Section R. 560.417 - Soil absorption area for conventional treatment and disposal systemsRule 417.
(1) A suitable absorption area for at least 1 original and 1 replacement system shall exist for each development site less than 1 acre in size or each lot where a conventional treatment and disposal system is proposed. Location of each absorption area shall conform to the minimum isolation distances found in Table 2 Table 2
Minimum Horizontal Isolation Distances
| From Absorption Area* To: | Minimum Horizontal Isolation Distance (feet) |
| Private individual well | 50 |
| Surface waters | 100 |
| Basement foundation walls | 10 |
| Top of drop-off | 20 |
| Property lines | 10 |
| Footing drains installed in water table without direct connection to | 25 |
| surfFacoeotwi nagt e drrains installed in water table with direct connection to surface | 50 |
| wateDr rains designed to lower the water table | 100 |
*measured from edge of stone
(2) The department shall establish the required minimum area available for a development site less than 1 acre in size or on each lot for initial and replacement systems in accordance with the regulations of the city, county, or district health department having jurisdiction under the authority granted by Act No. 368 of the Public Acts of 1978, as amended, being §325.1101 et seq. of the Michigan Compiled Laws. For lots or development sites less than 1 acre in size proposed to be served by individual wells and on-site sewage disposal systems or lots or development sites less than 1/2 acre in size proposed to be served by a public water supply and on-site sewage disposal systems, the department may require the submission of a detailed development plan by any of the following persons demonstrating competence: (a) A licensed professional engineer.(b) A professional surveyor.(c) A registered sanitarian. A professional approved by the department.The professional person shall draw the detailed plan to scale with a maximum 2-foot contour interval, shall show the proposed design for the initial and replacement sewage disposal systems, and shall indicate the location intended for the home and individual water supply well. The professional person shall indicate both existing and proposed contours.The professional person shall ensure that areas defined on the plan for sewage systems and the well are at locations that are readily accessible for future maintenance or replacement, or both.
Mich. Admin. Code R. 560.417