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CLEARW.�kTER • G R O i3 P, I N C 1 Tall traffic cones and caution tape will be used to surround the pumping well and associated equipment Traffic cones will also be set over each well that will be monitored during the test The discharge hose and all power cords will be secured to the ground using duct tape. If work is to be performed in the street, an appropriate traffic control plan will be established prior to beginning work FIELD PROCEDURES At least 24 hours prior to the test, a pre-test (step test) will be performed to determine the appropriate flow rate to be used The step test will be conducted in the same well to be used for the discharge test Each step will consist of pumping groundwater from the well at a constant rate until the water level stabilizes or the well goes dry The initial step will be conducted at the lowest flow rate The flow rate will be increased in each subsequent step until the maximum flow rate that can be maintained by the well can-be estimated. start Prior to theof work, a decontamination area will be established. This will be in a secured area and consist of an Alconox solution wash, a first rinse and a second rinse Any down hole equipment will be decontaminated prior to use Prior to equipment set-up, all wells to be monitored during the test will be opened Once the water level within each well has stabilized, the wells will be measured with an electronic water sounder to the nearest ±0.01 foot After all equipment is set-up, as outlined in the previous section, the water level within each well will be measured again and the time will be noted This will be used as the initial water level reading. Prior to starting the pump, the total gallons displayed on the flow meter will be recorded This will be used to determine the total number of gallons extracted from the pumping well Once the pump is turned on, the exact time ' will be recorded The control box will be immediately set to the flow rate established during the pre-test The water level within each well will be measured continuously for the first 30 minutes of the test. For sites with ' more than ten monitoring wells, only those wells in the vicinity of the pumping well, up to 60 feet away, will be monitored for the first 30 minutes. The exact time will be recorded for each measurement taken After the first ' 30 minutes, the water level within all wells to be monitored will be measured every 15 minutes until 90 minutes has elapsed since the test began At this time the interval between measurements will be increased to every 30 minutes This will continue until six hours has elapsed since the test Constant-Discharge Aquifer Test Page 2 of 3 December 16,1994