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• <br />Mr. Gerald Djuth <br />January 20, 2006 <br />Page 3 <br />• <br />will be connected to the treatment system manifold and a sampling port will be installed <br />at the treatment system. <br />Well Construction Specifications ill follow <br />mental <br />The extraction well design and installation�i1995a) The amonitorimia onitoring be <br />Protection Agency (Cal EPA) guidance (Cal EP <br />constructed using 4 -inch I.D., Schedule 40, flush -threaded PVC casing. The intake <br />screen will be PVC with 0.020 -inch factory andlglues will not be used ots. A threaded cap shall be <br />installed at the bottom of the casing. Organic solvent <br />Filter sand will be emplaced from the base of the borehole h the to approximof atel 2-feehlowt <br />above the top of the screened interval by pouring sand throub <br />ill be lifted from the bottom of the interval at the same rate <br />stem augers. The augers w <br />ity and the top of the sand will be tagged <br />that the filter sand is emplaced by grav <br />line to confirm the fill depth. The sand gradation will be <br />periodically with a sounding <br />Lonestar #2/12 Monterey or equivalent. <br />to ium <br />A minimum 2 -foot thick bentonite seal consisting of 1/4-1 ov the filter pack. -inch sodThe <br />bentonite pellets that are free of additives will be emplaced ab <br />granular bentonite will be located above the water table and will be emplaced by slowly <br />pouring the pellets through the hollow -stem augers. After placement of the seal material, <br />sufficient water will be added and the bentonite will be allowed to hydrate. <br />Theg rout seal will extend from the top of the bentonite seal to a depthof <br />for as otherwise <br />below the surface. The grout will be mixed in the following prop <br />specified by the SJC/EHD: <br />• Neat Type I Portland Cement: 94 pounds (I sack)(orPI Class /10 sack)) <br />• Pure Sodium Bentonite Powder: 3 to 5 pounds (approx. <br />• Potable Water: 5 gallons <br />Grout will be emplaced from the bottom up using a grout pipe. Grouting will be <br />inspected and approved by the SJC/EHD. The well boxace with a tpraffoprated cwill oovertplate <br />of a <br />recessed casing mounted in an 18 -in by 24 -in <br />(Figure 2). <br />Well Development <br />The monitoring well will be developed per Cal EPA guidance (Cal EPA 1995a) by <br />pumping, surging, and bailing until, to the extent possible, sediments in the bottom of the <br />well are removed, the extracted water becomes clear, and all indicator parameters become <br />stable. As development proceeds, the quantity of water will be monitored and water <br />quality parameters (pH, temperature, and electrical conductivity) will be measured at least <br />