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TABLE 3 <br /> PRECIPITATION AND ETo DATA FOR MANTECA CIMIS STATION #70 <br /> Month Monthly Precipitation ETo Average Potential Deep Percolation <br /> (Avg.2015-2019) (Avg.2015-2019) (in/mo) <br /> (in/mo) (in/day) <br /> January 2.65 1.12 0.04 1.53 <br /> February 1.12 2.11 0.08 -- <br /> March 1.79 3.5 5 0.12 -- <br /> April 1.43 4.28 0.14 <br /> May 0.49 6.67 0.22 -- <br /> June 0.18 7.87 0.26 -- <br /> July 0.00 8.26 0 27 -- <br /> August 0.01 7.12 0.23 -- <br /> September 0.06 5.23 0.17 -- <br /> October 0.56 3.67 0.12 -- <br /> November 1.44 1.88 0.06 -- <br /> December 1.95 1.28 0.06 0.67 <br /> TOTALS(in.) 11.68 53.0 ------ 2.21 <br /> This data illustrates a relatively high potential for there to be significant evapotranspiration from the <br /> wastewater disposal system design that takes advantage of evapotranspiration during the favorable months <br /> of March through October. <br /> NITRATE LOADING STUDY FINDINGS <br /> WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> To determine nitrate-nitrogen loading from any project,wastewater flow volumes must be determined as <br /> accurately as possible. Domestic flow volume projections are typically approximated from the USEPA <br /> Onsite Wastewater Treatment Systems Manual, Pg. 3-4. However,the EHD now specifies residential <br /> (domestic)flow volumes to be assigned 100 gallons for the first bedroom and 50 gallons for each additional <br /> bedroom. The following calculations summarize the wastewater flow volumes projected for the subject <br /> property: <br /> Ms.Vierra's existing house has one bedroom: 100 gals/day <br /> Her son's house has three bedrooms: 100+50+50=200 gals/day <br /> Ms.Vierra's proposed house will also have three bedrooms and a toilet/sink in the pool cabana(counted as <br /> one bedroom): 100+50+50=50=250 gals/day <br /> Total wastewater flow volumes from the subject Parcel=550 gals/day. <br /> Page-4JJ <br /> - <br /> Chesney Consulting <br />