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Drive Prove Schematic <br /> T _ <br /> I <br /> III <br /> Plate _.1-�N --- 4 in. --y1 <br /> Weld Plate -4��r}.- Center i <br /> Here 7/8 it Holel2 bop Rand Stock lr <br /> 7 in <br /> s. <br /> Hanmer <br /> I Weld Pate Chamfer <br /> Here 3/16 in. <br /> 4 f t. Plate -M 2 V2 k N- 1 <br /> ChamferI Plate / VI6 it <br /> fw4 .7 4 in ilia <br /> in. Galvanized Water Pipe Center 7/8 in. Hole <br /> 8 ft. CI_ I/2 in. Merchant <br /> Coupwng <br /> 11,.___ 1/2 it. Ppe <br /> 4 ft. I Williamson Drive Probe is a "relative density or consistency" <br /> Drive P ro exploration device which is used to determine the distribution and to <br /> be <br /> Tip estimate strength or compaction of the subsurface soil and <br /> decomposed rock units. The resistance to penetration is measured <br /> in blows-per-1/2 foot of an 12-pound hammer which free falls <br /> Drill 3/16 in Hole roughly 3.5 feet driving the 1/22inch diameter pipe into the ground. <br /> _a_ 90 dig' Apart This measure of resistance to penetration can be used effectively to <br /> 2 in. estimate relative density of soils,especially for utility trenches. For <br /> A a more detailed description of this geotechnical exploration / <br /> ammaterials testing method, please refer to Volume I, United States <br /> 1 Y ME Department of Agriculture, EM-7170-13,August 1994, p. 317-321. <br /> — A representative schematic of WDP is shown here. <br /> Reference:Figure 3.6.1,Appendix 3.6, Page No.321,USDA EM-7170-13,August 1994,Volume I <br /> �a13'4 <br />