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Water Boards = <br /> Central Valley Regional Water Quality Control Board RECEIVED <br /> AUG 2 7 2012 <br /> 21 August 2012 <br /> ENVIRONMENTAL HEALTH <br /> Estate of Barbara .l. Hidaka PERMIT/SERVtCMmas O'Neill <br /> Cindy O'Neill, Executor Valley Motors <br /> 3465 Gleneagles Drive 800 East Main Street <br /> Stockton, CA 95219 Stockton, CA 95202 <br /> DOCUMENT REVIEW, VALLEY MOTORS, 800 EAST MAIN STREET, STOCKTON, <br /> SAN JOAQUIN C&UNTY`JRB CASE#-390546) - -- _ -- - <br /> I reviewed Feasibility Study (Report) received 2 August 2012, submitted as an email attachment <br /> from your consultant Upgradient Environmental Consultants (UEC). A 2009 groundwater pump <br /> test of monitoring well VM-2 showed increasing trichloroethene (TCE) and tetra chIoroethene <br /> (PCE) concentrations that were attributed to plume migration from an upgradient source. The <br /> following four remediation technologies were evaluated for cost, technical feasibility, and ability <br /> to remediate the petroleum hydrocarbon plume while preventing migration onsite from a <br /> suspected offsite TCE/PCE plume. <br /> • In-Well Air Striping (IWAS): Utilizes a small air striper that removes volatile compounds <br /> inside of a special treatment well. Vapor is removed and treated by Granulated Activated <br /> Carbon (GAC) or thermal oxidation (TO). Water entrained in vapor is returned to the aquifer <br /> without leaving the well. The Report cost for installation of the IWAS is estimated as <br /> $30,000; however, not included are the cost of vapor treatment by GAC or TO, the pumps, <br /> the compressors and utility. <br /> • Oxygen Releasing Compound (ORC®): In-situ injection (one event) by twenty nine (29) direct <br /> push borings spaced 7' apart of a 40% ORC° and a 60% water mixture (slurry). Slurry target <br /> depths are 35' to 55' below ground surface (bgs). The Report stated the three driller's cost <br /> estimates varied greatly but did not give a range of costs, just a maximum cost of $94,000 <br /> for drilling and the ORCO product. <br /> • Potassium Permanganate (Mn04).. In-situ injection (one event) of 3,000 gallons of a 2% to <br /> 3% Mn04 aqueous solution by six (6) injection wells spaced 15' to 25' apart. Solution target <br /> depths are 35' to 55' below ground surface (bgs). The Report stated costs varied, <br /> depending on injections radius of influence, from $25,000 to $40,000. <br /> • Pump and Ex-situ Treatment with Mn04 Injection (Recirculation P&T): Extracted groundwater <br /> from 4" diameter extraction well VM-9 would be treated by GAC and pumped into a holding <br /> tank, then an automated mixer would add Mn04 to create a 2% to 0.5% (Mn04 per cent <br /> mixture declining over time) aqueous solution in the GAC-treated water, to increase <br /> K.{-. E ScD. r.E., :.WIR , r-tALL4 C. CnE:EUC`.•J r.E.. ©C EE, E''.000TIVE C:_FCES <br /> C,,-jnvCcnl,my !'P)• <br />