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i Volume of Open Borehole and Annular Space Between Casing and Hole • Volume/ Volume/ Hole linear ft. Nominal linear ft. of* Diameter of hole Casing Diameter Annular Space (inches) Gal. Cu. ft. (inches) Gal. Cu. Ft. ----------------------------------------------------------------- 7.25 2. 14 0.29 2 1.91 0.26 8.25 2.78 0.37 2 2.55 0.34 10.25 4.29 0.57 2 4.06 0.54 10.25 4.29 0.57 4 3.46 0.46 12.25 6.13 0.82 4 5.30 0.71 *Note: Annular volumes will be multiplied by 30% to account for porosity of filter pack. If the aquifer is slow to recharge, development will continue until recharge is too slow to practically continue. The volume of water produced versus time will be recorded. All withdrawn groundwater will be stored on-site in 55 • gallon waste drums unless permission is granted by the appropriate regulatory agency to discharge the water to the ground surface or sanitary sewer. Drummed water will be labeled with the source of the water to help ensure appropriate disposal based on contamination levels. 11.0 Soil Sampling Protocol 11.1 Sample Collection During Drilling Activities A proposal will be submitted to the lead Regulatory Authority with proposed boring/sampling locations. The exact location and number of borings at each site will be determined in the field by the Project Geologist/Engineer. Prior to arriving at the sample site, the drill rig/augers will be steam cleaned and all sample equipment will be cleaned. Cleaning will be conducted on-site on all sampling equipment between each sample interval. Soil samples will be obtained using a California modified split-spoon sampler containing three, six inch long, two inch diameter brass tubes. The sampler will be driven 18 inches ahead of the hollow stem auger by a 140 pound hammer with a 30 inch drop in accordance with American Society for