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1 <br /> R603 UPDATE-23 12/27/93 <br /> F <br /> 1.0 INTRODUCTION � <br /> This update, STATUS UPDATE #23, presents data from November 5 <br /> through 30, 1993 collected at the site on November 5, 17 and 30, <br /> 1993 . On November 4 and 5 1993 the <br /> ' pilot/burner assembly � <br /> replaced in the REMOX Thermal Oxidation Unit . The unit was <br /> restarted on November 5, 1993 and the vapor influent stream <br /> adjusted to 15 . 516 02 . i <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 j <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 /> f MW1 and MW3 will be continuously pumped, see Appendix A - Sewer <br /> Discharge Report . <br /> LOCATION <br /> The station is located at 6425 Pacific Avenue at the intersection r <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 i <br /> Mark Number 12, elevation 11 . 74' above mean sea level . <br /> 2 . 0 GROUND WATER <br /> LOCAL GRQUND 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 i <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 /> MW1, MW2, MW3 and MW10 . Measurements obtained on November 5, <br /> 1993 show a return to a near normal flow direction prior to <br /> restarting the vapor extraction system, see Figure 4 . <br /> Currently the round water is in a continuation of a recharge <br /> ge <br /> i <br /> cycle produced from the Spring of 1993 percipitation, see Depth <br /> to Water measurements on Table 1 . As would be expected, changes <br /> in vacuum at the wells influences the shape of the potentiometric ! <br /> surface. <br /> Figure 4, November 5, • 1993 shows what is assumed a normal � <br /> gradient direction for this site. Measurements were obtained <br /> PAGE 1 <br />