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R603 UPDATE-26 2/28/94 1. 0 INTRODUCTION This update, STATUS UPDATE #26, presents data from February 2, through February 21, 1994, collected at the site on February 2, 10, 16 and 21, 1994 On November 4 and 5, 1993 the pilot/burner assembly was replaced in the REMOX Thermal Oxidation Unit . The unit was restarted on November 5, 1993 and the vapor influent stream adjusted to 15 .51 02 . The system operated 1001 until December 12, 1993, when mechanical shut down occurred. An attempt to restart the system occurred on December 22, 1993 . The system was restarted, after repairs were made on February, 1, 1994 . The permit to dump treated ground water to the sewer was received and presently we are batch dumping the treated water from the "ConVault" monthly. This water is collected from the vapor recovery condensate dropouts and the water produced from the sampling and monitoring of the monitor wells by Lawrence Tank Testing (LTT) pumping service We are presently evaluating the need for a continuous pump and treat system. If it is determined that continuous pumping of ground water is needed; monitor wells MW1 and MW3 will be continuously pumped, see Appendix B - Sewer Discharge Report . LOCATION The station is located at 6425 Pacific Avenue at the intersection of Douglas Road, Stockton, in San Joaquin County, California The site lies in Section 21, T2N; R6E, MDB&M at approximately 12 feet above mean sea level (MSL) (see Figures 1, 2, 3 ) . The parcel is # 31 and can be located in Assessor' s Book 97 on page 41 (97-041-31) . On October 2, 1992 , a licensed surveyor with Nolte & Assoc . surveyed all monitoring well locations and top of casing elevations to a known datum, ie . City of Stockton Bench Mark Number 12, elevation 11 . 74' above mean sea level . 2 . 0 GROUND WATER LOCAL GROUND WATER FLOW Ground water flow direction in this region is to the west and towards south Stockton from the foothills of the Sierra Nevada Mountain Ranges, and towards the east from the Sacramento-San Joaquin Delta At present, encroachment of saline waters from the Delta is impairing the quality of the ground water in the Stockton area. Vapor extraction has created a ground water potentiometric low (an apparent mounding) beneath the site near MW1, MW2, MW3 and MW10 . Measurements obtained on December 22, 1993 were obtained when the vapor extraction system was off and represent a minor recharge event occurring beneath the site with flow towards MW2, see Figure 4A Figure 4B, represents ground water gradient the day following restart of the vapor extraction system. Vapor extraction is being concentrated on MW2, MW3 and MW10 . Figure 4B, shows the PAGE 1