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4 Ultramar <br /> Ultramar,Inc. Telecopy: 209-585&5685 Credit <br /> P.O.Box 466 209-583-3330 Administrative <br /> r 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br />` (209)562-0241 <br /> 4 <br /> DATE REPORT SUBMITTED: May 5, 1999 <br /> QUARTER ENDING: March 31, 1999 <br /> f SERVICE STATION NO.: 641 <br /> ADDRESS: 1210 East Hammer Lane, Stockton, California <br /> COUNTY: San Joaquin <br /> ULTRAMAR CONTACT: Joseph A. Aldridge TEL. NO: 559-583-3231 <br /> I BACKGROUND: <br /> i - <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 containd - <br /> k` 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 /> l <br /> SUMMARY'OF THIS QUARTEWS ACTIVITIES <br /> IG <br /> Groundwater.monitoring was conducted by Doulos Environmental on March 25, 1999. <br /> Groundwater samples were collected from-the five existing monitoring wells, one air-sparge <br /> well; and three vapor extraction wells. A Work Plan for further groundwater assessment was <br /> submitted in April. <br /> RESULT OF QUARTERLY MONITORING: <br /> I Benzene and MTBE were detected in groundwater samples collected from the UST area and <br /> I <br /> the off-site monitoring well west of the USTS'. <br /> PROPOSED ACTIVITY FOR NEXT QUARTER: ESTIMATED COMPLETION-DATE <br /> f Perform quarterly groundwater monitoring May 1999 <br /> 4 Further Groundwater Assessment June 1999 <br /> IEi <br /> S " <br /> BEACON <br />' } <br /> #1 Quality and Service <br /> A-Member of the Ultramar Group of Companies <br /> lJmrars�ar- <br /> i <br /> - s <br />