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Ms Margaret Lagorio Project 20805-142 008 July 21, 1998 Page 2 Well VW-6 was decommissioned by drilling out the well seal, casing and filter pack, and bottom seal to a depth of 30 feet bgs The drill-out depth was approximately 4 feet below the bottom of the completed well This overdrill was conducted at the request of the PHS/EHD, based on soil analytical results for the borehole collected at the time of well installation in 1992 The borehole was sealed with cement grout placed through a tremie pipe to within 5 feet of ground surface Cuttings were used to backfill to within 112 foot of ground surface An asphalt cap was placed flush with existing pavement Wells VW-12 and VW-13 were decommissioned filling each well with cement grout placed through tremie pipe to within 5 feet of ground surface A pressure fitting was installed at each wellhead and a pressure of approximately 30 pounds per square inch was applied for approximately 3 minutes to force the grout through the filter pack The upper 5 feet of each well casing and seal were drilled out using hollow-stem auger drilling equipment Cuttings were used to backfill this interval, and a cement cap was placed over the former well locations flush with ground surface A copy of the Department of Water Resources Well Completion Report No 703745, certified by the drilling contractor, is attached i� If you have any questions or comments regarding this letter report, please call us at (530) 676-6884 Sincerely, Pinnacle Mark Capps, R G J R nson, R G Project Geologist en or Project Supervisor Attachments Figure 1 Site Location Map Figure 2 Site Plan DWR Form 703745 cc Paul Supple, ARCO Products Company Pat Anderson, Regional Water Quality Control Board, Central Valley Region (40) SACIN 1,PJO10805108051420 8AS-981pzusmer 1 Pam",& Rev 0,7/21/98 + ,r i ��