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TO: J. DON LAYSON, M.P.H., Director, Environmental Health Division FROM: ROBERT HARRELL, Assistant Director RE: Board of Supervisor's Meeting regarding the Adequacy of the Proposed Package Treatment Plant for Mosher Manor 1. In lieu of the consistency of failure of package sewage treatment plants with various methods of subsurface disposal of sewage effluent, I think we should strongly recommend that a connection to the City of Stockton Sanitary Sewerage System be made if at all possible. 2. It appears that all these systems, even though engineer designed, failed because of underdesign or lack of efficient operation of the plant itself, resulting in suspended solids as well as settleable solids spilling over into leach lines or seepage pits, clogging the lines and pits. This prevents the absorption of sew- age effluent into the surrounding soil. 3. Conversely, many of the plants throughout the County that have not failed, have never been dosed to design capacity, therefore, their performance has really never been tested. ** 4. Freeway Mobilehome Park - R-8 Microphor Unit that malfunctioned causing seepage pit failure in 1971. Additional seepage pits had to be added. 7. Morada Mobilehome Park: No actual failure of plant or disposal field recorded. Several odor complaints received - odors emanated from the plant at various times, created nuisance to surrounding neighborhood. 9. Stockton Verde Mobilehome Park -- Disposal pits clogged up and failed after approximately one year of operation. A grease trap and additional pits were added to correct the failure. 11. Country Squire Mobile Estate - Two.pits (48" x 25') were added because of a "slow down" in percolation of original pits. On January 15, 1974 complaint was received regarding a surface discharge to a field. Investigation revealed the manager had by-passed the subsurface disposal pits and allowed the sewage effluent to discharge on the surface of an adjacent field. 13. Sahara Mobilehome Park - Disposal Field (pits) failed on March 9, 1973. As a result of a complaint the Manager was caught pumping sewage effluent to a storm drain. Correction was made by adding a polishing pond and two 48" x 25' pits. 14. Map ache Mobilehome Park - Disposal field failed in March 1972, pits sealed off, sewage effluent surfaced on ground and rais into a storm drain. Failure was due to poor performance of plant causing a flow of settleable and suspended solids to flow out of plant and into the seepage pits sealing them off to pre- vent absorption into the soil. A large new polishing pond with a series of baffles was added along with leach lines and an entirely new seepage pit area. Q. ** 4. The following comments regard the causes of failure of the various plants located on the map which show failure. January 25, 1974