6.2 Site Characterization The Department will facilitate compliance with these Regulations through a review of the proposed development project. The project should be coordinated with the Department early in the development process to avoid unnecessary conflicts and expense.
6.2.1 Letter of Intent 6.2.1.1 Any persons that propose to construct a large wastewater treatment and disposal system must submit a letter of intent prior to initiating any preliminary reconnaissance soil investigations.6.2.1.2 The letter of intent must contain, at a minimum, the following details: 6.2.1.2.1 The name of the developer, utility and/or landowner.6.2.1.2.2 The size, tax map number(s), 12 digit Hydrologic Unit Code (HUC) watershed name, zoning certificate for and location of the parcel(s).6.2.1.2.3 Number of proposed lots (if applicable), proposed design flow rates and overall scope of project to include level of wastewater treatment and disposal method(s).6.2.1.2.4 Projected start date of site/soil investigative work.6.2.1.2.5 Name of the Class D soil scientist, Professional Geologist and Class C designer.6.2.1.3 A soils and hydrogeological reconnaissance must be undertaken prior to actual fieldwork commencement. The reconnaissance must incorporate a combination of published data and actual field data to establish a general understanding of the site to allow selection of the most favorable areas available to site a large system.6.2.1.4 Prior to the Soil Investigation Report (SIR) and/or Hydrogeologic Suitability Report (HSR) fieldwork commencement but, after a soils and hydrogeological reconnaissance have been completed, a preliminary meeting with the Class D.3 soil scientist, Class C designer, Delaware-licensed Professional Geologist, and DNREC personnel shall be held to discuss the scope of work for both investigations.6.2.2 Soil Investigation Report (SIR) A Soil Investigation Report must be submitted to the Department for review and approval for large on-site wastewater treatment and disposal systems (LOWTDS).
6.2.2.1 General Requirements. Work performed in connection with the SIR requires soil interpretation. These investigations must be completed by, or under the supervision of, a licensed Class D.3 soil scientist. Unless otherwise authorized by the Department, all soils and siting criteria for large systems shall comply with the following requirements:6.2.2.2 The SIR shall contain, at a minimum, the following: 6.2.2.2.1 Site plan drawn to scale not to exceed one (1) inch equals 200 feet.6.2.2.2.2 A topographic map with one (1) foot contour intervals unless the Department approves the use of an alternate scale. Topographic maps for spray irrigation sites may utilize two (2) foot contour intervals.6.2.2.2.3 Location of all wells, well head protection areas, right of ways, watercourses, roads, storm water management features and on-site wastewater treatment and disposal systems within 150 feet of the perimeter of the property.6.2.2.2.4 The proposed disposal area shall be mapped on a grid pattern of not more than 75 feet between observations. Spray irrigation projects must be mapped on a grid pattern at a minimum of one observation every four (4) acres.6.2.2.2.5 Observations must be made using a number of auger borings and test pits to a minimum depth of six (6) feet. Some of these observations shall be extended to the ambient water table, when possible or practical, to augment the data collected during the HSR.6.2.2.2.6 A minimum of one (1) double ring infiltration test per acre, or four (4) total, whichever is larger shall be conducted within the proposed disposal area (PDA). A representative number of double-ring infiltration tests must be approved by the Department for spray irrigation sites. The number of double-ring infiltration tests for a spray irrigation site shall be based upon soil variability. These tests must be performed within the most hydraulically restrictive horizon in the upper six (6) feet. A minimum of three (3) tests must be conducted for each interpretative mapping unit within the PDA.6.2.2.2.7 Determination of an appropriate design percolation rate based upon infiltration tests, soil characteristics (textures, structure, etc.) and number of mapping units within the PDA. Certain site specific conditions may not warrant the testing and may be omitted from testing at the Departments discretion.6.2.2.2.8 Depth of the limiting zone based on either a hydraulically restrictive layer or seasonally saturated materials based on redoximorphic features and/or piezometric study. The results of the site and soil analysis must be provided on the appropriate forms approved by the Department (e.g. Approval page).6.2.2.2.9 Number of proposed lots, dwellings, expected gal/day/unit flow, design flow rate, anticipated disposal method and loading rate.6.2.2.2.10 A general site location map to identify the area.6.2.2.2.11 The location of any wetlands, refer to the 2007 Statewide Wetlands Mapping Project (SWMP) map, and State Tidal Wetlands maps, if applicable.6.2.2.2.12 Identification of any limitation that could affect system performance and design considerations for the anticipated method of disposal.6.2.2.3 Soil chemical testing of each mapping unit must be conducted. Samples must be collected from soil depths of 0-12 inches and 12-24 inches. These chemical tests determine the retention capacity of wastewater constituents in the soil. A minimum of three (3) composite samples for each mapping unit must be collected and tested. See Section 6.8.3 for testing parameters.6.2.2.3.1 Soil chemical testing must be in accordance with Methods of Soil Analysis published by the American Society of Agronomy, Madison, Wisconsin. Other methods, properly documented, may be accepted upon approval by the Department.6.2.2.4 Concerns regarding the suitability of the soils to assimilate the design flow must be addressed before the SIR may be approved by the Department.6.2.2.5 The approved SIR is valid for 10 years from the date of the Department's approval unless the site is permitted for construction prior to this date. The approved SIR will then remain valid as long as the site is permitted. If the permit expires and is not renewed, the SIR also expires if SIR is more than 10 years old. If the site is not permitted within a 10 year period, a supplemental soil investigation report, as outlined in Section 6.2.2.5.1, must be submitted to the Department for approval provided no adverse effects have occurred to the site such as, but not limited to, cutting/filling activities, de-forestation or compaction of the proposed disposal area. The new SIR will be reviewed as outlined in Section 6.2.2.1. 6.2.2.5.1 The supplemental soil investigation report shall include; 6.2.2.5.1.1 Site plan drawn to scale not to exceed one (1) inch equals 200 feet.6.2.2.5.1.2 Location of all wells, well head protection areas, right of ways, watercourses, roads, storm water management features and on-site wastewater treatment and disposal systems within 150 feet of the perimeter of the property.6.2.2.5.1.3 The proposed disposal area (PDA) shall be mapped on a grid pattern of not more than 300 feet between observations. Spray irrigation projects must be mapped on a grid pattern at a minimum of one observation every 10 acres.6.2.2.5.1.4 Observations must be made using a number of auger borings and test pits to a minimum depth of six (6) feet. Some of these observations shall be extended to the ambient water table, when possible or practical.6.2.2.5.1.5 A minimum of one (1) double ring infiltration test shall be conducted within the PDA. A representative number of double-ring infiltration tests must be approved by the Department for spray irrigation sites. The number of double-ring infiltration tests for a spray irrigation site shall be based upon soil variability. These tests must be performed within the most hydraulically restrictive horizon in the upper six (6) feet.6.2.2.5.1.6 Determination of an appropriate design percolation rate based upon infiltration tests, soil characteristics (textures, structure, etc.) and number of mapping units within the PDA.6.2.2.5.1.7 Depth of the limiting zone based on either a hydraulically restrictive layer or seasonally saturated materials based on redoximorphic features and/or piezometric study. The results of the site and soil analysis must be provided on the appropriate forms approved by the Department (e.g. Approval page).6.2.2.5.1.8 Number of proposed lots, dwellings, expected gal/day/unit flow, design flow rate, anticipated disposal method and loading rate.6.2.2.5.1.9 The location of any wetlands, refer to the 2007 Statewide Wetlands Mapping Project (SWMP) map, and State Tidal Wetlands maps, if applicable.6.2.2.5.1.10 Identification of any limitation that could affect system performance and design considerations for the anticipated method of disposal.6.2.3 Hydrogeologic Suitability Report (HSR) A Hydrogeologic Suitability Report must be submitted to the Department for review and approval for large on-site wastewater treatment and disposal systems (LOWTDS).
