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U A S S O C I A T E S I N C is the path of the school buses, well MW5 will be monitored manually with a depth to water probe. A 2-inch Redi-Flog, submersible pump equipped with a flow meter capable of reading flows up to 10 gallons per minute (gpm) and a discharge hose will be installed in well MW2. ATC will use a generator to supply power to the pump. Additional information on the submersible pump is provided in Attachment 1. ATC will perform a three-step drawdown test to determine the optimal flow rate for the 24-hour pumping test. Based on these results,groundwater will be extracted from the well at a constant rate, estimated at 5 to 8 gpm, for a period of 24-hours and discharged directly to the City of Ripon sewer system under permit from the City of Ripon Public Works Department. If the well goes dry during the long-term pumping test, the pumping test will be temporarily halted to allow groundwater to sufficiently recover and the test will be restarted. The pump, discharge hose, and transducers will be removed from well MW2 and the observation wells upon completion of the pumping test. ATC has received verbal approval from Mr. Dale Ramey of the City of Ripon to discharge groundwater to the city sewer system. Once ATC has received approval from PHS/EHD for this workplan, ATC will complete a permit application for the discharge of the groundwater to .the City of Ripon sewer system. A copy of the approved permit will be submitted to PHS/EHD. Summary Report Preparation ATC will prepare a final summary report for the site. This report will summarize all site activities, analytical results, pump test results, drawdown analysis, transmissivity, storativity, and contain an evaluation of the feasibility of this remedial option and recommendations. A copy of the report will be submitted to PHS/EHD. All work described in this workplan will be performed under the direction of a California _ Registered Professional Engineer. All work will be performed in accordance with ATC's Site Safety Plan (SSP) and Quality Control/Quality Assurance Plan, which are already on file with PHS/EHD for this site. PROJECTED SCHEDULE Once approval of this workplan has been received, ATC will schedule the pumping test. ATC will notify PHS/EHD.at least 48 hours prior to beginning any field activities. The summary report will be submitted to PHS/EHD approximately four to five weeks after the completion of field activities. w:1130991reportslpumpwkp.doc 3