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%�' tIuA�IIestowBem' <br />t= „icr ;9 Pcu44ltG <br />As discussed previously, triaxial shear testing on a sample of the gob indicated a <br />drained friction angle of 30 °. However, due to the limitations of the testing apparatus, <br />triaxial shear testing can only be completed on the sand, silt, and clay fraction of the <br />material. Based upon our observations of the gob material, there is a significant <br />percentage of larger material and the large particles will tend to increase the shear <br />strength of the material. For the purposes of modeling, a friction angle of 30° was used <br />for the gob in the analyses. However, it is important to note that this value is <br />conservative as the actual shear strength of the gob is likely higher than indicated in the <br />laboratory testing. <br />Based upon the available data, the following parameters were utilized for the <br />compacted gob. <br />• y =104.6 pcf <br />+ c' =0psf <br />+ V = 30° <br />Native Foundation Soils <br />Based upon the information in the referenced report, the following parameters <br />were utilized for the native foundation soils. <br />• y = 125 pcf <br />+ c' = 0 psf <br />• �' = 30° <br />4.3 Piezometric Surface <br />Table 1 - Summary of Groundwater monitoring <br />Borehole <br />ID <br />Elevation -Top of <br />Ple <br />5/17/2013 Depth to groundwater <br />Water <br />Level 5/1712013 12112/2006' 1/31/2007' <br />6006-01 <br />(Ft.) <br />5891.9 <br />(Ft.) <br />5843.9 48.0 <br />(Ft.) <br />Dry <br />(Ft.) <br />57.5 <br />BG06.02 <br />5929.7 <br />5913.5 16.2 <br />19.1 <br />19.0 <br />BG06 -03 <br />5916.7 <br />5882.35 34.4 <br />39.3 <br />33.9 <br />BG06-04 <br />Pipe broken off <br />and filled with dirt <br />36.9 <br />27 <br />BG06 -05 <br />5888.9 <br />WA Pry <br />Dry <br />Dry <br />BG06 06 <br />5897.0 <br />WA Dry <br />Dry <br />Dry <br />BG06 -07 <br />5902.5 <br />N/A Dry <br />Dry <br />Dry <br />' Data shown in Suckhorn Geotech Stabltlty analyses dated March 29, 2007 <br />'•All pWometers have been plugged and are no (onge r in service <br />. One of the piezometers (BG06 -2) installed on the north.edge of the gob pile #3 <br />footprint indicated groundwater at an elevation of 5913.5 feet. The other piezometer <br />(BG06 -03) installed in the northern portion of the gob pile footprint encountered <br />groundwater at an elevation of 5882.35 feet. HBET understands that piezometer BG06- <br />02 was installed in the vicinity of seepage from the adjacent irrigation canal and that an <br />underdrain was installed below the gob pile in this area to intercept the seepage. <br />.X-UM ALL PROJECTSI W499 - rE Stover Assodates iae.00499 oI soN;e ,%roeuao - cedcob 3'Re ision aa0-4s9 -=3 R052114 Rldoc 3 <br />