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snow, 4.0 SCOPE OF WORK `, 4.1 Site Health and Safety Plan As required by the Occupational Safety and Health Administration (OSHA) Standard low "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), Cardno 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. .r 4.2 Permitting Cardno ATC obtained well destruction permits from the SJCEHD prior to beginning work. Well .. destruction activities that were changed from the submitted workplan due to field conditions were approved by SJCEHD. Copies of well destruction permits are included as Attachment 1. `r 4.3 Subsurface Utility Clearance Prior to field activities, Cardno ATC marked all proposed drilling locations in accordance with the Underground Service Alert (USA) guidelines, and notified USA North of the subsurface activities so existing underground utilities in the area of the work could be located and avoided. Cardno ATC also contracted a private utility locator to confirm the locations of the underground utilities in the vicinity of the work and identified no other subsurface conflicts with the work locations. Ono 4.4 Well Destruction Activities The scope of work consisted of destroying the existing site-related monitoring wells. The well low destruction method for each well is summarized in Table 1. Well Destruction Activities r The former well network consisted of twelve groundwater monitoring wells identified as MW1 and MW3 through MW13, ten sparge wells identified as SP-A through SP-H, SPJ and SP-K, and two vapor wells identified as VW-1 and VW-2. The former locations of the wells are shown on Figure 2. The groundwater monitoring wells were installed to depths ranging from approximately 28 feet bgs to 45 feet bgs with well MW11 installed to a depth of 79 feet bgs. woo The destruction of 24 wells occurred from February 18 to 27, 2014, and was performed by Gregg Drilling and Testing, California License C57 485165. The well boxes associated with the monitoring wells, sparge wells and vapor wells were removed prior to destruction. 001 Originally all wells were approved to be destroyed by overdrilling. Due to the presence of underground obstructions near wells MW-1, MW-3, MW-5, MW-7, MW-8, SP-G, and SP-K No overdrilling the casing and sandpack could not be done safely. Ms. Adrienne Ellsaesser from the SJCEHD was contacted to request a variance from the required destruction method. Ms. 5 bw 76 Service Station No.11192 Cardno ATC Project Number 52.75118.2390 Stockton,California May 1,2014 6.6