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URS <br /> Ms.Kathy Amaru Page 2 of 3 <br /> Regional Water Quality Control Board-Central Valley Region <br /> May 6,2011 <br /> PROJECT HEALTH AND SAFETY <br /> URS prepared a site-specific HASP and made it available on site during field activities.All field <br /> personnel reviewed the HASP before the start of field activities. <br /> UTILITY CLEARANCE <br /> Well locations were clearly marked and Underground Service Alert was notified at least 48 hours before <br /> field activities begin. <br /> ' MONITORING WELL INSTALLATIONS <br /> ' URS installed two groundwater monitoring wells (MW-24-BP and MW-25-BP)on March 30,2011,in <br /> preparation for the proposed EOS Pilot Test. These wells will serve as transition wells during the pilot <br /> test. Figure 2 shows the well locations with respect to the proposed test area. <br /> ' The wells were installed using a direct-push drilling rig and constructed of pre-packed 0.75-inch <br /> diameter polyvinyl chloride(PVC).The well assembly consisted of a standard, slotted PVC well screen <br /> ' pipe surrounded by a stainless steel mesh that was lowered into the probe rod string with threaded PVC <br /> riser pipe.The pre-packed well consisted of schedule 40 PVC with 0.010-inch slots and a 20/40 mesh <br /> sand factory packed in a stainless steel screen.Both wells were screened from approximately 6 to 21 feet <br /> ' bgs. A bentonite barrier was pre-packed directly above the sand pack from to prevent grout from <br /> entering the screens.The wells were sealed with a bentonite slurry from surface to 3 feet below ground <br /> surface and completed at the surface with 3-foot monuments and yellow-painted traffic bollards. <br /> Attachment B contains the well construction logs and field notes. <br /> WELL DEVELOPMENT <br /> ' The wells were developed using a 0.5-inch diameter bailer by continuously surging over the entire <br /> screened interval. Well development was completed by purging a maximum of 10 casing volumes. <br /> Attachment B contains the well development logs. <br /> WASTE DISPOSAL <br /> ' Soil cuttings and wastewater generated during the drilling and development activities were stored in <br /> 55-gallon DOT-approved steel drums. One soil and one groundwater sample was collected for analysis <br /> of volatile organic compounds,total petroleum hydrocarbons as gasoline by United States <br /> Environmental Protection Agency Method 8260,Title 22 Metals, and hexavalent chromium by SW7199. <br /> Belshire Environmental Services, Inc.transported and disposed of the drums to an appropriate landfill on <br /> May 2, 2011. Copies of the laboratory report and waste manifests are included as Attachment C and D, <br /> respectively. <br /> ' G:\STATE-COUNTY-CITY\STATE\Calif-DGS\Calif-DGS-RESD\UST PROJECT FII-ES\DVI\Eum Pit\07-Field&Analytical Data\2011 <br /> EOS Injection&Well Installation\MW-24 and MW-25 report\DVI MW-24—MW-25 Well Installation Rpt.doc <br />