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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> January 4, 1993 <br /> Project 310-01.03 JAN 0 6 1993 <br /> Ms. Penny Silzer ENVIRONMENTAL HEALTH <br /> Unocal Corporation <br /> PERMIT/SERVICES <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 has been prepared by Pacific Environmental Group, Inc. (PACIFIC), to <br /> document the findings of a file review conducted for the vicinity of the site refer- <br /> enced above. This file review was originally recommended in a PACIFIC.Soil and <br /> Groundwater Investigation report dated June 11, 1992. The completion date for <br /> this task was modified in a PACIFIC letter to Unocal Corporation (Unocal) and <br /> the San Joaquin County Public Health Services Department (SJCPHSD), dated <br /> December 11, 1992. <br /> The purpose of this file review was to evaluate known petroleum leak cases in the <br /> vicinity of the site. The files of the SJCPHSD and the Central Valley Region <br /> office of the Regional Water Quality Control.Board (RWQCB) were reviewed, <br /> and two documented fuel leak cases were identified within the vicinity of the site. <br /> The investigations at these sites are summarized below. <br /> GENSTAR WESTERN STONE PRODUCTS <br /> An environmental investigation is currently being conducted at the Genstar <br /> Western Stone Products (GWSP) facility located at 8181 East 11th Street, C <br /> approximately 150 feet to the east of Unocal Bulk Plant 0788 (Figure 1). The <br /> GWSP site is located in the hydraulic crossgradient to upgradient direction from <br /> the Unocal site. <br /> 2025 Gateway Place, Suite 440, San Jose,California 95110 (408)441-7500 FAX (408)441-7539 <br /> 620 Contra Costa Blvd., Suite 209, Pleasant Hill, California 94523 (510) 825-0855 FAX(510) 825-0882 <br />