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9 � <br /> Cherokee/Delta Truck (former) page 2 <br /> 3535 Cherokee Lane, Stockton. <br /> Adequate soil samples are to be collected and analyzed from this/these wells installation(s) to <br /> support delineation conclusions for MtBE and DCE, as well as TPH and BTEX. Any soil <br /> contamination detected in this area (down-gradient) of the main residual core area is to be <br /> delineated in an additionally required investigative phase in the very near future. <br /> MtBE and DCE have been detected in monitoring well "UST-6", down-gradient from the former <br /> large UST pit. Soil boring "B-14" placed in the former UST pit and up-gradient to UST-6 was <br /> drilled in June 1999 but the grab groundwater sample collected from the sand lens at <br /> approximately 65' bgs but was not analyzed for DCE. A groundwater investigation for the lateral <br /> limits of the 4.0 µg11 DCE detected in UST-6 is to be conducted if the multi-zoned monitoring <br /> well described previously in this correspondence support conclusions that the DCE is migrating <br /> laterally through the sandy zone at 65' bgs. <br /> It is the conclusion of PHS-EHD and the CVRWQCB that the contaminant mass of the soil and <br /> groundwater contamination should be reduced by active remediation prior to evaluating any <br /> additional request for No Further Action. <br /> 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 Code 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. PHS-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 alternatives. The report of findings for this <br /> required investigation phase is to include remedial alternative 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, 2001 along with a <br /> well permit application form and fee. <br /> Please address your submittals to Michael Infurna and you may contact him with any questions <br /> you may have at (209) 468-3454. <br /> Donna Heran, REHS <br /> Director, Environmental Healto Divisi n <br /> /Michael J. Infurna, Senior REHS Marga�IagoriAoXr <br /> Site Mitigation-LOP Unit IV Supervisor <br /> Ml/ <br /> c: AGE — Paul Dobson, 837 Shaw Rd, Stockton. <br /> C: CVRWQCB — Marty Hartzel, Sacramento. <br /> C: SWRCB-CUF — Mark Owens, Sacramento. <br />