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.., <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> r. 600 East Main Street <br /> y 1 Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ILI Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> cq•. P • Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> March 4, 2010 <br /> Jon Armstrong Albert Scannavino <br /> BP West Coast Products LLC Scannavino Properties <br /> 501 Westlake Park Boulevard 5463 Cherokee Lane <br /> WL 1-28. 160D Stockton, CA 95215 <br /> Houston, TX 77079 <br /> Subject: ARCO Station #595 <br /> 6100 North Highway 99 <br /> Stockton, CA 95212 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Third <br /> Quarter 2009 Groundwater Monitoring Report (Report), dated February 17, 2010, submitted <br /> on your behalf by ARCADIS. The Report documents a routine groundwater monitoring and <br /> sampling event conducted at the above referenced contaminated underground storage tank <br /> (UST) site on August 15, 2010. <br /> In the Report Arcadis recommends destruction of groundwater monitoring wells MW-9 and <br /> MW-10R, cessation of sampling of domestic well DW-2, and removal of DIPE, TAME, ETBE <br /> and ethylene dibromide (EDB) from the list of analytes for all wells. <br /> The EHD does not approve destruction of the monitoring wells. Both wells currently <br /> represent the lateral extent of the shallow plume; MW-1 OR has had reported detections of <br /> 1,2-dichloroethane (1,2-DCA) which is one of the contaminants of concern at this site. The <br /> sampling frequency of these two wells may be reduced, however, to biennial. The EHD <br /> approves cessation of sampling DW-2 and modifying the list of analytes, as proposed. <br /> Replacement wells were installed and resumption of routine monitoring and sampling of this <br /> site occurred in fourth quarter 2008. The groundwater analytical results reported from the <br /> new wells indicate the vertical extent of the contamination has not been defined. Before the <br /> investigation of this site was interrupted to allow for the road construction project there was <br /> an approved work plan for installation deeper groundwater monitoring wells. The EHD <br /> requested that you install these approved deeper wells during the fourth quarter 2008 phase <br /> of work, but you chose not to. <br /> On December 29, 2005 three 12,000-gallon gasoline UST's, dispensers and associated <br /> piping were removed from the site under permit and inspection by the EHD. Three 'hot spots' <br /> of petroleum hydrocarbon contaminated soil were found; one at dispenser DI-1, one at <br /> dispenser DI-4 and one in the southwest corner of the UST tank excavation, PB-3. An <br /> attempt to over excavate each of these areas was made, but site accessibility issues and <br /> equipment limitations resulted in impacted soil being left behind. Laboratory analysis of <br />