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Both of these conditions result in decreased vapor <br /> concentration, and hence decreased removal rates with time . <br /> As SVE continues and contaminant levels decrease, it <br /> becomes more difficult to remove the residual contamination <br /> through SVE , however, in-situ biodegradation (bioventing) <br /> of these less volatile components is expected to occur and <br /> will be facilitated by the injection of nutrients and air , <br /> as deemed appropriate. EPM is aware, that while practical <br /> limitations may exist which limit the ability to remove all <br /> of the contamination, the system proposed should reduce the <br /> level of contamination by at least 90% . <br /> Confirmation of the success of the remediation program will <br /> be through the acquisition and certified analyses of soil <br /> and groundwater samples obtain in accordance with PHS/EHD, <br /> RWQCB, and SJVUAPCD requirements . <br /> All work will be performed under the direction of a <br /> California Registered Civil Engineer in accordance with <br /> procedures set forth in an approved health and safety plan. <br /> Should you desire additional information, or if we may <br /> otherwise be of assistance, please contact either of the <br /> undersigned at ( 209) 538--3768 . <br /> Sincerely, <br /> John E. Rapp , REHS <br /> Project Microbiologist <br /> Jzdemir Beyce , Ph. D . <br /> Certified Professional ,Soil Scientist <br /> f ��' a��► ki9 �y <br /> Marvin Kirkeby, P . E,-. q, 'fes <br /> Registered Civil Engineer No.14M is 2 <br /> JER/OB/MK:ms Imp 0 t <br /> enc. %P <br /> cc: Mr. Gerald Sperry , Attoney at Law SRT 01VO. CQr <br /> OF CAV�t <br /> Page 12 <br />