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CVATC A S S O C I A T E S I N C . During the test, ATC will measure and tabulate the flow rate, the thickness of free product, and drawdown in well MW-4 at intervals of 15 minutes or less. The depth to water in observation wells will be measured every 30 minutes for the first 4 hours and every 60 minutes thereafter. N Groundwater will be extracted for an estimated total of 24 hours. Upon completion of the pumping test, the pump and discharge hose will be removed from well MW-4, any free product present in the well will be removed from the well by hand bailing method, and the passive skimmer will be reinstalled. Planning and Permits ATC has prepared a health and safety plan and the necessary permit application and fees for the soil borings. The permit application and associated fees (check no. 244) are attached to this workplan. ATC will also schedule field personnel and equipment and contact USA at least 72 hours prior to advancing the soil borings to allow time for utility companies to identify any underground lines, pipes, or cables that may be affected by groundwater investigation activities. Soil Boring Advancement and Sample Analysis The three soil borings will be placed radially outward from well MW-4 at the locations shown on Figure 2. The soil borings will be advanced employing direct push technology (DPT) utilizing a truck mounted Geoprobe® soil probing unit to depths of approximately 15 feet below ground surface (bgs). Drilling will be conducted by a State licensed (C57) drilling company. A field geologist will be present to log soil samples. Descriptions of soil types encountered and sample collection intervals will be recorded on boring logs. Soil samples will be collected at five-foot intervals or at the soil/water interface. Each soil sample will be field screened with a Photoionization Detection (PID) meter or similar instrument and one soil sample from each boring, based on field observations (i.e. odor, discoloration, PID readings), will be placed in a cooler with ice and submitted for laboratory analysis. Following sample collection, the borings will be backfilled with cement grout to the surface. The selected soil samples will be immediately placed in a cooler with ice and delivered under chain-of-custody documentation to a State-certified analytical laboratory. Samples will be analyzed for total petroleum hydrocarbons as diesel (TPHd) by EPA Method 8015 modified. Mass Balance Calculations ✓ The results of the free product measured in well MW-4, analytical results, and historical information will be used to perform mass balance calculations (volume estimation) of the free product plume at the site. In brief, the scope of work will include reviewing historical release data, calculating the volume of free product removed, contouring soil analytical data, estimating the lateral extent of free product, and calculating the mass of contamination. w:\62574\62574.02\reports\pumpwkp.doc 3