6.2.3.1 General requirements Work performed in connection with the HSR shall be completed by, or under the supervision of, a Delaware-licensed professional geologist (PG). Reports and related documents must bear the seal and signature of the PG overseeing the project.
6.2.3.2 Site specific HSR requirements General site and project details shall include, but not be limited to the following:
6.2.3.2.1 Proposed wastewater system details: 6.2.3.2.1.2 System dimensions.6.2.3.2.1.4 Dosing schedule or loading rates.6.2.3.2.1.5 Type of wastewater.6.2.3.2.1.6 Level and type of treatment.6.2.3.2.2 Regional (1:24,000 scale) topographic map showing the project site location.6.2.3.2.3 Detailed (1:2,400 scale or larger) map(s) showing:6.2.3.2.3.1 Property boundaries.6.2.3.2.3.2 Roadways and easements.6.2.3.2.3.3 Tax map parcel number(s).6.2.3.2.3.4 Hypsography at one (1) foot contour intervals (must include existing and proposed elevations in proposed disposal area) unless the Department approves the use of an alternate scale. Hypsography for spray irrigation sites may utilize two (2) foot contour intervals.6.2.3.2.3.5 Surface-water features.6.2.3.2.3.6 Current land use.6.2.3.2.3.7 Existing buildings.6.2.3.2.3.8 On-site wells, both existing and proposed (including monitor/observation wells).6.2.3.2.3.9 Test boring locations.6.2.3.2.3.10 Area(s) evaluated for wastewater disposal.6.2.3.2.3.11 Proposed disposal area layout, including spare area.6.2.3.2.3.12 Scale and north arrow.6.2.3.3 On and Off-Site Wells and Surface Water Bodies 6.2.3.3.1 All wells and surface-water bodies located within a 1,000 foot radius of the boundaries of the proposed wastewater disposal area must be identified and shown on an appropriately scaled map. The following well data must be tabulated: permit number, coordinates (in Delaware State Plane, meters, North American Datum of 1983 (NAD83)), water use (e.g. domestic, public, irrigation), total depth, screened interval, diameter, owner's name, owner's address, tax map parcel number. Procedures used to obtain this information shall be documented. All well completion reports and formation logs must be included.6.2.3.3.2 The potential for impact to wells and surface water bodies shall be considered and addressed. If the Department determines it is necessary, proposed methods to minimize the potential for impact to a well or surface water body must be submitted. In some instances, the Department may also require modeling to demonstrate that a well or surface water body will not be adversely impacted by a proposed discharge.6.2.3.3.3 The well survey will remain valid from date of HSR submittal through a five (5) year period unless a construction permit has been issued by the Department. If construction has not been initiated prior to the expiration of the construction permit, a new well survey must be submitted for a permit extension or renewal.6.2.3.4 Hydrogeologic Framework6.2.3.4.1 Hydrostratigraphy Geologic units containing the water-table aquifer and the first regional confining unit shall be identified and described in terms of formation name, lithology, approximate thickness, depositional environment, and stratigraphic relationships with other units. The saturated thickness of the water table aquifer shall be approximated based on available information. In some instances, the Department may require saturated thickness to be documented based on field data.
6.2.3.4.2 Test Borings 6.2.3.4.2.1 Test borings shall be drilled and logged to characterize the near-surface geology in the immediate vicinity of the proposed wastewater disposal area. Test boring requirements vary based on system type and capacity as follow: 6.2.3.4.2.1.1 All systems, including drip irrigation but excluding rapid infiltration basins (RIBs) and spray irrigation systems with proposed discharges >= 2,500 gpd and >= 20,000 gpd must have a minimum of three (3) 20-foot deep continuously sampled test borings.6.2.3.4.2.1.2 All systems, excluding RIBs and spray irrigation systems with proposed discharges > 20,000 gpd must have a minimum of three (3) 40-foot deep continuously sampled test borings.6.2.3.4.2.1.3 All RIB systems with proposed discharges >= 2,500 gpd must have a minimum of three (3) 40-foot deep continuously sampled test borings per proposed acre of disposal area.6.2.3.4.2.1.4 All RIB systems with proposed discharges > 100,000 gpd must have at least one (1) 100-foot deep boring continuously sampled to 40 feet below land surface then every 5 feet thereafter. Boring may be terminated at a shallower depth if a confining bed is encountered < 100 feet below land surface.6.2.3.4.2.1.5 All spray irrigation systems must have at least three (3) 20-foot deep continuously sampled test borings with an additional one (1) 20-foot boring per 10 acres of proposed disposal area.6.2.3.4.2.2 Depending on site or project characteristics, greater test-boring depth or additional test borings may be required. If a restrictive lithology is identified it shall be assumed continuous unless demonstrated otherwise.6.2.3.4.2.3 Subsurface data obtained from borings shall be collected using drilling techniques that preserve sample integrity (e.g. hollow-stem auger with split-spoon, direct-push, coring devices). Samples shall be described using a generally accepted classification system (e.g. Unified Soil Classification System, USDA soil classification system). Test boring coordinates must be determined using a global positioning system (GPS) or standard survey methods and shall be reported in Delaware State Plane, meters, North American Datum of 1983 (NAD83). Test-boring logs shall include: sample descriptions, project name, test-boring identification, coordinates of test boring, general weather conditions, drilling method, name of drilling contractor, name of licensed driller in charge, and name of person logging samples and their association. If a well is completed in the borehole, a well completion report must be submitted to the Department containing "as-built" construction, borehole dimensions, well development methodology, and water levels (after completion and static).6.2.3.4.3 Groundwater Flow6.2.3.4.3.1 At a minimum, three (3) observation wells (OWs) shall be constructed to document flow direction and hydraulic gradient across the proposed disposal area. The Department may require additional wells depending on site or project characteristics. Wells may be completed during the test-boring investigation (see Section 6.2.3.4.2). The wells may also be used as groundwater monitoring wells provided they are constructed and classified according to Delaware Regulations Governing the Construction and Use of Wells and are located in positions suitable to provide representative samples. Well coordinates must be determined using a GPS or standard survey methods and shall be reported in Delaware State Plane, meters, North American Datum of 1983 (NAD83).6.2.3.4.3.2 A top-of-casing (TOC) reference mark shall be established for each well and surveyed into the North American Vertical Datum of 1988 (NAVD 88). The land surface elevation adjacent to each well shall also be surveyed. All water-level measurements shall be taken to the nearest 0.01 foot from the surveyed reference mark on the well's TOC and reported in (i) feet below TOC, (ii) feet below ground surface, and (iii) feet above mean sea level (msl). Water-table contour maps shall be submitted to the Department based on water-level measurements representative of high, low, and average water-table conditions.6.2.3.4.4 Wet-Season Water-Level Monitoring 6.2.3.4.4.1 Wet-season water-level monitoring shall be conducted at least weekly from January 1st through April 30th (see Section 6.2.3.4.3.2 for the collection and reporting of water level data). Wells installed for the purpose of establishing groundwater-flow direction may be used for wet season monitoring. Pressure transducers may be deployed to collect continuous water-level data.6.2.3.4.4.2 On-site wet-season water-level data shall be correlated to the nearest unconfined well(s) with a long-term record ( >= 20 years).6.2.3.4.4.3 The hydrograph shall include; the minimum, 10th, 25th, 50th (e.g., median), 75th and 90th percentiles and maximum water level for the long-term well(s) in conjunction with the on-site water-level data.6.2.3.4.4.4 The peak on-site wet-season water level shall be corrected to the 10th percentile of the long-term record. Water levels <= 10th percentile shall not be corrected.6.2.3.4.5 Aquifer Properties Aquifer properties (e.g. saturated hydraulic conductivity, transmissivity) shall be derived from on-site in-situ testing (e.g. slug test, pumping test). Wells installed to establish groundwater-flow direction may be used for aquifer testing, provided they are suitably constructed and necessary documentation is available. Standard methods shall be used to implement the testing and analyze the data. Testing methods shall be clearly documented, and all data shall be submitted digitally to the Department.
