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4 Ground Water Dep nd Gradient <br /> It appears that the aquifer providing the primary water source in the area lies <br /> k <br /> a <br /> at a.depth of approximately 110 feet below the surface. However, Oakdale <br /> Irrigation district wells are much deeper—from 400 to 500 feet and <br /> undoubtedly also tap water-bearing units lower in the stratigraphic section. <br /> The piezometric surface of the ground water table slopes to the north, away <br /> from the Stanislaus River which lies approximately eight miles to the south. <br /> Because of the deep ground water depth, it is difficult to determine seasonal <br /> variations in ground water elevation. However, Oakdale Irrigation District <br /> reported that the water levels vary only about three_ are actively <br /> The lowest levels <br /> occur during the summer months when irri anon wells <br /> g pumped. <br /> Ground Water Sam li <br /> P ng <br /> Five water supply wells in the vicinity were sampled to determine the <br /> baseline concentrations of nitrate and total dissolved solids. DBCP and EDB <br /> was also determined for three of the wells. The wells that were sampled were <br /> as follows: <br /> On site well (sample TVW-4) in the SW 1/4 of Section 10, T. I S., R. 9 E. <br /> Downgradient OID irrigation well (sample TVW-5) located at the common <br /> corners of Sections 3 4 9 & 10 T. <br /> I S., R. 9 E <br /> Upgradient private well at the Taro ranch (sample TVW-3) located in the NW <br /> 1/4 of Section 14, T. I S., R. 9 E <br /> Cross gradient well (sample TVW-1) located at the Eck residence, located in <br /> the SW 1/4, SETA, Section 15, T. 1 S., R. 9 E. <br /> Cross gradient well (sample TVW-2) located on the Trimble ranch, in the <br /> SW 1/4, SE 1/4, Section 11, T. I S., R. 9 E.. <br /> Water samples from these five wells were transferred under chain of custody <br /> to A & L Western Agricultural Laboratories in Modesto, where they were " <br /> analyzed for nitrate and total dissolved solids. Samples from TVW-3,4 & 5 <br /> were also analyzed for total and fecal coliform, calcium, magnesium, pH, <br /> total hardness, electrical conductivity, EDB and DBCP. <br /> Reference map at appendix III A for locations. <br /> Reference appendix III B, 1-3 for test results. I' <br /> 27 �. l <br />