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04/25/2001 17:19 19493668090 REGENESIS PAGE 03/13 <br /> April 25,2001 Page 2 of S <br /> that the same reductive dechlorination mechanism will effectively degrade many of the pesticides <br /> present in groundwater underlying agricultural facilities. <br /> HI2£'is manufactured as a viscous gel that can be injected into the saturated zone in a grid or barrier <br /> configurations for either localized area or cutoff-based treatment approaches. The use of HRC for <br /> groundwater remediation offers a comparatively simple and cost effective remediation alternative <br /> for sites that would otherwise require unacceptably long periods of time for natural attenuation or <br /> the high levels of capital investment and operating expense associated with active remediation <br /> technologies. <br /> Pilot-Scale Field Testing <br /> A field-testing program can be initiated to confirm general project feasibility and design parameters <br /> prior to proceeding with a full-scale implementation. The most general field test consists of injecting <br /> HRC in a representative portion of the contaminant plume and monitoring groundwater quality in <br /> and downgradient of this pilot treatment zone over a 4- to 8-month period. To further our efforts <br /> Regifi <br /> enesis has conducted denitrcation bench scale testing. A copy of this bench test is attached. <br /> It is important that a reasonable groundwater-monitoring program be implemented to track the <br /> performance of the field test. Recommendations for groundwater monitoring are discussed in more <br /> detail below_ <br /> Design parameters and material cost for a field test are described below: <br /> Field Test Design feature Specification <br /> vertical extent of plume to treat 24 feet <br /> Number of delivery locations and configuration 23 locations in a grid configuration(3 rows of 5 <br /> points per row and 2 rows of 4 points per row) <br /> Application rate 6 lbs/vertical foot <br /> Material requirement and cost ($6.00/pound) (23 pts.) x (24'feet) x(= 6 lbs/ft) =3,330 Is <br /> $19,980 - $5,000 Regenesis Research Support <br /> yields a total of$14,980 not including shipping <br /> or sales tar <br /> Design/Proposal Assumptions <br /> Using the information you provided, we have made the following assumptions to estimate system <br /> design variables and dose amounts. <br /> Plume area requiring treatment: 30 x 30 feet <br /> Representative contaminant concentration: 60 - 90 mg/L nitrate <br /> Contaminated saturated zone thickness requiring treatment: 24 feet (24.5 to 48 feet bgs). <br /> 1:\RRC\Proposals\GcoSyntec\Vcmalis Nitrate SiteWcmalis Pilot Test 4-2"I.doc <br />