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Main Street Investors/Villas de Amistad Page 3 of 3 <br /> 601 East Main Street September 16, 2014 <br /> Stockton, California 95202 <br /> • Collect a duplicate soil gas sample in a one-liter Summa canister and analyze the <br /> sample for total petroleum hydrocarbons (TPH) as gasoline (TPH-g); benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary- <br /> butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether (DIPE), tertiary <br /> amyl alcohol (TBA), ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA) and <br /> isopropyl alcohol (IPA) by Environmental Protection Agency (EPA) Compendium Method <br /> TO-15; <br /> • Collect the replicate soil gas sample using a four-liter sorbent tube and analyze the <br /> sample and the trip blank sample by EPA Compendium Method TO-17 for naphthalene, <br /> TPH-diesel (TPH-d) and TPH-motor oil (TPH-mo); and <br /> • Use a flow rate of fifty to sixty-six milliliters per minute when using sorbent tubes to <br /> collect soil gas samples for analysis by TO-17. <br /> If you have any questions or concerns, please contact Vicki McCartney at (209) 468-9852 or by <br /> email at vmccartney@sjcehd.com <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Brian Millman, PG, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Ms. Cori Condon, PG, CHg, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />