_INSPECTION - C1994082 ‎(70)‎

• Permit No: C1994082
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 4/22/2008
• Email Name: DTM
• Media Type: D
• Archive: No

with total extent of approximately 2.75 acres. A well defined scarp with a height of 10 to 15 feet extends from a
diversion ditch along the west perimeter of the disturbed slope, for a distance of approximately 300 feet to the
east. A less defined scarp, along with associated cracking and bulging extends another 250 to 300 feet. Minor
cracks also extend from the west side perimeter ditch for a short distance to the west, across a portion of the
slope that was not regraded in 2007. Bulging is evident along the toe of the slide, including the southwest corner
of the toe, which extends into Pond 12.
The total topsoiled acreage affected by the slide is approximately 1.75 acres(the southwestern portion of the
failure zone had not been topsoiled). It is likely that recovery of a significant quantity of soil will be possible prior
to remedial grading, but some topsoil will likely be lost due to safety considerations adjacent to the scarp, and
some quantity of soil has been lost due to rill and gully erosion on the slope.
Heavy snowpack and associated high soil moisture level is presumably a major factor in the slope failure.
However, occasional heavier than normal snowpack is an environmental factor that must be taken into account,
and the repeated slope failures that have occurred in this location indicate the need for more intensive remedial
measures.
SUPPORTING EVIDENCE FOR NOV CV-2008-001
Pond Discharge Sample 082-012-1645
On arrival at the Pond 012 location at approximately 8:50 am, 4/22/08, 1 observed that there was a heavy flow
from the primary spillway discharge culvert, and that the discharge water was somewhat turbid. I had left my
sample bottles in my vehicle at the Seneca Mine office, and informed Roy Karo that I wanted to obtain a sample
of the discharge, and would need to return to the site later in the day or the following day to do so. I did return to
the site the afternoon of 4/22/08, and obtained a sample at 4:45 pm. I offered to obtain a sample split for the
operator, which was declined. The discharge appeared to be heavier and darker in appearance than when
observed earlier in the day. The flow stream filled approximately 1/3 of the 24"culvert outlet. I collected the
sample by passing a 1 liter untreated plastic sample bottle back and forth through the discharge stream until full
(after first rinsing the bottle with the discharge). I recorded the sample in my field book as#082-012-1645. 1
marked the sample bottle with this number using a Sharpie permanent marker, obtained a photo at the sample
location, and placed the sample in a cooler, which I packed with snow at the site.
I kept the cooler in my possession, until I returned to Grand Junction, and hand delivered the sample to Cynthia
Bauer at Grand Junction Laboratories at 9:15am on 4/24/08. Settleable Solids analysis was run at 11:00 to
12:00 on 4/24/08, well within the applicable 48 hour holding time for the parameter. See Chain of Custody Form,
"PH General Report Sheet"for Settleable Solids, Lab#6189, and the analysis report dated 4/28/08, attached
(Lab#6189, Sample ID 082-012-1645), which indicates total suspended solids (TSS) level of 952 mg/I and
settleable solids (SS) level of 0.9 ml/I. Because snowmelt was in progress and was the major source of inflow to
Pond 012 when the sample was collected, the TSS limit was not in effect. Unless the operator demonstrates that
the runoff was in excess of the 10-year, 24-hour event,the settleable solids limit of 0.5 ml/I does apply, and was
exceeded.
4122108 Digital Photos
I took a number of digital photos depicting site conditions relevant to the enforcement action, which are included
and described on the following pages.
4