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xi 7� <br /> IH20GEOLt <br /> A GROUND NATER CONSULTANCY- <br /> P O Box 2165 s_ Livam$ore,California 94%1 i( 925)373-9211 <br /> Local Oversight Program December 27, 2000 <br /> San Joaquin County <br /> Department of Health Services <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE. Fourth Quarter, 2000 Groundwater Monitoring Report- Underground Storage Case <br /> Former Cheaper$ #37, 15 Grant Line Road, Tracy, San Joaquin County <br /> Dear Local Oversight Program; <br /> This Fourth Quarter, 2000 Groundwater Monitoring Report is submitted by HOGEOL on behalf <br /> of The Customer Company for the former Cheaper! Store#37, 15 Grant Line Road in Tracy, San <br /> Joaquin County, California. The site location is shown on Figure 1 The Fourth Quarter, 2000 <br />, 1 groundwater monitoring event occurred on October 19, 2000. <br /> 10 POTENTIOMETRIC SURFACE <br /> Depth to water in each monitoring well was measured to +/- 0 01 feet using a Solinst Model <br /> water level meter between 08 47 and 08.58 on November 19, 2000. The depths to water were <br /> converted to potentiometnc surface elevation by subtracting the measured depths to water from <br /> the casing top elevations derived from the well survey performed m 1995 by Benchmark <br /> Consultants The depth to water, casing top elevations,and potentiometrie surface elevations"are <br /> presented in Table 1 All available previous water level measurements are summarized in Table C1 <br /> in Attachment C <br /> Figure 2 is a map showing the approximate potentiometric surface for the monrtormg wells at the <br /> site on November 19, 2000. Table 2 lists the slope (gradient)acid direction of gradient of the <br /> potentiometnc surface for each of the triangles with a well at each apex. The average gradient of <br /> the potentiometnc surface was 0 0023 feet per foot. The average gradient diti�ctxon was oriented <br /> N 8 64°E <br /> All available previous potentiometnc surface slope (gradient) and direction of gradient are <br /> summarized in Table C2 in Attachment C <br />