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I A& TO;r J. DON L. 0N, M.P.H., Director, Environm, al Health Division FROM: RObLRT C. HARRELL, Assistant Director RE: Sanitary Sewerage Facilities for Subdivisions DATE: May 30, 1975 i. The Guidelines for taste Disposal From Land Developments published by the California Regional Water Quality Control Board, Central Valley Region and the recent revision of the Rules and Regulations of San Joaquin County Ordinance No. 949 was an attempt to upgrade sewage disposal In land developments and prevent situations from occurring due to sewage disposal failures that create an expense and 'hardship to the present property owner and place responsibility on the local healtn department to solve the problem of making a repair to a private sewage disposal system. 2. The Sari Joaquin County Planning Department, the Planning Commission and the board of Supervisors along wltii the community have created this problem by zoning areas outside of the fringe areas of incorporated titles RA -20 and RA -30 without due consideration for puulic utilities, specifically in this case water and sewage. Article IV of San Joaquin County Zoning Ordinance #850 requires the source of water and method of sewage disposal be shown on a tentative Division of Land Map. Future planning should include source of water and matnod of sewage disposal for RA -20, RA -3U or other residential lots. It is questionable as to whether 20,000 square foot lots can accomodate septic tanks) and in some cases 30,000 square foot.lots because of shape and contour. 3. The Rules and Regulations of San Joaquin County Ordinance No. 549 allows for toe installation of septic tanks In new land developments and sets specific conditions to be met if septic tanks are allowed as individual sewage disposal systems. However, the disposal area set aside must ue the "minimum usable disposal area" and must be given a priority In the development of each lot, not fitted in place meal to aenefit the developer in creating lots. 4. Snape of lots, frontage, easement, contour, public well influence, soils, and cost of lot and house are factors that govern the use of septic tanks for individual sewage disposal systems. All these factors should be considered before the initial proposal is submitted to the Development Committee.