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4 � <br /> µY <br /> F discontinuous lenses of clay and silt which creace localiz-ad <br /> confinement (Calif. DWR, 1978% Olmsted et al . , <br /> 1961 ; USCG, <br /> 1981 , 1989 ) . <br /> 3.. 2 GROUND WATER <br /> The yearly fluctuations of around •,ater table elevations in <br /> this area vary widely. Information obtained from the San <br /> Joaquin County Flood Control and 14ater Conservation D'_strict <br /> 1' 1978, 1986 ) indicate ground water levels vary from 70 ft <br /> below ground surface in the spring of 1978 (following two dry <br /> years ) to 35 ft subsurface in the spring of 1986 (an extremely <br /> wet year ) . <br /> A rel_ located approximately 1 , 000 yards south of the site, at <br /> the Cerri Feed Store, was drilled to a depth of 160 ft in June <br /> �:..9 of 1973 . At that time ground water was encountered at 68 .ft. <br /> The 6 inch well was screened from 190 feet . to 160 feet <br /> sealed to the surface_ ( San Joaquin Local Health District, <br /> personal communication ) . The direction of regional ground <br /> water flow also varies, but is generally to the east (San <br /> =, <br /> in the vicinity <br /> Joaquin Flood Control District, Spring, 1986 ) <br /> of the facility. <br /> x <br /> J <br /> 3 . 3 SURFACE WATER <br /> Er As shown in Figure 3-1 , surface waters in the area of the <br /> t:a Rainbo Baking Company facility are Duck Creek and Walker <br /> � s Slaugh. Duck Creek runs south of the property enol drains into <br /> y;N Walker Slough, which is approximately 1-•1/4 miles to the <br /> southwest of Rainbo facility. A tributary to Duck Creek runs <br /> f ` north--south, near the western boundary of the property and . <br /> similarly drains toward the south and Duck Creek. inother <br /> drainageway, to the north,' flo'as toward the northwest, <br /> y in the <br /> draining toward this north-south tributary. Topograp'n <br /> area indicates a general surface water glow direction trending <br /> 6. <br /> 3-2 <br />