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• 28 November 2003 AGE-NC Project No 95-0109 Page 6 of 7 A normnal two-foot thick bentonite seal will be placed above the filter pack to minimize grout penetration into the screened section of the well The bentonite seal will be formed by pouring - . bentonite chips into the annular space between the auger and the well casing and allowing the chips T - to settle on the filter pack The bentomte 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 groutmg 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 vII portland neat cement and not more than 6 gallons of water per 94-pound sack of cement The grout will be placed by pumping through tremmie pipe The San Joaquin County Environmental Health Department (SJCEHD)will be notified for grout inspection at least 48 hours prior to conducting grouting procedures A typical monitoring well diagram is illustrated on Figure 3 4 3 WELL DEVELOPMENT AND SURVEY Development will consist of a combination of bailing to remove the mayor 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 containerized 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 4 4 GROUNDWATER SANUIPLING PROCEDURES Ground water sample collection will be performed in accordance with the guidelines established by SJCEHD for sampling ground water monitoring wells 4 4 1 Static Water Level Measurements Before purging and sampling during ground water monitoring events, static water level will be 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 Advanced GeoEnvironmental,Inc a