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C.1 • Ob M solution shall be mechanically or hydraulically agitated in the well. The acid solution shall be inhibited to prevent unnecessary corrosion of the wells. A large amount of water or a buffer solution shall be present on site to mitigate the effects of a release of acid to the surface from the tivell. The spent acid shall be properly disposed of offsite or will be neutralized prior to discharge by the Contractor. Task 10.0 Airlift/ Development The Contractor shall perform airlift development in two stages. The first stage shall entail using the reverse air method to remove debris and bacteriological sludge from the well. This is done to provide that the debris does not migrate back into the formation, which could further degrade well performance. The second stage of airlift development shall be using the direct air method using an air compressor, Total time for development for both stages at each well is anticipated to be up to 24 hours. Task 11.0 Post Treatment Video Survey To document the physical results of the maintenance activities performed, the Contractor shall perform a color video survey after completion of the development activities. The survey will be recorded on VHS format videotape. Four copies of the survey videotape shall be provided to CDM w'.:hin five working days of completion of the survey. Task 12.0 Post Treatment Specific Capacity Test A three step specific capacity test shall be performed to quantify the improvement in well performance after the maintenance activities have been performed. The results from the test will be used for comparative purposes to determine if further mechanical and chemical treatments (Tasks 8.0 through 10.0 above) are required. The Contractor may supply the pump and motor, discharge piping, and flow measuring equipment on a temporary basis or may reinstall the well's production pump and appurtenances so that a specific capacity test may be performed at each well. Task 13.0 Installation of Production Pump The pump, motor, and well column pipe that is the original equipment for the well shall be installed and tested by the contractor. The Contractor shall provide and install an appropriately sized foot valve designed to prevent back washing of water into the well. After installation, the wellhead will be sealed to prevent contamination from surface water. Task 14.0 Final Well Disinfection The well and appurtenances shall be disinfected under American Water Works Association Chapter 0654 Section 5 guidelines. The County shall be responsible for collecting and analyzing the required bacteriological samples.. Task 15.0 regional Water level Data Evaluation In order to provide a context in which to evaluate the individual well test data, regional water level data will be compiled and evaluated. The Engineer will review the regional monitoring well network and obtain available water level data for the past 10 years for up to three wells to establish a baseline to evaluate well performance. Trend graphs will be constructed that may be used by the County for comparison purposes. (b.1 132