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n <br /> Cherokee/Delta Truck (former) page 2 <br /> 3535 Cherokee Lane, Stockton <br /> v <br />'' Adequate scat samples are to be collected and analyzed from this/these wells installations) to <br /> support delineation conclusions for MtBE and DCI=, as well as TPH and B717--X- Any sod <br /> contamination detected in this area (down-gradient) of the main i esidual core area is to be <br /> ry 3 delineated in an additionally required investgabve phase in the fiery near future Ji ' <br /> MtSE and OCE have been detected in moniloring well"UST-6", down-gradlent from the former " <br /> large UST pit Soil boring uB-14A placed in the former UST pit and up-gradient#o UST was <br /> drilled in .June 1999 but the grafi groundwater sample collected from the sand lens at <br /> approximately 65' bgs but was not analyzed for DCE A groundwater investigaton for the lateral <br /> limrts of the 4 Q ug/i DCE detected in UST-6 is to be conducted if the mulb-zcned mcnitonng <br /> rwell descnbed }previously in this correspondence support conclusions that the DC>E is migrating <br /> laterally through the sandy zone at 65' bgs. <br />' It is the conclusion of PHS-EHD and the CVRWQC8 that the contaminant mass of the soil and <br /> groundwater contamination should be reduced by active remediation prior to evaluating any <br /> additional request fcr No Further Action <br />'f <br /> l Although many alternatives for remedial action were discussed in the PAR, PHS-EHD requires <br /> you to evaluate them again and determine which ones you will field-test. California Cade of <br /> Regulations, Underground Storage Tank Regulations require that you evaluate at least two (2) <br /> remedial alternatives that could restore or protect the beneficial use of the aquifer PHSr-EHD <br /> recommends that the work plan to install the required multi-zoned well(s) Include work to <br /> evaluate and test two or more of the remedial a€tematives The report of findings for this <br />' required investigation phase is to include remedial altemative field test data as well as the <br /> updated conclusions required in the problem Assessment Report. <br /> The work plan for this required phase should be submitted by December 10, 2901 along with a <br /> well permit application form and fee <br /> Please address your submittals to Michael Infuma and you may contact him with any questions <br />' you may have at (209) 468-3454 <br /> , <br /> , I <br /> I <br />' Donna Heran, RENS <br /> Director, Environmental Heal Dmsi n <br /> luc d"t_t <br /> t " <br /> Michael J Infuma, Senior REHS nMaa t..agortca, R S <br /> Site Mitigation-LOP Unit IV Supervisor <br /> M11 <br /> c AGE— Faul Dobson, 837 Shaw Rd, Stockton <br /> C CVRWQCB—Marty Hartzel, Sacramento. <br /> C SWRCS-CUF—Mark Owens, Sacramento <br /> ' <br />