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Lincoln Center- Injection PilotOdy <br /> Pagc 2 of 3 <br /> From: Spill, Chris [mailto:Chris.Spill@lfr.com] <br /> Sent: Wednesday, February 21, 2007 11:43 AM <br /> To: Mike Infurna [EH] <br /> Subject: Lincoln Center-Injection Pilot Study <br /> Mike, <br /> LFR is in the process of evaluating the need for a pilot study to inject a degradable carbohydrate solution <br /> (such as molasses, cheese whey, or corn syrup) into the impacted saturated zones in the vicinity of the <br /> Bank of Stockton. Conceptually, the pilot study would require the installation of multiple injection points <br /> (spacing yet to be determined)along a line perpendicular to the chlorinated solvent plume. The injection <br /> points would consist of 2-inch diameter, PVC blank casing and wire-wrapped well screens (screen <br /> lengths yet to be determined).At present, we are anticipating 11 injection points per saturated zone <br /> (Upper A, Lower A and B zones)for a total of 33 injection points. <br /> The injection points,which are constructed similarly to monitoring wells (sand filter pack, bentonite seal, <br /> and grout seal), will be abandoned at some point in the future ideally by pressure grouting. After <br /> reviewing the "Standards for Well Construction & Destruction in San Joaquin County", the following <br /> questions came to mind: <br /> Is there a county requirement that limits the length of screen allowed if pressure grouting is to be <br /> used for abandonment? <br /> Is there a county requirement that would prohibit the installation of nested injection points of <br /> variable depths within the same borehole? <br /> Would county allow for injection points to be installed using a direct-push drilling method (which <br /> would not allow for an annular seal of a minimum of 2 inches in radial thickness)? <br /> The scope for this pilot test is still being developed and a work plan will eventually be provided to the <br /> California Regional Water Quality Control Board for approval; currently, we are only attempting to <br /> evaluate our options with respect to installation of the.injection points. <br /> Thanks for your guidance. <br /> Christopher G. Spill, P.G. <br /> Senior Geologist <br /> LFR Inc. <br /> 1900 Powell Street, 12th Floor <br /> Emeryville, CA 94608 <br /> 510.596.9539 Direct Dial <br /> 510.652.4500 Main Number <br /> 510.652.4906 Facsimile <br /> chris.spill@Ifr.com <br /> 2/22/2007 <br />