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ti <br /> OPTION METHOD ADVANTAGES DISADVANTAGE ESTIMATED <br /> S COST <br /> 1 Excavation Removes the Cost, logistics, $335,000, <br /> residual source utility rerouting, <br /> location, tenant <br /> relocation <br />++ 2 Dual Phase Removes both vapor Duration estimated 6 $209,000 <br /> t Extraction and groundwater, to 18 months, noise <br /> ! contaminants treated from equipment to <br />' with carbon n residents <br /> I 3 In-situ Degradation of Place in residual $133,000 <br /> Biodegradation contaminants by areas as mapped by <br /> microbes in-situ, borings, assumed <br /> minimal site effective in 6-I2 <br /> 1 disruption and months, additional <br /> impact to tenants monitoring <br /> Wright has prepared the cost summaries of the estimated costs for each option on the <br /> Previously referenced and appended estimates. These cost estimates include at least four <br /> y quarters of post cleanup groundwater monitoring. Approximately S 15,755.00 of each <br /> Options Cost is attributed to the Post Cleanup Groundwater Monitoring for (4) <br /> _ Additional Quarters, <br /> +E <br /> 1 <br /> 1 <br /> Limitations <br /> This report has been prepared specifically for Mr. Ed's Muffler, site at 595 West Eleventh <br /> Street in Tracy, CA and was done according to the State and local agency suggested <br /> guidance documents for these investigations. The interpretations, conclusions; and <br /> recommendations made herein are based on professional judgment of the data and analysis <br /> for the soil and water samples collected on-site and should be reviewed in the context of <br /> this report and other site reports. Wright Environmental Services, Inc. is not responsible <br /> for errors in laboratory analysis and reporting, or for information not available during the <br /> course of the study,and no warranty or guarantee is expressed or implied therein, <br /> a' <br /> k, <br /> i+ <br /> d , <br /> Page 17 <br /> x <br />