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ERCIVEDE 3330 Data Driveelta S to 100 1rrv�rnnmentai Rancho Cordova CA 95670 1' Iggg 916 638 2085 FAX 915 638 8385 F-NYIRPif�MEi ,IiAk � I Iy! PERM 11/SERVI r,r-S February 19, 1993 Ms Mary Meays San Joaquin County Public Health Services Environmental Health Division 445 North San Joaquin Street Post Office Box 2009 Stockton, California 95201 Subject Quarterly Ground Water Monitoring Letter Report First Quarter 1993 4491 West Durham Ferry Road/15j . Tracy, California Delta Project No 40-91-732 Dear Ms Iveays Delta Environmental Consultants, Inc (Delta), at the request and authorization of Ms Stella Ruiz, has conducted ground water monitoring activities at the subject site This letter report presents the results of site monitoring in the first quarter of 1993 The site location is shown in Figure i and site features are shown in Figure 2 Once during each quarter in 1993, ground water table measurements will be collected During the first and third quarters, a water sample will be collected from monitoring well MW-1 only, during the second and fourth quarters, ground water samples will be collected from monitoring wells MW-1, MW-2, and MW-3 Ground Water Table Elevations,Flow Direction and Hydraulic Gradient Ground water table elevations were measured in monitoring wells MW-1, MW-2, and MW-3, on January 7, 1993 Depth to water in the monitoring wells ranged from approximately 15 to 16 feet below the tops of the well casings Liquid-phase petroleum hydrocarbons were present in monitoring well MW-1 at a thickness of 1 11 feet Water table elevations are summarized in Table 1 The ground water table elevations measured on January 7, 1993, were used to construct a water table contour map, included as Figure 3 The inferred water table contours illustrated in Figure 3 indicate that ground water at the site was flowing toward the northeast with a hydraulic gradient of approximately 0 001 Delta Delivers Solutions