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Mr Darin L Rouse <br /> ExxonMobil Corporation <br /> February 22, 2000 <br /> Page 2 <br /> Discussion and Recommendations <br /> ' In June 1999 monitoring wells MW-9 and MW-10 were installed adjacent to monitoring wells MW-2 <br /> and MW-3 Since approximately November 1995, the water table elevation was above the tops of the <br /> screens in MW-2 and MW-3 The purpose of MW-9 and MW-10 was to provide wells screened across <br /> ' the water table Two quarters of ground water quality data show that concentrations of analytes in <br /> MW-9 and MW-10 are consistent with concentrations obtained from MW-2 and MW-3 between 1995 <br /> and 1999 <br /> ' Based on ground water measurements collected since monitoring activities began at the site in <br /> August 1991, flow direction has been historically towards the northeast with some seasonal variances <br />' towards the east The Southland property located west of the former Exxon service station has recently <br /> removed and replaced its underground storage tanks As a result of soil conditions encountered within <br /> the tank basin, Southland has initiated a soil and ground water contamination investigation <br />' Remarks/Signatures <br /> The interpretations contained in this report represent our professional opinions, and are based in part <br />' on information supplied by the client These opinions are based on currently available information and <br /> are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this <br /> time and location Other than this no warranty is implied or intended <br /> Future Work <br /> Che next ground water sampling is scheduled for E ebruary 2000 <br />' Delta recommends that a copy of this report be forwarded to <br />' Mr Mike Infurna Ms Elizabeth Thayer <br /> San Joaquin County Environmental Health California Regional Water Quality Control Board, <br /> Division, Public Health Services Central Valley Region <br />' Post Office Box 2009 3442 Routier Road, Suite A <br /> Stockton, California 95201 Sacramento, California 95827-3098 <br /> If you have any questions regarding this report, please contact Jim Brownell at(916)638-2765 <br /> Sincerely, <br />' DELTA ENVIRONMENTAL CONSULTANTS, INC <br /> r7 i ( 1 QYROFEs <br /> El aminn enin ur <br /> Staff Geologist 0057 <br /> 46 <br /> Cn <br /> St en eeks � V I1. P,F <br /> Project Manager �.ea.'r�o <br />' California Registered Civil Engineer No C057461 <br /> Enclosures <br />