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l� 3330 Data Drive Oahsuile Rane 100 l/ y Ranc�o Cordova CA 95674 �n%,ranmenta 916 638 2085 Z' FAX 916 638 8385 May 7, 1993 Ms Mary Meays San Joaquin County Public Health Services Environmental Health Division 445 North San Joaquin Street Post Office Box 20W Stockton, California 95201 Subject Quarterly Ground Water Monitoring Letter Report Second Quarter 1993 4491 West Durham Ferry Road Tracy, California Delta Project No 40-91-732 Dear Ms Meays 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 second quarter of 1993 The site location is shown in Figure 1 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 April 7, 1993 Depth to water in the monitoring wells ranged from approximately 15 to 15 feet below the tops of the well casings Liquid-phase petroleum hydrocarbons were present in monitoring well MW-1 and MW-2 at a thickness of 11 and 20 feet, respectfully Water table elevations are summarized in Table 1 The ground water table elevations measured on April 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