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i • <br />� Touchstone <br />Developments <br />Environmental Management <br />August 24, 1994 <br />Chevron U.S.A. Products Company <br />P.O. Box 5004 <br />San Ramon, California 94583-0804 <br />Attention: Brett Hunter <br />Reference: Domestic Water Well Sampling <br />Chevron Station No. 9-2396 <br />2565 Highway 99 North <br />Acampo, California <br />Gentlemen: <br />This letter has been prepared at Chevron's request to <br />document two water sampling events performed at the above <br />referenced site. On June 24, 1994 and July 28, 1994 a <br />Touchstone representative met with Harlin Knoll of San <br />Joaquin County Health Department, Environmental Health <br />Division to collect water samples from a domestic water well <br />located near the frontage road west of the pump islands. <br />A valve was placed at the well head and the well was <br />stressed by running water inside the station building. As <br />the well cycled on, water samples were collected in 40 ml <br />volatile organic analyzing glass vials (VOAs) from the <br />valve. The VOAs were checked to make sure no headspace or <br />bubbles were left in the VOAs. The VOAs were label, entered <br />on a Chain -of -Custody form, placed in a cooler on ice and <br />transported to Superior Precision Analytical, Inc., a State - <br />certified analytical laboratory located in Martinez, <br />California. <br />Four VOAs were collected during each sampling event and <br />analyzed for Total Petroleum Hydrocarbons (TPH) calculated <br />for gasoline according to EPA Method 8015 modified, Benzene, <br />Toluene, Ethylbenzene and Xylenes (BTEX) according to EPA <br />Method 8020. Samples collected from both events were not <br />detected at or above the laboratory detection limits (ND) <br />for TPH-gas and BTEX. The certified analytical reports from <br />the laboratory are attached. <br />P.O. Box 2334 • Santa Rosa, CA 93405 • Office: (707) 538-8818 • Fax: (707) 538-8812 • Mobile/Fax: (707) 484-5112 <br />