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L" Additional 1,2-DCA Investigation a)%pjJell Survey <br /> �I <br /> Former American Forest Products Facility Table of Contents <br /> 6/13/2005 <br /> a <br /> URS Project No. 17322736 Page 4-2 <br /> 1Lr <br /> the surface and the groundwater will be transferred from the bailer into containers for delivery to the <br /> analytical laboratory. The direct push rods and bailer will be decontaminated between each sample. <br /> Sample analysis will be conducted using an onsite mobile laboratory provided by Transglobal <br /> Environmental Geochemistry (TEG) of Rancho Cordova, California. Groundwater samples will be <br /> transferred from the stainless steel bailer directly into the appropriate sample containers provided by the <br /> laboratory. All samples will be analyzed for volatile organic compounds(VOCs)by EPA Method 8260B. <br /> 1� <br /> x 4.4 BACKFILLING OF BORINGS <br /> The direct push borings will be backfilled by filling with a grout seal from the bottom of the borehole to <br /> the ground surface. The grout seal will consist of a mixture of Portland Type I or 1I cement, sand, and <br /> clean, potable water. A grout injection pump will be used to install the grout seal through a tremie pipe. <br /> The end of the tremie pipe will remain submerged in the grout mixture at all times during placement and <br /> the grout mixture will be installed in one continuous operation. The grouting procedure will consist of <br /> pushing a hollow cone penetrometer test (CPT) rod or small-diameter polyvinyl chloride. (PVC) casing <br /> 1.. with a knock-out plug back down the boring to the test boring depth. Grout will then be pumped under <br /> pressure as the tremie pipe is pulled from the boring. Grout inspection will be scheduled 24 hours in <br /> advance with Mr. Jeffrey Wong of the SJC-EHD(209-464-0138). <br /> 4.5 EQUIPMENT DECONTAMINATION <br /> All equipment that comes into contact with potentially contaminated soil or water will be decontaminated. <br /> Disposable equipment intended for one-time use will not be decontaminated, but will be packaged for <br /> appropriate disposal. Decontamination will occur prior to and after each use of a piece of equipment. All <br /> down-hole sampling devices used, including direct-push CPT rods, HydroPunch® samplers, and stainless <br /> steel bailers, will be steam-cleaned or decontaminated in accordance with EPA Region 9 reconunended <br /> procedures, as follows: <br /> 1. Non-phosphate detergent and tap water washing,using a brush if necessary; <br /> 2. Tap water rinse; <br /> �w <br /> 3. De-ionized or purified water rinse. <br /> Direct-push equipment will be decontaminated by the subcontractor. Decontamination water will be <br /> discharged to an onsite portable water tank. Due to the use of direct push, no other investigation-derived <br /> wastes are expected. <br /> 1.. <br /> 4 <br /> KAWprocess122736\American Foresi\Work Plan 20051Work Plan_2005_revol.doc <br />