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STATE OF CALIFORNIA <br /> GEORGE DEUKMEJIAN,Governor i <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL OARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3088 i <br /> 2 June 1989 <br /> Ms. Diane Hinson <br /> San Joaquin Local Health District <br /> P. O. Box 2009 <br /> Stockton, CA 95201. <br /> PRELIMINARY REPORT FOR FORMER TEXACO SERVIC17 STATION, 941 EAST YOSEMITE <br /> AVENUE, MANTECA, SAN JOAQUIN COUNTY <br /> We have reviewed the 3 January 1989 Preliminary Report (PR) for this site and <br /> find the PR to ;be incomplete. Additional site information and investigative <br /> work is needed to complete the site assessment. The following information <br /> A-1. <br /> should be submitted in an Addendum to the 3 January 1989 PR: <br /> Copies of the Canonie Environmental Services Laboratory Report <br /> No. 85-052-3580 and No. 85-052-3776 for samples collected in the tank <br /> pit on 11 February and 14 March 1988, respectively. <br /> i <br /> 2. A site map indicating the sample locations for each sample collected <br /> from the tank pit on 11 February and 14 March 1988. <br /> f3. The location of each tank labeled by contents should be shown on a site <br /> map. <br /> The layout of all existing and former product pipelines should be shown <br /> on a site map. Their depths below grade should be specified. Were the <br /> pipelines removed when the tanks were excavated? If not, the; need to <br /> be removed. <br /> 5. Specific details on the sewer and water lines adjacent to the tank pit <br /> should be supplied. What are their depths below grade and outside <br /> diameters? Are either of their trenches deep enough to act as conduits <br /> for hydrocarbon migration from this site? <br /> In the PR the consultant recommended excavating the "initial tank cavity" ► <br /> vertically to the ground water surface approximately 23 feet below grade. We <br /> recommend that the extent of hydrocarbon contaminated soil be defined prior to <br /> initiating remedial action. The north, east and west soil contamination <br /> boundaries are unknown. We can understand the reasoning for removing the <br /> source, but should soil contamination extend over a wide area it may be more <br /> cost effective to initiate some other type of remedial action other than <br /> excavation of only the tank pit. <br />