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• i 3330 Datas Dave DeltaC- 7 �ii baa a t 1 016638 20LA 95610 � _� aranmenta 016638 708585 - °' ` - FAX 9'6 638 8385 September 7, 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, Third Quarter 1993 4491 West Durham Ferry Road Tracy, California Delta Project No 40-91-732 Dear Ms Meays DeIta 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 third quarter of 1993 7-be site location is shown in Figure 1 and site features are shown in Figure 2 During each quarter in 1993, ground water table measurements are collected During the first and third quarters, a water sample is collected from monitoring well 11AW-1 only, during the second and fourth quarters, ground water samples are collected from monitoring wells MW-1, MW-2, and MW-3 During this quarter, ground water table measurements were collected However, a sample was not collected from monitoring well MW-1 because a sheen of petroleum hydrocarbons was observed 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 July 16, 1993 Depth to water in the monitoring wells ranged from approximately 13 5 to 14 5 feet below the tops of the well casings Water table elevations are summarized in Table 1 The ground water table elevations measured on July 16, 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 north with a hydraulic gradient of approximately 0 001 Delta Delivers Solutions