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[4] Cont. <br /> is our opinion that it is an anomaly. Although this 9 min/in rate <br /> translates to a 6, 000 square foot leaching area, we are <br /> recommending that a 12 , 000 square foot leaching area be utilized <br /> for any future development. Additionally, the leach line should <br /> be placed as close to grade as possible (6 inches minimum depth) <br /> to create the greatest possible evaporation of effluent. <br /> [5] LOCAL GROUNDWATER AND SURFACE WATER INFORMATION <br /> Groundwater was encountered at boring termination of 20 ft. <br /> Historical groundwater data indicates that the water table has <br /> risen to a depth of 8 ft in the recent past, most notably in 1983 . <br /> The map of "Lines of Equal Elevation of Water in Wells - Spring <br /> 199111 , produced by the San Joaquin County Flood Control District <br /> indicates the water table at 50 ft. This corresponds with the <br /> Tentative Map which indicates the subject property is at an <br /> elevation of 70 ft above sea level, thus signifying a shallow water <br /> table depth of 20 ft. <br /> 4 A water sample was taken from an irrigation well, 350 ft to the <br /> east of the percolation test borings. The analytical results are <br /> located in the Appendix, and reveal a median nitrate concentration <br /> level of 26 ppm. The maximum contaminant level for nitrates is 45 <br /> ppm. It can be concluded that there has been some impact upon the <br /> underlying groundwater with regard to nitrates from agricultural <br /> influences. <br /> With regard to surface waters in the study area, there is an <br /> irrigation lateral that traverses the east side of Bird Road, near <br /> the subject property. Additionally, there is of course a <br /> tremendous amount of surface irrigation, primarily flood <br /> irrigation. Irrigation practices and locations should be taken <br /> into consideration in the design of the septic system. <br /> 3 <br /> 6) Q..Iiky <br /> (Vontrol Inspection <br />