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R603 UPDATE-31 8/15/94 INTRODUCTION This update, STATUS UPDATE 31, presents data from June 22, through August 8 , 1994 The vapor recovery system has not operated since 19 30 hours on June 24 , 1994 Up until that time the unit was operating at 1000-o since the system repairs were completed February 1, 1994 Due to a malfuncition of the high temperature controller the system automatically shut down at approximately 7 30 PM the evening of June 24, 1994 A Burners & Control! service technichian removed the high temperature controller soon afterwards and it has not been re-installed as of 8 00 PM August 8 , 1994 The permit to dump treated ground water to the sewer has been renewed Presently we are batch dumping the treated water from the "ConVault" whenever it is full 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 continually evaluating the need for a ground water pump and treat system 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 VAPOR RECOVERY OPERATIONS AND RESULTS The original REMOX unit operated for a total of 14452 hours out of a total of 21048 hours (69°s) As of June 24 , 1994 the new replacement unit operated 11177 hours out of 15122 hours (746) , for a total of 25, 629 ouz- of 36170 !lours (7111.0 AS cif uuixe 24 , 1994 an estimated 73860 pounds of gasoline range hydrocarbons have been destroyed, see Appendix - Air Monitoring Report Since February 18 , 1993 the vapor recovery/destruction has been Heclin3ng from an average above 200 pounds per day of gasoline range hydrocarbons to a present low of 9 9 pounds per day of gasoline range hydrocarbons on April 26 , 1994 Presently the system is destroying a range from 14 to 7 pounds per day of gasoline range hydrocarbons SUMMARY There has been no evidence of floating product or product sheen on the ground water in MW1 since April 14 , 1992 and MW3 and MW10 since November 11 , 1992 The last evidence of product , as a PAGE 1