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ase <br /> contaminated material is removed. <br /> monitoring/sampling of the Continued <br /> groundwater well mWl should be <br /> conducted to assess potential contamination from these soils <br /> or future leakage that may occur between the annual tank <br /> testing. <br /> 6.3 Alternative 3 <br /> :In situ r—lediation of soils <br /> Could be by <br /> installat: n of a soil venting system. This wouldMCCOmplished entail <br /> the compj_. ,iOn of shallow vapor extraction wells <br /> Id area of :jQ.;. <br /> I contamination Within the <br /> - A vacuum pump would be used to <br /> apply a negative pressure head to drive volatile hydrocarbon <br /> constituents to the vapor wells. These wells <br /> would be <br /> Plumbed to a carbon filter unit to adsorb the contaminants <br /> prior to being emitted to the atmosphere. <br /> Soil types are not as conducive Although silty <br /> tO ve-iting as sandy soils <br /> types, -the limited area Of contaminatiC.1 deems this a viable <br /> Option. Soil Samles suld be collected <br /> analysis duringpapor howell installation for laboratory <br /> vprovide <br /> additional background data. Confirmation sotil bo <br /> Samples will be required to (19tOrmine reductionsrining <br /> contaminant levels <br /> in soil. As with the two previous <br /> approaches, the on-site <br /> monitoring well Should be <br /> Conditions. t <br /> periodically sampl®d to assess groundwater quality <br /> In terms Of protection Of public health and water quality <br /> the alternatives are <br /> essentially equivalent since the <br /> contamination has been demonstrated to be Of limited extent <br /> and environmental mobility. <br /> For the excavation and <br /> treatment/diSposal <br /> (Alternative 2) <br /> greatest would provide the <br /> assurance that qroundwater quality would not L3 <br /> adversely affected. <br /> V4 <br /> 14 7.0 REFERENC2S <br /> 1-4 Tri Regional Guidelines Regional Board Staff Recommendations <br /> for Initial Evaluation and Investigation of Underground <br /> Tanks (Tri-Regional Recommendations) Revised May 18, 1989, <br /> Regional Wat,%r Quality Control Boards. <br /> San Joaquin <br /> Flood Control and Cons <br /> Annual Ground tervation District Semi- <br /> water Repor , Spring 1989 <br /> C , <br /> Flood Control and Water 6 San Joaquin County <br /> e. 6j Conservation District. <br /> 'A <br /> 7—: <br /> 6 <br /> P. <br />