SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

GEOMATRIX Mr.Mark Buckon Chevron Research and Technology Company . 30 November 1994 Page 3 ation, Inc., of Stockton, California. Mr. Mike infuma of EHD was on site to.observe the well abandonment. Spectrum used a CME-45 drill rig equipped with 8-inch outside-diameter hollow-stem augers for the well abandonment. The well monuments and covers for both wells were removed. For monitor- ing well MW-2, the borehole was drilled to approximately.21 feet below ground surface (bgs) and the entire well casing was removed. When the augers were removed from the MW-2 borehole,soil material filled the borehole from about 21 feet bgs to 17 feet bgs. With the approval of Mr. Infurna, the MW-2 borehole.was filled with cement grout via a tremie tube from about 17.feet bgs to about 2 feet bgs. The remaining 2-feet of the MW-2 borehole was filled with native soil from adjacent areas. The top five-feet of monitoring well MW-4 was drilled using a solid. core bit. Hollow-stem augers were subsequently used to drill well MW-4to its total depth of about 20 feet. bgs. With-Mr Infurna's approval, the MW-4 borehole was filled with cement grout via the augers from 20 feet bgs to 3 feet bgs with most of the wellcasing in-place. The upper 3 feet of the bore- hole was filled with native soil from adjacent areas. Soil cuttings,grout,and well casing pieces from the former two wells were placed in labeled 55-gallon drums and stored in the fenced area on-site. Geomatrix is pleased to be of continuing service to Chevron Pipe Line Company. Please call if you have any questions. Sincerely yours, GEOMATRDC CONSULTANTS, INC. .� Veen hee Foon P. E. ��IiamVPi es . G.g, P , Project Engineer Principal Geologist Attachments cc: _Mr. Don Culbertson, Chevron Pipe Line Company --.Mr. Mike Infurna, San Joaquin County Environmental Health Department< Mr.-David Jenkins; RWQCB Mr. Paul Verma, City of Tracy Public Works Department DOCuflleft CAWMACHEVRON12483.18 _ -