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,e,% California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston H.Hickox Robert Schneider,Chair 0 <br /> Secretaryfor Gray Davis <br /> Environmental Sacramento Main Office Governor <br /> Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 M1DCMV <br /> 26 September 2003 <br /> Mr. Ed Stetsen SEP 2 '9' 280J003 <br /> Silgan Containers Corporation ENVIRORMENTH �I�ETH <br /> 1815 Navy Drive PERMIT/SERVi <br /> Stockton, CA 95206 <br /> REVIEW OF GROUNDWATER SAMPLING&SITE CLOSURE REPORT, <br /> SILGAN CONTAINER UNDERGROUND STORAGE TANK, 1815 NAVY DRIVE, STOCKTON, <br /> SAN JOAQUIN COUNTY(LUSTIS#390056) <br /> I reviewed the 30 July 2003 Groundwater Sampling&Site Closure Report(Report),prepared by Caporale <br /> Consultants, Inc. on behalf of Silgan Containers Corporation. The Report does not include the following <br /> required items for a Closure Request: <br /> • Estimates of remaining mass of contaminants in soil and groundwater, including <br /> 1,2-dichlorethene (1,2-DCE). <br /> • Modeling to provide an estimate of the time for all remaining contaminants to reach Water Quality <br /> Objectives (WQO), and the distance that the groundwater plume will travel. For example, 1,2-DCE <br /> varies seasonably from 7 to 13 gg/L, and has a WQO of 6 gg/L. Modeling fate and transport of the <br /> higher 1,2-DCE concentration will provide the estimate of the time required to reach a steady state <br /> concentration below WQO, and show how far the plume will travel during that time,providing data for <br /> evaluating whether sensitive receptors will be impacted by any of the contaminants left in place. The <br /> modeling needs to be done by an appropriately licensed professional. <br /> • An updated Sensitive Receptor Survey of all nearby water supply wells(private and public),which was <br /> requested in Regional Board letters dated 29 November 2001 and 11 February 2002. State in a finding <br /> whether any sensitive receptor will be impacted. <br /> Please be aware that quarterly monitoring must continue until the wells have been properly abandoned. The <br /> Sensitive Receptor Survey and your next monitoring report(third quarter 2003)are due by 30 October 2003. <br /> If you have any questions,please call me at(916)255-3115. <br /> • tN, <br /> JAMES L. BR.G. <br /> Engineering Geologist <br /> cc: Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr.Bob Bennett Silgan Containers Corporation, Riverbank <br /> Mr. Rick Caporale, Caporale Consultants, Inc., Coto De Caza <br /> California Environmental Protection Agency <br /> ;a Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your ener2v costs.see our Web-site at httn•//www—h ra <br />