Laserfiche WebLink
Feasibility Study Report <br /> • 1140 W Hammer Lane, Stockton, CA <br /> explosion hazard would be trunirruzed with a properly designed system and regularly scheduled <br /> monitoring and maintenance <br /> Criterion 2 Compliance with ARARs <br /> Although considered an inefficient process, groundwater extraction and treatment has been commonly <br />' used over the past 15 years to reduce dissolved contaminant concentrations at contaminated sites and <br /> would generally meet ARARs <br />' Criterion 3 Long-term effectiveness <br /> The long term effectiveness of groundwater extraction is dependent upon the degree of removal of <br />' residual contamination The estimated timeframe to achieve cleanup is two to seven years This <br /> estimate is based upon the removal of 10 to 40 pore volumes of water from the area of impact at 15 <br /> gallons per minute Initial pumping test data is insufficient to determine if a pumping rate of 15 gpm is <br /> sustainable Based upon the presence of groundwater contamination within relatively fine-grained <br /> soils at the site, it is doubtful that all residual contamination could be removed through groundwater <br /> extraction Any residual contamination remaining after the system can no longer effectively <br /> remove contaminants would be reduced through natural bioremediation <br /> Criterion 4 Reduction of toxicity, mobilqy, or volume through treatment <br /> Groundwater extraction generally will reduce the level of toxicity, mobility and volume of <br />' contaminants in the soil by slowing or stopping the migration of groundwater in the contaminated <br /> zone Based upon the presence of groundwater contamination within relatively fine-grained soils at <br />' the site, it is not clear if contaminants would be reduced to levels acceptable to regulatory agencies <br /> Any residual contamination remaining after the system can no longer effectively remove <br />' contaminants would be reduced through natural bioremediation <br />' Criterion 5 Short-term effectiveness <br /> This alternative should result in demonstrably lower dissolved contaminant concentrations and act to <br /> Iretard plume migration fairly soon after the system is operating <br /> C,1Data1(iROLINDZCIKN0Wi.CS HAMIRTP()RTSNFea.9ihilityRLpaet dm <br />' 12 <br />