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I. N. KLEINFELDER &ASSOCIATES <br /> unit. This design also permits carbon replacement in the first unit <br /> 1 without system shutdown via by-pass plumbing. <br /> I <br /> TEQTLNIQ&L__FEA IBILI'1Y <br /> 1. Technical Reliability <br /> GAC treatment systems have been utilized successfully to reduce <br /> t.. <br /> ts. hydrocarbon contamination in ground water to the low parts per billion <br /> (ppb) range. Staged in-line GAC treatment units ensure high efficiency. <br /> Few hydrocarbon constituents are not effectively removed by this process. <br /> 1,4 2. Implementability <br /> Several vendors are capable of supplying GAC treatment systems. only <br /> i , minor design and construction is required for site-specific operation. No <br /> air emissions are created, thus this technique is widely accepted by <br /> f:r <br /> y regulatory agencies. <br /> r' ENVIRONMENTAL 5 KEENING <br /> f4 The only environmental disadvantage is related to effluent water quality. <br /> Some constituents have a low affinity to GAG and thus pass through the <br /> system. Verification monitoring of effluent will be required to assess <br /> Ufa system performance. <br /> P ; <br /> ` COST SCREENIN <br /> h•a <br /> Capital costs are high yet low O&M costs may offset the initial <br /> - b <br /> investment. o&M costs increase if highly contaminated influent water <br /> T3 necessitates more frequent carbon regeneration or replacement. <br /> 3.7 REMEDIAL ALTERNATIVE EVALUATION <br /> Potential remedial approaches to decontaminate the ground water have been <br /> identified above. These approaches are consistent -with--the-initia --- <br /> 33-87-887 17 <br /> 1 = <br /> !�s <br />