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. NYD <br /> ENVI NTAL <br /> 1'ECIIN ,INC. <br /> 3.2 Monitoring Well Construction <br /> All monitoring wells were constructed of two-inch diameter PVC casing and <br /> machine slotted 0.020-inch schedule 40 PVC well screen. The annulus around the <br /> well casing and screen was filled with clean #3 sand. A one foot thick layer of <br /> bentonite pellets was laced above the sand pack and hydrated to form a seal. The <br /> P P P Y <br /> remainder of each'borehole was grouted to the surface, and finished above grade in <br /> a stove-pipe well protector. Well construction diagrams for each well are included <br /> in Appendix D. <br /> 3.3 Ground Water Gauging, Sampling and Analysis <br /> On July 26, 1993 HETI gauged each well for depth to water and depth to bottom. <br /> The wells were then developed by a combination of surging and bailing of at least <br /> ten well volumes, until pH, temperature and conductivity stabilized, or until the <br /> well went dry. Purged water was stored .on-site in 55-gallon drums. Well <br /> development information is presented on the Purge/Sample Data Sheets in <br /> Appendix E. <br /> r . Following recovery of water levels to at least 80% oftheir original levels, ground <br /> L� <br /> water samples were collected, using dedicated teflon bailers. Samples were then <br /> labeled, documented on chain-of-custody forms, and stored in a chilled cooler for <br /> transport to the analytical laboratory. <br /> Ground water samples were analyzed for Volatile Organic Compounds (VOC) b <br /> P Y g P Y <br /> EPA Method 8240, Extractable Organic Compounds (EOC) by EPA Method 8270 and <br /> for the CAM 17 Metals. Water sample analyses were performed by PACE, Inc. a state <br /> DHS-certified laboratory. <br /> Following development, the locations and elevations of top-of-casing of the wells <br /> were surveyed. <br /> 5 <br />