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TABLEA SOIL AND GROUND WATER CORRECTIVE ACTION ALTERNATIVES Bob's Muffler Shop 466 Moffat Boulevard, Manteca, California Estimated Costs Typical Monitoring Estimated Method Advantages Disadvantages (incl. Monitoring and Maintenance) Requirements Duration Ground Water •Rapid reduction in high •High volumes of extracted water $30,000 to$50,000, Quarterly or monthly May vary; Extraction concentrations•Prevent spreading will require disposal•Typically set-up,plus treatment monitoring;analysis of typically 18 to of plume. difficult to achieve cleanup goals and disposal of water extracted water. 36 months. Section 7.1. Usually not cost effective for larger plumes-Equipment can be costly. In-situ Air Sparging •Cleanup technique compatible •Initial equipment/design costs can $15,000 to$25,000 Monthly ground water 18 to 24 months with site conditions-Combines be costly•capitol Impacted ground plus extraction depth measurements;. Section 7.2. well with SVE•Readily available water extends off-site, monitoring,depending monthly sample equipment•Site,conditions are upon treatment period. collection. conducive for IAS treatment•Little equipment maintenance required. I _ i In-situ •Relatively simple design and •Usually no immediate reduction in $70,000 to Monthly ground water I2 to 18 months Bioremediati6n application process•Little or no hydrocarbon concentrations• $95,000 total cost and vapor sampling; (Ground Water) maintenance required. Remediation controls difficult to quarterly monitoring; implement-Regulatory acceptance microbiological analysis . Section 7.3. difficult to obtain,-Waste discharge of samples. permits sometimes required. Natural Attenuation -.Lower costs than most active •Not effective for higher $6,000 to$20,000 Quarterly ground water Unknown remedial alternatives•Minimal contaminant concentrations• annually monitoring , Section 7.4. disturbance to the site•Potential Migration of contamination may use below structures. occur•Longer time frame than active remediation�May not achieve cleanup levels within reasonable length of time•Not generally permitted when free product is resent. Advanced GeoEnviron mental,Inc.