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= 1 yr. <br /> Nh = Assumed to be 0.1 ppm NO3-N <br /> 0.15 in/vr(103 mg N/L) (1 - 0.10)+Q3 in/yr x 0.1 mg/L) <br /> Nr = (0.15 in/yr+ 13 in/yr) 7 <br /> Nr = 1.2 ppm as nitrate-nitrogen (NO3-N) or 5.3 ppm as nitrate (NO3) <br /> C. SEPTIC SYSTEM COMPONENTS BASED ON EHD SEWAGE STANDARDS <br /> The septic system components and parameters for this parcel are based upon the factors of <br /> operation, longevity, and environmental protection, which are all in accordance with the San <br /> Joaquin County Environmental Health Department Sewage Standards. Of significance is Section <br /> 8.8.6 of the Standards which states: At least 60% of all septic system structures must be in leach <br /> lines except in hardpan/clay soils. <br /> SEPTIC TANK <br /> Septic tanks affect the sludge, scum and effluent volumes, which in turn affect treatment of <br /> nitrogen within the tanks. Typically,the volumetric capacity of septic tanks serving commercial <br /> facilities should be equal to approximately 5 times the average daily flow(ADF or QAvE). In the <br /> following example, a pump-out interval of three years has been used in the calculations. The <br /> peaking value is normally taken to be 1.5 for commercial projects. <br /> SEPTIC TANK CAPACITY EXAMPLE: <br /> Recommended tank capacity for a pump out interval of three yrs: 2.8(QAVE)x Peaking Factor (PF) <br /> =2.8(4 people x 30 gals/day = 120 gals/day)x 1.5 = 504 gal tank capacity required: <br /> Use one - 1,200 gallon tank with effluent filter. <br /> DETENTION TIME EXAMPLE: <br /> Detention Time= 1,200 gal tank capacity x 0.70 (30%volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking factor) x 120 gals/day <br /> Detention Time=4.7 days. The minimum acceptable detention time is 1.0 day. <br /> LL <br /> Page -7- <br /> Ch mq Consulting <br />