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Section No 6 • <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 46 of 55 <br /> ■ all field equipment should be decontaminated using a detergent <br /> solution or- steam- followed by a triple distilled water rinse prior <br /> to each use; <br /> ■ all field equipment should be calibrated prior to use and a <br /> permanent record kept of calibration, <br /> ■ all water pumped or transferred during field tests should be stored, <br /> - tested and disposed of in accordance with the procedures in the <br /> sampling and analysis plan and appfica6le state, federal and local <br /> regulations, <br /> ■ factors potentially reflecting the hydraulic parameters being <br /> monitored should be observed and recorded, these include <br /> recent rainfall, <br /> surface water ponding and drainage, <br /> local irrigation practices, <br /> known water leaks, <br /> vicinity to neighboring streams , ponds, and other surface water <br /> bodies, <br /> tidal effects <br /> 5 <br /> -- - Prior to the initiation of-field work-associated with the-evaluation of-- <br /> hydraulic properties, field personnel should consult with the Project Manager <br /> and become familiar with the purpose of the field effort and relative <br /> importance of the factors listed above <br /> 6 9 2 Water Level Measurements <br /> Water level measurements will be made using an electric well sounding <br /> device or using the chalked tape method An electric well sounder for <br /> measuring depth to water (DTW) consists of an electrode fastened to the end <br /> of two wire cables, and a light, ammeter, or buzzer which indicates a closed <br /> circuit when the electrode makes contact with water The two-wire cables are <br /> commonly marked at regular intervals <br /> • <br /> 6-46 <br />