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Mr.James L.L. Barton Former Countryside Market October 19,2011 Stockton, California Page 3 of 6 • Underground Services Alert will be notified at least 48 houm prior to drilling to clear underground utilities in the proposed drilling location; • SGI will retain a private utility locator to clear the proposed drilling locations of underground utilities and other possible subsurface obstruction ; and, • The SJCDEH, and other necessary parties will be notified of proposed field activities at least three days prior to initiating field work. SENSITIVE RECEPTOR SURVEY A sensitive receptor survey will be conducted within a 500-foot radius of the Site. The survey will include a review of historical files located at the Department of Wal er Resources (DWR) and CRWQCB. The survey will include a detailed review of environme tal databases (procured from Environmental Data Resources or EDR) and a door to door survey (within the neighborhood directly adjacent and immediately down-gradient of the Site) to identify any private wells that may be utilized for domestic purposes. Once all surrounding domestic wells have been identified and acces agreements have been procured from property owners, SGI will collect groundwater water samples from each well. Domestics wells well be purged for approximately one hour or until three well casing volumes have been removed. During purging, water parameters including pH, lemperature, conductivity, dissolved oxygen and turbidity will be monitored to note stabilizatioli of each parameter and ensure that groundwater representative of the aquifer is entering the well. Samples will be collected through the faucet and slowly decanted into a laboratory r rovided containers to be submitted to a State-certified laboratory for analysis. The samples will be analyzed for TPHg, BTEX compounds, and 7 fuel oxygentae compounds (MtBE, TBA, EDB, DIPE, EtBE, TAME, and 1,2-DCA) using United States Environmental Protection Agency (L SEPA) Method 8260B. DRILLING AND SOIL SAMPLING SGI will supervise the drilling, soil sampling, and installation of five monitoring wells at the proposed locations shown on Figure 2. Drilling will be completed using a CME-85 hollow stem auger drill rig (or equivalent) equipped with 8-inch diameter augers and operated by a California-licensed drilling contractor. Prior to drilling, the locations will be cleared by hand- augering and post-holing to five feet bgs. The augers will be steam-cl aned between each well location to prevent cross-contamination from previous sampling eventst Five borings will be completed to approximately 100 feet bgs. Soil 5amples will be collected from the borehole using a split-spoon sampler loaded with clean, -inch brass sleeves for sample retention. The end of each sample sleeve will be covered with TeflonTM sheeting, capped with plastic end caps, labeled with a unique sample number, date of collection and sample location and depth, and placed in an ice-filled cooler. Soil sc mpling will be conducted