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22 May 2002 <br /> AGE-NC Project No.01-0877 <br /> Page 8 of 9 <br /> settle on the filter pack.Bentonite chips will be hydrated using five gallons of water. The bentonite <br /> chips will be allowed to hydrate for a minimum of one-half hour prior to grouting. <br /> The remaining annular space above the bentonite seal will be filled to one-half to one foot bsg with <br /> a cement grout. The grout mixture will consist of Type I/II portland neat cement and not more than <br /> 6 gallons of water per 94-pound sack of cement. The grout will be placed by pumping through <br /> tremie pipe. The EHD will be notified for grout inspection at least 72 hours prior to conducting <br /> f_^ grouting procedures. A typical monitoring well design is illustrated on Figure 4. <br /> 4.3. WELL DEVELOPMENT AND SURVEY <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the well, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to finish the removal of sediment.Development activities will be continued until <br /> field parameter(pH,electrical conductivity;and temperature)readings have stabilized.Additionally, <br /> each existing and newly installed well-head elevation will be surveyed by a California-licensed <br /> i <br /> surveyor. <br /> 4.4. GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with the EHD's Recommended <br /> Groundwater Sampling Guidelines, dated 15 February 1995. <br /> 4.4.1. Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator. Water level data will be recorded to the nearest <br /> 0.01-foot from a reference point marked of the top of the P V C well casing.Before and after each use, <br /> the measurement device will be rinsed with water. <br /> r, <br /> 4.4.2. Well Evacuation <br /> ` Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> _ a submersible pump or a disposable bailer to ensure that the sample is representative of the <br /> formation,rather than water standing in the well casing.The well will be purged until: 1)a minimum <br /> Advanced GcoEnvironmental,Inc. <br />