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TABLE 5 DETAILED ANALYSIS OF REMEDIAL ALTERNATIVES Former Countryside Market-10848 Copperopolis Road Stockton,California Alternative 1 Alternative 2 Alternative 3 Alternative 4 Criteria Enhanced Bioremediation Chemical Oxidation Biosoargina Air Sgaraina Comment Score Comment Scare Comment Scare Comment Score Overall Protection of Good to moderate-Potential for Good to moderate-Potential for Good-Does not result In potential for Good-Does not result in potential for unintended impacts to groundwater unintended impacts to groundwater Human Health and quality(depending on substrate injected) 6 quality(depending on oxidant injected) secondary MCL issuesexceir. rices or other 70 secondary MCL ssuexceetlances or other 10 Environment must be carefully evaluated. must be carefully evaluated domestic water issues. domestic water issues. Good to moderate-Will work towards Moderate-Will work towards MCLS in Compliance with MCLS throughout plume,and can be 6 source area but not feasible for 6 Good- Will work towards MCLS 9 Gootl- Will work towards MCLS 10 MCLS combined concurrent or in sequence with downgradient/low concentration portion throughout plume. throughout plume. other alternatives as polishing step. of plume. Moderate-At least a few Injection events Good-Provided adequate number of Long-Term Moderate-At least a few injection-rel events Good-Providedpoints are adequate number rof a would be required. Controlled-release sparge points are installed and operated ERectivenen and 6 would be required. Controlled-release 5 9 sparge points are installed and operated 9 substrates that can last up to b provide optimal oxygen levels for Permanence approximately 1 year available. oxidants available. biological growth. m stripNolatiliza and biodegrade plume. Moderate-Effectively destroys Good-Biodegradation processes for the Good processes for the Good to moderate-Multiple treatment Reduction of Toxicity, contaminants but potential for secondary Mobility,and Volume Plume constituents can generally be plume constituents can generallybe mechanisms that seoontlaneprovide sail 9 MCLeation etas among metals 5 9 8 through Treatment carried out through the Lull decomposition mobilization metals along with soil matrix carried out through the full decomposition treatment within a migration.zone. Potential g pathway. pathway. for inducing plume migration. desorption. Good to moderate-Readily available Good to moderate-Readily available Moderate-Overcoming matrix equipment that is easy to operate. equipment that is easy to operate. Moderate-Relatively deep for direct interaction effects and achieving direct Number of injection points best Number of injection points best Implementability injection but feasible and several 6 5 determined via testing. City right-of-way 7 determined via testing. City right-of-way 8 injection points would be required. oxidanbaormami ctive interaction ion can be permitting required for downgradient permitting required for downgradient difficulMimit effectiveness. portion of plume to install,trench and portion of plume to install,trench and tie-in additional wellslnjection points. tie-in additional wellsrnjection points. Moderate-Degradationterestypica Gootl-Canerallythe fastest among all Moderate-Generali slower relative to Good-Significant favorable results Time to Reach the alternatives when applied properly air sparging as a primary result of the typically achieved within 1-2 years of Remediation Goals accelerated 10 to 100 times faster than 5 and reinjected,as necessary,but not a 9 lower injection rales and single treatment 6 continuous operation. Reaching MCLS 6 natural attenuation processes. stand alone remedy for smile plume. mechanism. likely to require up to about 3 to 5 years. Moderate to high-Depending on Moderate-Relative to air sponging, Good to moderate-Particular) cost- Good to moderate-Depending re if Y Site geochemistry and if rebound longer term O&M vests,and higher Cost rebound eventstotal number of required 7 4 6 effective for Baal and O M costs. 7 injection events. naturalists]v number of required capital vests(i.e.,greater number of Moderate capital and O&M costs. injection events. wells required). Overall Ranking 49 41 56 60 Notes: Scoring System is as follows: 0=Ineffective/Not easily implementable/High cost 5=Moderately effective/Implementable/Moderate cost 10=Highly effective/Easily implementable/Low cost Page 1 of 1 The Source Group,Inc.