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Mr. Gordon Boggs • 40 <br /> December 11, 1996 <br /> Page 3 <br /> after installation of new ground water monitoring wells is to provide additional assurance that <br /> any water introduced during the installation of a new well is removed; and, further improve <br /> the hydraulic communication between the filter pack and the aquifer by removing entrained <br /> fine-grained material remaining from well development procedures. Both no-purge and post- <br /> purge samples will be obtained during the final sampling event prior to closure to address <br /> "post-purge detection only" cases. "Post-purge detection only," defined in the SECOR <br /> publication as "a well in which all analytes are ND [non-detect] in the no-purge sample with at <br /> least one analyte detected in the post-purge [sample]," was encountered in 13.4% of the wells <br /> sampled during the WSPA study. <br /> ARCO and the State UST Reimbursement Fund will immediately realize significant cost <br /> savings with the implementation of this program. <br /> Please do not hesitate to call me at (714) X43-3147 with any questions. <br /> Sincerely, <br /> ARCO PRODUCTS COMPANY <br /> 7� Z00� <br /> Kateri Luka <br /> Senior Environmental Engineer <br /> KL:RH.rh <br /> cc: J. Giannopolis - State Water Resources Control Board, Sacramento <br /> D. Deaner - State Water Resources Control Board, Sacramento <br /> A. Patton - State Water Resources Control Board, Sacramento <br /> J. Munch - State Water Resources Control Board, Sacramento <br /> T. Peacock- Alameda County Environmental Health, Alameda <br /> B. Beniki - Contra Costa Occupational Health, Martinez <br /> J. Favila - Colusa County Environmental health, Colusa <br /> J. Rusert - El Dorado County Environmental Health, Placerville <br /> G. Carozza - Fresno County Environmental Health Department, Fresno <br /> W. Peeler- Merced County Environmental Health, Merced <br /> J. Pahl - Napa County Environmental Health, Napa <br /> T. Gidel - Nevada County Environmental Health Department, Nevada City <br /> R. Swensen - Placer County Environmental Health,Auburn <br /> S. Anderson - Roseville Fire Department, Roseville <br /> B. Knight - Sacramento County Environmental Health, Sacramento <br /> D. Heran - San Joaquin County Environmental Health, Stockton <br /> c1hmd\ena\mgion5.dm <br />