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N <br /> 1612 Hammer Lane <br /> page 2 of 2 <br /> i <br /> Soil vapor extraction well VW-5S was built with a screened interval extending from 5- 15 <br /> feet below surface grade (bsg), and while depth to water across this site has ranged <br /> from approximately 25-30 feet bsg since it was installed , the measured depth to water in <br /> this well has ranged from approximately 9- 15 feet bsg . No comment on or explanation <br /> for this anomaly has been made by your consultants . This well is built in the same <br /> borehole as VW-5D, whose depth to water has consistently measured within the normal <br /> range for the site. <br /> If you choose to discontinue the interim remediation of SVE/AS at this site you may do <br /> so. SJC/EHD directs that you proceed with submittal of the previously requested work <br /> plan to investigate the vertical extent of the groundwater contamination, and to install <br /> monitoring wells that will intercept first groundwater. In addition , a site conceptual model <br /> must be prepared. These items due for submittal to SJC/EHD no later than <br /> August 30 , 2004. <br /> If you have any questions please call Lori Duncan at (209) 468-0337 <br /> j Donna Heran , REHS , Director, <br /> I{ Environmental Health Department <br /> Lori Duncan , Senior REHS Nuel C . Henderson , Jr. , RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton , CVRWQCB <br /> Vernon Elarth , URS <br />