6.2.3.5 Ambient Groundwater Quality 6.2.3.5.1 Ambient groundwater quality shall be established by conducting a minimum of three (3) independent sampling events. Each sampling event shall be at least 30 days apart and include a minimum of three (3) wells. Wells installed for the HSR may be used for long-term groundwater compliance monitoring provided they are constructed and classified according to the Delaware Regulations Governing the Construction and Use of Wells and are located in positions suitable to provide representative samples.6.2.3.5.2 Specific conductance, pH, temperature, dissolved oxygen, and oxidation reduction potential shall be measured using a calibrated field meter during well purging, which should be performed using either a submersible or peristaltic pump. Once the field parameters have stabilized, a groundwater sample shall be obtained and analyzed by a certified laboratory. Sampling requirements are as follows. Additional parameters may be required depending on the proposed wastewater characteristics. Click here to view Image
6.2.3.5.3 Exceptions to these requirements may be considered by the Department. All data, including sampling logs, must be submitted in the HSR and Surface Water Assessment Report (SWAR) (see Section 6.2.4).6.2.3.6 Groundwater Mounding Analysis6.2.3.6.1 A groundwater mounding analysis must be performed to demonstrate that the required vertical isolation distance between the mounded water table and the disposal surface can be maintained (see Exhibit W).6.2.3.6.2 The groundwater modeling requirements vary based on system type and capacity as follow: 6.2.3.6.2.1 All systems, excluding rapid infiltration basins (RIBs), with proposed discharges >= 2,500 gpd and <= 100,000 gpd must, at a minimum, use an analytical model.6.2.3.6.2.2 All systems with proposed discharges > 100,000 gpd must use a numerical model.6.2.3.6.2.3 All RIB systems must use a numerical model.6.2.3.6.3 Selection of an analytical (e.g. Hantush equation) or numerical model (e.g. ModFlow) is at the discretion of the PG. Modeling protocol for the simulation of groundwater mounding must, at a minimum, include the following components (Anderson and Woessner, 1992): 6.2.3.6.3.1 Conceptual Model: A conceptual model must be developed based on the hydrogeologic framework and a preliminary design of the disposal system. Hydrologic boundaries of the groundwater-flow system must be defined in the conceptual model.6.2.3.6.3.2 Model Documentation: The model selected for groundwater mounding analyses must be clearly referenced. Assumptions inherent in the selected model must be stated.6.2.3.6.3.3 Model Design: Implementation of hydrologic properties and boundaries in the mathematical model must be documented to a degree that permits duplication of the modeling effort.6.2.3.6.3.4 Calibration: Where applicable, methods used to calibrate the model must be stated, and calibration statistics must be furnished to the Department. Specifically, the root-mean-squared error (RMSE) and the normalized RMSE between modeled and observed hydraulic head must be presented.6.2.3.6.3.5 Prediction: The model predicted groundwater mound(s) must be presented. Figures and/or tabulated data should be used in conjunction with written text to summarize the results.6.2.3.6.4 The groundwater-mound elevation derived from the calibrated groundwater model shall be corrected with respect to the long-term wet-season water-table elevation determined in Section 6.2.3.4.4.4.6.2.3.6.5 All RIB systems with a design flow >= 100,000 gpd must have a basin test performed to evaluate infiltration rates, the potential for perching and/or groundwater mounding. 6.2.3.6.5.1 The test basin(s) infiltration area must be a minimum of 10 foot diameter circle or a 10 foot by 10 foot square with the basin bottom completed at the same elevation as the proposed full-scale system.6.2.3.6.5.2 The location of the basin(s) within the proposed disposal area shall be determined by the most hydraulically restrictive zone observed in the on-site borings (e.g., clay, silty clay, clayey silt).6.2.3.6.5.3 A work plan must be submitted to the Department for approval prior to commencing the basin test. The work plan shall outline the proposed number of basins, size, location, construction methods, monitoring plan, dosing schedule and test duration.6.2.3.7 Supplemental HSR Considerations Due to unforeseen site complexity, wells and surface water bodies or system design the Department may require additional work beyond the HSR requirements previously outlined.
6.2.4 Surface Water Assessment Report (SWAR) A Surface Water Assessment Report (SWAR) must be submitted to demonstrate that nutrient performance standards for wastewater are being met at the post treatment location of a large on-site system or through natural attenuation processes prior to reaching the closest receiving surface water body in order to comply with surface water quality standards. Work performed in connection with the SWAR requires geologic interpretation. These assessments must be completed by, or under the supervision of, a Delaware-licensed professional geologist (PG). The SWAR and related documents must bear the seal and signature of the PG overseeing the project. The SWAR must be submitted to the Department for review and approval. The SWAR must contain the following:
6.2.4.1 Identification of the watershed(s) in which the system is to be located.6.2.4.2 Ambient groundwater quality determination to include:6.2.4.2.1 Total phosphorus concentrations.6.2.4.2.2 Total nitrogen concentrations.6.2.4.2.3 Oxidation-reduction potential or dissolved oxygen measurement.6.2.4.3 Background soil testing for total phosphorus to include either: 6.2.4.3.1 Fertility Index Value (FIV); or6.2.4.3.2 Mehlich 3 value.6.2.4.4 Phosphorus fate and transport evaluation is required when both conditions below are met: 6.2.4.4.1 A FIV > 100 or soil test value > 100 ppm by Mehlich 3 test.6.2.4.4.2 Groundwater total phosphorus concentrations are > 0.034 mg/L and indicate reducing conditions due to a low dissolved oxygen concentration, < 1 mg/L, or an oxidation-reduction potential < 200 mV.6.2.4.5 One (1) of the following approaches: 6.2.4.5.1 Demonstration that the wastewater treatment facility will achieve applicable performance standards (as defined in the definitions and identified in Exhibit MM) at the post treatment location for nitrogen and, if required, phosphorus as determined in 6.2.4.4 or6.2.4.5.2 Perform a comprehensive analysis to determine surface water impact. A meeting with Department personnel and the PG will be held to discuss work plan development. The comprehensive analysis will include determination of the fate and transport of nitrogen and phosphorus at design and peak flows by means of a groundwater contaminant flow and transport model. Calculation of the groundwater nutrient loading to the nearest surface water body including the resulting modeled groundwater and stream nutrient concentrations. It must be demonstrated that the proposed system will not further impair water quality with respect to dissolved oxygen, enterococcus bacteria, total nitrogen and total phosphorus.6.5 Large System Permitting In order to obtain a permit to construct and operate an on-site wastewater treatment and disposal systems with daily flow rates of >= 2,500 gallons, a permit application must be submitted to the Department for review and approval. A permit application will not be reviewed by the Department until the SIR, HSR and SWAR have been reviewed and approved by the Department.
