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1-12 OGEOL : A GROUND NATER CONSUI IANCI - t P O Box 2165 ■ Livermore, Califomia 94559 ■ (925)373-9211 - r� Local Oversight Program March 30, 2001 - San Joaquin County Department of Health Services P O Box 2009 Stockton, CA 95201 RE Fust Quarter, 2001 Groundwater Monitonng Report - Underground Storage Case Former Cheapen #37, 15 Grant Line Road, Tracy, San Joaquin County Dear Local Oversight Program, This First Quarter, 2001 Groundwater Monitoring Report is submitted by HZOGEOL on behalf of The Customer Company for the former Cheapen Store #37, 15 Grant Line Road in Tracy, San Joaquin County, Cahfornia The site location is shown on Figure 1 and is now More for Less #37 • The Fust Quarter, 2001 groundwater monitoring event occurred on February 23-24, 2001 10 POTENTIOMETRIC SURFACE Depth to water in each monitoring well was measured to +/- 0 01 feet using a Sohnst Model water level meter between 08 50 and 09 10 on February 23, 2001 The depths to water were converted to potentiometnc surface elevation by subtracting the measured depths to water from the casing top elevations denved from the well survey performed in 1995 by Benchmark Consultants The depth to water, casing top elevations, and potentiometnc surface elevations are presented in Table 1 All available previous water level measurements are summarized in Table C 1 in Attachment C Figure 2 is a map showing the approximate potentiometnc surface for the monitoring wells at tht site on February 23, 2001 Table 2 lists the slope (gradient) and direction of gradient of the potentiometnc surface for each of the triangles with a well at each apex The average gradient of the potentiometric surface was 0 0015 feet per foot The average gradient direction was oriented N 25 58°E All available previous potentiometnc surface slope (gradient) and direction of gradient are summarized in Table C2 in Attachment C