Laserfiche WebLink
Former Discovery Chevrolet .Tune 5, 1998 <br /> Tracy,California Corrective Action Plan <br /> /a <br /> paving of the backfilled area are estimated to be approximately $4,000. Two episodes of <br /> groundwater monitoring are estimated to be approximately $2,000. The preliminary total <br /> cost for this soil remediation alternative estimated to be approximately $25,000 to $31,000. <br /> 5.2.1.3 Groundwater Extraction from Excavation <br /> As a part of the soil excavation operations, it would be a relatively quick and prudent <br /> measure to extract a volume of groundwater from the excavation prior to backfilling in order <br /> to help minimize impact to the soil materials that would later be used for backfilling the <br /> excavation. During the excavation operations and prior to backfilling, the shallow <br /> groundwater will probably accumulate at the bottom of the excavation. The groundwater <br /> could be easily extracted with the use of a trash pump, and stored temporarily onsite in an <br /> aboveground storage tank (AST). Removal of hydrocarbons from the groundwater would <br /> most easily and quickly be performed by carbon absorption. After treatment, the <br /> groundwater may be discharged to the sanitary sewer system, depending on local discharge <br /> % .3 <br /> regulations. If the groundwater cannot be discharged to the sanitary sewer system, <br /> then the <br /> groundwater will be extracted by a vacuum truck for transport to a temporary storage and t� <br /> disposal (TSD) facility. <br /> Groundwater samples would be collected from the extracted "influent" groundwater prior to <br /> treatment by two carbon canisters, and from the "effluent" groundwater after treatment by <br /> the carbon canisters. After laboratory analysis, a determination would be made as to <br /> whether the groundwater may be discharged to th�'stopfl �r sanitary sewer system, or <br /> transported to a TSD facility for disposal: <br /> 0 <br /> Residual hydrocarbon-impacted groundwater would remain beneath the site after the <br /> r' completion of the excavation and groundwater treatment operations. Exposure risks to <br /> humans and the environment from the remaining residual hydrocarbon-impacted <br /> groundwater would likely be minimal. <br /> 3001-21.cap 13 HORIZON ENVIRONMENTAL INC. <br />