6.5.1 Large system construction permit application requirements All large system construction permit applications must contain the following:
6.5.1.1 DNREC application form.6.5.1.2 Applicable DNREC fees.6.5.1.3 Written approval from all appropriate governmental entities for the construction for the collection system.6.5.1.4 Design Engineer Report The Design Engineer Report is to be submitted for Department review by the owner or a designated agent. The report must include all applicable calculations and justifications for the overall design of the on-site wastewater treatment and disposal facility including pump stations and treatment processes. Once approved by the Department, the Design Engineer Report becomes the basis of design for the project. Once the facility is permitted, the facility must be constructed, operated and maintained in accordance with the Design Engineer Report. The Design Engineer Report must, at a minimum, address all of the following applicable items:
6.5.1.4.1 General information 6.5.1.4.1.1 Executive summary 6.5.1.4.1.1.3 Design flows (peaks and average)6.5.1.4.1.1.4 Number of equivalent dwelling units6.5.1.4.1.1.5 Influent wastewater characteristics6.5.1.4.1.1.6 Design effluent wastewater characteristics6.5.1.4.1.2 Summary table of design parameters6.5.1.4.1.3 Facility name 6.5.1.4.1.3.1 Brief description of proposed activity6.5.1.4.1.3.2 Facility location6.5.1.4.1.3.2.1 Area by cross roads6.5.1.4.1.3.2.2 All applicable tax map parcels6.5.1.4.1.3.2.3 The 12 digit Hydrologic Unit Code (HUC) Watershed(s) name(s)6.5.1.4.1.3.2.5 Location map6.5.1.4.1.3.3 Developer/owner 6.5.1.4.1.3.3.1 Name 6.5.1.4.1.3.3.2 Mailing and email addresses6.5.1.4.1.3.4 Utility/operator 6.5.1.4.1.3.4.1 Plan of long term ownership and operation6.5.1.4.1.3.5 Certificate of Public Conveyance and Necessity (CPCN). When applicable, a CPCN must be fully executed with the Public Service Commission before the Department will issue a permit to operate a large on-site wastewater treatment and disposal system.6.5.1.4.1.3.6 Conditional use approval6.5.1.4.1.3.7 Lease agreement(s)6.5.1.4.1.3.8 Easement agreement(s)6.5.1.4.1.3.9 Legal documents (see Section 6.4 for additional legal requirements)6.5.1.4.1.4 Site Map 6.5.1.4.1.4.1 Provide scaled drawings with one (1) foot contour elevations, excluding spray irrigation fields, showing: 6.5.1.4.1.4.1.1 Layout of service area (development, strip mall, etc.)6.5.1.4.1.4.1.2 Wastewater treatment facility, including:6.5.1.4.1.4.1.2.1 Lift stations6.5.1.4.1.4.1.2.2 Storage structures6.5.1.4.1.4.1.3 Disposal site(s) and spare disposal site area(s)6.5.1.4.1.4.1.4 Irrigation fields including acreage of each pivot or zone with two (2) foot contour elevations6.5.1.4.1.4.1.5 Access roads and utilities6.5.1.4.1.4.1.6 Location of all monitoring and observation wells (existing and proposed)6.5.1.4.1.4.1.7 Buffers to property lines, watercourses and wetlands6.5.1.4.1.4.1.8 Location of any storm water control structures6.5.1.4.1.4.1.9 Drainage structures6.5.1.4.1.4.1.10 FEMA 100 year floodplain line6.5.1.4.1.4.1.11 Location of any wetlands, refer to the 2007 Statewide Wetlands Mapping Project (SWMP) map, and State Tidal Wetlands maps, if applicable6.5.1.4.1.4.1.12 Watercourses within or contiguous to the site6.5.1.4.1.4.1.13 Residences and habitable structures within or contiguous to the site6.5.1.4.1.5 Design wastewater characteristics Design wastewater characteristics for new facilities must be in accordance with current industry averages. Expansions and phase upgrades must utilize actual parameter concentrations from monitoring results.
6.5.1.4.1.5.1 Influent to treatment facility 6.5.1.4.1.5.1.1 Average and peak daily flow6.5.1.4.1.5.1.3 Total suspended solids (TSS)6.5.1.4.1.5.1.4 Ammonia nitrogen6.5.1.4.1.5.1.5 Nitrate + Nitrite nitrogen6.5.1.4.1.5.1.6 Total nitrogen6.5.1.4.1.5.1.7 Total phosphorus6.5.1.4.1.5.1.9 Chlorides6.5.1.4.1.5.1.11 Additional parameters may be warranted for industrial facilities based on materials processed and Material Safety Data Sheets6.5.1.4.1.5.2 Effluent to disposal system 6.5.1.4.1.5.2.1 Average and peak daily flow6.5.1.4.1.5.2.4 Nitrate + Nitrite nitrogen6.5.1.4.1.5.2.5 Ammonia nitrogen6.5.1.4.1.5.2.6 Total nitrogen6.5.1.4.1.5.2.7 Total phosphorus6.5.1.4.1.5.2.8 Chlorides6.5.1.4.1.5.2.10 Sodium adsorption ratio, if applicable6.5.1.4.1.5.2.11 Metals (Copper, Cadmium, Nickel, Lead, Zinc)6.5.1.4.1.5.2.13 Fecal coliform6.5.1.4.1.6 Wastewater treatment facility process design6.5.1.4.1.6.2 Process description6.5.1.4.1.6.3 Process flow diagram6.5.1.4.1.6.4 Hydraulic profile6.5.1.4.1.6.5 Level of treatment6.5.1.4.1.6.6 Schematic of pump stations and unit processes6.5.1.4.1.6.7 Basin/tank volumes6.5.1.4.1.6.8 Storage capacities6.5.1.4.1.6.9 Capacity of pumps, blowers and other mechanical equipment6.5.1.4.1.6.10 Determination of required storage volume6.5.1.4.1.6.11 Chemical addition6.5.1.4.1.6.12 Grit removal and/or screening process6.5.1.4.1.6.13 Sludge production and disposal process6.5.1.4.1.6.14 Influent and effluent flow metering and recordation6.5.1.4.1.6.15 Overview of mechanical control and alarm system(s)6.5.1.4.1.6.16 Calculations6.5.1.4.1.6.16.1 Process design calculations and equations6.5.1.4.1.6.16.2 Wastewater disposal system sizing6.5.1.4.1.6.16.4 Sludge production6.5.1.4.1.6.16.5 Lift station(s)6.5.1.4.1.6.16.6 Provide all assumptions used and supporting data6.5.1.4.1.7 Effluent disposal system 6.5.1.4.1.7.1 Disposal system type6.5.1.4.1.7.2 Effluent conveyance and distribution6.5.1.4.1.7.3 Flow metering and recordation6.5.1.4.1.7.4 Disinfection6.5.1.4.1.7.5 Loading rates6.5.1.4.1.7.6 Spray specific 6.5.1.4.1.7.6.1 Water balance/determination of design wastewater loading(s)6.5.1.4.1.7.6.2 Phosphorus and other constituent metals loading rates6.5.1.4.1.7.6.3 Determination of land limiting constituent (LLC) and site life based on LLC6.5.1.4.1.7.6.4 Determination of required wetted field area(s)6.5.1.4.1.7.6.5 Actual design wetted field area(s)6.5.1.4.1.7.6.6 Determination of required storage volume6.5.1.4.1.7.6.7 Actual design storage volume6.5.1.4.1.7.6.8 Five (5) year vegetative management plan to include: 6.5.1.4.1.7.6.8.1 Crop type(s)6.5.1.4.1.7.6.8.2 Crop planting sequence6.5.1.4.1.7.6.8.3 Anticipated crop yield based on field data6.5.1.4.1.7.6.8.4 Timing and application rates of commercial fertilizers (See Section 6.3.2.3.13.24), if applicable6.5.1.4.1.7.6.8.5 Planting and harvesting timelines6.5.1.4.1.7.6.8.6 Nitrogen balance calculation sheet6.5.1.4.1.7.6.8.7 Selection of cover crop and management scheme(s)6.5.1.4.1.7.6.8.8 Phosphorus balance calculations for phosphorus limited sites6.5.1.4.1.7.6.9 Construction application requirements6.5.1.4.1.7.6.9.1 After performing individual calculations to determine the design parameters, create and submit an active spreadsheet that incorporates all required calculated design parameters, and demonstrates their mathematical influence on each other per field and per month. The spreadsheet should iterate the design parameters, including, but not limited to, the Design Treatment Capacity, Design Disposal Capacity, Daily Average Flow, Total Spray Acreage, Maximum Allowed Infiltration Rate, Irrigation Rate, Total Storage Volume, etc. Include nitrogen balance calculations taking into consideration the Average Design Wastewater Loading, Nitrogen Concentration in Effluent, Average Annual Precipitation and Fixation, Application of all Fertilizers, Proposed Cover Crop and Cover Crop Management Scheme, Crop Nitrogen Uptake Rates.6.5.1.4.1.7.6.9.2 Ensure the spreadsheet includes monthly storage pond volume calculations and required storage calculations. Ensure that the calculations demonstrate the ability to evacuate the maximum accumulated storage within a 90 day period and include the following considerations on a monthly basis: Average Precipitation, Volume Added to Pond from Precipitation, Evaporation, Volume lost due to Evaporation, Net Change in Pond Volume, Treated Effluent Volume to Pond, Potential Application from Pond to Spray Fields, Change in Volume, Required Accumulated Storage.6.5.1.4.1.8 Monitoring of effluent, groundwater and surface waters6.5.1.4.1.8.1 Site map depicting proposed locations of monitoring points, wells and lysimeters6.5.1.4.1.9 Project phasing (see Section 6.5.11)6.5.1.5 Plans The plans must include, at a minimum, the following applicable items:
6.5.1.5.1 Site Plan: 6.5.1.5.1.1 Layout of collection system(s), including lift station and force mains.6.5.1.5.2 General layout of the wastewater treatment facility including:6.5.1.5.2.1 Topography of the wastewater treatment facility site with one (1) foot contours unless the Department approved the use of an alternate scale. Topography for spray irrigation fields may utilize two (2) foot contour intervals.6.5.1.5.2.2 Size and location of all proposed wastewater treatment plant structure(s).6.5.1.5.2.3 Process flow diagram showing the flow through all treatment units.6.5.1.5.2.4 Piping and appurtenances (including arrangements for bypassing individual units).6.5.1.5.2.5 Materials handled and direction of flow through pipes must be shown.6.5.1.5.2.6 Hydraulic profiles showing the flow of wastewater, supernatant liquor, and biosolids.6.5.1.5.2.7 Influent and effluent flow meters locations.6.5.1.5.2.8 Monitoring location point(s).6.5.1.5.2.9 Location, dimensions and elevations of all existing and proposed facility components.6.5.1.5.2.10 Type, size, pertinent features and manufacture's rated capacity of all pumps, blowers, motors, and other mechanical devices, unless included in the specifications.6.5.1.5.3 General layout of wastewater disposal area, including: 6.5.1.5.3.1 Topography of the wastewater disposal site with one (1) foot contours unless the Department approves the use of an alternate scale. Topography for spray irrigation fields may utilize two (2) foot contour intervals.6.5.1.5.3.2 Proposed disposal system elevations.6.5.1.5.3.3 Disposal system location, size and layout.6.5.1.5.3.4 Spare disposal system location, size, layout and dimensions.6.5.1.5.3.5 Piping inverts to disposal system.6.5.1.5.3.6 Monitoring and observation well locations as approved by the Department.6.5.1.5.3.7 Overlay of disposal area with approved soil delineation area.6.5.1.5.3.8 Buffer areas.6.5.1.5.3.9 Provide disposal system layout (identify laterals, transmission line, manifolds, valving, vaults, splash blocks, runs, laterals, air release valves, remote zoning, etc.).6.5.1.5.3.10 Cross section of disposal system(s).6.5.1.5.3.11 Cut/fill sections, if applicable.6.5.1.5.3.12 Piping details to system including inverts.6.5.1.5.3.13 Valving details of disposal system.6.5.1.5.3.14 Splash block details for rapid infiltration basin(s).6.5.1.5.3.15 Berm details applicable to the disposal system.6.5.1.5.3.16 Fence details.6.5.1.5.3.17 Sign details.6.5.1.5.3.18 Silt fence details.6.5.1.5.4 Sequence of Construction6.5.1.6 Technical Specifications6.5.1.6.1 The specifications accompanying the plans shall include, but not be limited to, the following:6.5.1.6.1.1 Detail of the design requirements pertaining to:6.5.1.6.1.1.1 The quality of materials and workmanship.6.5.1.6.1.1.2 Fabrication of the project.6.5.1.6.1.1.3 The type, size strength, operating characteristics, and ratings of equipment.6.5.1.6.1.2 Equipment list - provide all equipment specifications to include cut sheets, model numbers, pump curves, system curves, capacities, etc.6.5.1.6.1.3 Complete specifications for all mechanical equipment, including machinery, valves, piping and pipe joints.6.5.1.6.1.4 Meters, laboratory fixtures and equipment.6.5.1.6.1.5 Operating tools.6.5.1.6.1.6 Construction materials.6.5.1.6.1.7 Miscellaneous appurtenances.6.5.1.6.1.8 Chemicals used.6.5.1.6.1.9 Instruction for testing materials and equipment, as necessary, to meet design standards.6.5.1.6.1.10 Operating tests for the completed facilities.6.5.2 Large System Construction Permit 6.5.2.1 Public Advertisement 6.5.2.1.1 Upon approval of the completed application for a construction permit or construction permit renewal, the Department will advertise receipt of the application and conduct any hearings in accordance with7Del.C.Ch. 60. The cost of the advertisement is to be borne by the applicant. If a public hearing is not conducted, and all requirements of these regulations have been fulfilled, a construction permit shall be issued by the Department.6.5.2.2 Construction Permit Expiration6.5.2.2.1 All construction permits for large on-site wastewater treatment and disposal systems pursuant to these Regulations may be issued for no more than five (5) years.6.5.2.2.2 If construction has not been initiated prior to the expiration of the construction permit, and there are proposed changes to the approved design, the applicant must submit a new or updated Design Engineer Report and construction plans as outlined in Sections 6.2.3, 6.5.1.4 and 6.5.1.5 for project re-evaluation. This will require public notification.6.5.2.2.3 If construction has been initiated prior to the expiration of the construction permit, and construction has not been completed prior to the expiration of the permit, the permittee may apply for a one (1) year extension of the construction permit.6.5.2.2.4 If construction has not been initiated or construction has not been completed prior to the expiration of the one (1) year extension, provided, the SIR is valid, and there are no changes to the approved design prior to the expiration of the construction permit, the applicant must submit a construction permit application along with applicable fees, and a construction schedule.6.5.2.3 Construction Permit Extension 6.5.2.3.1 The application for extension must include the following:6.5.2.3.1.1 A DNREC extension form.6.5.2.3.1.2 Applicable Department fees.6.5.2.3.1.3 Construction schedule.6.5.3 Large System Operation Permit Upon completion of construction, an operation permit must be obtained from the Department prior to system operation. A classification shall be performed on the facility in accordance with Regulations Licensing Operators of Wastewater Facilities. The class of operator required for the facility will be determined by the Board of Certification for Licensed Wastewater Operators in accordance with the Regulations Licensing Operators of Wastewater Facilities. All large systems must be under the direction of a licensed operator. The licensed operator must be available at all times. The licensed operator shall be on-site at the time the system is put into operation and is to receive all training as necessary to properly operate the system.
6.5.3.1 Application requirements for an operation permit Prior to the issuance of an operation permit, the following applicable items must be submitted. Failure to submit all required information constitutes grounds for denial of the operation permit.
