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Gurpal S Sidhu <br />Waterloo Feed and Fuel <br />3032 E. Waterloo Road <br />Page 2 of 2 <br />(bsg), is not well delineated except primarily by cone penetration testing (CPT) data toward <br />the north (CPT-7), data from former monitoring well MW-8 toward the east-southeast and <br />CPT data toward the southwest obtained from CPT-5 and CPT-6. Groundwater in deeper <br />intervals in CPT-6 was impacted. Additional investigation and characterization of shallow <br />groundwater is needed. Lower monitored intervals appear to have somewhat better <br />delineation in some directions. Please review the data for lateral (horizontal) delineation in <br />each depth interval currently monitored and submit a work plan to install additional <br />groundwater monitoring wells to complete the lateral delineation of impacted groundwater in <br />each monitored depth interval, especially the upper two intervals. <br />Please submit the work plan to install shallow and deep monitoring wells as directed in this <br />letter to EHD no later than 15 January 2007. The EHD recommends that continuous cores <br />be collected across the target depths to verify placement of screens in appropriate soil <br />lithology. Due to several unresolved issues with continuous multi-chamber tube (CMT) wells, <br />it is unlikely the EHD will approve installation of more of these wells at this time. <br />The EHD has been informed that initiation of the interim soil vapor extraction (SVE) system <br />installed on your site is likely to start in December 2006. The EHD views this action as critical <br />to reduce contaminant flux from soil to groundwater. Please keep the EHD informed as to <br />scheduled events for getting the system operational and any problems or delays as they <br />occur. <br />You may contact Harlin Knoll at (209) 468-3442 or Nuel Henderson at (209) 468-3436 if you <br />have any questions. <br />Donna Heran, REHS, Director <br />Envi onmental Health Department <br />Harlin Knoll, Senior REHS <br />Nuel C. Henderson Jr., PG <br />LOP/Site Mitigation Unit IV <br />Engineering Geologist <br />LOP/Site Mitigation Unit IV <br />c: CVRWQCB — James L. Barton, PG <br />AGE. — William Little, PG