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Stantec Work Plan for Vapor ProbeDestruction,Well Destruction,and Well Installation ARCO Service Station No. 2186 October 14,2008 extraction of soil vapors from these wells at nine to ten cubic ft per minute (cfm), with 50 to 100 inches of water column resulted in a radius of influence between 34. and 45 ft. The initial hydrocarbon mass extraction rates were calculated to be between 1.10 and 3.88 pounds (lbs) of GRO per day. In August 2001, Delta installed three groundwater monitoring wells(MW-5 through MW-7). MW-5 is located east of the site on American Street. MW-6 and MW-7 are located in Oak Park,across Alpine Avenue, to the northwest and northeast of the site. In April of 2004, one deep groundwater monitoring well (MW-8) was installed in the.dominant downgradient direction from the UST cavity (east-northeast) to assess the vertical extent of petroleum hydrocarbon-impacted groundwater beneath the site. One vapor extraction well(VW-4) was installed to complete the remedial well network at the site. One air sparge well (AW-1)was installed for use in conjunction with the vapor wells in the SVE pilot test. Groundwater monitoring and sampling have been conducted at the site since 1995: Groundwater flow is predominately toward the northeast and east. In January and February 2008;three soil vapor probes (VP-1 through VP-3) were installed and sampled in the presence of SJCEHD personnel. 2.0 PROPOSED SCOPE OF WORK The proposed scope of work for this work plan includes destroying soil vapor probes VP-1 through VP-3, destroying groundwater monitoring wells MW-1 and£MW-3, instailing`two shallow-zone_ groundwater monitoring wells (MW=1 R and MWr 3R), and installing one deep zone groun' vatenT monitoring well.(MW-1 D). Details for the activities associated with the completion of the scope of work are provided below. 2.1 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 on-site at all times during field work. The field staff and.contractors performing field activities will reView'tne'HASP'prior to beginning field operations, as described in this work plan, at the site. 2.2 Permitting and Preliminary Field Activities Prior to beginning field work, all necessary permits will be obtained. All boring locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 48 hours in advance of drilling, to allow the local underground utility companies to 2186 Work Plan for Vapor Probe Destruction, Well Destruction, and Well Installation.doc 2