6.5.3.1.1 A DNREC application form.6.5.3.1.2 Applicable Department fees.6.5.3.1.3 Design Engineer Inspection Report(s) certifying the facility has been constructed in accordance with approved plans and specifications.6.5.3.1.4 Copies of any other applicable State/County inspection reports.6.5.3.1.5 Contractor's Certificate of Completion.6.5.3.1.6 A certificate or letter of completion/approval from the wastewater treatment plant manufacturer.6.5.3.1.7 A copy of the agreement with a licensed operator and license certification.6.5.3.1.8 A copy of the agreement with a regulated wastewater utility in the State of Delaware that the treatment facility will be operated under.6.5.3.1.9 A set of "as-built" drawings of the facility bearing the seal and signature of a licensed Professional Engineer registered in the State of Delaware. The "as-built" drawings must include:
6.5.3.1.9.1 Site map showing the location of all structures, piping and appurtenances, disposal areas and buffers.6.5.3.1.9.2 A full equipment list and technical specifications for all equipment used, if different than submitted in the permit application.6.5.3.1.9.3 The new topography elevations of the system.6.5.3.1.9.4 Monitoring/Observation well elevations at the top of the casing (TOC) and at the ground surface, GPS coordinates (State Plane), and local topography tied to a common benchmark.6.5.3.1.9.5 The location and screen depth, length of stick up, and well ID's must be provided for each monitor well.6.5.3.1.9.6 Elevations at the center and corners of each RIB.6.5.3.1.10 A copy of all Collection System Permit(s)6.5.3.1.11 Inspection Reports demonstrating collection system has been installed and inspected by Design Engineer6.5.3.1.12 If the collection system does not require county approval, the permittee must supply the Department with all testing procedures conducted on the collection system, force main(s) and lift station(s).6.5.3.1.13 An Operation and Maintenance (O&M) Plan in accordance with Section 6.76.5.3.1.14 Spreadsheet summary of groundwater monitoring well information.6.5.3.1.14.1 GPS information detailing the northings and eastings; the local well ID number; and the DNREC Well ID/Well Permit Number. The GPS information must be in either Delaware State Plane, North American Datum 1983 meters; or Latitude and Longitude decimal degrees.6.5.3.1.14.2 TOC elevations survey results for all monitoring wells to be utilized for groundwater monitoring. Provide the length of the well stickup and the well survey information to the closest 0.01 feet. Provide a permanent mark, etch, or fixture to be used to specify the survey point where the TOC elevations were read.6.5.3.1.15 A summary report detailing the analyses of the background groundwater quality sampling program that was conducted consisting of at least three (3) samples one (1) month apart and analyzed prior to the initiation of disposal activities (see Section 6.6.3.16).6.5.3.1.16 Biosolids Management Plan6.5.3.1.16.1 A copy of a biosolids management contract if a third party will be utilized to manage the biosolids.6.5.3.1.17 Legal documents (see Section 6.4)6.5.3.2 Operation Requirements 6.5.3.2.1 On-site systems and spray irrigation facilities (additional spray requirements in Section 6.5.3.2.2) 6.5.3.2.1.1 Samples and measurements taken as required in the operation permit shall be representative of the volume and nature of the monitored discharge. If there has been significant increase (> 25%) in the characterization of any one parameter of the effluent wastewater as established in the Design Engineer Report, the permittee shall resample the wastewater and submit the additional analyses to the Department. The permittee shall re-characterize the wastewater to determine if a change in treatment is required and/or if the land limiting constituent has changed. If a change in treatment is required and/or if the land limiting constituent has changed, a revised Design Engineer Report shall be submitted to the Department.6.5.3.2.1.2 Roof downspouts, foundation drains, area drains, storm sewers, combined sewers or appurtenances thereto or any sewer or device carrying storm water shall not be connected to the system.6.5.3.2.1.3 The wastewater must be applied in a manner such that the application is even and uniform over the disposal area.6.5.3.2.1.4 The groundwater mound created by the added infiltration shall at no time reach within two (2) feet of the ground surface in any section of the disposal area. Should the groundwater mound exceed this limit, the permittee shall cease all distribution of wastewater to the affected area until the groundwater mound recedes to acceptable levels.6.5.3.2.1.5 Connections or additions to the system other than those indicated on the approved plans are prohibited without prior approval from the Department.6.5.3.2.1.6 In the event that the permittee installs new monitoring wells or replaces any existing monitoring wells, the permittee shall submit to the Department new elevation details relative to the common benchmark previously established. Additionally, the permittee shall conduct a groundwater quality sampling program prior to initiation of wastewater disposal activities on the area incorporating the well. The sampling program shall be sufficient to establish representative ground water quality at each well prior to initiation of the wastewater disposal activities. A minimum of three (3) samples shall be collected at least one (1) month apart and analyzed. A summary report detailing all analyses shall be submitted to the Department prior to initiation of wastewater disposal activities. Analyses shall include the parameters iterated in Section 6.8.1.6.5.3.2.2 Spray Irrigation Facilities 6.5.3.2.2.1 The discharge to the spray irrigation fields shall be free from material such as floating solids, sludge deposits, debris, scum, oil and grease.6.5.3.2.2.2 The spray irrigation fields shall be managed to assure at a minimum that: 6.5.3.2.2.2.1 Spray irrigation of wastewater shall only occur on fields being prepared for planting or already planted with a crop and shall not occur on fields with crops not actively growing or on voluntary vegetation.6.5.3.2.2.2.2 The spray fields shall be maintained in such a manner as to prevent wastewater pooling and/or discharge of wastewater to any surface waters. Should pooled areas become evident, spraying on those areas shall be prohibited until saturated conditions no longer exist.6.5.3.2.2.2.3 Aerosols or nuisance odors shall not extend beyond the boundary of the spray irrigation site when treated wastewater is being applied. If odors are produced that are considered to be a public nuisance, the permittee shall take the necessary steps to eliminate such odors. All action taken shall be reported to the Department.6.5.3.2.2.2.4 Erosion controls must be employed to prevent wastewater runoff from the spray irrigation fields. The permittee must notify the Department immediately if any wastewater runoff occurs.6.5.3.2.2.2.5 The spray irrigation field's crops must be maintained in optimal condition, including any necessary weed management, reseeding, or other vegetative management practices.6.5.3.2.2.2.6 Effective vegetative management shall be provided such that crops harvested on the spray irrigation sites are removed from the sites.6.5.3.2.2.2.7 Spray irrigation is prohibited when saturated or frozen soil conditions exist.6.5.3.2.2.2.8 The permittee shall take appropriate measures to protect the spray irrigation system from damage due to sub freezing conditions.6.5.3.2.2.2.9 Any leaks shall be reported to the Department and repaired immediately.6.5.3.2.2.2.10 Potable ground or surface water may be used for distribution system testing and irrigation to establish vegetation when sufficient treated effluent is not available.6.5.3.2.2.2.11 Permittee must notify the Department in writing prior to utilizing the freeboard in any lagoon or immediately upon unexpected encroachment into freeboard. In the event of encroachment into freeboard, Permittee shall contact the Department to coordinate relief measures. In the event of an emergency, Permittee may contact the Department via telephone; however, written notification must subsequently be provided within 5 days of encroachment.6.5.3.2.2.2.12 If the surface horizon soil phosphorus levels become excessive as defined by the University of Delaware soil testing methods, the permittee shall perform a Phosphorus Site Index (PSI) study of the site. Based on the results of the PSI study, the Department may require the permittee to submit a plan for Department review and approval detailing steps the permittee will take to reduce the phosphorus loading rates at the site to crop phosphorus uptake levels.6.5.3.2.3 Operation Permit Conditions Conditions necessary for the protection of the environment and the public health may differ from facility to facility because of varying environmental conditions and wastewater compositions. The Department may establish specific permit conditions. Specific conditions may be established in consideration of characteristics specific to a facility and inherent hazards of those characteristics. Such characteristics may include, but are not limited to:
6.5.3.2.3.1 Chemical, biological, physical, and volumetric characteristics of the wastewater.6.5.3.2.3.2 Geological and climatic nature of the facility site.6.5.3.2.3.3 Size of the site and its proximity to population centers, ground and surface water.6.5.3.2.3.4 Legal considerations relative to land use and water rights.6.5.3.2.3.5 Techniques used in wastewater distribution and the disposition of that vegetation exposed to wastewaters.6.5.3.2.3.6 Abilities of the soils and vegetative covers to treat the wastewater without undue hazard to the environment or to the public health.6.5.3.2.3.7 Potential for adverse environmental impacts to groundwater resources or surface water bodies.6.5.3.2.3.8 The need for monitoring and recordkeeping to determine if the facility is being operated in conformance with its design and if its design is adequate to protect the environment and the public health.6.5.3.2.3.9 The Department may impose, in any permit for large or community systems, standards for evaluating the treatment and disposal system performance and compliance with these regulations. These standards may be in the form of limitations on flow and pollutant concentrations and mass loadings, or testing basins at design loading rates. The standards shall reflect the utilization of best management and operational practices.6.5.3.3 Permit Modifications/Amendments 6.5.3.3.1 In consultation with the permittee, the Department may modify or amend an existing permit provided that the modifications would not result in an increased impact or risk to the environment or to public health.6.5.4 Operation Permit Re-Issuance At least 180 days prior to the expiration date of the operation permit, the permittee must submit an application for renewal or notify the Department of the intent to cease discharging by the expiration date. The application package for systems with a design flow >= 100,000 gpd, must include a five (5) year Compliance Monitoring Report (CMR). In the event that a timely and complete application has been submitted as determined by the Department, and the Department is unable, through no fault of the permittee, to issue a new permit before the expiration date of this permit, the terms and conditions of this permit are automatically continued and remain fully effective and enforceable until a decision is made on the new application.
