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March 25, 1988 <br /> Page 2 <br /> SPECIFIC COMMENTS <br /> 1. Hollow-stem auger drilling equipment will be used to install all <br /> shallow monitoring wells. <br /> 2. For the deep wells, the drive casing will be pulled prior to or <br /> during actual well construction to eliminate any pathways for <br /> vertical migration of surface water or ground water. <br /> 3.. Volclay grout and or cement-bentonite grout-will be used to seal <br /> the well casing. <br /> 4. All monitoring wells greater than 150 feet deep will be con- <br /> structed of Schedule 80 polyvinyl chloride (PVC) casing. <br /> 5. A letter from the manufacturer will be submitted with the SWAT <br /> report stating that the PVC casing and screen meets or exceeds <br /> the specifications set by the National Sanitation Foundation. <br /> 6. All deep monitoring wells (casings and screens) will be suspended <br /> from the surface during construction and will not rest on the <br /> bottom of the borehole. <br /> 7. The following U.S. Environmental Protection Agency (EPA) analyti- <br /> cal methods will be used to analyze organic compounds for samples <br /> collected for the water-quality program: <br /> • Volatile organics using EPA *Method 601 and 602 <br /> • Semivolatile organics using EPA Method 625 <br /> • Pesticides and polychlorinated biphenyls using EPA <br /> Method 608 <br /> 8. The water-quality program will include analysis for hexavalent <br /> chromium+6 using EPA Method 7197. <br /> 9. Soil samples will be collected on 5-foot intervals with a split- <br /> spoon sampler from Boring - (and from Boring MW-5 if it is <br /> drilled) . The soil samples will be split, and a composite will <br /> be made for each boring. The composite sample will be used for <br /> the soil-pore liquid analysis. <br /> 10. Three additional shallow borings will be drilled along the <br /> property line adjacent to Corral Hollow Creek to characterize the <br /> unsaturated zone at the site. The borings will be drilled using <br /> hollow-stem auger equipment, and samples will be taken at 5-foot <br /> intervals to a depth of at least 35 feet. A composite soil <br /> sample will be made for each boring. If perched water is encoun- <br /> tered a monitoring well will be installed in the borehole. The <br /> location of these borings are shown on Figure I. <br />