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R603 UPDATE-19 8/24/93 <br /> 1. 0 INTRODUCTION <br /> This update, STATUS UPDATE #19, presents data from June 28, <br /> through July 29, 1993 collected at the site on July 19 and 29, <br /> 1993 On July 29, 1993 the REMOX Thermal Oxidation Unit was <br /> turned off and a heat exchanger was installed to preheat the <br /> vapor stream allowing for less 02 and natural gas agumentation. <br /> Lawrence Tank Testing (LTT) was also performing once a week <br /> purging of selected wells for ground water removal and treatment . <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 twice weekly purging of <br /> monitor wells MWl, MW2 , MW3 , MW8 and MW10 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 /> MWl and MW3 will be continuously pumped There was no sewer <br /> discharge during the month of July, 1993 , see Appendix A - Sewer <br /> Discharge Report <br /> LOCATION <br /> The station is located at 6425 Pacific Avenue at the intersection <br /> of Douglas Road, in San Joaquin County, Stockton, California <br /> The site lies in Section 21, T2N, R6E, 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 Starting on December 1, 1992 , LTT has been <br /> performing twice a week purging of monitor wells MW1, MW2 , MW3, <br /> MW8 and MW10 . The twice a week well purging has been reduced to <br /> once a week in May, 1993 , see Table 5 and Appendix B. See <br /> Figures 4A - June 14, 1993 and 4B - July 19, 1993 for ground <br /> water gradient interpretations . <br /> PAGE 1 <br />