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1.0 INTRODUCTION On behalf of Phillips 66 Company (P66) and Atlantic Richfield Company (ARC), a BP Affiliated Company, Cardno ATC (ATC) is submitting this Monitoring Well Destruction Report (Report) to San Joaquin County Environmental Health Department (SJCEHD) for 76 (Former BP) Service Station No. 11194 (site). The Report was prepared in response to the No Further Action Required Concurrence letter, dated September 15, 2011, from the California Regional Water Quality Control Board—Central Valley Region (Appendix A). 2.0 SITE LOCATION The site is currently a closed 76-brand gasoline service station located at the northwest comer of the intersection of North Tracy Boulevard and Grant Line Road in Tracy, California (Figures 1 and 2). British Petroleum (BP) purchased the site from Mobil Oil in 1989 and operated at the site until ownership was transferred to Tosco Corporation (Tosco, now Phillips 66) in 1994. The current station configuration consists of a vacant station building with two auto service bays, two dispenser islands, and four double-walled fiberglass underground storage tanks (USTs); one 12,000-gallon capacity, two 10,000-gallon capacity, and one 1,000-gallon capacity. 3.0 SCOPE OF WORK The scope of work consisted of properly destroying eight onsite groundwater monitoring wells and seven offsite groundwater monitoring wells in compliance with State and County guidelines. Well destruction activities were conducted on September 6 and 7, 2012, September 10 and 11, 2012, and January 14 and 16, 2013. Of the 15 monitoring wells that were destroyed, 11 monitoring wells were destroyed by pressure grouting and the remaining four monitoring wells were over-drilled to total depth utilizing hollow-stem augers followed by grouting. 3.1 Site Health and Safety Plan As required by the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by California Occupational Safety and Health Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), ATC prepared a Site-Specific Health and Safety Plan (HASP) prior to the commencement of fieldwork. The Site- Specific HASP was reviewed by field staff and contractors before beginning field operations at the site. 3.2 Permitting ATC obtained a well destruction permit from the San Joaquin County EHD prior to beginning work. Well destruction activities were observed and approved by Mr. Johnny Yoakum of the EHD. Copies of permits are included in Appendix B. r 1 76(Former 8P)Service Station No.11194 ATC Project Number 75.75119.1750 Tracy,California March 5,2013