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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryjor Sacramento blain Office Governor <br /> Environmental. 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 <br /> 4 November 2003 <br /> Mr. Ed Stetsen <br /> Silgan Containers Corporation <br /> 1815 Navy Drive <br /> Stockton, CA 95206 <br /> SITE CLOSURE REVIEWAND REQUEST MONITORING WELL DESTRUCTION.WOPKPLAN, <br /> SIL GAN CONTAINER UNDERGROUND STORAGE TANK, 1815 NA VY DRI VE, STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> I reviewed the 31 October 2003 Update on Closure Request Items for Silgan Container(Report), <br /> prepared by Caporale Consultants, Inc. (Caporale) on behalf of Silgan Containers Corporation. The <br /> Report includes the three items requested in my 26 September 2003 letter review of your 30 July 2003 <br /> Groundwater Sampling&Site Closure Report: the cis-l,2-dichloroethane(c1,2-DCE) mass estimate for <br /> groundwater; the BIOCHLOR computer modeling for fate and transport time to reach a steady state <br /> concentration below Water Quality Objectives, and to show how far the plume will travel during that <br /> time; and an updated sensitive receptor survey. <br /> Based on the low concentrations of 1,2-DCE (13 µg/L) in groundwater, which calculates to a residual <br /> mass of 0.60 pounds; a groundwater plume travel distance estimated between 40 and 200 feet, with a <br /> time of 4 years to less than 20 years to reach steady state; and a sensitive receptor survey which shows <br /> that no private or public supply wells will be impacted, Caporale requests site closure. We concur with <br /> your request for closure. By 31 November 2003, please submit a plan of work to properly destroy the <br /> seven monitoring wells. All work must be done in accordance with State and local laws, including <br /> obtaining an appropriate San Joaquin County Environmental Health Department well destruction permit. <br /> Once we receive a letter report documenting that wells have been properly abandoned (removed and/or <br /> destroyed),we can proceed with our site closure process. <br /> Please notify me at least five business days prior to any site work. If you have any questions or <br /> comments,please call <br /> calall me at (916) 255-3115. <br /> Jameft. Barton, R.G. <br /> Engineering Geologist <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, 304 East Webber <br /> Avenue, Third Floor, Stockton, CA 95202 <br /> Mr. Rick Caporale, Caporale Consultants, Inc., 19 Windflower, Coto De Caza, CA 92679 <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> c,,.-.,1;_ u,­—,man­&­demand and cut vnur enerQv ensu.see our Web-site at htto://www.swreb.ca.aov/rwgcb5 <br />