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1 5 lip benzene, toluene, ethylbenzene, and xylenes (BTEX) concentrations of 6,$00 micrograms per ' liter (µglL), 17,000 µg/L, non-detectable, and 4,100 µg/L, respectively Groundwater samples collected in September 1987 from Monitoring Wells MW-2 and MW-3 contained non-detectable concentrations of TPH and BTEX compounds In January 1988, Anderson Consulting Group (ACG) installed Monitoring Wells ' MW-4 and MW-5 to further assess the extent of groundwater impact ACG subsequently �l Y installed Monitoring Wells MW-6 and MW-7 in February 1990, and Monitoring Well MW-8 in September 1990 These five monitoring wells are screened from about 23 to 60 feet BGS ' In the December 19, 1991, Problem Assessment Report, ACG indicated that the groundwater flow direction at the facility was to the east-northeast ACG estimated that ' groundwater beneath an area of about 22,000 square feet, centered around Monitoring Well MW-1, was impacted by gasoline ACG has been performing routine groundwater ' monitoring at the facility since 1990 Reports and documents describing previous UST-related work at the facility include the following Environmental Science and Engineering, Inc 1987 Contamination Assessment Report For Underground Gasoline Storage Tanks - Phase 11 Report December ' Earth Grains Bakery 1989 Closure Report December 21 Anderson Consulting Group 1990 to present Quarterly groundwater monitoring ' reports Anderson Consulting Group 1991 Problem Assessment Report December 19 ' Anderson Consulting Group 1992 Supplemental Information To The Problem Assessment Report July 7 ' 1.3 Scope of Work I To re-assess subsurface conditions, and replace dry groundwater monitoring wells, Burlington submitted a Proposed Workplan Addendum For Groundwater Monitoring Well Installations, dated January 18, 1994, to the San Joaquin County Public Health Services, I 04/94/121382/125997/STOCKREP REP/1 i