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PACIFIC - <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> i <br /> March 18, 1993 <br /> Project 310-01.04 <br /> Ms. Penny Silzer <br /> Unocal Corporation <br /> 2006 Crow Canyon Place, Suite 400 <br /> SanRa.mon, California 94583 <br /> Re: Unocal Bulk Plant 0788 W a <br /> .8203 East 11th Street <br /> Tracy,California <br /> Dear Ms. Silzer: <br /> On behalf of Unocal Corporation(Unocal),Pacific Environmental Group, Inc. <br /> (PACIFIC)has prepared this remedial action plan for implementing interim <br /> remedial action at the referenced site (Figure 1). This plan presents the basis for <br /> interim remedial action development, a description of the proposed interim <br /> remedial action, and an implementation'schedule. <br /> SITE•CONDITIONS <br /> +' Facility Description: The site is an operating bulk plant with two 19,500-gallon <br /> and';two 20,000-gallon aboveground hydrocarbon storage tanks located in the <br /> western portion of the property(Figure 2). The 19,500-gallon tanks contain diesel <br /> andsuper unleaded gasoline, and the 20,000-gallon tanks contain regular leaded <br /> gasoline and unleaded gasoline. c"co ding to site personnel, ese a - <br /> ta e m 1918 to reel ce the abovegroun tanks originally installed daring <br /> ructl<on o-f the aciliV A water-supply well, designated WSW-1, is located <br /> near the eastern property boundary.and is used for nonpotable sanitation <br /> purposes. <br /> According to site personnel, a release occurred from the underground piping / <br /> between the aboveground storage tanks and the loading rack sometime during <br /> 1976 and was subsequently repaired. In 1976, separate-phase hydrocarbons were <br /> ri <br /> 2025 Gateway Place,Suite 440, San Jose,California 95110 (408)441-7500 FAX(408)441-7539 <br /> 620 Contr'a Costa Blvd., Suite 209, Pleasant Hill,California 94523 (510) 825-0855 FAX(510)825-0882 <br /> } q . <br />