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2015-03-11_REPORT - M1974004
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2015-03-11_REPORT - M1974004
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Last modified
8/24/2016 5:58:12 PM
Creation date
3/18/2015 9:48:30 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1974004
IBM Index Class Name
REPORT
Doc Date
3/11/2015
Doc Name
Annual Report Fee Map
From
Martin Marietta Materials, Inc.
To
DRMS
Email Name
MAC
Media Type
D
Archive
No
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Martin Marietta Materials <br />Spec -Agg 2015 Annual Report <br />5.0 FIELD OBSERVATIONS <br />Field observations for the 2015 annual report consisted of rock structure mapping and collecting of <br />information regarding areas of visible, large -scale instability, seepage, and mining activity. Observations <br />for the current annual report were made during two site visits taking place in June and December 2014. <br />During our visits, we performed rock structure mapping to collect representative discontinuity <br />measurements from recently mined rock exposures in the Southern Expansion Areas (Figure 2; Photos 1 <br />through 3). Orientation measurements (i.e., dip /dip direction) of joints, foliation, and faults were taken <br />from the faces of advancing benches. A geological compass was used to obtain discontinuity <br />measurements both indirectly by sighting along the discontinuity surfaces and, where deemed safe, by <br />direct measurement on the discontinuity surfaces. A handheld GPS was used to record the location of <br />data collection points (Figure 2). <br />A total of 58 discontinuity measurements were collected at six data collection points, and were added to <br />the measurements from previous years. When combined with data collected from previous annual <br />reports (1997 -2002, 2004 -2014) and with borehole geophysical data collected during the 2003 <br />geotechnical investigation, a total of 3,280 discontinuity orientation measurements have been obtained <br />over the past 18 years. Figure 5 shows the 58 discontinuity orientation measurements collected for this <br />annual report overlain on a contour stereonet plot of the entire Spec -Agg structural dataset. <br />During our June and December 2014 site visits, we observed two newly fault exposures (probably the <br />same one) along the temporary excavation wall in the Southern Expansion Area at stations 15 -03 and 15- <br />06 (Figure 3 and Photo 3). The fault is oriented approximately east -west, with dip /dip direction of 76- <br />82/165 -175 and was exposed in the north facing temporary wall of the expansion area. The fault zone <br />consists of weathered, broken and blocky rock, with parallel fracturing, and iron - stained slickenside <br />surfaces with local clayey gouge. The location of this fault is, in general, a good match with the <br />previously mapped trace. The apparent width of the fault zone varies from 3 to 5 feet. <br />The fault orientation measurements for this annual report are presented with previous fault <br />measurements and differentiated by the fault feature they represent in Figure 4. <br />Minor raveling conditions resulting from rock fragmentation during blasting and subsequent freeze /thaw <br />conditions exist along each wall in the quarry, but appear more prevalent along the south wall possibly <br />due to the north facing exposure. <br />The quarry walls observed during the 2014 site visits appeared to be relatively dry; and noticeably absent <br />is any major seepage in the southwest corner of the main pit, which had been documented in prior reports <br />as having occasion seeps visible. Other than minor seepage observed along the temporary access road <br />to the Southern Expansion Areas, no major seepage was observed. Additionally, we observed standing <br />water in the sump of the Main Pit; however, the sump pump was not operating (the pump only operates <br />three to four hours per day in normal weather conditions). Reportedly, during the September 12 -13, 2013 <br />historic rainfall event in Colorado, water flowing from highwalls caused some minor damage to temporary <br />rock barriers along the temporary quarry access road. <br />The northern faces of the Main Pit were modified after planar failure along foliation planes in 1998 and <br />1999. Based on visual inspection from the access road and bottom of the pit, these slopes did not appear <br />to show signs of additional movement during the site visits for this study (Photo 4). As previously <br />February 25, 2015 Page 6 Lachel & Associates, Inc. <br />Project 14364006 00 ©2015 All Rights Reserved <br />
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