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r . • 14 September 2001 AGE-NC Project No 95-0109 IPage 8 of 9 to settle on the filter pack The bentonite chips will be hydrated using five gallons of water The bentonite chips will be allowed to hydrate for a minimum of one-half hour prior to grouting ' The remaining annular space above the bentonite seal will be filled to within one foot of the ground surface with a cement grout The grout mixture will consist of Type UII portland neat cement and not more than 6 gallons ofwater per 94-pound sack of cement The grout will be placed by pumping through tremmie pipe The PHS-EHD will be notified for grout inspection at least 48 hours prior to conducting grouting procedures A typical monitoring well diagram is illustrated on Figure 6 4 5 WELL DEVELOPMENT AND SURVEY iDevelopment will consist of a combination of bailing to remove the major portion of fine-grained sediment from inside the well, surging,to flush out or draw in sediment from the filter pack, and additional bailing to finish the removal of sediment Development activities will be continued until field parameter (pH, electrical conductivity, and temperature) readings have stabilized Purged ground water will be containenzed in properly labeled DOT-approved model 17H 55-gallon drums • and stored on-site Additionally, each well-head elevation and well location will be surveyed by a California-licensed surveyor relative to the closest San Joaquin County or City of Lodi benchmark 46 GROUNDWATER SAMPLING PROCEDURES w Ground water sample collection-will be performed in accordance with the guidelines established by San Joaquin County PHS-EHD for sampling ground water monitoring wells ■ 4 6 1 Static Water Level Measurements , Before purging and sampling during ground water monitoring events, static water level will be N measured using an electric water level indicator Water level data will be recorded to the nearest _ 0 01- foot from a reference point marked of the top of the PVC well casing Water level and the time of the measurement will be recorded on a field log Before and after each use, the measurement device will be rinsed with water 4 6 2 Well Evacuation Subsequent to measurement of depth to water and prior to sampling, the well will be purged using a submersible pump `or a disposable bailer to ensure`that the sample is representative of the formation,rather than water,standing in the well casing The well will be purged until 1)a minimum r 5 Advanced GeoEnwronmental,Inc r i c