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1 Stantec Consulting Services Inc. 3017 Kilgore Road,Suite 100 Rancho Cordova,California 95670 Tel:(916)861-0400 Fax:(916)861-0430 Stantec December 5, 2012 Ms. Lisa Medina San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202 Re: Revised Well Destruction Work Plan Chevron and ARCO Commingled Plume No. CP0034 (Chevron Facility No. 94275 and ARCO Service Station No. 2133) 2905 and 2908 West Benjamin Holt Drive Stockton, California 95207 Dear Ms. Medina: On behalf of Chevron Environmental Management Company (Chevron) and Atlantic Richfield Company, a BP Affiliated Company (ARC), Stantec Consulting Services Inc. (Stantec) is submitting this revised well destruction work plan for the Chevron Facility No. 94275 and ARCO Service Station No. 2133 located at the above referenced address (the "Site; Figure 1). The well destruction work plan was requested from the San Joaquin County Environmental Health Department (SJCEHD) in a letter dated November 6, 2012 (Attachment A) as part of site closure activities. The Site has been part of an environmental investigation case under the direction of the SJCEHD. This revised work plan presents a detailed scope of work proposed for monitoring and remediation well destruction. Well construction details and the proposed well destruction method for each well are included in Table 1. The Well Destruction Work Plan dated April 10, 2012, was submitted as an attachment in the No Further Action Request Report dated April 10, 2012. The April 10 work plan incorrectly indicated that locations AS-8 through AS-11 were wells that needed be destroyed. Locations AS-8 through AS-11 were drilled as soil borings and as such properly abandoned at the time of drilling. This work plan has been revised to remove locations AS-8 through AS-11 from the well destruction scope of work. No other revisions have been made to the April 10 work plan. Site Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120) and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), the contractor will prepare a site specific Health and Safety Plan (HASP). At a minimum, the HASP will define the proposed subsurface investigation activities, describe physical and chemical hazards that may be associated with the work, provide a map to the nearest emergency medical facility, and include material safety data sheets for any hazardous chemicals that will be used or produced during the work. A copy of the HASP will be available onsite at all times during field work. The field staff and contractors performing field activities will review the HASP prior to beginning field operations, as described in this work plan, at the site. Revised Well Destruction Work Plan 2012.docx 1