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2 0 SCOPE OF WORK <br /> The protect objectives were to further investigate the extent of impacted soil and groundwater, <br /> establish a groundwater monitoring capability at the site, and survey possible sensitive receptors <br /> in the site vicinity To achieve these objectives, four on-site groundwater monitoring wells were <br /> installed, and possible sensitive receptors within 2,000 feet of the site were surveyed <br /> 21 Planning and Permitting <br /> Prior to initiating fieldwork, a site-specific health and safety plan addendum was prepared <br /> according to 29 CFR 1910 120 The addendum included safety procedures for work to be <br /> performed, chemical hazard information, and a medical emergency location <br /> To perform the drilling scope of work, monitoring well permits (SR #0030311 and 0030312) were <br /> obtained from PHS/EHD Since two of the wells were installed within the city of Stockton <br /> sidewalk, an encroachment permit (#66825) and a revocable permit (#RP 02-16W) were obtained <br /> from the city Copies of the approved permits are included in Appendix A <br /> At least two working days prior to field work, Ramage Environmental notified PHS/EHD and the <br /> city of Stockton so that any inspections could be scheduled Underground Service Alert was also <br /> notified to complete utility clearance inspections (USA Ticket#299396) <br /> 22 Groundwater Monitoring Well Installations <br /> Jul 11 and 12 2002 under the supervision of Ramage Environmental Mitchell Drilling C-57 <br /> On y P g g <br /> License#672617) installed four groundwater monitoring wells (MW-1, MW-2, MW-3 and MW-4) <br /> with a CME-75 drilling rig and 8-inch diameter hollow-stem augers Monitoring wells MW-1 and <br /> MW-2 were installed in the city sidewalk, near the south ends of the former USTs Monitoring well <br /> ' MW-3 was located inside the on-site building near the former dispenser island Since the regional <br /> groundwater flow direction was expected to be toward the north-northeast, Monitoring well MW-4 <br /> was positioned inside the on-site building approximately 60 feet north of the former dispenser <br /> island The monitoring well locations are shown on Figure 3 <br /> ' To install the monitoring wells in the concrete surface pavement, Penhall Company saw-cut two <br /> sidewalk squares for MW-1 and MW-2, and drilled two, 12-inch diameter cores for MW-3 and <br /> MW-4 Given the restricted overhead clearance inside the building, Mitchell Drilling advanced the <br /> soil borings for MW-3 and MW-4 with the rig tower down <br /> 7 <br />