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04/25/2091 17: 19 19493668090 REGENESIS PAGE 04/13 April 25,2001 Page 3 of S • Estimated groundwater velocity: up to 200 feet/year. Note that groundwater velocity controls the extent to which,new contaminant is brought into the treatment zone. This contamin= loading must be considered when specifying HRC dosing requirements. • Current groundwater geochemistry: Assumed to be generally aerobic with oxygen <3 mglL, nitrate <300 mg/L, ferrous iron <10 mg/L. The oxidation-reduction potential is unknown at this time. The design specifications and costs provided below represent a preliminary design for an accelerated bioremediation project. This design may need to be adjusted as detailed design and regulatory oversight issues are finalized. For instance, the following design variables may need to bead jus prior to the implementation: • Treatment areas may need to be increased or decreased depending on the overall site remediation strategy. • Exact delivery iocations should be selected in the final design process. Delivery locations may need to be adjusted to take into account site features such as underground utilities and other site structures. Re-enesis' Applications engineering staff is available to assist in the selection of an appropriate final design. Total Project Cost The total cost of an accelerated bioremediation project can be estimated as the sum of the following items: • HRC compound material and shipping costs. • HRC application fieldwork costs. Customers are responsible for selecting a local injectionlapplication subcontractor. • Groundwater monitoring well construction (if necessary to monitor project performance). • Periodic groundwater sampling and analysis. • ConsuItant oversight and reporting. Regenesis data evaluation and technical support are provided free of charge. The costs provided in this letter apply to HRC material costs for one application. The need for re- applications will depend on your plume management strategy, site-specific biodegradation performance, remedial goals for the site, and other technical or regulatory considerations. For plume area treatments, one to two re-applications could be necessary over the course of the project, although each re-application would most likely be done over a reduced area and dose amount compared to the initial application. For barrier-based designs, re-applications will be necessary every one to two years as long as there is a need to prevent contaminant migration. 1:\14PC\Propo5als\GeoSyntec\VcrnalisNitrate Sice\Vemalis Not Test 4-24-0 1.dcc