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Jg <br /> lh §. <br /> Groundwater Remediation <br /> Groundwater remediation may involve monitoring contaminant levels <br /> or actively removing and treat4.ng the contaminated q::rundwater. <br /> Groundwater monitoring is often done if contaminant levels are low <br /> or localized. if increased contamination is observed, a more <br /> active remediation approach may then be required he contavelsof <br /> contamination are generally remediated by pumping the <br /> off- site. <br /> nated <br /> groundwater out of the ground and treating <br /> on- <br /> EVALUATION OF OPTIONS AND RECOMMENDATIONS <br /> calls for further investigation before remedial action <br /> Option #1 <br /> and Option #2 calls for remedial action without further <br /> investigation. Option #1 may not be necessary since areas of <br /> contamination, and the lateral extent of the contamination in some <br /> directions, is already established. The installation of borings <br /> and wells and the associated chemical analyses, are expensive. The <br /> additional data gained may not justify the time and expense. <br /> Option #2 may be the most appropriate option for this site <br /> considering time and economic factors. <br /> TECG recommends Option #2 because it will remove the sources of <br /> contaminationos trat gy efficient can andcost <br /> developedve based ner. An <br /> on the <br /> effective remediation <br /> existing data. <br /> PROPOSED REMEDIATION PLAN <br /> Soil Remediation <br /> Action Area Ma , ws th6 <br /> eted <br /> Figure 18, Proposed the dialeltas for future mon itor�ng wellsargTECC <br /> excavation areas <br /> recommends the following excavation plans for each area of known <br /> contamination at the Steve's Rental site. <br /> Northwestern Portion of propert <br /> d Excavation of petroleum hydrocarbon contaminated soils in <br /> the vicinity of . he <br /> previously removed waste oil tank. The <br /> lateral extent.o.f...the excavation should ,be:directed'by the <br /> USe Of 'field observations and hydrocarbon vapor screening <br /> devicae. Soils should be excavated to a depth of <br /> approximatthe two to roundwatr <br /> removal hof econtaminated soif eet below the ls belowetheable <br /> to ensure the ely <br /> groundwater level. <br /> PAGE 25 <br /> 275 GRANT LINE ROAD <br />