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Quik Stop Market No,132 <br /> 3555 West Hammer Larre page 2 <br /> June 5,2009 <br /> Stockton,California 95209 <br /> ATC proposes to advance borehole SB-5 approximately eight feet I cast of soil boring SB-1, <br /> nort It <br /> initially to an approximate depth of fifteen,ficet bsg. One soil sample is proposed to be collected <br /> at the capillary fringe, and one, grab groundwater sample is proposed to be collected at <br /> approximately fifteen feet bag, Then ATC proposes to advance the boring to approximately forty <br /> feet bsg and collect' a grab groundwater sample. Instead of the proposed boring, the EHD <br /> 'believes a monitoring well should be installed adjacent to soil boring ATC-5, and screened <br /> between approximately twenty and twenty-five feet bsg.Noting that UME was detected at 2,900 900 <br /> ug/L in a grab groundwater sample collected at twenty feet bsg from ATC-5, the MID believes a <br /> Elmonitoring well will better address the possible plume migration down gradient of the source <br /> area. <br /> l <br /> ATC proposes to continuously core borehole SB-6 approximately twenty feet southwest of (_ <br /> ,borehole SB 2, to approximately forty feet bsg for ;ithological evaluation and field screening, <br /> E One soil sample is proposed to be collected at the capillary fringe at approximately ten feet bsg or <br /> .at:a depth identified to have significant volatile organic contamination_ based on readings from a <br /> photo-ionization detector. ATC also proposes to collect additional soil samples for chemical <br /> analysis if unsaturated soils are encountered between the shallow and deep groundwater zones. <br /> ATC, proposes to collect grab groundwater samples from the shallow zone of approximately <br /> fifteen feet bsg,and from the deep zone of approximately forty fiect bag. The ETID approves the <br /> advancement of SB-6 as described. <br /> Please respond to concerns and recommendations presented in this letter to the EJID by August 3, <br /> '2009. If you have any questions regarding this letter,please contact Vicki'McCartney at(209) <br /> 4168-98,52 orb email at vmcc*rthey@qjcehJxom. <br /> nn Sincerely, ii <br /> E3 � <br /> Victoria L.McCartney,REH8 NuerC,Henderson,Jr.,PG <br /> Senior Registered Environmental Health SptildValist Engineering Geologist <br /> 6: Scott Perkins, ATC Associates Incorporated, 6602 Owens:Drive,,?teasariton, California..l <br /> 94588 <br /> Mr.James L.L.Barton,PG,California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive,Suite 200,Rancho Cordova,lCalifomia 95670 <br /> tj <br /> ji <br />