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• A well reference measuring point will be placed on the north side of the monitoring <br /> well casing. The location and elevation of the top of casing at the reference point <br /> of the newly installed well and existing well will be surveyed relative to mean sea <br /> level by a licensed surveyor to second order accuracy. <br /> • The water level and depth to the bottom of the well will be measured to the nearest <br /> 0.01-foot using an electronic water level indicator. The presence of free-phase <br /> petroleum product will be assessed. <br /> Well Development Procedures <br /> • Well development will be conducted by initially surging the well with a surge <br /> block, followed by removal of water with a pump and/or bailer. Surging will be <br /> conducted over 5-foot intervals of the screened well casing, beginning at the <br /> bottom of the well. Surging should be conducted at least twice over the entire <br /> length of the well screen. Well development activities will be recorded on well <br /> development forms. <br /> • A minimum of five well casing volumes of water will be removed from the well <br /> during development. The temperature, conductivity, and pH of the groundwater <br /> removed during development of the well will be monitored. Development should <br /> continue until the measured groundwater parameters have stabilized and the <br /> turbidity of the water removed has decreased to a degree as judged acceptable. <br /> • Water removed from the well will be contained in 55-gallon United Nations <br /> approved drums. Labels will be placed on the drums with the contents,date,well <br /> number, and job number recorded on the label. The drums will be stored at the site <br /> pending laboratory analysis of the groundwater. <br /> Groundwater Sampling Procedures <br /> • Field activities and equipment utilization will be recorded on field report forms. <br /> • A disposable polyethylene or stainless steel bottom valve bailer will be used for <br /> collection of each groundwater sample. Polyethylene bailers will be discarded after <br /> each sample is collected. Stainless steel bailers will be washed between wells <br /> using a bristle brush with a detergent rinse followed by two clear water rinses, and <br /> a final deionized/distilled water rinse. The bailers will be air dried or dried using <br /> paper towels. <br /> • New nylon rope will be used to lower the bailers into the wells. The nylon rope <br /> will be discarded after each well. <br /> • Groundwater samples will be placed into laboratory-supplied containers containing <br /> preservatives. <br /> • Groundwater will be discharged from the bailer via a bottom-emptying device. <br /> Discharge to the containers should be conducted in a manner to minimize bubbling <br /> NAsacDP\2001\PRJ\PJ8\8800401 A.1 ac.doc B-3 <br /> 12/12/01 <br />