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Corrective Action Plan Montgomery Ward Auto Service Center, Stockton, CA ' ■ Ease of Implementation A significant part of the soil SVES (the wells and the probes) has already been installed at the site with very little disruption or problems to Montgomery Ward ' operations or the general public From the results of the pilot test, it appears that the remediation can begin using the wells and probes already present at the Montgomery Ward Site Also, installing the piping necessary to connect the wells and probes to the treatment equipment will not significantly impact on-site operations Thus, ease of installation and operation for this method is very favorable Therefore, a grade of 9 was assigned to this criteria for this remedial alternative ■ Availabilitypace ' The only aboveground space required for this method is an area (approximately 15 feet by 15 feet) to locate the vapor extraction system unit All other appurtenances are below ground Therefore, space is not a problem and is an advantage to this ' method Therefore, a maximum grade of 10 was assigned to this criteria for this remedial alternative ■ Disruption to Facility Operations As stated earlier, implementation of soil vapor extraction is not expected to pose any significant disruption to operations The only additional construction type work left, i e , installing the piping necessary to connect the wells and probes to the treatment equipment will not significantly impact on-site operations Therefore, this method would be the least disruptive to the day-to-day operations for the Montgomery Ward facility Therefore, a grade of 8 was assigned to this criteria for this remedial alternative ■ Time of Completion It is difficult to estimate the exact time needed for achieving soil cleanup goals using vapor extraction However, a reasonable estimate can be made from past experiences Considering the initial concentrations of vapors, the type of soil horizons, an estimate for the time of completion is about 2 years This is obviously a much longer time period than estimated for excavation and off-site disposal Therefore, a grade of only 3 was assigned to this criteria for this remedial Ialternative ■ Cost of Implementation Table 15 provides details on the estimated costs ($319 070) associated with completing this alternative These costs are significantly lower than those associated with excavation and off-site disposal A grade of 5 was assigned to this ' criteria for this remedial alternative ■ rl tA{ licabdiy 4V UlMIAau KANIWdiaio n Vapor extraction can be easily combined with ground water remediation by air- sparging In fact, vapor extraction is a necessary part of ground water remediation Project No 1232 - 15 - ISAB WORD I232CAP