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s.. Mr.Jadi Singh Page 11 January 23,2003 `~ The items of discussion during the meeting were the proposed facility's use permit, Regional Water Quality Control Boards interest in the project, soil conditions, percolation rates, ground- water depth, estimate of average daily sewage flow rate, and treatment systems which operate and have been evaluated by the Heath Department. A MicroSepTec waste water treatment system is one type of an approved treatment system presently in use in San Joaquin County. Essentially,the major action item at the meeting was the establishment of an average daily sewage quantity for Phase 1 by reviewing water use records from similar facilities operated by +- Mr. Singh. The water meter use for the ARCO AM/PM in Patterson was discussed with Mr. Huggins over the telephone. After some discussion, Mr. Huggins indicated that 3,000 dor less would probably be an accepta ble nurnr. Mr. Huggins requested a report describing the `+ proposed project be prepared for his department's review. 8.0 SEWAGE DISPOSAL SYSTEM AND DISPOSAL FIELD AREA Currently in San Joaquin County, we understand that there are only a hand full of operating �. package treatment systems. Based on our conversations with the EHD, EHD staff are satisfied with the two MicroSepTec Systems currently operating. We have heard that there are some "issues"with some of the other types of systems. It is our offices opinion that the EHD may have some additional comfort if the proposed project were to use a MicroSepTec System though other types of systems such as Orenco and Seven H have been installed in the County as well. The sewage treatment system manufacturers can provide performance information regarding their systems. EHD has not provided any specific treatment levels or water quality goals for the project. A treatment level achieved by several example projects by MicroSepTec reduced constituents to <10 mg/L-N -+total nitrates, <10 mg/L CBOD5 and 10 mg/L TSS (http://www.rnicroseptec.com/images/pdfs/professionalengineerspresentation.pdf_). One potential option discussed for a sewage disposal system would be to install two 1,500 gpd MicroSepTec Systems in parallel which could potentially treat a total of 3,000 gpd waste water. To minimize the waste w_a u_disps d_fig14,the upper twofeet of reladv_ely slowly percolating soils could be r ed. Below the surface soils, the percolation rate was found to be less than 5 minutes per inch, as shown in Table 3. The EPA design manual for onsite wastewater treatment systems recommends 2,500 square feet of disposal area based on an application rate of 1.2 gpd/ft' and a percolation rate of 1 to 5 minutes per inch(see table 7-2, Page 214, EPA, 1980). The San Joaquin County Environmental Health Department Sewage Standards indicates that a filter bed area of 2,520 square feet should dpi RaD r s r,+ r � r • *sSOG