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Additional Site Assessment and Second Quarter 1990 Monitonng and Sampling Report 9 <br /> \ 7-Eleven Inc Store#19976 1399 N Main St Manteca California July 15,1999 <br /> The very low benzene to TPH-G ratio,together with low to nondetectable MTBE concentrations, Indicate <br />' that the dissolved hydrocarbon plume is old and being naturally biodegraded over time <br /> It is IT Corporation's opinion that further site assessment is not warranted Completion of additional <br /> 1 downgradient soilbonngs and monitoring wells would have to be done at an off-site location, either in the <br /> street(Northgate Drive) or across the street at the Nissan Auto Dealership It is likely to be difficult to get <br /> approval to drill in either of those locations due to the unwillingness of the City of Manteca to let us drill in <br /> the street and property owner liability issues involved in drilling at the Nissan Auto Dealership <br /> The decreasing and low dissolved oxygen levels in groundwater beneath the site indicate depletion of <br /> oxygen due to intrinsic biodegradation IT Corporations proposes possible cleanup through natural <br /> ' attenuation/enhanced bioremediation processes No further remediation and/or assessment work will be <br /> done until the SJCPHS responds to this report <br /> 1 <br /> 1 <br /> 1 <br /> 1997882 sir <br />