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Ultramar#419 page 2 <br /> 2350 E Waterloo Rd , Stockton <br /> tIn conversations with State Water Resources Control Board (SWRCB) Clean Up Fund <br /> (CUF) staff, it was discussed that Ultramar's assertive proposals to possibly install <br /> multiple, dual-casing soil vapor extraction wells could be interpreted as technically <br />' effective, but costly if actual vapor testing indicated that this process was not effective <br /> An evaluation of two remedial alternatives and their cost-effectiveness is required before <br /> any site can proceed to the remediation phase <br />' PHS-EHD cautions Ultramar that if conclusions in the tY required Feasibility Stud indicate <br /> q Y <br /> that an alternative remediation method is considered more cost-effective, the costs of <br />' installing the proposed multiple, dual casing vapor extraction well(s) may not be fully <br /> reimbursed and costs for the required alternate method of remediation may not be <br /> reimbursed SWRCB-CUF staff has requested that the final proposal approved by PHS- <br />' EHD be sent to them for pre-approval of costs before the field work is initiated <br /> PHS-EHD can approve the "Letter Amendment to Work Plan" once the air sparge well <br />' option and notations to the specific sections noted above are addressed satisfactorily If <br /> Ultramar chooses to waive obtaining pre-approval of costs for reimbursement, it should <br /> be noted in this amendment's revision to PHS-EHD <br /> The boring permit application, $89 permit fee, and the access agreement noted in PHS- <br /> EHD's October 13, 1997 correspondence is stili to be submitted prior to final approval of <br />' the workplan <br /> Please continue to direct your submittals to Michael Infurna, Senior REHS, and you may <br />' call him at (209) 468-3454 should you have any questions or you wish to discuss the <br /> site <br />' Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Z-1 <br />' Michael J Infuma Jr , enior REHS Margaret F_agono, REHS <br /> LOP 1 Site Mitigation Unit 1V Supervisor <br /> Ml/ <br /> c CVRWQCB - Pat Anderson <br /> c SWRCB-CUF - J DiGiorgio, PO Box 944212, Sacto , 94244-2120 <br /> c Horizon Envir- G Barker, 5011 Foothill Pkwy, #7, EI Dorado Hills, 95762 <br />