Laserfiche WebLink
California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swreb.ca.gov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 29 November 2001 <br /> Mr. Ed Stetson <br /> Silgan Containers Corporation <br /> 1815 Navy Drive <br /> Stockton, CA 95206 <br /> REVIEW FINAL CLOSURE REQUEST REPORT <br /> SILGAN CONTAINERS, 1815 NAVYDRIVE, STOCKTON, SANJOAQUIN COUNTY <br /> I reviewed the 15 October 2001 Final Closure Request(Closure Request) submitted by Caporale <br /> Consultants, Incorporated (Caporale) on behalf of Silgan Containers. The Closure Request presents the <br /> latest groundwater monitoring results for groundwater samples collected on 31 August 2001, and a <br /> summary of previous soil and groundwater sampling at the subject site. <br /> Six on-site monitoring wells were installed in early 1990, and sampled on 2 February 1990. Low <br /> concentrations of trichloroethylene (TCE) and 1,2-dichloroethene (DCE) as well as minor ethyl benzene <br /> and xylene constituents were identified in GW-2. The wells were not sampled again until July 2001, <br /> when I requested a site status report. <br /> All six monitoring wells were sampled on 6 July 2001, and three of the six wells (GW-1, GW-2, and <br /> MW-1)were sampled again on 31 August 2001. Total petroleum hydrocarbons as waste oil (TPHmo), <br /> toluene, ethyl benzene, xylenes, and various volatile and semi-volatile organic compounds were <br /> identified in groundwater samples from both events. TPHmo was only detected in monitoring well <br /> GW-1 (located within the former tank pit excavation) at a maximum concentration of 7,600 micrograms <br /> per liter(µg/1). DCE was identified in monitoring wells MW-1 and GW-2 at a maximum concentration <br /> of 47 µg/1, and vinyl chloride was identified in GW-2 at a maximum concentration of 8.4 µg/1. The <br /> DCE and vinyl chloride concentrations are believed to be break down products from the TCE identified <br /> in groundwater in 1990. <br /> Based on the Closure Request and previous reports submitted for this site, the extent of groundwater <br /> contamination remains undefined, and concentrations remaining in groundwater exceed Maximum <br /> Contaminant Levels (MCLS). In the Conclusion section of the Closure Request, Caporale stated, "...the <br /> groundwater associated with this site and surrounding area is non-beneficial use and not a primary <br /> source of drinking water". The Regional Water Quality Control Board Basin Plan for the Sacramento <br /> and San Joaquin River Basins states that groundwater within these areas is designated as municipal and <br /> domestic water supply. Although the groundwater in the immediate area is not being used for municipal <br /> and domestic water supply, it recharges to aquifers where water is currently being used. The <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 energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />