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URS i <br /> February 18, 2005 2065 FEB <br /> 22 <br /> JeffreyPH 12; 32 � <br /> Wong S�;Fd r• � ., <br /> i San Joaquin Public Health Service l;N 1001 '1 C0l1dyT y <br /> Environmental Health Division NEA L Ty pEP4 NTA L <br /> 304 E. Weber Avenue,Third Floor THEN 1r <br /> f Stockton, California 95202 <br /> Jim Barton <br /> California Regional Water Quality Control Board } <br /> Central Valley Region M <br /> 11020 Sun Center Drive#200 <br /> l <br /> Rancho Cordova, CA 95670-6114 <br /> SUBJECT: Additional 1,2-DCA Investigation and Site Conceptual Model <br /> And Second Quarter 2004 Quarterly Monitoring'Report <br /> Former American Forest Products Facility <br /> R <br /> �. 2801 West Lane <br /> Stockton, California <br /> URS Project No. 17322736 <br /> Dear Sirs: <br /> ' On behalf of American Forest Products Company LP, URS is pleased to deliver the above-referenced <br /> report. This report presents additional data collected to delineate 1,2-DCA impacts in groundwater and <br /> also provides a site conceptual model. <br /> 1 <br /> 3 <br /> The principal field tasks described by this report are four quarters of groundwater monitoring and <br /> installation and sampling of two additional groundwater monitoring wells. Quarterly groundwater <br /> monitoring was restarted at the site with a sampling round conducted in June 2003. The objective of the <br /> �- monitoring was to demonstrate the stability or decrease over time of concentrations of 1,2-DCA in <br /> groundwater. The objective of the well installation was to assess 1,2-DCA impacts at the depth of <br /> historic low groundwater levels, and to demonstrate the low concentrations and limited downgradient <br /> # extent of 1,2-DCA in groundwater. This report incorporates groundwater monitoring data through the <br /> second quarter 2004. As such it also serves as the quarterly monitoring report for that period. <br /> This work has been completed in response to a letter from Jeffrey Wong dated April 21, 2003 and to <br /> t „ provide data demonstrating limited extent and stability of groundwater contaminants as a basis for site <br /> closure. The work described herein was completed in accordance with the requirements presented by San <br /> Joaquin County in their letter of April 16, 2003. <br /> Please call me with questions or comments at(916) 679-2293. <br /> Sincerely, <br /> t i <br /> Anthony Min ling,R.G.` <br /> > Senior Geologist <br /> cc: Mr. William Bergvall <br /> Consultant for American Forest Products Company LP <br /> 2977 Ygnacio Valley Road <br /> Walnut Creek, California 94598 <br /> URS Corporation <br /> N Crown Corporate Center <br /> 2870 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel:916:679.21100 <br /> Fax:916.679.2960 KAWprocess1227361Ameriean Forest\Well Installation Report revOl.doc <br /> 1 <br /> I <br /> i <br />