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• Page 1 of 5 <br /> Nuel Henderson [EH] <br /> From: Ami Adini [amia@amiadini.com] <br /> Sent: Wednesday, February 13, 2013 10:30 PM <br /> To: Nuel Henderson [EH] <br /> Cc: Daren Zumberge; 'Gus osterkamp'; Elie Balas; Paul Zumberge <br /> Subject: 425 Larch Road in Tracy, CA-- Remedial Technologies and Case Closure <br /> Attachments: Pages from 01_FrontierTransport_po1_IRAI_Full Report.pdf <br /> Dear Nuel, <br /> With reference to your question below, here's a broadened answer. <br /> There are three remedial options that can be applied to remediation: <br /> . A second, 30-day dual phase extraction event; <br /> . Excavation <br /> . SME (Subsurface Metabolic Enhancement) <br /> To put them all on the same platform, we define the area of treatment on the enclosed <br /> diagram. This is the core of the plume formerly addressed by the DPE event. it measures <br /> (approx.) 42'X24' = 1008 sq.ft. <br /> Groundwater is currently at (approx.) 10 feet below ground surface (bgs). Maximum <br /> historical depth has been recorded at 12 feet bgs. <br /> On the excavation option, we plan on 5 to 8 feet below the historical lowest water table; <br /> that is 17-20 feet below grade. This will require shoring on all sides. <br /> Option 1: DPE <br /> . eration, maintenance, sampling, fuel, power, <br /> Scope: One 30-day event including op <br /> disposal of all extracted water, and report. <br /> . Estimated Cost: $115,000 <br /> . Time: 2 weeks to mobilize, 5 weeks to perform and 4 weeks for the report: total of <br /> 10 weeks <br /> Option 2: Excavation <br /> . Scope: Formulate a workplan and get it approved by the County. Design, permit, <br /> shore, excavate, pump out water from the excavation, treat the excavation with <br /> oxygen release compounds, haul and dispose of the excavated soil in a permitted <br /> treatment facility, perform confirmation sampling, purchase and import backfill <br /> material, backfill and compact to grade, and compile a remedial action report. <br /> . Estimated Cost: $350,000 to $500,000 <br /> . Time: 4 weeks for the workplan, 8 weeks for regulatory approval, 6 weeks for the <br /> design, 12 weeks for permitting, 2 weeks for mobilization, 4 weeks for field work, <br /> and 4 weeks for the report: total of 40 weeks <br /> . Note: The design must be completed and permits secured prior to narrowing down <br /> the range of estimated cost. If on-site land-farming option is available, it will reduce <br /> the cost. <br /> Option 3: SME <br /> . d get it approved by the County. Design, permit, <br /> Scope: Formulate a workplan an <br /> procure the equipment, install all equipment, wells and trenches, operate, maintain <br /> and sample, perform confirmation sampling and compile the remedial action report. <br /> 2/14/2013 <br />