Laserfiche WebLink
R603 UPDATE-29 6/07/94 <br /> 1 . 0 INTRODUCTION <br /> This update, STATUS UPDATE #29, presents data from April 26, <br /> through May 24 , 1994, collected at the site on April 28, and May <br /> 19 & 24, 1994, see Appendix A - Field Notes . Since the system <br /> repairs that were completed on February 1, 1994 the system has <br /> operated 100% <br /> The permit to dump treated ground water to the sewer has been <br /> renewed, see Appendix B. Presently we are batch dumping the <br /> treated water from the "ConVault" once it is full . This water is <br /> collected from the vapor recovery condensate dropouts and the <br /> water produced from the sampling and monitoring of the monitor <br /> wells by Lawrence Tank Testing (LTT) pumping service. We are <br /> presently evaluating the need for a continuous pump and treat <br /> system If it is determined that continuous pumping of ground <br /> water is needed; monitor wells MW2 and MW3 will be continuously <br /> pumped <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 /> 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 May 19, 1994 , <br /> represents ground water gradient under the influence of vapor <br /> V n V ✓ .. r ssio..na; —4—red niLe\nrP: <br /> extraction and Srrr✓ apturinrn —Fr L <br /> MW10 and MW3 . Vapor extraction is being concentrated on MW2, MW3 <br /> and MW10 , see Figure 4 <br /> GROUND WATER QUARTERLY SAMPLING <br /> Ground water samples were collected on March 4 and 29, 1994 see <br /> Table 1 These samples were collected by a WEGE Geo-technician <br /> and "Chain of Custody" delivered on ice to State certified <br /> testing laboratorys (SUPERIOR PRECISION ANALYTICAL, INC. DHS <br /> 41332 and AMERICAN ENVIRONMENTAL NETWORK, INC. DHS #1172) for <br /> PAGE 1 <br />