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PACIFIC <br /> 6 ENVIRONMENTAL „ <br /> 1 GROUP INC <br /> pit 1 . 04 <br />' June 13, 1997 <br /> Project 310-040 6A <br />' Mr David Deaner <br /> Mr Jaynes Munch <br />' State Water Resources Control Board <br /> Division of CIean Water Programs <br /> UST Cleanup Fund <br />' 2014 T Street <br /> Sacramento, California -958I4 <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 />�i 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 /> presented as Attachment A Selected project reports used in the preparation of flus <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, San Jose, Cal itornsa 95110 (408) 441-7500 FAX (408)441-7539 <br />