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N M_ <br /> As discussed above in Section 1 .2.2, groundwater gradient direr- <br /> tions were calculated from the <br /> gauging data in Table 2 using the <br /> three-point method (Billings 1972), or by contouring the well <br /> elevations. Figure 7 and Figures C-1 through C-9 show the <br /> results of the gradient calculations for the last two years. <br /> The data indicate a groundwater gradient direction toward the <br /> northeast. <br /> The nearest surface water is a channelized, intermittent tribu- <br /> tary of. the west-flowing Fivemile Creek, which passes within 100 <br /> yards of the site (Figure 3 ) . Fivemile Creek carries surface <br /> runoff westward to the waters of the San Joaquin. River system. <br /> Flow in Fivemile Creek may contribute to recharge .of the shallow . <br /> aquifers beneath the site during periods of precipitation. <br /> is <br /> 2-2.3 Nearby Water Supply <br /> A search of the California Department of Water Resources well <br /> records in. Sacrantento has .revealed the locations of 1,.5 wells <br /> within <br /> approximately 2,a0o feetof the-.site. Information eon <br /> cernzng'the ownership and location of the wells is listed, in - <br /> Table 7, and the locations of the °e11s are shown in Figure 3. <br /> r Fi ; :Ys <br /> Mr. D• Cox of thea Stockton Public Utilities Di,trict .has con <br /> (. <br /> firmed the locations of the two municipal wElls found in iche .DWR <br /> records. Mr. Cox also .indicated thatall..housin alon <br /> g g Paloma <br /> Avenue and E1 Camino . <br /> Avenue between' Thornt�sn road and Lower <br /> Sacramento Road (Figure 3) is outside :an organi.zed_-water=distr <br /> - <br /> buf:ion <br /> i <br /> sXstem and is dependent on:. well .atcr. Mr. pox estim«Led. <br /> that there are' -50 .wells inthis area ( 1989 <br /> , pers. comm. ): <br /> „ 3 SITE HISTORY <br /> Former <br /> Exxon Retail Site 7-1050 was in operation on thete . <br /> from . least; 1967,until:: early 1986. The' service station was <br /> closed. after the product lines failed a ,ti <br /> `�-- ghtness test in <br /> .. <br /> r e35/71050/2-90/tx <br /> 13 <br /> t <br />