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Ms Lori Duncan Project No 8 80-03 9 1 <br /> June 18, 2003 <br /> Page 11 <br />' continue to decline The addition of air sparging at the site will prolong the SVE system <br /> effectiveness and efficiency, and significantly reduce the time necessary for remediation <br />' of the remaining dissolved hydrocarbons in order to obtain site closure <br /> RECOMMENDATIONS <br /> Based on the results of this investigation, Shaw recommends that the newly installed <br /> wells be added to the existing monitoring and sampling program at the site These wells <br /> should be monitored for at least four quarters to confirm the results of this investigation, <br /> and to further evaluate groundwater flow and concentration trends before determining if <br /> additional assessment is necessary <br /> Based on the results of the feasibility testing, Shaw makes the following <br />' recommendations <br /> o Wells VW-1D, VW-2D, and VW-31) should be converted to air sparge wells <br /> o SVE should continue from wells VW-1S, VW-2S, and VW-3S, and SVE <br /> ' operations should be changed from the existing pulsing schedule to full time <br /> Because the existing deep vapor extraction wells will be converted to air sparge wells, <br /> quarterly groundwater sampling from the wells will not be possible, but the addition of <br /> newly installed wells MW-4RS and MW-4RD will compensate for the changes <br /> If you have any questions regarding this work or require additional information, please <br /> contact David Herzog at (916) 565-4377 <br /> Sincerely, �f'D Ge 0. <br /> 1 � <br /> SHAW ENVIRONMENTAL, INC 0 <br /> X0.72999 � <br /> Benjamin Chevlen David W Herzo R 7211 <br /> Staff Geologist Project Manager q� OF `,F� <br /> 1\SACRFPIICOMMON`sacDP120031Prti88018800391A 3ae doc <br />