Laserfiche WebLink
September 3,2003 <br /> Job Number:LG03-226 <br /> Page 9 <br /> observed on the site,the denitrification factor is estimated to be about 15 percent. <br /> 7.6 Nitrate Loading Scenario <br /> One nitrate loading scenario was performed to determine the impact for all (3) approximately 12 <br /> acre parcels. The previously described assumptions were realized in the Hantzshe and <br /> Finnemore equation. The likely added contribution from future agriculture was not considered <br /> however it is expected to also contribute to some degree. <br /> Table 5. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Scenario Result Acres Average Effluent Leachfield Deep Percolation <br /> (Nc)* (A) Daily Concen- Denitrifi- of Rainfall(R) <br /> Flow(Q) tration cation(d) (Plate 1) <br /> L (fable 4) (Nw) <br /> r V� Standard Septic 4.7 mg/L-N 12 490 gpd 45 mg/L-N 15% 5.01 in <br /> LS tem(Plate 9) <br /> * Maximum contaminate level(MCL)for Nitrate in drinking water is 10 mg/L-N.Estimate does not include the <br /> contribution from agriculture. <br /> L As a result of the nitrate loading balance, the(3) 12-acre sites could contain a primary residence <br /> and a second dwelling unit. It is estimated that each parcel will not cause a build-up of nitrate <br /> above 10 mg/L-N over the long term. <br /> 8.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusion, a satisfactory percolation rate was achieved on all three parcels. No ground water <br /> was encountered in the borings and the depth to ground water, according to a recent San Joaquin <br /> L /il,�> County Flood Control and Water Conservation District ground-water map, is between 80-90 feet <br /> below the ground surface at the site. <br /> Based on the results of this study,we have found the soils to be suitable for a septic system <br /> consisting of leach lines and seepage pits for all three parcels. We believe that due to the <br /> proposed use and size of the parcels, the use of the septic system will not negatively impact the <br /> ground water quality of the area. <br /> r_ <br /> Y pE AS 1 <br /> L n <br /> Z ' <br /> ba <br /> O � <br /> �S•SpC♦ <br />