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District may also terminate the test earlier than planned if the performance of the <br />equipment has been satisfactorily demonstrated and continued testing would not <br />provide additional benefits. If the District recommends modifications to the Project <br />Work Plan, an addendum to the Project Work Plan will be prepared and submitted to <br />the District for review. <br />6.0 Task 6- Perform Water Quality Sampling and Compile Performance Monitoring <br />Information <br />6.1 Collect and analyze water quality samples from the various process streams to <br />determine membrane performance and the potential for mineral scaling. Samples will <br />be analyzed for the common dissolved ions in groundwater along with silica, nitrates, <br />iron, manganese and some trace elements. Sample laboratory analyses will include <br />up to 130 general mineral content tests and 40 radionuclide tests plus two <br />radionuclide tests on the composite dry solids produced by the spray dryer. In <br />addition, laboratory analyses will include initial water quality screening tests by the <br />VSEP supplier and three membrane autopsies. The District's field engineer will also <br />measure conductively, pH, and turbidity or SDI as part of the field engineer's daily <br />field checks. This information will also provide the Consultant with "real time" pilot <br />plant information. The water quality data will be compiled in spreadsheet format for <br />trend analysis. <br />6.2 Since the concentrated brine streams from the ZLD pilot plants will be <br />recombined with the permeate from the ZLD pilot plants, the water quality <br />discharged from the ZLD pilot test equipment will be similar to the concentrate from <br />the Town's Membrane Water Treatment Plant which is currently being discharged to <br />the Town's wastewater treatment plant. As a result, the ZLD pilot plant will be <br />discharged to the Town's sanitary sewer and it will not be necessary to provide <br />additional samples for discharge permit compliance monitoring. No toxicity testing <br />of the residual streams is proposed since the intent is not to discharge the residual <br />liquid in any surface water. The ZLD pilot plant water is also not being used for <br />potable water, therefore sampling for compliance with Colorado Department of <br />Public Health and Environment (CDPHE) regulations will not be required. <br />6.3 Provide electronic copies of water quality spreadsheet to CWCB monthly. <br />7.0 Task 7- Prepare Pilot Plant Evaluation Report, Decommission Pilot Plant Equipment <br />7.1 Upon completion of the pilot testing scenarios, decommission each pilot plant and <br />remove from the Town's Membrane Water Treatment Plant site. Arrange for leased <br />equipment and trailers to be returned to venders. Coordinate decommissioning <br />activities with the Town. <br />ECCV ScopeOtWork.doc <br />