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e _'I <br /> v <br /> Mr- H. C. Winsor <br /> September 16. 1987 <br /> Page 9 <br /> 1 <br /> The plume is insufficiently characterized west of the ARCO <br /> station, The change in gradient between April and July indicates <br /> the plume may have migrated west. BC recommends the installation of <br /> two additional monitoring wells west of the ARCO station to <br /> determine whether this has happened. <br /> BC is currently designing a remedial system for the station. The <br /> remedial system will include soil venting in the vicinity of the <br /> leak site and a groundwater recovery system with air stripping and <br /> Possibly carbon filtration. Finalization of the remedial system <br /> design will incorporate data from the two proposed additional wells <br /> a and sewer discharge requirements currently being established by the <br /> City, We also recommend that the City continue to hold Well 12 out <br /> of service. <br /> ff <br /> If you have any questions or comments, please contact <br /> Phillips or Ms. Jeanne Wallberg at (916) 444-0123. Mr. Larry <br /> Very truly Yours, <br /> BROWN AND CALDWELL <br /> Robert A. Witzgal <br /> Chief Engineer <br /> " Lawrence E. Phillips <br /> . ) Registered Geologist <br /> 3710 <br /> RAW:LEP:mjd <br /> Enclosures: Ms. Karen{4) ' <br /> cc/encSchultheis, i <br /> m els/ ARCO Petroleum Products Company, i <br /> a# San !Mateo <br /> Mr. Hank Sheetz, ARCO Petroleum Products Company, <br /> H4 Pleasanton <br /> Mr. Steve Boll, California Regional Water <br /> `& I' Board, Sacramento Quality Control <br /> - 1-- - - ---- -Ms:Laurie Cotulla�-San Joaquin Local Health District, <br /> 3z� n Stockton <br /> i` Mr. Fran Forkas, :City of .Lodi Lodi <br /> aa{ . <br /> 3 <br /> y-t'w'a+aa _."""'n.-✓,•w++ w.....--..'cur- ,....... ` - - - <br />