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"%TC <br /> 1117 Lone Palm Ave., Suite B <br /> Modesto, California 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> A S S 0 C I A T E S I N C Fax 209.5792225 <br /> F- <br /> F May 8, 2003 <br /> 54.62583.0001 <br /> i Ms. Mary Serra <br /> Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> FSacramento, CA 95527 <br /> Subject: Summary Report of Additional Subsurface Investigation, Deep Well Installation, <br /> F Diamond Walnut Growers, 1050 South Diamond Street, Stockton, California <br /> Dear Ms. Serra: <br /> ATC Associates Inc. has completed a Subsurface InvestYgation of the above referenced site. The <br /> investigation was performed to evaluate the horizontal extent of impacted groundwater at the site. Activities included: installing one additional monitoring well in the deeper water-bearing <br /> zone and collecting a groundwater sample from the deep well; surveying the wellhead; and video <br /> logging the existing facility well. Groundwater analytical results indicated that a very low <br /> concentration of hexavalent chromium was detected in the new monitoring well which is <br /> screened in the deeper water-bearing zone. The attached report summarizes our activities and <br /> findings in detail and recommendations for the installation of a deep well at the site. Based on <br /> the findings, ATC recommends quarterly sampling of the new well and no installation of <br /> additional deep wells at this time. Results of the video logging indicate that the facility well <br /> appears to be screened in more than one water-bearing zone and is a potential conduit for <br /> migration of groundwater between aquifers. ATC recommends proper destruction of the facility <br /> M well. <br /> F If you should have any questions or comments regarding this report or our recommendations„ please <br /> feel free to call us at your convenience at(209) 579-2221. <br /> Respectfully submitted, j <br /> ATC Associates Inc. <br /> John Sellman <br /> Staff Geologist <br /> Jeanne Hornsey, P.E. <br /> CA Registered Civil Engineer No. 47410 } <br /> cc: Mr. Mike Lescisin, Diamond Walnut Growers <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />