ARCHIVED REPORTS_XR0006723 CASE 1

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2.0 SCOPE OF WORK ' The project objectives were to further define the lateral extent of impacted groundwater, and to expand the groundwater monitoring capability at the site To achieve these objectives, two additional groundwater table monitoring wells (MW-5 and MW-6) were permitted, installed, and surveyed Groundwater in the new and existing wells was monitored, sampled and analyzed 1 21 Project Planning and Permitting Prior to initiating fieldwork, a site-specific health and safety plan addendum was prepared according to 29 CFR 1910 120 The health and safety plan included safety procedures, chemical hazard information, site safety officers, and a medical emergency location To install the monitoring wells, permits (SR#31534 and 31594) were obtained from EHD Since ' one of the monitoring wells was installed along Raylow Avenue, an encroachment permit (#4452) was obtained from the city of Manteca At least two working days prior to dulling, Ramage Environmental notified EHD so that any inspections could be scheduled Underground Service Alert was also notified to complete a utility clearance inspection (USA Ticket#433172 and 433183) 22 Groundwater Monitoring Well Installations To further rt er define the lateral extent of gasoline compounds at the groundwater table, and to expand the groundwater table monitoring capability at the site, two additional groundwater monitoring wells (MW-5 and MW-6) were installed northeast (downgradient) of the former UST system (Figure 3) 1 2 2 1 Monitoring Well Construction, Development and Elevation Survey On October 23, 2002, under the supervision of Ramage Environmental, Mitchell Drilling (C-57 License#672617) installed the two monitoring wells with a CME-75 drilling rig and 8-inch diameter hollow-stem augers Both wells were constructed to total depths of approximately 30 feet, and consisted of 15 feet of two-inch diameter, Schedule 40, flush-threaded and machine-slotted (0 020- inch) polyvinyl chloride (PVC) well screens, spanning from approximately 15 to 30 feet below ground surface (bgs) Blank PVC casings threaded into the tops of the well screens and extended to the surface 8 i 1 1