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CV <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> ATC <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> A s s o c i A T E S I N c . Fax 209.579.2225 <br /> �� CcCI��ILD <br /> April 29, 2004 APR 3 0 2004 <br /> Ms. Margaret Lagorio ENVIRO'v(J 1ENI HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 E. Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Addendum to the Workplan for Additional Subsurface Investigation at Three <br /> Palms Grocery located at 6732 East Highway 88, Stockton, California <br /> Dear Ms. Lagorio: <br /> In response to the telephone conversation on April 27, 2004, between Ms. Margaret Lagorio of <br /> the San Joaquin County Environmental Health Department and ATC Associates Inc. (ATC), <br /> ATC has prepared this addendum to the Workplan for Additional Subsurface Investigation at <br /> Three Palms Grocery located at 6732 East Highway 88, Stockton, California dated January 8, <br /> 2004. Per our conversation, the proposed Geoprobe® soil boring located southwest of <br /> monitoring well MW 1 and the former underground storage tanks will be drilled using direct push <br /> Geoprobeg technology to an approximate depth of 50 feet bgs. The soil boring will then be <br /> drilled until the first encountered groundwater, estimated to be about 90 feet bgs, using 2-1/2 <br /> inch augers and sampling at selected intervals as determined by the underlying lithology and at <br /> depths of known contamination to further evaluate the lateral extent of impacted soil and <br /> groundwater beneath the site. The proposed boring location is shown on the attached Figure 2. <br /> If you have any questions or require additional information regarding this workplan addendum, <br /> please contact us at(209) 579-2221. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> Nathan Christman <br /> Staff Geologist <br /> Jeanne Hornsey, P.E. <br /> Registered Engineer No. C47410 <br /> Attachments <br /> cc: Ms. Leanne Scannavino <br /> Mr. Jim Barton, CA Regional Water Quality Control Board, Central Valley Region <br /> wA148a5 I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />