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Y v <br /> PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> PEIRKPlIT/SERVICES <br /> March 24, 1992 <br /> Project 310-01.04 <br /> Ms. Penny Silzer <br /> UNOCAL Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Re: UNOCAL Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms. Silzer: <br /> This letter presents the findings of a quarterly groundwater monitoring program <br /> being conducted by Pacific Environmental Group, Inc. (PACIFIC) for UNOCAL <br /> Corporation (UNOCAL) at the site referenced above(Figure 1). The most recent <br /> groundwater monitoring event was conducted on February 19, 1992, and included <br /> the collection of groundwater elevation data and the sampling of groundwater <br /> from site monitoring wells for laboratory analysis. A brief description of additional <br /> investigation to be conducted at the site is also included. <br /> Site Conditions <br /> The site is an operating UNOCAL bulk plant with two 19,500-gallon and <br /> two 20,000-gallon above-ground storage tanks located in the western portion of the <br /> property (Figure 2). The 19,500-gallon tanks contain diesel and super unleaded <br /> gasoline, and the 20,000-gallon tanks contain regular leaded gasoline and unleaded <br /> gasoline. There is a water-supply well located on-site; and this well is <br /> approximately 80 feet deep based on information from site personnel. This well <br /> was sampled during November 1990, and did not contain detectable <br /> concentrations of total petroleum hydrocarbons calculated as gasoline (TPH- <br /> gasoline), total semi-and non-volatile hydrocarbons calculated as diesel (TPH- <br /> diesel), or benzene, toluene, ethylbenzene, and xylenes (BTEX compounds). <br /> There are currently six groundwater monitoring wells on site, designated U-1 <br /> 41 through U-b. The total depths of site wells range from 18 feet to 27 feet, and all <br /> wells are constructed of 3-inch diameter PVC casing. <br /> 1601 Civic Center Drive, Suite 202,Santa Clara, California 95050 (408)984-65:36 FAX: (408) 243-3911 <br /> 620 Contra Costa Boulevard, Suite 209, Pleasant Hill,California 94523 (510) 825-0855 FAX: (510)825-0882 <br />