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r1 H20GEOL ; A CROUND WATER CONSULTANCY f P.O. Box 2185 ■ Livermore,Califomia 94551 ■ (925)373-9211 Local Oversight Program June 20,2001 San Joaquin County j Department of Health Services P.O. Box 2009 Stockton, CA 95201 RE: Second Quarter, 2001 Groundwater Monitoring Report- Underground.Storage Case Former Cheaper , ! #37 15 Grant Line Road,Tracy, San Joaquin County Dear Local Oversight Program; Second er,2001 Groundwater Monitoring Report is submitted by H20GEOL on behalf This Seco Quart , i of The Customer Company for the former Cheaper! Store#37; 15 Grant Line Road in Tracy, San Joaquin County, California. The site location is shown on Figure 1 and is now More for Less#37. The Second Quarter, 2001 groundwater monitoring event occurred on May 19, 2001. 1.0 POTENTIOMETR.IC SURFACE � Depth to water in each monitoring well was measured to +l- 0.01 feet using a Solinst Model water level meter between 10:46 and 10:53 on May 19, 2001. The depths to water were converted to potentiometric surface elevation by subtracting the measured depths to fie'from formed in 1995 by Benchmark the casing top elevations derived from the well survey perf tentiometric surface elevations are Consultants. The depth to water, casing top elevations, and po presented in Table 1. All available previous water level measurements are summarized in Table Cl in Attachment C. � Figure 2 is a map showing the approximate potentiometric surface for the monitoring wells at the t } . � site on May 19, 2001. Table 2 lists the slope(gradient) and direction of gradient of the potentiometric surface for each of the triangles with a well at each apex. The average gradient of po gradient direction was oriented the potentiometric surface was 0.0026 feet per foot. The average N 11.48°E. All available previous potentiometric surface slope(gradient) and direction of gradient are summarized in Table C2 in Attachment C. i i �