Laserfiche WebLink
' Feasibility Study Report <br /> • 1140 W Hammer Lane, Stockton, CA <br /> Criterion 3 Long term efFectiveness <br />' The long term effectiveness of this alternative is ultimately good This alternative would reduce the <br />' toxicity and volume of the contaminants in the soil by enhanced natural attenuation The rate of <br /> reduction is not known, although the rate of reduction can reasonably be expected to be faster than <br />' natural attenuation without enhancement <br /> Criterion 4 Reduction of toxiciM mobility, or volume through treatment <br /> This alternative would reduce the existing levels and volume of impacted groundwater over time by <br />' enhanced natural degradation The rate of reduction is not known, but is expected to be faster than <br /> natural attenuation without enhancement and has often equaled that of an active groundwater <br />' extraction system <br /> Criterion 5 Short-term effectiveness <br /> This alternative would not immediately remediate soil or groundwater to levels acceptable to <br /> lieregulatory agencies, but has been effective in accelerating the rate of natural attenuation <br /> Criterion 6 Implementability <br /> The enhanced natural attenuation approach is relatively easy to implement ORC can be introduced <br /> into existing morutoring wells using ORC socks or by advancing direct push borings through the <br /> vertical zone of contamination (approximately 35-50 feet) in a slurry mixture <br />' Criterion 7 Cost <br /> Relative to groundwater pump and treat alternatives, this alternative would entail nnunimal capital cost <br /> associated with ORC installation Additional costs would include continued groundwater <br /> morutoring/sampling and additional applications of ORC if necessary Additional measures may be <br /> required if subsurface contaminants migrate offsite or if regulatory agencies find this alternative <br /> I unacceptable The estimated cost to implement this alternative is expected to be between $30,000 <br /> and $70,000, not including groundwater monitonnglsampling costs <br /> Cntenon 8 State acceptance <br /> ORC has been utilized in approximately 1,000 sites in California and should meet state acceptance <br /> I <br /> G IDamk.ROGNDZr-\KNnWLJ S HAWREPORTMI ambilit)R,port do, <br /> 16 <br />