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URS RECEYEB <br /> ' AeK 3 0 2010 <br /> April 29, 2010 ENVIRONMENT HEALTH <br /> Mr. James Barton PERMIT/SERVIGES <br /> 06a3 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova, CA 95670-6114 <br /> ' Reference: First Quarter 2010 Groundwater Monitoring Report <br /> Frank's One Stop <br /> ' 2072 West Yosemite Avenue,Manteca, California <br /> RESD Contract No. 3105537 <br /> URS Project No. 17326087.01001 <br /> ' Global ID No. T0607700558 <br /> Dear Mr. Barton: <br /> ' URS Corporation Americas(URS)has prepared this report on behalf of the State of California—Real <br /> Estate Services Division(RESD)under Contract No. 3105537. This report summarizes the results of <br /> groundwater monitoring and domestic well sampling activities conducted at Frank's One Stop(site), <br /> ' located at 2072 West Yosemite Avenue in Manteca, California(Figure 1), during March 2010. <br /> During the fourth quarter 2009, MTBE was detected in 17821-GAC2 and 17926-GAC1.A carbon <br /> ' change out was performed at these two locations prior to the first quarter 2010 sampling event. <br /> The following paragraphs present a summary of activities including background, sampling activities, and <br /> ' analytical results. This report relies on background information, including analytical data,which has <br /> been furnished to URS by RESD and/or other third parties.URS has relied on this information as <br /> furnished, and is neither responsible for nor has confirmed the accuracy of this information. <br /> BACKGROUND <br /> The site is a retail gasoline and diesel service station with additional on-site businesses, such as <br /> ' automotive repair,bait shop,mini market,U-Haul truck rental, and propane sales. A site map is provided <br /> as Figure 1. The following description of previous activities has been compiled from reports prepared by <br /> Aqua Science Engineers, Inc. (ASE). <br /> tIn response to a release identified from the dispensers, as well as inconsistencies in the fuel <br /> reconciliation logs, in February 1995, Geological Audit Services of Stockton, California, drilled 13 soil <br /> ' borings (GB-1 through GB-10, ISLAND 1, IS, and IW) at the site. During this investigation, significant <br /> concentrations of total petroleum hydrocarbons(TPH) as gasoline (TPH-G); TPH as diesel (TPH-D); <br /> and benzene,toluene, ethylbenzene, and total xylenes(BTEX)were discovered in the subsurface soils <br /> and groundwater. The highest concentrations were detected in samples collected northwest or adjacent to <br /> ' the underground storage tanks (USTs), and in samples collected adjacent to the diesel fuel dispenser. <br /> In April 1997,Remedy, Inc. of Fremont, California, drilled 10 soil borings (B-1 through B-10)to further <br /> define impacted soil and groundwater at the site. During this investigation,methyl tertiary butyl ether <br /> ' URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 150 <br /> Sacramento, CA 95833 <br /> Tel: 916.679.2000 <br /> Fax:916.679.2900 H\Wprocess\RESD\Franks One Stop\QTR 10\IQMR10 Report doc <br />