Laserfiche WebLink
i <br /> Woodward•Clywe COnStti,tat"s <br /> 7.0 PREFERRED REMEDIAL ALTERNATIVE <br /> The criteria for seiecting an alternative to remediate hydrocarbon contamination at the <br /> Callrans Shop 10 facility include the cost and time required to achieve required cleanup <br /> levels, the applicability of the selected technology, and the likelihood of regulatory <br /> approval. A ccsi comparison indicates that groundwater extraction with on-site air <br /> stnaping treatment and discharge to the sanitary sewer in combination with VES <br /> treatment of soils is slightly more cost effective that enhanced insitu biodegradation. <br /> Thls analysis assumes that Caltrans can obtain air and sanitary sewer discharge permits <br /> that allow low concentrations of volatile compounds (such as ethylbenzene) into the <br /> atmosphere and POTW. if either permit cannot be obtained, then reinfiltration of the <br /> treated water into the contaminated soils with the addition of nutrients to enhance <br /> biodegredation may be the only remaining alternative. This technology is less cost <br /> r- -„Live than either of the alternatives described and also requires permits from the <br /> local health agency and RWQCS to reinject the treated water. <br /> 7 <br /> i <br /> i <br /> i <br /> a <br /> , <br /> 32 <br />