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National Freight Page 2 <br /> 2850 Loomis Road September 22, 2009 <br /> Stockton, California 95205 <br /> I <br /> • Although TPH-d was primarily detected in soil at depths greater than ten feet <br /> below surface grade (bsg), high concentrations (1,400 milligrams per <br /> kilogram) of TPH-d were detected ins allow soil samples collected at four <br /> feet bsg and were not addressed in this report. <br /> i <br /> • Soil sample concentrations from MW-1, -2, MW-3, and MW-2, identified by <br /> AGE as non-detect, were collected at ten feet bsg or deeper and do not apply <br /> to petroleum hydrocarbon contamination detected at four feet bsg. <br /> If the above-mentioned vapor intrusion concerns can be adequately addressed and <br /> technically justified without collecting soil gas samples, then submit a comprehensive <br /> closure summary report and include this information for soil vapor survey. In addition, <br /> please include estimates of the residual TPH-d mass in soil in the closure summary <br /> report and submit the report to the EHD by November 23, 2009. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by <br /> email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS V Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Timothy L. Cuellar, Advanced GeoEn ironmental, Inc., 837 Shaw Road, <br /> Stockton, California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board <br /> Central Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, <br /> California 95670 <br />