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=jW uft <br /> • Working to Restore Nature <br /> i <br /> WORK IN PROGRESS <br /> The final design of the air sparge and vapor extraction system and permitting is in progress. <br /> RFSNA is currently preparing the Problem Assessment Report. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Hydrocarbon concentrations continue to fluctuate in groundwater underlying the site The <br /> groundwater flow direction was flowing towards the east-southeast which is generally <br /> consistent with past data <br /> We understand that ARCO will continue quarterly monitoring We recommend that copies <br /> of this report be forwarded to Mr Michael Infurna of the San Joaquin Public Health <br /> Services, P.O Box 2009, Stockton, California 95201 and Ms Elizabeth Thayer of the <br /> California Regional Water Quality Control Board, Central Valley Region, 3443 Routier <br /> Road, Sacramento, California 95827-3098 <br /> 0415ccar/MM3-15 3 <br />