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r Laboratory Procedures <br /> Soil gas samples were submitted under appropriate chain-of-custody documentation to <br /> Sequoia Analytical Laboratories, a Tosco-approved state-certified analytical laboratory The <br /> samples were analyzed for total purgeable petroleum hydrocarbons calculated as gasoline in <br /> accordance with EPA Method 8015 (modified), and benzene, toluene, ethylbenzene, xylenes, <br /> and methyl-tert butyl ether (MtBE) in accordance with EPA Method 8020 Additionally, if <br /> MtBE was detected, the soil gas sample indicating the highest MtBE concentration by EPA <br /> Method 8020, was analyzed in accordance with EPA Method 8260, to confirm the presence <br /> of MtBE <br /> FINDINGS <br /> The soil gas survey findings are presented on the attached Field Data Sheet and Soil Gas <br /> Sample Analysis Report <br /> CLOSING <br /> This report and all field activities described within were performed by the staff of PACIFIC <br /> under the professional supervision of the project geologist whose signature appears hereon <br /> Should you have any questions concerning the contents of this report, please call <br /> • Sincerely, <br /> Pacific Environmental Group, Inc. <br /> Joseph Muzzio <br /> Project Geologist <br /> CEG 1672 <br /> Attachments Field Data Sheet <br /> Soil Gas Sample Analysis Report <br /> Chain-of-Custody Documentation <br /> Site Plan <br /> 3111631 A`5417 3 October 29, 1997 <br />