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R603 UPDATE-28 5/24/94 <br /> 2. 0 INTRODUCTION <br /> This update, STATUS UPDATE #28, presents data from March 29, <br /> through April 26, 1994, collected at the site on April 3, and 26, <br /> 1994, see Appendix A - Field Notes and Certified Laboratory <br /> Reports . Since the repairs, completed on February 1, 1994 , the <br /> system has operated at 1001 . <br /> The permit to dump treated ground water to the sewer was received <br /> and presently we are batch dumping the treated water from the <br /> "ConVault" monthly. This water is collected from the vapor <br /> recovery condensate dropouts and the water produced from the <br /> sampling and monitoring of the monitor wells by Lawrence Tank <br /> Testing (LTT) pumping service We are presently evaluating the <br /> need for a continuous pump and treat system If it is determined <br /> that continuous pumping of ground water is needed; monitor wells <br /> MW1 and MW3 will be continuously pumped, see Appendix B - Sewer <br /> Discharge Report <br /> LOCATION <br /> The station is located at 6425 Pacific Avenue at the .intersection <br /> of Douglas Road, Stockton, in San Joaquin County, California <br /> The site lies in Section 21, T2N, RGE; MDB&M at approximately 12 <br /> feet above mean sea level (MSL) (see Figures 1, 2, 3 ) The <br /> parcel is # 31 and can be located in Assessor' s Book 97 on page <br /> 41 (97-041-31) On October 2, 1992, a licensed surveyor with <br /> Nolte & Assoc . surveyed all monitoring well locations and top of <br /> casing elevations to a known datum, ie City of Stockton Bench <br /> Mark Number 12 , elevation 11 . 74 ' above mean sea level <br /> 2 . 0 GROUND WATER <br /> LOCAL GROUND WATER FLOW <br /> Ground water flow direction in this region is to the west and <br /> towards south Stockton from the foothills of the Sierra Nevada <br /> Mountain Ranges, and towards the east from the Sacramento-San <br /> Joaquin Delta At present, encroachment of saline waters from <br /> the Delta is impairing the quality of the ground water in the <br /> Stockton area. Vapor extraction has created a ground water <br /> potentiometric low (an apparent mounding) beneath the site near <br /> MW2 , MW3 and MW10 Measurements obtained on April 26 , 1994 , <br /> represents ground water gradient under the influence of vapor <br /> extraction. Vapor extraction is being concentrated on MW2 , MW3 <br /> and MW10, see Figure 4 . <br /> Currently the ground water is in a continuation of a recharge <br /> cycle produced from the Winter of 1993/1994 precipitation, see <br /> Depth to Water measurements on Table 1 . As would be expected, <br /> changes in vacuum at the wells influences the shape of the <br /> Potentiometric surface . <br /> PAGE 1 <br />