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TABLE 4 INITIAL SCREENING OF REMEDIAL TECHNOLOGIES Former Countryside Market-10848 Copperopolis Road Stockton,California General Remedial Technology Satisfy Remedial Feasibility/Implementability Effectiveness Estimated Cost Retain or Reject Response Action Objectives No Action No Action No Good None None Reject Deed restriction-retain Moderate-Cannot implement Poor-Active source area groundwater Reject(may be used in No remediation is necessary and does not Low conjunction or in sequence land as vacant property directly. Institutional address imminent risk to domestic wells. with other technologies) Controls Access Restriction- Poor-Active source area groundwater Reject(may be used in fencing,physical barriers N0 Good-Obtain deeds,limit accessibility. remediation is necessary and does not Low conjunction or in sequence to address imminent risk to domestic wells. with other technologies) Moderate-Would require Likely good but feasibility data Moderate capital cost, i Biosparging Yes numerous sparge points and recommended to confirm biodegradability generally longer-term O&M Retain trenching in City right-of-way. and determine radius of influence, relative to air sparging. No(does not work in Moderate-Vadose zone Moderate to good for source area and/or Low to moderate costs Retain(pending collection Bioventing saturated zone but may be smear zone if used in conjunction with for passive and active of data to determine if soil effective with sparging) soils are relatively impermeable. bios ar in bioventin respectively. remediation required) P 9 9� 9. 4 ) Good to moderate-Would require Good-Testing recommended Moderate capital and Air Sparging Yes several sparge points and possibly to determine radius of influence/ O&M costs. Retain trenching in City right-of-way. confirm effectiveness. Bioslurping No Poor-Best for free product removal. Good for free product. Low Reject Moderate-Would require injection Moderate to high costs, Good for high concentrations but generally Retain(may be used In Chemical Oxidation Yes permit,numerous injection points, moderate for low concentrations.Collection depending on geochemistry conjunction or in sequence g multiple injection events.Matrix of eochemistry data recommended. and if rebound occurs/total with other technologies) In Situ oxidant demand currently unknown. number of injection events. Enhanced good but feasibility data Moderate-Would require injection Likely gModerate depending Retain(may be used in • Yes permit,numerous injection points recommended to help confirm full on if rebound occurs/total conjunction or in sequence Bioremediation d likaly_multiple_injection.evEnts_ decomposition pathway for all umber oUnjectinn events._ -wiftDU er_teGllnoIogfes) -chemicals can be achtev . In-Well Air Stripping Yes Good to moderate Generally poor.Efficiency severely Moderate to high capital Reject decreased when groundwater flow is high. costs,enduring O&M. No(imminent risk to Relatively low overall costs Reject(may be used Natural Attenuation domestic water supply Good Good when imminent risk to domestic but prolonged monitoring following source/ must not be present but water supply wells is absent. costs,low capital. plume remediation) viable when risk is gone) Poor-Extraction of flushed High capital cost for Soil Flushing Yes(must collect flushed solution would be involved to Good-Provided complete retention injection and capture Reject solution) implement and achieve. of sorbed mass in flush-water. system,enduring O&M. No(does not work in Moderate to high capital and Retain(pending collection Moderate-Vadose zone Moderate to good for source area if used in Soil Vapor Extraction saturated zone but maybe soils are relatively impermeable. conjunction with air sparging. O&M costs,depending. of data di determine a soil effective with sparging) vacuum requirements. remediation required) Page 1 of 1 The Source Group,Inc.