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- -�' <br /> ft- 11' ' <br /> -�4 a ,+ + _ _i t4 �� � y ! � �t <br /> Mr. H. C. Winsor <br /> September 16. 1987 <br /> Page 9 <br /> The plume is insufficiently characterized <br /> -- <br /> station. The change in gradient between west of April and July the ARCO <br /> indicates <br /> the Plume may have migrated wr-t. SC recommends the installation of <br /> two additional monitoring w_ •s west <br /> determine whether this has ha of <br /> ppen�d, the ARCO station to <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 <br /> and sewer discharge requirements currently being established b the <br /> e Cit <br /> City. We also recommend that the and additional wells <br /> -' of service. Y continue to hold Well 12 out <br /> If You have any questions <br /> or <br /> Phillips ar Ms, Jeanne Wallb rg at (916)comments,444a-012 Contact Mr. Larry <br /> t <br /> 1 �. <br /> � f Very truly yours, <br /> BROWN AND CALDWELL <br /> p t Robert A. Witzgall <br /> Chief Engineer <br /> P � � �i.h ate.l�r� .r• � - <br /> Lawrence E. Phillifps <br /> `_d Registered Geologist <br /> 3710 <br /> RAW:LEP:mjd <br /> t v Enclosures (4) <br /> f <br /> cc/enc: 'Ms. Karen Schultheis ARCO Pet1 <br /> San Mateo Petroleum Products Company, <br /> j !411 Mr. Hank Sheetz, ARCO Petroleum Products Company, <br /> YI <br /> Pleasanton P <br /> Mr. Steve Boll, California Regional Water <br /> Board, Sacramento g Quality Control <br /> X y 4s. Laurie <br /> - otulla, San Joaquin Local Health District, <br /> -- -- - Mr._FranFotkas y of <br /> Cat Lodi, nodi. - --- - --- <br /> -- <br /> 3 <br /> ..� BROWN AND CALDWELL <br /> { V <br /> r - 7735SiREEf SACRAMENI0,CA 95B14.�91B1944p173 <br />