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R603 UPDATE-22 11/11/93 <br /> 1.0 INTRODUCTION <br /> This update, STATUS UPDATE #22, presents data from September 29, <br /> through November 5, 1993 collected at the site on September 29, <br /> October 6, 14, 27, November 1, 4, and 5, 1993 . On November 4 and <br /> 5, 1993 the REMOX Thermal Oxidation Unit had the pilot/burner <br /> assembly replaced The unit was restarted on November 5, 1993 <br /> and the vapor influent stream adjusted to 15 . 5's 02 . <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 A - 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 low <br /> (cone of depression) beneath the site near MW1, MW2 , MW3 and <br /> MW10 Measurements obtained on NnvpmhPr c� i oQi sh., �.,,}. ..... �.. <br /> --, —���.+ waav rr Q 1GV1.1111 4V <br /> a near normal flow direction prior to restarting the vapor <br /> extraction system, see Figure 4B Figure 4A represents <br /> potentiometric ground surface during vapor extraction on <br /> September 29, 1993 . <br /> Currently the ground water is in a continuation of a recharge <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. This is noticeable in comparing the two ground water <br /> gradient figures supplied in this report <br /> PAGE 1 <br />