Laserfiche WebLink
13 November 2000 <br /> AGE-NC Project No_ 98-004 <br /> Page S of'10 <br /> A nominal two-foot bentonite seal (pelf plug non-coded bentonite pellets) will be placed above the <br /> filter pack to minimize the potential for grout penetration into the screened section of the well. The <br /> bentonite seal will be formed by pouring bentonite pellets into the annulus and allowing them to <br /> settle on the filter pack. The bentonite pellets will be allowed to hydrate for a minimum of one-half <br /> hour prior to grouting_ <br /> The remaining annular space will be filled within one loot of the ground surface with a cement grout. <br /> The{Trout mixture will consist of Type 1/11 portland neat cement and not more than 6 gallons of water <br /> per 94-pound sack of cement. The grout will be placed by pumping through tremmie pipe. A <br /> grouting inspection will be scheduled with P11S-EHD personnel. <br /> Following completion of the monitoring wells, well elevations and locations will be surveyed by <br /> :1G1= personnel, relative to monitoring well MW-1 or a City of Stockton elevation benchmark. <br /> 4.3. WELL DEVELOPMENT/SAMPLING <br /> Development of the proposed wells will consist of a combination of bailing with a stainless steel <br /> bailer to remove the major portion of tine-grained sediment from inside the well, surging to flush <br /> out or draw in sediment from the filter pack and additional ground water evacuation (purging) with <br /> a submersible pump to finish the removal of fine-grained sediment. Developmental purging activities <br /> will be continued until held parameter (pH, electrical conductivity, and temperature) readings have <br /> stabilized and purged water is visually sediment-free. <br /> 4.4, GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with pertinent applicable sampling} <br /> protocols, details of which are presented below. <br /> 4.4.1. Static Water Level Measurements <br /> Before sampling and during quarterly ,,round water monitoring, static water Ievel and free-product <br /> thickness will be measured using an electric oil/water level indicator. Water level data will be <br /> recorded to the nearest 0.01 foot from a reference point marked of the top of the PVC well casing. <br /> Before and after each use, the electric oil/water level indicator will be washed in an Alconox solution <br /> and rinsed with water. <br /> tduanced GvnEnviron mental,Inc. <br />