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Geological Technics Inc Page 4 <br /> Ripon Milling Inc <br /> I Report of Monitoring Well Installation <br /> Project No 253 2 <br /> July 31,1995 <br /> The detection limas for these analyses are es follows benzene,toluene,ethylbenzene, total xylenes 0 3 <br />' gg/l,and T PH-Diesel 50 gg/1 <br /> 2.8 Soil Boring Installation <br />' The soil bonngs will be drilled using a continuous flight hollow stem auger to a total depth to be <br /> determined but not to intercept the groundwater Soil cuttings will either be containerized in DOT <br />' approved 55 gallon drums,labeled or lain on and covered by plastic sheeting,and stored on site until <br /> their proper disposition can be arranged Soil samples will be collected for geological and analytical <br /> evaluation at five foot intervals Soil samples will be collected in 6 0 inch brass liners using a 2 0 inch <br /> modified California split spoon sampler All soil samples will be sealed with aluminum foil,capped, <br />' labeled and placed in a cooler at V Celsius for transport to the laboratory following Cham of Custody <br /> protocol <br /> Because every soil sample collected will not be submitted for laboratory analysis,a screening process <br /> will be used to gather additional information through field observation noting sediment type, <br /> especially grain size and clay content, moisture content, visible evidence of contamination, i e, color <br /> change due to reduction of iron or discoloration from hydrocarbons and other pollutants, and the <br />' readings above background on a organic vapor meter (OVM) The OVM is a field portable photo <br /> ionization detector that uses a 10 0 eV lamp to detect compounds with ionization potential below 10 0 <br /> eV(hydrocarbon range) <br /> lieThe soil borings will be closed as follows after the last soil sample has been collected the augers will <br /> be lifted 3 feet and 50 pounds of bentonite will be poured through the hollow stem of the augers and <br />' hydrated with clean tap water A tremae pipe of sufficient length to reach the total depth of the <br /> boring will be installed through the center of the hollow stem augers and then the augers will be <br /> withdrawn from the hole The borehole annulus will be closed by pumping a neat cement grout <br /> (a4%bentonite/cement) through the tremae tube up to grade <br /> 2.9 Monitoring WeII Construction <br /> The monitoring wells will be constructed with 4 0 inch diameter, schedule 40 PVC casing with flush <br /> threaded joints A screened interval will consist of 0 020 inch perforations extending from <br /> approximately 15 feet below and 5 feet above the water table <br />' A number three sand will be used to form a filter pack about the saturated zone(0 020") perforations <br /> and will extend two feet above this screened interval An annular seal will be constructed by <br /> installing 100 pounds of granular bentonite that will be hydrated with tap water and be allowed to <br /> expand for a period of one hour In the remaining annulus, neat cement grout will be installed using <br /> a slurry pump and tremae pipe <br /> The well will be secured with a water tight locking cap encased within a traffic safe well box A well <br /> construction schematic is attached as Figure 3 <br />' Relative well collar elevations may be surveyed by a competent surveyor <br /> r <br />