Laserfiche WebLink
�nt <br /> STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL E OARD— <br /> CENTRAL VALLEY REGION -� <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> J <br /> 1 i! �989 <br /> 2 June 1989 <br /> i <1, bac. <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 SERVICE STATION, 941 EAST YOSEMITE <br /> AVENUE, MANTECA, SAN JOAQUIN COUNTY <br /> We have reviewed the 3 January 1989 Prelimi ary Report (PR) for this site and <br /> find the PR to Abe incomplete. Additional` s to information and investigative <br /> work is needed to complete the site assessment. The following information <br /> should be submitted in an Addendum to the 3 January 1989 PR: <br /> 11. 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 /> 2. A 'site map indicating the sample loca ions for each sample collected <br /> from the tank pit on 11 February and 4 March 1988. <br /> 4/3. The location of each tank labeled by ontents should be shown on a site <br /> map. <br /> CPN'(�4. The layout of all existing and former product pipelines should be shown <br /> on a site map. Their depths below gr de should be specified. Were the <br /> �ti <br /> - -—p � Anes j"enfova when} �,�� tan°kSgN�re' excavat4ci?A I`f not; trier n@cu -#o <br /> N N-., _ <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 d pths below grade and outside <br /> diameters? Are either of their trent es 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 appy ximately 23 feet below grade. We <br /> recommend that the extent of hydrocarbon co taminated soil be defined prior to <br /> initiating remedial action. The north, eas and west soil contamination <br /> i boundaries are unknown. We can understand he reasoning for removing the <br /> source, but should soil contamination exteni over a wide area it may be more <br /> cost effective to initiate some other type f remedial action other than <br /> excavation of only the tank pit. <br />