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Chevron ' <br /> Chevron Corporation <br /> 575 Market Street, San Francisco, California <br /> Mail Address:P0.Box 7924,San Francisca,CA 94120-7924 n�T��^7 19 1111 1991 <br /> re <br /> CERTIFIED MAIL <br /> APR 2 3 "^9 <br /> RETURN RECEIPT REQUESTED ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> PAUL D. HOFFMAN & SONS <br /> TRACY, CALIFORNIA <br /> Mr. Larry Pierson <br /> California Regional Water Quality Control Board <br /> 3443 Routier Rd. <br /> Suite A <br /> Sacramento, CA 95827-3098 <br /> Dear Mr. Pierson: <br /> Standard Oil Company of California (Socal, which changed its name <br /> to Chevron Corporation on July 1, 1984) sold the property at 26501 <br /> Banta Road in Tracy, California in 1953 . From 1910 to 1953 , this <br /> property was the site of the Lyoth Loading station which received <br /> fuel oil from the Richmond Refinery for loading onto rail cars and <br /> trucks. SocalIs Central Valley Crude Line ran along the northeast <br /> boundary of the property. The property is currently owned by Paul <br /> D. Hoffman & Sons. <br /> Paul D. Hoffman & Sons requested Chevron to conduct an <br /> environmental investigation of the site due to some petroleum-like <br /> material that had surfaced on their property. Chevron' s in-house <br /> analysis of this material indicated it was weathered crude oil or <br /> residuum. Chevron undertook a voluntary, preliminary investigation <br /> of the property to assess the impact of former site activities on <br /> soil and groundwater. The results of this investigation are <br /> presented in the attached report which we are forwarding for your <br /> information. <br /> Eight exploratory borings were drilled. Benzene and ethylbenzene <br /> were not detected in any of the sixteen soil samples; low <br /> concentrations of toluene and xylenes were detected in three of the <br /> samples. The soil sample with the highest concentration of total <br /> petroleum hydrocarbons (TPH) as diesel and a surface sample of the <br /> petroleum-like material were analyzed for volatile organic <br /> compounds using the toxicity characteristics leaching procedure <br /> (TCLP) . None of the TCLP compounds were detected. <br /> Two of the borings were completed as down-gradient monitoring <br /> wells. Analysis of groundwater samples from one of the wells did <br /> not detect TPH as diesel or benzene, toluene, ethylbenzene and <br /> xylenes (BTEX) . Groundwater at the other well is impacted as <br /> evidenced by two inches of liquid hydrocarbon. <br />