Laserfiche WebLink
In this option, treated ground water would be discharged <br /> into local receiving waters via a storm drain under <br /> National Pollutant DischargeEli.mination SystemDsection) <br /> b local <br /> permit. The City of Tracy, Y <br /> w 5-6.204, does not currently allow continuous discharge, of <br /> treated ground water to the sanitary sewer (Sagaser, 1991) . <br /> Due to a relata.vely low pumping rate of less than 5 gallons <br /> (less than <br /> per minute, and low TPH-0/TPH-D concentrations <br /> 1 ppm) anticipated for this site, activated carbon adsorption <br /> was chosen as the preferred treatment method. Thenadvantages <br /> of this r7ption include: (1) proven highly <br /> efficand <br /> effective Technology; (2) minimal community and regulatory <br /> impact; and (3) cost effectiveness. No further detailed <br /> comparison of options is warranted at this time. <br /> Aquifer test(s) would be performed to determine aquifer <br /> characteristics at the site prior 'to design of thebeeselected <br /> system. Monitoring Well Atil•-3 or AW-1 wiZltest, <br /> kelthe most <br /> as the pumping well. An extended pumping <br /> technically desirable, may not be practical on t,'i•s site due <br /> to anticipated limited ls.e.'d^, and <br /> d discharge rates, we <br /> transient capture zones. A combination of a pumping step <br /> test in AW-3 and/or AW-1, and slug tests in several wells <br /> would be considered as an alternative. The results Of <br /> aquifer testing would be used to verify the applicability of <br /> this alternative. <br /> A summary of the projected costs for treatment of ground <br /> water by activated carbon adsorption is presented below. <br /> COST ESTIMATE OF ACTIVATED CARBON TREATMENT <br /> = <br /> ITEM <br /> Engineering design and permitting <br /> $ 1,500 <br /> System Purchase/Installation: <br /> wirin installation 10,500 <br /> oTrench/Piping/ g _ - <br /> pad, fencing., stem including concrete 18,000 <br /> o Installation oaY <br /> and costs <br /> Two 200-pound carbon units <br /> I,500 <br /> #f <br /> controls 2,000 <br /> c One electric submersible pump, <br /> a one totalizing <br /> flowmeter 1,500 <br /> i <br />