Laserfiche WebLink
Stallworth Auto Detail December 15, 2011 <br /> 602 California Street page 2 <br /> Also of consideration is control of the displacement of the groundwater that will occur as a <br /> result of the injection . Few of these factors were addressed or adequately discussed in the <br /> Study. <br /> Please proceed with submittal of a detailed Pilot Test Work Plan that addresses the <br /> following concerns: <br /> 1 . Is the ISCO remediation proposed to be hydrogen peroxide or Fenton 's Reagent? <br /> If it is strictly hydrogen peroxide, please explain the role/need of the muriatic acid . <br /> 2. If Fenton 's Reagent is to be used , please provide detailed information on the <br /> application rates and concentrations . The Guidance notes that the two reagents, <br /> hydrogen peroxide and iron catalyst must be injected separately, either <br /> sequentially or concurrently, so they may mix at the end of the well or borehole. <br /> 3 . Provide process and calculations used to determine the concentration and amount <br /> of the proposed reactants that will be needed for the pilot test. The stoichiometric <br /> demand of the contaminant mass targeted for treatment and the oxidant demand <br /> of the natural conditions must be factored in to this . Baseline iron content in the <br /> groundwater should also be taken into consideration to determine the dosing <br /> requirement. <br /> 4 . If Fenton's Reagent is to be used , note that the addition of acid is necessary to <br /> start the reaction only, and should not be administered through out the test. <br /> 5 . If acid is to be used , baseline alkalinity measurements must be taken to determine <br /> the amount of acid that would be necessary to reduce the pH level to the <br /> appropriate level to maintain solubility of the iron . Hydroxyl radicals may also be <br /> scavenged in the presence of highly alkaline water, so this needs to be known to <br /> determine the amount of reactants needed . <br /> 6 . Establish a field monitoring and sampling program that will adequately monitor the <br /> dispersion of the oxidant and the effectiveness of the treatment in three <br /> dimensions . A sufficient number of monitoring wells should be utilized , at differing <br /> distances from the injections points , to track dispersion of the oxidant and collect <br /> adequate monitoring data. <br /> The work plan is due for submittal to the EHD no later than February 10 , 2012. If you have <br /> any questions or comments please contact Lori Duncan at (209) 468-0337, or by email at <br /> Iduncan@sjcehd .com. <br /> Lori Duncan , REHS Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Jim Barton , CVRWQCB , 11020 Sun Center Drive #200 , Rancho Cordova CA 95670 <br /> Ally Colavita , AGE, 837 Shaw Road , Stockton CA 95212 <br />