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r <br /> Mr. Paul Supple <br /> Arco Station No. 6100 <br /> 25775 Patterson Pass Road <br /> Page 2 of <br /> Please prepare a work plan to continue investigating the down-dip lateral extent <br /> and the width of the plume of free product migrating from your site. Submit the <br /> work plan to this office no later than 03 October 2005. EHD believes the goals of <br /> the next phase of investigation would be to delineate the extent of the free <br /> product plume northeast of MW-15, northeast and southwest of MW-15 and <br /> further down-gradient of MW-15 if free product is encountered. An additional <br /> groundwater monitoring well will be needed in the down-gradient direction when <br /> the free product and/or dissolved plumes are better delineated. The results of the <br /> investigation should be submitted in the context of the site conceptual model to <br /> this office within 60 days of completion of field activities. <br /> Questions or comments may be directed to Nuel Henderson by telephone at <br /> (209) 468-3436, or by mail to the address on the letterhead. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PGMargare Lf agorio <br /> Unit IV - Site Mitigation Supervisor, Unit IV <br /> cc: James L. L. Barton, PG — CVRWQCB <br /> Jay R. Johnson, PG — Stratus <br /> The Robert and Cleo Vieira Family Trust <br />