6.5.4.1 At a minimum, the following applicable items must be addressed. Individual permits may require additional specific items that must be submitted in the permit renewal application package.6.5.4.2 Permit renewal application package; 6.5.4.2.1 DNREC application form6.5.4.2.2 Applicable DNREC fees6.5.4.2.3 Request for permit modifications6.5.4.2.4 Revised O&M plan, if changes, including but not limited to operational or facility upgrades.6.5.4.3 CMR Requirements 6.5.4.3.1 Soils Report 6.5.4.3.1.1 Soil reports must be signed and sealed by a Class D.3 soil scientist and contain the following: 6.5.4.3.1.1.1 One (1) soil boring/acre must be performed in the spare area. Soil profile descriptions must be logged on a soil profile note page(s).6.5.4.3.1.1.2 List new wells, storm water ponds, filling/cutting or activity that will potentially impact the current and/or future operation of the drainfield(s) and spare area(s) on a site map.6.5.4.3.1.1.3 Identify any areas prone to ponding, saturation or subsurface breakouts, reduction in design infiltration rates and proposed remedial activities necessary to return the site to permit compliance, if applicable.6.5.4.3.1.1.4 Soils investigation is not required in the active disposal area.6.5.4.3.1.1.5 Conclusions must be based on the monitoring/performance data. The conclusion and data must be summarized.6.5.4.3.1.1.6 Recommendations for future monitoring, system upgrades or improvements, O&M, etc. must be provided.6.5.4.3.1.1.7 Spray Irrigation Facilities 6.5.4.3.1.1.7.1 Review soil analysis lab results for the life of the permitted land application activities and report any trends which may be developing.6.5.4.3.1.1.7.2 Review the design land limiting constituents and the approximate site life calculated at the time of design. Review the current levels of potential land limiting constituents (e.g., hydraulic loading, phosphorus, cadmium, copper, lead, nickel, zinc). Based on trends of the monitored parameters, determine the current land limiting constituent and estimate remaining site life.6.5.4.3.1.1.7.3 Review pH levels, liming activities, additional fertilizer applications, and cropping uptakes as they relate to permit conditions and report any concerns.6.5.4.3.1.1.7.4 Determine if current cropping sequences/rotations are appropriate. Recommend any necessary changes.6.5.4.3.1.1.7.5 Spray irrigation fields must be assessed to determine if soils renovation or maintenance is necessary. Assessments must address crop consistency, soil monitoring results, infiltration, and compaction. The assessment must identify any visual signs of the ponding of wastewater, runoff, poor or dead vegetation, compaction, and any other impacts affecting the facility grounds. The assessment must also indicate whether the disposal application areas show signs of stress or failure.6.5.4.3.2 Hydrogeologic Suitability Report 6.5.4.3.2.1 Hydrogeological reports must be signed and sealed by a Delaware-licensed professional geologist (PG) and must, at a minimum, include the following: 6.5.4.3.2.1.1 The current number of units connected to the system must be reported. Also report the number of units connected for each year of the five (5) year reporting period and location of units.6.5.4.3.2.1.2 A map of the current monitoring/observation well network must be provided. Any changes to the well network (e.g., replacement, abandonment) must be documented.6.5.4.3.2.1.3 The following well data must also be tabulated: permit number, local identifier, easting, northing, diameter, screen interval, top of casing (TOC) elevation and land-surface elevation. The casing (inner or outer) from which the water-level measurement will be taken should be specified.6.5.4.3.2.1.4 Metered flow demonstrating volumes versus time must be plotted for average monthly influent, average monthly effluent, and daily peak influent flows. Trends identified in the data should be discussed.6.5.4.3.2.1.5 Water-table hydrographs must be provided to demonstrate that the required unsaturated zone thickness is maintained beneath the wastewater system (see Exhibit W). The hydrographs must show hydraulic head (in ft above mean sea level (msl)) versus time. Hydraulic head data must be evaluated with respect to the disposal surface.6.5.4.3.2.1.6 Precipitation data for the reporting period must be plotted based on nearby meteorological stations or on-site observations. Compare peak flows to precipitation data to detect any inflow and infiltration into the collection system.6.5.4.3.2.1.7 Maps showing the configuration of the water table and groundwater flow direction must be presented for (i) peak, (ii) average, and (iii) minimum water-table conditions for the reporting period.6.5.4.3.2.1.8 The peak observed (or interpolated) mound beneath each system or basin must be reported as a percentage of the simulated (or predicted) mound. Example: the simulated pre-system operation water table was 50 feet msl and the simulated post-system or basin mound was 55 feet msl. An observed mound of 52 feet msl would constitute 40% of the simulated mound. This percentage must be compared to metered flows (reported as a percentage of peak flow). The PG may consider re-running the model to verify mounding using the observed flow.6.5.4.3.2.1.9 Temporal trends in both effluent and groundwater quality must be evaluated and compared to background samples and/or previous sampling results. Tabulated influent, effluent, and monitoring well data must be provided. Data must also be plotted verses time to depict trend lines. Where applicable, groundwater data must be evaluated with respect to drinking water standards established by the U.S. EPA.6.5.4.3.2.1.10 Some site specific criteria will be necessary for specialized conditions, needs, and/or circumstances (e.g., regional systems, phased approaches).6.5.4.3.2.1.11 The PG must provide a conclusion of the operating status of the disposal system based on the monitoring/performance data. Recommendations for future monitoring, system upgrades or improvements, operation and maintenance (O&M) should be provided as necessary.6.5.4.3.3 Engineering/Operation Report 6.5.4.3.3.1 The Engineering/Operation Report must be signed and sealed by a Delaware licensed Professional Engineer and must, at a minimum, include the following: 6.5.4.3.3.1.1 Operation & maintenance concerns and/or changes, if any, must be summarized. Items to address may include, but need not be limited to, the following: infiltration problems, equipment replacement, system and/or basin maintenance, treatment system problems and crop activities (e.g. harvesting, planting). Dates and descriptions of routine maintenance procedures, such as basin raking, must also be provided.6.5.4.3.3.1.2 List, summarize, and date all compliance items relative to the permit (e.g. enforcement actions, Notice of Violations, warning letters, self-reported permit violations and effluent limitation exceedences). Indicate any outstanding non-compliance issues.6.5.4.3.3.1.3 Provide an updated active spreadsheet as required in 6.5.1.4.1.7.6.9 utilizing existing data where possible and appropriate.6.5.4.3.4 Vegetative Management Plan 6.5.4.3.4.1 The vegetative management plan must be executed and approved by a Nutrient Consultant, Certified Crop Advisor, or any appropriate professional authorized by the Delaware Department of Agriculture and must, at a minimum, include the following: 6.5.4.3.4.1.1 Crop type(s).6.5.4.3.4.1.2 Crop planting sequence.6.5.4.3.4.1.3 Anticipated crop yield based on field data.6.5.4.3.4.1.4 Timing and application rates of commercial fertilizers.6.5.4.3.4.1.5 Planting and harvesting timelines.6.5.4.3.4.1.6 A recalculated monthly nitrogen balance using averaged actual irrigation rates and averaged actual nitrogen monitoring results.6.5.4.3.4.1.7 Phosphorus balance calculations for phosphorus limited sites.6.5.4.3.5 BioSolids Management 6.5.4.3.5.1 Permit/Contract: 6.5.4.3.5.1.1 If a third party manages the biosolids, provide a copy of the most recent biosolids management contract.6.5.4.3.5.1.2 If the permittee manages the biosolids, provide a copy of the current DNREC - Biosolids Permit.6.5.4.3.5.2 Provide a summary of the volume (gallons) of biosolids generated, removed and/or stored over the past five years.6.5.4.3.6 Overall Conclusions/Recommendations 6.5.4.3.6.1 Conclusions based on the monitoring/performance data of the wastewater treatment facility and disposal system must be summarized and submitted by the engineer, consultant and/or permittee. Recommendations for future monitoring, system upgrades or improvements and O&M should be provided as necessary. Systems with compliance matters that are unresolved must include a work plan detailing the course of action proposed to return the facility to compliance. Systems with existing compliance matters that are unresolved with an existing work plan must provide a status update, a summary of actions completed, and any adjustments to the work plan's timeline or course of actions.6.5.4.4 Emergency Repairs 6.5.4.4.1 Emergency repairs or the replacement of critical "like kind" components of the wastewater treatment facility necessary for the continued operation of the facility may be performed without first obtaining a construction permit from the Department.6.5.4.4.2 A report must be submitted to the Department within five (5) days of completion of the emergency repairs. The report must summarize the nature of the emergency and the repairs performed. All violations must also be reported in accordance with Section 6.5.9.6.5.5 Severability The provisions of a permit are severable. If any provision of a permit, or the application of any provision of a permit, to any circumstances is held invalid; the application of such provision to other circumstances, and the remainder of the permit, shall not be affected thereby.
