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Ultramar <br /> Ultrarnar,Inc Telecopy 209-585 5685 Credit <br /> PO Box 466 209-583 3330 Administrative <br /> 525 W Third Street 209 583 3302 Information Services <br /> Hanford,CA 93232 0466 209-583 3358 Accounting <br /> (209)582 0249 <br /> DATE REPORT SUBMITTED November 11, 1999 <br /> QUARTER ENDING September 30, 1999 <br /> SERVICE STATION NO 641 <br /> ADDRESS 1210 East Hammer Lane, Stockton, Cahfornia <br /> COUNTY San Joaquin <br /> ULTRAMAR CONTACT Joseph A Aldridge TEL NO 559-583-3231 <br /> BACKGROUND <br /> In June 1996, the underground storage tanks were removed and replaced with double-wall <br /> tank systems Soil samples collected from beneath the former tank locations contained <br /> petroleum hydrocarbons <br /> Five groundwater monitoring wells, one air-sparge well, and eight vapor extraction wells were <br /> installed in 1996 and 1997 The monitoring wells have been sampled quarterly since October <br /> 1997 <br /> A Work Plan for further groundwater assessment was submitted in April 1999 <br /> SUMMARY OF THIS UARTER'S ACTIVITIES <br /> Doulos Environmental conducted groundwater monitoring on August 31, 1999 <br /> Groundwater samples were collected from the five existing monitoring wells, one air-sparge <br /> well, and three vapor extraction wells <br /> RESULT OF QUARTERLY MONITORING <br /> Benzene and MTBE were detected in groundwater samples collected from the UST area and <br /> the off-site monitoring well west of the USTs <br /> PROPOSED ACTIVITY FOR NEXT QUARTER ESTIMATED COMPLETION DATE <br /> Perform quarterly groundwater monitoring October 1999 <br /> Conduct further soil and groundwater assessment October 1999 <br /> A Member of 1he Ultramar Group of Companies #1 Quality and Service <br /> Uiltrartt�r <br />