2016-07-14_PERMIT FILE - M2016010 ‎(4)‎

• Permit No: M2016010
• IBM Index Class Name: Permit File
• Doc Date: 7/14/2016
• Doc Name: Adequacy Review Response
• From: Transit-Mix Concrete Co.
• To: DRMS
• Email Name: AME
• Media Type: D
• Archive: No

Transit Mix Concrete Co.
Figure 2—Surface Water Feature Location Map
173) Comment: This figure shows a seep area present south of Little Turkey Creek which
appears to be approximately 350-500 feet from the creek. Are these natural seeps coming
from the creek fault zone?Or are they coming from the adjacent bedrock?If they are
coming from the bedrock, does this suggest that the bedrock water table is actually
higher in elevation than estimated in this exhibit?
Response: Discussions with the landowner combined with the rock outcrop in this
area suggest the presence of these seeps. There appears to only be seepage flow
during wet years and no flows have been seen during site visits from Norwest
personnel. Norwest's interpretation is that these seeps are related to near surface
flows during wet years and not related to an aquifer.
174) Comment: The seep area appears to be located just downgradient of the proposed
topsoil stockpile area(TS 1). Of course,this is a more optimal situation compared with
seeps coming from upgradient of the proposed stockpile. However,does the applicant
anticipate any issues with accessing or stabilizing this stockpile due to the seeps?
Response: A stability evaluation of the stockpiles (including TS1)is included in
Exhibit 6.5. This evaluation considers the presence of near surface waters and
demonstrates that a toe berm is required to maintain stockpile stability at a factor
of safety of 1.5. Lower-bound published values were used for the stability
evaluation to be conservative,and Transit Mix/Norwest postulate that site specific
strength parameters of the stockpiled topsoil and surficial geology may result in
decreasing or removing the toe berm.
175) Comment: Once the operation begins mining the South Pit, does the applicant
anticipate any slope stability issues along the northern pit wall related to the seep area?
Response: During mining of the South Pit this area will be mined out along with
the upland area that is considered the contributing area. Since the area will be
mined out, the seeps and their source are not expected to cause slope stability issues
related to the pit walls. The pitwall evaluation included in Exhibit 6.5 demonstrates
that the pitwall will be stable regardless of the presence of a seep in this area. The
evaluation placed the water table at the surface to be conservative.
EXHIBIT H-Wildlife Information (Rule 6.4.8):
Threatened and Endangered Species
176) Comment: The text states that under U.S. Fish and Wildlife Service's(USFWS)
direction, a second survey for Mexican spotted owl will be completed at the site in 2016,
and further consultation with USFWS will occur after the survey to avoid or minimize
Hitch Rack Ranch Quarry (M-2016-010)
Response to Comments—July 14, 2016