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455 West Grant Line <br /> Page 2 <br /> I <br /> The current trench running east west has monitoring wells, MW8 (screened from 6-16') <br /> MW9 (screened from 2-8') and MW10 (screened from 2.5-8') plumbed for use as vapor <br /> extraction wells; however, screened horizontal piping was not installed. Fluor-Daniel GTI <br /> indicated that installation and operation of a low flow bio-sparge system could result in the <br /> vertical migration of .petroleum hydrocarbon vapors and therefore, was not recommended <br /> for installation and/or operation at this time. <br /> Greater detail was provided in Fluor-Daniel GTI correspondence dated August 12, 1996 i <br /> regarding the proposed piping configuration. Despite, PHSIEHD's many references to soil <br /> contamination and difficulties assessing contaminant mass given scant soil data, samples <br /> were not collected when the tanks were removed, Fluor-Daniel GTI clearly stated that the <br /> installation of any future soil borings or wells would be dependent on soil and groundwater <br /> analytical data obtained following the installation of the two wells proposed. <br /> i� <br /> Please be aware that given current information, it is essentially impossible to evaluate i <br /> remedial alternatives. Hopefully, the proposed groundwater extraction system will control <br /> f. the migration of the groundwater,plume and sufficiently dewater areas of the site so that <br /> further information can be obtained to evaluate alternatives. <br /> } <br /> f <br /> To install the two proposed groundwater extraction wells, please submit a drilling permit <br /> application and $89 permit fee. j <br /> If you have any questions or comments, please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Lead Senior <br /> MM1455GL <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Al Ellis, Rishwain, Hakeem and Ellis <br /> cc: Jaff Auchterlonie, Fluor Daniel GTI <br /> 6 <br /> y <br />