6.5.6 Permit Transferability Permits may be transferred to a new owner or operator. The permittee must notify the Department by requesting a change of ownership of the permit before the date of transfer. The transfer must be consistent with any notarized legal documents and/or CPCN required by these Regulations. The legal documentation must be provided with the application. The application must be received 30 days before the transfer.
6.5.6.1 No person shall transfer a permit from one (1) person to another unless 30 days written notice is given to the Department, indicating the transfer is agreeable to both persons, and approval of such transfer is obtained in writing from the Department, and any conditions of the approval of such transfer is obtained in writing from the Department, and any conditions of the transfer approved by the Department are complied with by the transferor and the transferee.6.5.6.2 The notice to the Department shall contain a written agreement between the transferor and the transferee, indicating the specific date of proposed transfer of permit coverage and acknowledging responsibilities of current and new permittees for compliance with and liability for the terms and conditions of this permit. The notice shall be signed by both the transferor and the transferee.6.5.7 Permit Revocation 6.5.7.1 The Department may revoke a permit if, among other things, the permittee violates any permit condition, these regulations, fails to pay applicable Departmental fees, obtains the permit by misrepresentation or fails to fully disclose all relevant facts.6.5.7.2 Except in cases of emergency, the Department shall issue a written notice of intent to revoke to the permittee prior to final revocation. Revocation shall become final within 20 days of receipt of the notice by the permittee, unless within that time the permittee requests an administrative hearing in writing.6.5.7.3 The Department shall notify the permittee in writing of any revocation hearing at least 20 days prior to the date set for such hearing.6.5.7.4 If the Department finds the public health, safety or welfare requires emergency action, the Department shall incorporate findings in support of such action in a written notice of emergency revocation issued to the permittee. Emergency revocation shall be effective upon receipt by the permittee. Thereafter, if requested by the permittee in writing, the Department shall provide the permittee a revocation hearing.6.5.8 Sunset Requirement 6.5.8.1 Operation permits for large systems that were issued without a permit expiration date shall expire five (5) years following the promulgation date of these Regulations.6.5.9 Noncompliance Notification 6.5.9.1 The permittee shall report to the Department's Enforcement Section at (800) 662-8802 any unpermitted release or discharge of any contaminant into the air, or a pollutant, including petroleum substances, into surface waters, groundwater, or onto land as soon as the permittee has knowledge of, or should have had knowledge of, the release or discharge.6.5.9.2 If for any reason the permittee does not comply with, or will be unable to comply with, any effluent limitations or other conditions specified in the permit, the permittee shall provide the Department with the following information in writing within five (5) days of becoming aware of any actual or potential noncompliance: 6.5.9.3.1 A description and cause of the noncompliance with any limitation or condition.6.5.9.3.2 The period of non-compliance including exact dates and times; or, if not yet corrected, the anticipated time the noncompliance is expected to continue.6.5.9.3.3 The steps being taken or planned to reduce, eliminate and/or prevent recurrence of the noncompliant condition.6.5.10 Regional Facilities 6.5.10.1 Design 6.5.10.1.1 Regional wastewater treatment and disposal facilities (regional facility) must be owned and operated by a wastewater utility or governmental agency, however government agencies are exempt from the requirements of Section 6.5.10.3.6.5.10.1.2 The regional facility must be designed to not exceed the site's most limiting disposal capacity based on the SIR, HSR and SWAR, collectively.6.5.10.1.3 If the regional facility is constructed in phases, the number of units that will be authorized to be connected to the regional facility will be limited to the approved capacity of the wastewater treatment and disposal system for that phase.6.5.10.1.4 The force main, pump station, and appurtenances to the off-site disposal area and/or development(s) must be permitted by the Department for construction before the off-site disposal area and/or development(s) may be included as part of the regional facility.6.5.10.1.5 All regional facilities must monitor for all constituents identified under the ambient groundwater quality sampling chart in Section 6.2.3.5.6.5.10.2 Required documents for permitting: 6.5.10.2.1 The applicant must submit a Regional Facility Plan to the Department for review and approval. The plan must: 6.5.10.2.1.1 Identify the proposed service area for the regional facility.6.5.10.2.1.2 Provide documentation of the proposed conveyance system.6.5.10.2.1.3 Demonstrate the total treatment and disposal capacity, including 100% spare area, if applicable.6.5.10.2.1.4 Propose the total number of equivalent dwelling units (EDU's) in accordance with Section 6.3.1.5.6.5.10.2.1.5 Identify each subdivision proposed to be connected to the regional facility by name, tax parcel number and number of EDU's.6.5.10.2.1.6 Include the appropriate county approval documentation.6.5.10.3 Required documents for connecting subdivisions:6.5.10.3.1 A subdivision shall not be connected to a regional facility until all of the applicable required documents have been submitted to and approved by the Department and there is sufficient demonstrated capacity (based on the approved SIR, HSR and SWAR) to connect the subdivision to the regional facility. A subdivision phase may only be connected after being incorporated into the operating permit. In order to connect a subdivision to the regional facility, the permittee must submit the following for approval: 6.5.10.3.1.1 A Certificate of Public Convenience and Necessity (CPCN).6.5.10.3.1.2 A zoning certificate.6.5.10.3.1.3 A binding agreement from the developer/owner stating that they authorize connection of their subdivision to the regional facility.6.5.10.3.1.4 A copy of the approved subdivision recordation plan. The number of units shown on the approved county subdivision recordation plan must agree with the number of units identified in the Regional Facility Plan.6.5.10.3.1.5 A copy of the approved collection system permit number and all collection system inspection approvals (county, if required).6.5.11 Phasing A system may be designed in phases to allow actual flow data to be collected to determine the necessity and timing for treatment facility upgrades/additions and to accommodate initial low influent flows to the wastewater treatment plant.
6.5.11.1 Application 6.5.11.1.1 The applicant must submit an overview of the design of all phases of the facility. The applicant may apply for the permitting of each individual phase or for the permitting of multiple planned phases for the facility.6.5.11.1.2 The applicant must identify the capacity of each phase of the project.6.5.11.1.3 Each phase of the system must be designed to be incorporated into the final design of the system. The Design Engineer Report must demonstrate how the components of each phase will be utilized within subsequent phases.6.5.11.1.4 The applicant shall provide information regarding managing low flow and/or organic loadings through integration of multiple treatment units.