, -109.020183 *	37.46546, -108.92843	37.52239, -108.93618
37.5553535, -108.95168	37.58575, -109.00764	38.0364, -108.62491

* This 1-mile buffer will end at the external boundary of the Reservation.

(b)Classifications: The classification of the groundwater in these Formations is: - Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

(61)OIL AND GAS FIELDS OF MOFFAT, ROUTT, JACKSON, GRAND, RIO BLANCO, GARFIELD, MESA, DELTA, PITKIN, AND GUNNISON COUNTIES, COLORADO

(a) Specified Area: The confined groundwater within the Cameo Coal, Castlegate, Corcoran, Cozzette, Dakota, Douglas Creek, Entrada, Fort Union, Iles, Lance, Loyd Sandstone, Mancos, Maroon, Morapos, Morrison, Navajo, Niobrara, Ohio Creek, Sego, Sundance, Wasatch, Weber, and Williams Fork Formations underlying the area within one mile of the following latitudes and longitudes. These areas are included in Figure 61 on page 117.

Latitude/ Longitude	Latitude/ Longitude	Latitude/ Longitude
38.997745, -107.850925	39.36598, -107.73434	39.47566, -108.18025
39.017605, -107.379825	39.375194, -107.559121	39.4764, -108.17452
39.027911, -107.509919	39.38204, -108.02058	39.47702, -108.06074
39.08221, -107.40345	39.389471, -108.25443	39.47921, -108.06392
39.19544, -107.904	39.38785, -108.13076	39.48072, -107.63154
39.20637, -107.9174	39.38858, -108.14059	39.48859, -107.72164
39.230342, -108.17023	39.39361, -108.1349	39.49066, -107.60821
39.233839, -107.765692	39.40084, -108.13592	39.489332, -108.248598
39.26777, -107.759	39.39898, -108.07479	39.48956, -107.60024
39.277951, -108.206462	39.40368, -108.07467	39.49461, -107.67849
39.28535, -107.844	39.420635, -108.059997	39.49929, -107.97868
39.29646, -107.7269	39.43221, -108.06941	39.49811, -107.98879
39.31355, -108.93205	39.43327, -108.02356	39.498003, -108.016328
39.32072, -108.12222	39.4588, -107.90689	39.49852, -107.967375
39.337666, -108.116958	39.45583, -108.01659	39.50093, -107.89808
39.35571, -108.13613	39.46009, -107.541335	39.50627, -107.89517
39.364576, -108.388351	39.46365, -108.05303	39.50824, -107.55925
39.37115, -107.72924	39.46689, -108.06313	39.5083, -107.89583
39.37669, -107.7351	39.474883, -108.065923	39.509646, -107.893854
39.51098, -108.17116	39.61227, -108.14792	39.66879, -108.10186
39.51026, -107.92889	39.62014, -108.42332	39.67184, -108.08907
39.52764, -107.63952	39.62323, -108.40503	39.67459, -108.10179
39.53227, -107.65582	39.621725, -108.414186	39.6777, -108.08909
39.54794, -107.56697	39.62648, -108.42167	39.675797, -108.138626
39.54649, -108.2305	39.6313, -108.41366	39.67992, -108.14867
39.5551, -108.23276	39.63507, -108.4283	39.69138, -108.08901
39.5793, -108.18659	39.63477, -108.41406	39.68406, -108.08913
39.61243, -108.15259	39.63477, -108.41406	39.68039, -108.10184
39.693136, -108.098823	39.72736, -109.04148	39.815622, -108.76257
39.72317, -109.02753	39.785069, -108.240815	39.828981, -108.85607
39.72349, -109.0314	39.79422, -108.27772	39.8465, -108.23279
39.84741, -108.47646	39.87843, -108.18786	39.8922, -108.25077
39.84935, -108.48774	39.88416, -108.19091	39.89429, -108.2247
39.852514, -108.494244	39.88453, -108.18307	39.89473, -108.20599
39.852963, -108.478994	39.88547, -108.24451	39.89475, -108.24192
39.85722, -108.47422	39.88967, -108.21526	39.8979, -108.21536
39.857368, -108.328057	39.88974, -108.2078	39.90278, -108.27148
39.859753, -108.465272	39.88989, -108.19819	39.90337, -108.23502
39.8743, -108.2222	39.89064, -108.23195	39.90342, -108.22119
39.92813, -109.04773	40.089582, -108.787075	40.28772, -108.04491
39.950904, -108.768701	40.090328, -108.870572	40.332203, -107.605007
39.981457, -108.476522	40.090393, -108.874283	40.35002, -108.09332
39.98787, -108.40366	40.09048, -108.864846	40.35047, -108.44616
40.00293, -108.3374	40.09205, -108.84812	40.47962, -107.48924
40.08295, -108.610272	40.10706, -108.224253	40.54163, -106.3907
40.08896, -108.84821	40.110929, -108.186874	40.54691, -106.41014
40.089325, -108.814949	40.211693, -107.4554	40.58421, -106.38116
40.089392, -108.796227	40.21262, -108.27639	40.58382, -106.40112
40.08941, -108.791549	40.28414, -108.02976	40.693772, -107.570308
40.694429, -107.569869	40.972269, -108.332872	40.993496, -108.694141
40.90408, -107.59907	40.9912, -107.9184

(b)Classifications: The classification of the groundwater in these Formations is: - Limited Use and Quality

The groundwater organic chemical standards included in Table A of the section 41.5.C.3 of the Basic Standards for Groundwater (5 CCR 1002-41) for benzene, toluene, ethylbenzene, xylenes, and benzo(a)pyrene will not apply to the groundwater in the specified area. This exception applies to these compounds only when their source is crude oil, condensate, or produced water, or wastes that are intrinsically derived from primary field operations associated with the exploration, development, or production of crude oil and natural gas, otherwise all standards from Table A apply.

5 CCR 1002-42.7

37 CR 13, July 10, 2014, effective 7/31/2014

40 CR 03, February 10, 2017, effective 3/2/2017

40 CR 23, December 10, 2017, effective 12/31/2017

41 CR 11, June 10, 2018, effective 6/30/2018

43 CR 11, June 10, 2020, effective 6/30/2020