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Lodi Airport Page 2 of 2 <br /> May 28, 2013 <br /> 23987 North Highway 99 <br /> Acampo, California 95220 <br /> • The nearest on-site domestic well is approximately forty-five feet from the most <br /> impacted soil petroleum hydrocarbon contamination. <br /> • TPH-ag was detected at 6,400 milligrams per kilogram (mg/kg) at approximately three <br /> feet below surface grade (bsg) in soil sample P-4 on 18 June 1999 and remedial efforts <br /> have not been implemented; <br /> • As stated in the second paragraph above, high concentrations of TPH-ag, benzene, <br /> toluene, and ethylbenzene were detected in soil gas samples collected from soil vapor <br /> samples V100 through V102; this followed the collection of soil gas samples in March <br /> 2009 in which TPH-ag was detected at 1,960,000 micrograms per cubic meter (pg/m3), <br /> 73,500 Ng/m3, and 138,000 pg/m3 in soil gas samples V6, V7 and V8, respectively (well <br /> above the ESL of 29,000 pg/m3). <br /> Based on the information presented above, the EHD does not consider this site ready for <br /> closure consideration at this time. As stated in an EHD email dated 07 March 2013 to AGE, the <br /> risk to human health posed by the site specific conditions, listed in the bullets above, must be <br /> adequately addressed. Please submit your response to the EHD by 09 August 2013. <br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209) 468- <br /> 9852, or by email at vmccartnevP-sicehd.com. <br /> Sincerely, <br /> v�� Nuel C. Henderson, Jr., PG <br /> art <br /> Victoria L. McCney, REHS 9 g Engineering Geologist <br /> Senior Registered Environmental Health Specialist <br /> c. Mr. William Little, PG, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />