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Office of Environmental Health Hazard Assessment <br /> Joan en <br /> \ TDton,Ph.D.,Director Headquarters•301 Capitol Maa ll,Rm.205•Sacramento,California 95814-4308 <br /> Qa; Oakland Office•Mailing Address: 1515 Clay Street, 16th Floor•Oakland,California 94612 <br /> \ti insron H.Hickox MEMORANDUM <br /> ° <br /> Agency Secretary of <br /> Gray Davis <br /> Goveraar <br /> TO: Philip S. Isorena <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> Via: David Siegel, Ph.D., DA13T <br /> Chief <br /> Hazardous Waste Toxic/ology Section <br /> FROM: Susan , Ph.D., DABT <br /> Staff Toxicologist <br /> DATE: April 20, 2000 <br /> SUBJECT: REVIEW OF THE HEALTH RISK ASSESSMENT FOR FORMER LYOTH - <br /> LOADING STATION, TRACY, CALIFORNIA - <br /> Background: <br /> The site was developed in 1913 and was used until 1953 as a transfer point for fuel oil <br /> received from Standard Oil Company of California's (predecessor to Chevron)Richmond, <br /> California, refinery for loading onto locomotives,rail cars, and trucks. The site consisted of one <br /> 55,000-barrel and two 35,000-barrel above ground tanks, a pump station, and associated <br /> structures. In addition to the loading operations at the site, crude oil was pumped through <br /> Standard Oil Company of California's former Wait-Mendota-Richmond pipeline system, known <br /> as the Old Valley Pipeline, which was located along the northeast border of the property. A tar- <br /> like material oozed to the surface in two locations, and this was investigated by EMCON in <br /> 1990, 1994, and 1995, and by Geomatrix in 1997. The document states that the site is <br /> anticipated to remain a commercial/industrial site for some time. <br /> Comments: <br /> Most of the soil boring samples were analyzed for Total Petroleum Hydrocarbons (TPH), <br /> specifically TPHg (gasoline) TPHd (diesel), TPHc (crude oil) and TPRH. A limited number of <br /> samples were analyzed for benzene, toluene, ethyl benzene, and xylene(BTEX) in 1994 and <br /> 1995 by US EPA Method 8020 and PAHs by US EPA Method 8310. High concentrations of <br /> petroleum products were found by the nonspecific methods. For example, 15,900 mg/kg TPHd <br /> was detected in 1990 in boring B-1 through 136; MW-1 and MW-2 and 70,000 mg/kg TRPH was <br /> detected in 17 to 23 samples in 1994 in borings B-7 to B-21. TPHc was detected in 8 of 25 <br /> California Environmental Protection Agency <br /> �s <br /> ip"h' Printed on Recycled Paper <br />