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r2 B. LEACHLINE AND.,FILTER BED REQUIREMENTS EXAMPLE CALCULATION BASED ON SAN JOAQUIN COUNTY SEWAGE STANDARDS FOR COMMERCIAL SEPTIC SYSTEMS: Base Tank Capacity = 1,200-.gal. Since the greatest anticipated daily flow will occur on Sundays at 1,035 gpd,the disposal-system must be adequate to manage the anticipated maximum flows on. this day. Leac lig EquivalentRequirement= 1,200 gallons BTC + 1,035 ADF x 0.250 clay Soil Factor (SF) 560 ineal feet of leachline (LFLL) required. Filter Be Requirement: , 3 560 L x cla ovs)�2�40 sq ft. Primary disposal area designated on the Site Plans to =248 ft x 96.5 ft "2,702.sq ft-- a 17% increase in disposal area over the calculated rerea. Th -eeon�la dis osal area (100% Replacement Area) is also designated to q ?'3' p be the same area at 2J02q ft. The filter bed should be installed as high in-elevation as possible to take advantage of evapotranspiration. flan and elevational dimensional views of the filter bed as proposed are found in Appendix A. The proposed-operation of the wastewater management system is as follows: Graywater from sinks and floor drains, and blackwater from toilets will flow into a 2,000 gallon, single compartment septic tank. An effluent filter must be installed on the outlet-tee. Effluent will gravity flow south'to a distribution.box (D-box) of the north-center of the primary filter bed. The D-box must be level and installed with"speed-levelers"to achieve.optimum effluent distribution_. Equalized effluent-flow will gravity flow south into two separate tight Lines, which should be installed as level as possible. 'Effluent will then gravity flow east into three, four-inch diameter perforated pipes, and west into three, four-inch diameter.perforated pipes. This piping orientation will create what is referred to.as a"center feed" manifold system to theoretically create a more equal distribution of the effluent.over the floor of the filter bed. V. CONCLUSIONS;- RECOMMENDATIONS, MONITORING AND MAINTENANCE SSS§ 5.4,SSS§ 6.7. The soils underlying the proposed filter bed disposal area for the propose_d Tracy Islamic Center show acceptable permeability that can be considered exceptional-for the short-term. For the long-term acceptance rate,the permeability of the soils will slow, but not to the extent that would be found with a project of higher organic matter loading from blackwater wastes and kitchen/food production. Given'the historical evidence of:the repairs/repl'ace'ments/additions to surrounding septic systems, longevity of the proposed system may not be as great as in other areas of the County. However, biomat formation should be very slow because of the anticipated low concentration of biological.organic material within the effluent. 15 Chesney Consulting