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O1 July 2002 AGE-NC Project No. 95-0106 Page 4 of 4 ,. the north, however, the general lack of rdetection of hydrocarbons in the-MW-7, MW-6, L. MW-5 and MW-3 wells shows that the plume is not'wide-spread and has not migrated northeast of MW-4 or northwest of the former UST pit. • The extent ofthe plume around MW-4 is constrained by data from MW-6 toward the north- northeast, MW-5 toward the southwest.and MW-7 toward the east relative to MW-4..The northwestern.extent of the plume from MW-4 is not well constrained. .,The results of this and previous monitoring events and previous soil investigations leads AGE to conclude that: The hydrocarbons encountered-in ground water samples from MW'l and MW-4 represent. - a northward extension of the hydrocarbon-impacted ground water that had already reached its current extent at the time-the monitoring well system was installed beginning in 1996. 5.0. RECOMMENDATIONS ' • n this and previous site investigations,AGE recommends.continued quarterly montoring of , Based o p g q Y the monitoring well network; the next monitoring-event should be scheduled for August 2002. An AGE-prepared Revised Work Plan far Soil and Ground Water Investigation -Addendum,dated 04 January 200% has been approved by the EHD by letter dated 23 April 2002. The scope of work includes advancing several soil borings to define the lateral extent of hydrocarbon-impacted ground ; water and establish a vertical sequence of soil lithology to delineate potential'permeable pathways. Upon pre-approval of costs from the California State Underground Storage Tank Clean-up Fund, AGE will schedule the'approvedwork with the EHD. 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by. ' environmental consultants practicing in this or similar localities. The findings were based'upon analytical results provided by an independent laboratory. Evaluations 'of the hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number, of available data points (i.e. monitoring wells,and ground water samples) and subsurface conditions. may vary away from' these data points. No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations.contamed in this report. ' Advanced GeoEnvironmentai,Inc.