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1 <br /> 1 CLEARWATER . <br /> G R O U P, F N C. <br /> All wells will be surveyed to the north side of the top of casing for elevations <br /> to the.nearest ±-0.01 foot. Elevations will be referenced either to mean. sea <br /> 1 level or to a project datum. A- project datum is typically chosen for its_ <br /> location such that it will remain unchanged in the .event of site construction <br /> or other site .disturbances. Where required, the wells- will be surveyed by. a <br /> 1' : licensed land surveyor, relative to the nearest benchmark. M1 . <br />' Well Development <br /> Ail''newly-installed wells will be developed prior to, sampling to remove fine <br />' grained sediments from the well and stabilize the filter pack-and the disturbed <br /> Aquifer- materials. Well development.will consist of surging with a surge <br /> block and removing water-from the well.with either a pump or bailer, until <br />' = the well is free of sediment, or after 10 well casing volumes have been <br /> removed. Where appropriate, temperature, pH, specific conductance and' <br /> turbidity will be monitored during well development. .. All development <br /> I equipment'.will-be _cleaned prior to use and .between wells with an Alconox <br /> solution, then rinsed .in clean water. All data. collected during development <br /> will be presented on the well development data sheet. <br /> IGround Water Sampling <br /> Prior to the start of work, a-decontamination area will be established. This <br /> will be in a secured area.and consist of an Alconox solution wash, a first rinse <br /> and a second rinse. Any down hole equipment will be decontaminated prior. <br /> to use. . <br /> Prior to purging and sampling any well, the- static water level will be <br /> measured with an electronic water sounder or an oil/water interface probe to <br /> the.nearest --0.01 foot. If floating product is detected, interface probe results <br /> will be confirmed by lowering a clear disposable polyethylene bailer.down the <br /> well and measuring the product thickness to'the nearest_±0.01 foot, in the <br /> bailer. 'Any monitoring well containing detectable- amounts of floating <br /> product will riot be .purged, or sampled. Field observations such as well <br /> integrity, as well- as water level measurements and floating product <br /> Ithicknesses will be noted on the gauging data/purge calculations form. <br /> All monitoring wells to be sampled shall be purged I using either a PVC bailer or a submersible pump. Physical parameters (pH, . temperature and <br /> conductivity) of the purge water will be monitored for stabilization during <br /> I <br /> 3 <br /> CLEARWATER GROUP,INC. April 28, 1995 <br /> I <br />