Laserfiche WebLink
2$ June 1999 <br /> AGE-NC Project No 97-0333 <br /> Page 8 of 9 <br /> the potential for grout penetration into the screened section of the well The bentonite seal will be <br /> formed by pounng bentonite chips into the annulus and allowing them to settle on the filter pack <br /> Bentonite chaps will be hydrated using approximate) fiveafons of tap water The bentonite chips <br /> will be allowed to hydrate for a minimum of one-half hour nor to grouting <br /> The remaining annular space will be filled to the ground surface with a cement grout The grout <br /> mixture will consist of Type I/II portland neat cement and not more than 6 gallons of water per 94- <br /> pound sack of cement The grout will be placed by pumping through tremmie pipe A grouting <br /> inspection will be scheduled with PHS-EHD personnel A proposed ground water monitoring well <br /> construction diagram is depicted in Figure 3 <br /> 43 WELL DEVELOPMENT <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 and purged <br /> water is visually sediment-free <br /> 44 GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance %vith PHS-EHD guidelines )San <br /> Joaquin County Public Health Services Environmental Health Division i'Vell Standards) and <br /> CVRWQCB guidelines )Tri-Regional Water Quality Control Board Recommendations for <br /> Preliminary Investigations and Evaluation of Undergi ound Storage Tanks) sampling protocols <br /> 4 4 1 Static Water Level Measurements <br /> Prior to purging and sampling during quarterly groundwater monitoring events and initial sampling <br /> event, static water level in each well will be measured using an electric water level indicator Water <br /> level data will be recorded to the nearest 0 01 foot from a reference point marked on the top of the <br /> PVC well casing Before and after each use, the measurement device will be rinsed with water <br /> 4 4 2 Well Evacuation j <br /> Subsequent to measurement of depth to watei and pnor to sampling, each NNell will be purged using <br /> AdtiancedGeoLmiron inenta[ int <br />