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25288 N Cherokee Lane Project No.2018-00018 Page 15 <br /> Based on this method,the average deep percolation of rain for the Lodi area is estimated to <br /> ' be 5.29 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-NR. <br /> 4.3 Current On-Site Sources of Nitrate <br /> ' There are currently no on-site sources of nitrate.The site is currently vacant land. <br /> ' 4.4 Future On-Site Sources of Nitrate <br /> 4,4.1 Quantity and Quality of Domestic Wastewater from Proposed Project <br /> ' The following discussion is for determining the long-term wastewater flow anticipated from <br /> the proposed single-family residence with three bedrooms. The wastewater flow of the <br /> ' proposed dwelling is incorporated into the subsequent nitrate loading analysis. The <br /> anticipated wastewater flow determined is not intended to be used for septic system design, <br /> because septic system sizing includes a peak use factor, whereas the numbers discussed <br /> ' herein are based on a long-term conservative measure of estimated effluent volume. <br /> Per San Joaquin County Environmental Health requested guidelines based on previous <br /> ' nitrate loading studies, an average daily flow of 140 gallons per bedroom per day is <br /> estimated for the site. The following table presents the nitrate contributing septic <br /> wastewater flowrates anticipated for the site. <br /> ' Table 2. <br /> ' <br /> Typical Quantity of Effluent <br /> Average <br /> Quantity Days of <br /> ' Category Total per Use per Average Daily Flow <br /> Bedrooms Bedroom Year Per Facility <br /> per Day <br /> ' (gal) -- <br /> Proposed Dwelling (140 gallons per bedroom per day <br /> Main House-3 3 140 365 x 3 bedrooms x 365 days)/365 <br /> ' Bedroom days=420 gal <br /> '140 gallons per bedroom per day is based on EHD request with previous studies <br /> tTOTAL AVERAGE GALLONS PER DAY 420 gallons <br /> RESIDENTIAL 420 allons <br /> ' For the site, the total daily wastewater quantity is 420 gallons per day. The average total <br /> nitrogen concentration of domestic wastewater is normally considered to be 20-85 mg/L-N <br /> ' with 35 to 45 mg/L-N being typical9. During previous studies, EHD has requested a <br /> a Hantzshe N., Finnemore, E.J., 1992. Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground Water,Vol 30, No 4. <br /> ' 9 Crites, R.T.G. 1998. Small and Decentralized Wastewater Treatment Systems. <br /> Petralogix Engineering,Inc <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)A00­5729 <br /> w ,petraloglx.com <br /> 1 <br />