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Ery ENVI ?Qrti� _ KNTAI, 11F.A1 TH LF GROUNDWATER❑ PERMIT/4057 Port TECHNOLOGY, INC. Chicago Highway,Concord,CA 94520(415)671-2387 FAX:(415)685-9148 March 18, 1993 Project No. 020203767 Mr. Bob Vasquez The Southland Corporation 5820 Stoneridge Mali Road, Suite 310 Pleasanton, California SUBJECT: Quartet' Monitoring and Sampling Activities Southland Site No. 20304 455 Grant Line Road Tracy, California I Dear Mr. Vasquez: Groundwater Technology, Inc. presents the attached quarterly groundwater monitoring and sampling data collected on December 28, 1992. This work was performed under Southland Environmental Work Order No. 20304-5. Groundwater Monitoring On December 28, 1992, the depth to water and the depth to separate-phase hydrocarbons, if present, were measured in 14 groundwater monitoring,wells before well purging and groundwater sample collection. Separate-phase hydrocarbons were not detected in any of the monitoring wells. The water- table elevations calculated from the December 28, 1992, monitoring data were used to prepare a potentiometric surface map (Attachment 1, Figure 1). Wells MW-9 and MW-10 are screened into a shallower water-bearing zone. Because wells MW-9, MWA0, and MWA 1 had repeatedly shown ground- water elevations different from those in-the surrounding wells, they were not used to calculate the potentiometric groundwater surface. The potentiometric surface elevation as measured in the ground- water monitoring wells increased an average of 1.1 feet since the September 21, 1992, monitoring event. The groundwater flow direction is toward the north-northeast with a hydraulic gradient of approximately 0.009 foot per foot (ft/ft). The historical and current water-level measurements are presented in Attachment 2, Table 1. R3767A1.MK 1 Offices throughout the U.S.,Canada and Overseas �T�H