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1 <br /> 2.0 SCOPE OF WORK <br /> 1 <br /> The objectives of this investigation were to further assess the lateral extent of impacted <br />' groundwater and to expand the on-site groundwater monitoring network, so that the groundwater <br /> flow direction and gradient could be calculated and monitored To achieve these objectives, one <br />' additional on-site groundwater table monitoring well was permitted, installed, surveyed, monitored <br /> and sampled, and the nearby municipal irrigation well was sampled <br />' 2.1 Project Planning <br /> Prior to initiating fieldwork, a site-specific health and safety plan addendum was prepared <br /> according to 29 CFR 1910 120 The health and safety plan included safety procedures, chemical <br /> hazard information, site safety officers, and preferred medical emergency locations <br /> On November 28, 2001, PHSIEHD issued permit SR#0028186 to complete the on-site monitoring <br />' well A copy of the approved permit is included in Appendix A At least two working days prior to <br /> drilling, PHSIEHD and Underground Service Alert (USA) were notified so that regulatory and utility <br /> clearance inspections could be scheduled Underground utilities were marked by USA member <br /> 1� utilities under USA Ticket#363461 <br />' 22 Groundwater Monitoring Well Installation <br /> On November 29, 2001, under the supervision of Ramage Environmental, Mitchell Drilling (C-57 <br />' License#672617) installed one on-site groundwater table monitoring well (MW-3) to expand the <br /> groundwater monitoring network to the north, between the fueling system and the municipal <br />' irrigation well (Figure 2) <br /> 2 2 1 Monitoring Well Construction, Development_and Survey <br /> Mitchell Drilling installed the well in an 8-inch diameter sod boring, drilled to a depth of 55 feet bgs, <br />' using a truck-mounted CME 75 drill rig and hollow stem augers The well consisted of 20 feet of <br /> two-inch diameter, Schedule 40, flush-threaded and machine-slotted (0 020-inch) polyvinyl <br /> chloride (PVC) well screen, spanning from approximately 35 to 55 feet bgs Blank PVC casing <br />' was threaded into the top of the well screen and extended to the surface A filter pack of#3 <br /> graded and washed silica sand was placed through the hollow stem augers as they were slowly <br />' retrieved and until the sand pack reached approximately two feet above the top of the screened <br /> interval (i e , 33 feet bgs) <br />' 7 <br />