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Septic Tank Hydraulic detention Time I Detention Time = 1,200 t,al septic tank capacity x 0.70 (30%volume lost to sludeelscum accumulation) j 2.5 (Peaking Factor) x 150 gals/day ADF Detention Time= 2.2 days. The minimum acceptable detention time is 1.0 days. Therefore, a 1,200 gallon septic tank is adequate. Primary and 100% Replacement Filter Bed Area The filter bed area is calculated in the procedure described in Section 8.7 of the San Joaquin Document 42-01-004: Calculation Requirements County Sewage Standards and EHD Docu 4 s for Commercial otic Systems: Base Tank Capacity (BTC) = 1,200 gals I Lineal Feet of Leachline (LFLL) = 1,200 BTC + 150 ADF x 0.225 Soil Factor based on clay loam soil, or a silty clay/clayey silt = 303 LFLL Filter Bed Area = 303 x_3,5 = 1,000 square feet;_ qtq 14fitetor of 3.5 is.used to nrlruluteJiher bed area since the c1Titent accepting soil is not sant (3)and not ckn- (4), bite rather u cltiv.loatn which IS it silt•clay-clan ey silt, and therefore given.cr factor 3.5. The primary filter be area is proposed to be rectangular in area: 10 ft x 100 ft = 1,000 sq. ft, and manifolded in the center,so that half the effluent is distributed 50 feet to the,north and 50 feet to the south. Therefore, each Infiltrator Chamber length will be 50 feet long. There will be three chambers on either side of the center manifold. The filter bed area may also correspond with the percolation test results. As referenced above, the application rate correlated with the shallow pere test results of 120 mpi translate to an application rate of 0.20 gals/ft`/day. Using the ADF of 150 gpd, we find: 150 gpd- 0.20 galstft-/clay = 750 sq. i ft. filter bed. Therefore, the filter bed size of 1,000 sq. ft. is adequate based on the test results obtained. i The 100% replacement area is directly south of the primary filter bed area, and is also to consist of 1,000 sq. ft. Equipment may be stored in this area; however, there can be no permanent fixtures, or underground utilities in this area. Wastewater Disposal System Parameters and Appurtenances Infiltrator Chambers: 34"x 75"x 12"; Filter Bed = 1,200" (100') + 75" = 16 Chambers x 3 rows= 48 Chamber Zabel or Orenco Filtration from septic tank to filter bed (EHD Requirement) As-Builts of entire system by installer after installation (EHD Requirement) Monitoring of soil/effluent interface with monitoring ports within the filter bed area with observation tubes: 4" PVC Tee at soil/effluent interface with a 4" riser flush with the grass surface and a screw- type cap, (EHD Requirement) Filter bed should be at grade with surrounding soil surface. Page -7- Chesney Consultirr,;