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INTRODUCTION <br /> This update, STATUS UPDATE 37 , presents data from February 8, <br /> through March 29, 1995 and includes the sewer discharge update, <br /> Quarterly Ground Water Monitoring and results of venting MW8 <br /> The permit to dump treated ground water to the sewer has been <br /> renewed Presently we are batch dumping the treated water from <br /> the "ConVault" whenever it is full The water for treatment is <br /> collected from the vapor recovery condensate dropouts and <br /> produced from the sampling and monitoring of the monitor wells <br /> by Lawrence Tank Testing (LTT) pumping service <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, 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 /> GROUND WATER MONITORING <br /> Depth to ground water measurments and water samples were obtained <br /> from all monitor wells on March 15, 1995 The vapor extraction <br /> was on at the time, therefore corrections to the measurements <br /> were necessary to compensate for reducing the atmospheric <br /> pressure at the well head <br /> Figure 4 , represents the measurements obtained on March 15, 1995 <br /> Ground water gradient shows a relatively flat flow to the east, <br /> with a cone of influence centered at MW3 <br /> GROUND WATER QUARTERLY SAMPLING <br /> Ground water samples were collected on March 15, 1995 see Table <br /> 1 These samples were collected by a WEGE Geo-technician and <br /> "Chain of Custody" delivered on ice to State certified testing <br /> laboratory, AMERICAN ENVIRONMENTAL NETWORK, INC DHS #1172 , for <br /> chemical analyses These samples were analyzed for TPH and BTEX <br /> concentrations using EPA Methods 8015/5030 and 602 respectively <br /> Since diesel has never shown up in the sample results, the <br /> samples obtained on 11/27/90 and later were analyzed using EPA <br /> methods 5030 and 602 for Total Fuel Hydrocarbons and BTEX The <br /> next quarterly sampling will occur in June, 1995 <br /> PAGE 1 R603 UPDATE-37 3/31/95 <br />