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R603 UPDATE-33 9/30/94 <br /> INTRODUCTION <br /> This update, STATUS UPDATE 33 , presents data from September 2 , <br /> through September 28 , 1994 Site visits were conducted on <br /> September 13 , 14 , 15 , and 16 , 1994 <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 The last batch <br /> dump occurred on December 22, 1993 of 800 gallons <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 /> VAPOR RECOVERY OPERATIONS AND RESULTS <br /> The original REMOX unit operated for a total of 14452 hours out <br /> of a total of 21048 hours (69%) As of September 2 , 1994 the new <br /> replacement unit operated 11.304 hours out of 16797 5 hours (67a) , <br /> for a total of 25, 756 out of 37845 5 hours (680) Since the <br /> September 2 , 1994 visit the REMOX unit has only operated <br /> sporadically, and is found in the off position when site visits <br /> occur The system is restarted and stabilized, but once <br /> unattended, " flame out" occurs within a couple of hours "Flame <br /> out" is the loss of the pilot , which automatically shuts the <br /> system down As of September 13 , 1994 an estimated 73898 pounds <br /> of gasoline range hydrocarbons have been destroyed, see Table 2 , <br /> Chart 7 and Appendix A - Air monitoring Report <br /> Since February 18 , 1993 the vapor recovery/destruction has been <br /> declining from an average above 200 pounds per day of gasoline <br /> range hydrocarbons to a present low of less than 10 pounds per <br /> riav of gasoline range hydrocarbons since April 26 , 1994 <br /> Presently the system is destroying a range from 6 to 1 pounds per <br /> day of gasoline range hydrocarbons <br /> PAGE 1 <br />