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January 7,2003 Job Number:LG02-026 Page 6 Table 2. Estimated Average Daily Flow. Category Use People Sum Office Staff(5 15 gpd/person 37 37 persons * 15 gpd/person*5/7=396 gpd days/week) Customers(5 days/week) 5 gpd/person 5 persons * 5 gpd/person * 5/7= 18 gpd 2 bedroom caretaker 70 gpd I 1 person* 70 gpd/person=70 gpd house(7 days/week) X Avera e Daily 11o.,: 484 gpd �I gpd is gallons per day. �f —the factor 5/7 converts the average daily flow to a 5 day work week. The components of the septic system consist of a 1600 gallon and 2000 gallon septic tank used in parallel. The condition of the tanks are unknown. Jon Reed indicated there have not been any problems with the septic system. According to a method presented in the San Joaquin County Septic Standards, a calculation for a filter bed septic system was made to check whether the existing filter bed size is adequate. The following is the formula presented by San Joaquin County Septic Standard manual. Average Daily Flow(ADF) (Monday-Friday): = 484 gpd ADF(from Table 2) Use soil factor(SF)for silt andlorsandv clay loam: 0.200 (SF) Base tank capacity(BTC): 1200 gals. Calculated Tank Capacity (CTC): 1200 gals. (BTC) +484 gals. (ADF) = 1684 gal. (CTC) —the existing 1,600 gallon and 2000 gallon tanks in parallel should be adequate— Equivalent leach line (LL): 1684 gal. (CTC)x 0.200 (SF) =337 ft(LL) Filter Bed Multiplication Factor:3 or sandy soils_ Filter Bed Area: 337(LL)x 3 (factor) = 1010 sf(required area) Existing Filter Bed Area: 2 beds, 6.5 ft x 80 ft each = 1040 sf(existing area) According to the San Joaquin County Septic Standards method of calculating filter bed size, the existing filter bed septic system should be about the right size for the proposed use. However, the estimates presented do not allow for any additional use beyond those stated. There appears to be ample septic tank capacity. 3�- ? d'd u Y a � y3;