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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> June 13, 1997. IR . , F ' V E C. <br /> Project 310-040.6A JUN 17 1997 <br /> Mr. David Deaner (j S? C,�-i A.i1iii U;N0 <br /> Mr. James Munch <br /> State Water Resources Control Board <br /> Division of Clean Water Programs <br /> UST Cleanup Fund <br /> 2014 T Street <br /> Sacramento, California -95814 <br /> Re: Underground Storage Tank Case Review/Closure Report <br /> Former Unocal Station 2859 <br /> 1665 Pacific Avenue at Walnut Avenue <br /> Stockton, California <br /> Dear Mr. Deaner and Mr. Munch: <br /> On behalf of Unocal Corporation (Unocal), Pacific Environmental Group, Inc. <br /> (PACIFIC) has prepared this letter in request of case review and closure status for the <br /> site referenced above. All information requested in the State's guidance letter dated <br /> January 3, 1997 has been provided. References to specific request items are indicated <br /> adjacent to topic headings. A completed Underground Storage Tank Review Form is <br /> preseried as Attachment A. Selected project reports used in the preparation of this <br /> document are also enclosed- <br /> PACIFIC considers this case eligible for no further regulatory action on the following <br /> basis: <br /> • All hydrocarbon sources (piping and underground storage tanks <br /> {USTs]) have been removed from the site. <br /> • The local oversight agency has determined that "...the assessment of <br /> the lateral extent of groundwater contamination is complete, the <br /> assessment of soil contamination is complete, and the plume appears <br /> stable." (Letter from San Joaquin County Environmental Health <br /> Division dated January 9, 1997 - Attachment B.) <br /> • Hydrocarbon-impacted soil was excavated from the site to an average <br /> depth of 26 feet in 1988. In addition. approximately 2,745 pounds of <br /> 2025 Gateway Place, Suite 440, sin Kase. California 951 10 (4013) 441-7500 FAX (408) 441-7539 <br />