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rFNw.= 60mg N/L <br /> sume 25% due to high percentage of fine-grained clay soil in upper sail profile. <br /> R = lin/yr. 1 <br /> N,,= Assumed to//be 0.1 ppm NO,-N <br /> +I/,,,,0 Y 0. <br /> fl1V 1.00 in/yr(60 mg N/L) (1 -0.25)+(15 in/yr x 0.1 mg/.L) 7,1 <br /> Nr = (1.00 in/yr+ 15 in/yr) <br /> l(� <br /> Nr 9.9P <br /> in as nitrate-nitrogen (NO3-N) or 13 ppm as nitrate(NO,) <br /> C. SEPTIC SYSTEM OPERATIONAL PARAMETERS AND COMPONENTS <br /> SSS§ 3.7. Discussion of efficient operation, disposal field longevity, and environmental protection <br /> are based upon the environmental parameters discussed within this Report. Calculations and a <br /> description of the wastewater management system structures to be constructed is as follows, and is <br /> I <br /> based upon the EHD Sewa&ee Standards. <br /> SEPTIC TANK <br /> F <br /> Septic tanks store the accumulated sludge, scum and effluent(clear zone)volumes, which in turn affect <br /> treatment of nitrogen within the tanks. 1 <br /> Detention Time Calculation: <br /> Detention Time=2,000 gal total tank capacity x 0.90(l0%volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking factor) x 1,250 MAX gals/day(ADF) <br /> r8�5 <br /> Detention Time= 1.0 days. The minimum acceptable detention time is 1.0 day. However, given the fact <br /> that assigning 10 gallons wastewater production per person is exorbitantly high,the maximum daily flow <br /> that may occur on any given Saturday or Sunday may be closer to allowing two gallons for restroom use and <br /> two gallons for each person for kitchen use for a total of 4 gallons per person x 125 people= 500 gallons. <br /> Detention time thus equals 2.4 under this scenario and would be greater since there will be no flows during C�v� <br /> the week. Therefore, in my professional opinion, a 2,000 gallon septic tank is suitable for sufficient <br /> detention time. This also allows for greater time for nitrogen decomposition, which was not introduced into <br /> the nitrate loading calculations as a safety factor. <br /> LEACHLINE REQUIREMENT EXAMPLE CALCULATION BASED ON SAN JOAQUIN <br /> COUNTY SEWAGE STANDARDS FOR COMMERCIAL SEPTIC SYSTEMS: <br /> Base Tank Capacity= 1,200 gals (always 1,200 gals). Since the greatest maximum daily flow will occur on <br /> either weekend day at 1,250 gpd,the system must be adequate to manage these flows. <br /> Leachline Equivalent Requirement= 1,200 gallons BTC+ 1,250 MAX ADF x 0.250 clay Soil Factor(SF)_ <br /> 615 lineal feet of leachline(LFLL) required. ' <br /> 10 <br /> Chesney Consulting <br />