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Mar-05-02 03:27pm From-TRIHYDRO C""° +3077457729 T-080 P-002/003 F-216 <br /> California Regional Water Quality Control Board <br /> Central Valley Region - <br /> �,Vis�Stane1caY Robert Schneider, Chair <br /> Gray Davis <br /> Serrttary for saera=nto moln offlee Governor <br /> Em�[}onmexzn! ItIE=aAddress: htcpJ/www-wrob.cs.govharc{cb5 <br /> pr0iecdar. 3453 Routi�Road.Suits A,S= nw,Califomia 95827-3003 <br /> Phase 016)255-30oa-rAX(916)25$,3015 <br /> 11 February 2002 �I /� <br /> 2vlr.Ed Stetson � \ <br /> Silgan Containers Corporation <br /> 1815 Navy Drive <br /> Stockton, CA 95206 <br /> RETZW WOR"LANFOR ADDrITONAL GROUNDWATER ASSESSMENT <br /> SLLGAN CONTA NE,RS, 181 S NAVYDRIVE,S,TOCKTON, SAN JOAO t1IN COUNTY <br /> I reviewed the 6 February 2002 Workplan (Workplan) submitted by Enfra LLC (Enfra) on behalf of <br /> Silgan-Containers. The Workplan,presents a scope to work to destroy one soil vapor extraction well, and <br /> install two additional groundwater monitoring wells downgradient of the source area- <br /> The <br /> reaThe workplan is approved with the following comments: <br /> • San Joaquin County Well Standards requires wells in areas of known contamination to be destroyed <br /> by over drilling to remove the well casing, sanitary seal, and filter pack, and the borehole to be filled <br /> with cement slurry. All well destruction(and construction)perna,its'must be secured through the San <br /> Joaquin County Environmental Health Department at(209)468-3420. <br /> • The proposed location of the two monitoring wells downgradient of dLe source area is acceptable. <br /> The proposed total depth of 25 feet may not be acceptable due to coimpletin,g the wells inside the <br /> Silgan Containers building,which has an added foundation of approximately six feet- Please <br /> construct the water table monitoring wells with a 15-foot screen interval placed with five feet above; <br /> and ten feet below the water table. <br /> • In our 29 November 2001 letter,we requested you to update the well recc-ptor survey presented in the <br /> 13 March 1990 Phase H Site Characterization Report Please include the updated well receptor <br /> survey in your summary of groundwater assessment report. Please note that report and workplans <br /> that contain engineering, and/or geology information must be prepared under the direction of <br /> properly licemcd individuals in the State of California(California Business and Professions Code). <br /> Quarterly monitoring duriuS the fourth quarter of 2001 was act cozupleted as requested, and the <br /> Workplan did not include a schedule to start work. Therefore,please complete the proposed well <br /> installation and quarterly monitozing by the end of this calendar quarter, and submit your report by <br /> 30 April 2002. <br /> Califomia Environmental.Protection Agezzcy <br /> VI?x&aycrad Paper <br /> Tlie=ergy chai(mge Ucina Califomia is real. Every Colifomix heeds=mke 4mmediate actian to eaduae mugy consuroFuoa- <br /> For a fist of ample w2.ys you c=reLrc demand nna zat your eaer�y cuts,sa utz website-L htrpJ/www4wmb.ca zovi wQebs <br />