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SOIL VAPOR EXTRACTION PILOT STUDY REPORT San Joaquin Counry Montgomery Ward Auto Service Center Public Health Services Department 5400 Pacific Avenue, Stockton, CA Site Code 2163 ' In considering excavation and disposal of these soils, we considered several factors These factors and their evaluation are described below ' Probability of achieving cleanup level The probability of achieving cleanup using excavation is very high due to the fact that it is possible to physically locate all impacted soils and remove ' those as needed This is the biggest advantage of this method Ease of performing excavation operations Due to the location of the impacted soil next to the Ward Auto Service Building, it appears that excavations down to depth of 40 feet may compromise the structural integrity of the building, particularly due to the fact that some of the contamination is very close to the building (near SP-lA and SP-113) Therefore, it would actually be very difficult to perform excavation operations Availability of space for temporary storage of the soil Due to the location of the impacted soil adjacent to a parking lot of a busy mall, it would be difficult to find space for temporary storage of over 9000 cyds of impacted soil Further, unless some additional steps were taken to guard against it, the soils would be a threat as potential exposure to general public Therefore, it appears that it is not feasible to store impacted soils above ground at this site I Disruption to operations Due to the nature of the method involving significant on--site construction activities, excavation would probably cause mayor disruption in the day-to-day operation of Ward business and could potentially cause the Ward business to be shut down for a period of up to two weeks This is most undesirable from Ward's perspective Cost of Im lementation The cost of implementation is a mayor factor in considering any remedial option Assuming 9,000 cyds of soil and approximately $80/yard for transportation and disposal of these soils, it would cost approximately $720,000 However, this cost may not be complete in that there may be additional costs for shoring, management of project, costs for additional quantities of soil not currently known, and additional fees as Waste Generator and IDisposal fees Therefore, the cost also appears to be a drawback Based on the above, EAI concludes that excavation and off-site disposal is not a feasible option for the Ward property at Stockton 9.2 Soil Vapor Extraction I The above factors were also evaluated for the option of soil vapor extraction as discussed below I Probability of achieving cleanuj2 From the results of the pilot test, it appears that the VES method will work effectively Therefore, the probability of achieving cleanup iS very high Ease of performing operations The majority of the VES has already been installed at the site I with very little disruption or problems to Ward or the general public From the results of the pilot test, it appears that the remediation can begin without further invasive, construction type of work The only task left would be install a permanent remediation system and connect the wells to this unit Therefore, ease of installation and operation for this method is very favorable IProject No 1232 - 16 - ENVIRONMENTAL AUDIT, INC