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Pngc 3 of 9 <br />SOF NUMBER 0.0 Pump Testing <br />The constant -rate test will involve pumping the well at a constant discharge rate for up to 72 <br />hours, or until water levels generally stabilize in both the pumping well and observation wells. <br />The pumping rate at which the constant -rate test is conducted will be calculated from results of <br />the step - discharge test. <br />During the test, water -level data will be collected continuously in the pumping well and <br />observation wells on a logarithmic time schedule as described below. <br />o Water level data from the pumping well and surrounding observation wells (located within a <br />radial distance of 400 feet from the pumping well) will be collected continuously using <br />pressure transducers and a Hermit 3000 data logger. Water levels will be measured <br />according to the following time schedule: <br />0 to 10 minutes: 0.5- to 1- second intervals <br />10 to 15 minutes: 12- second intervals <br />15 to 100 minutes: 2- minute intervals <br />100 to 1,000 minutes: 30- minute intervals <br />1,000 to 10,000 minutes: 200 - minute intervals <br />Observation wells located greater than 400 feet from the pumping well should be monitored <br />manually at the following time schedule, if possible: <br />0 to 1,000 minutes: 120 - minute intervals <br />1,000 to 10,000 minutes: 480- muiute intervals <br />In addition, manual water level measurements should be collected from the pumping well and <br />all observation wells equipped with pressure transducers at the following time schedule, if <br />possible: <br />- 0 to 240 minutes: 15- minute intervals <br />- 240 minutes to 10,000 minutes: 120- minute intervals <br />All manual water level measurements will be recorded on Aquifer Test Data Forms <br />(Appendix 1). <br />A detailed list of activities to be performed during the constant -rate test follows. <br />o Prior to initiating the constant -rate test, static water level will be measured in all observation <br />wells and in the pumping well (to nearest 0.01- foot). Measurements will be made from a <br />surveyed reference point on the well or from top of casing. <br />• The start time of the data logger will be synchronized with that of the pump. This can be <br />accomplished with hand signals or with the delayed start feature on the Hermit 3000. Ensure <br />that the pump does not start before the data logger so that the initial water level is recorded. <br />• At the start of the pumping test, record the date and tinge. <br />e Monitor the pumping well discharge rate and maintain a constant flow. Monitor the pumping <br />rate every 15 minutes during the first four hours and at 30- minute intervals throughout the <br />0 -3 <br />