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E....u G Bnown Ja. <br /> aovonnor- <br /> , OCT 1 1 2012 MnnHew Rooalovcr <br /> Water Boards eLGNEiANV nn <br /> FNVIHnNMtN iRI Pnn'[F(:nn,. <br /> ENV , <br /> Central Valley Regional Water Quality Control Board RMtf/SERVICES Tf-r <br /> 10 October 2012 <br /> Estate of Barbara J. Hidaka Thomas 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 COUNTY(RB CASE#390546) <br /> I reviewed the revised Feasibility Study (Report) received 1 October 2012, submitted as an <br /> email attachment from your consultant Upgradient Environmental Consultants (UEC). The <br /> revised Report provides the requested detailed cost analyses for the following remediation <br /> technologies, and the rationale and figures to support the recommended technology. <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 and six months operation is <br /> estimated as $62,960; however, due to the sole source of the equipment, the cost for repairs <br /> could not be estimated. IWAS was not recommended, since there was a potential to exceed <br /> the costs of the remaining three technologies below if additional wells were installed to <br /> increase the radius of influence, and if the equipment malfunctions, since the <br /> manufacturer/vendor must do repairs. <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 cost estimates as <br /> $108,000 for ORC®; however, the remediation fieldwork could impact access for the <br /> business for up to two weeks. ORC®was not-recommended due to the high initial-cost and <br /> longer monitoring period requirement due to the slower-acting remediation process. <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 whether injection by borings, $27,750, or injection wells, $40,250. MN04 was <br /> favored over IWAS and ORC®; however, Mn04 injections were not recommended due to the <br /> short working life of Mn04, and the tight clay soils which might affect the radius of influence, <br /> requiring additional injections or wells with the subsequent increase in estimated cost. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E.. BCEE. EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95570 , www-waterboarCis.ca.govtcentralvalley <br /> ��ncCcicu rnrrn <br />