_INSPECTION - C1981035 ‎(44)‎

• Permit No: C1981035
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 6/17/2008
• Email Name: TAK
• Media Type: D
• Archive: No

above the bottom of the pond. The risers have oil skimmers. (The operator had explained during a
previous inspection that anti-seepage collars were in place on the spillway culverts where the culverts
go through the earthen pond embankment.) The top of the pond embankment was approximately 11
feet above the bottom of the pond. The top of the embankment was more than 10 feet wide at all
locations around the perimeter of the pond. All previously mentioned dimensions appeared consistent
with drawing King II-007C. Slope magnitudes of the embankment inslopes and outslopes appeared
consistent with drawing King II-007C. Rock riprap has been placed in the two inlet areas on the north
end of the pond, as specified in the original design. Two items that are shown on the King II-007C
drawing that have not been completed are a decant valve on the principal spillway(shown in Detail B
of drawing King II-007C) and a catwalk that extends from the embankment to the spillway risers
(shown in Detail A of drawing King II-007C). The operator is researching completion of these items.
The decant valve and catwalk should be completed so that PE-certified as-built design drawings and
calculations can be submitted.
King I Ditches and Culverts - The east upland diversion ditch appeared in good condition. The
operator has removed the tree from the ditch and has removed the debris from the inlet end of the
plastic pipe that were found during DRMS's inspection on June 4, 2008. Some of the rocks have been
removed from the inlet of the culvert in the west upland diversion that were reported on the June 4
inspection. More of these rocks need to be removed in order to ensure the continuing proper function
of this culvert. Sediment has been removed from the eroded debris screen that was shown in Photo 9
of the June 4, 2008 inspection report. The dismantled equipment that partially blocks the inlet of the
affected area culvert(Photo 11 in June 4, 2008 inspection report) has not been removed. The outlet of
this culvert remains partially blocked with sediment. The inlet and outlet of this culvert should be
cleared to ensure continued proper functioning of this culvert.
King II Ditches and Culverts—An updated design needs to be submitted as a Technical Revision to
show the two 24-inch diameter culverts that were installed in the north(inlet) end of the pond. The
approved design drawing (King II-007B) shows a single 48-inch culvert. Approved design drawing
King II-007B specifies riprap that is yet to be installed in ditches undisturbed drainage ditches UDD-1,
UDD-2, UDD-3, and UDD-4. Drawing King II-007B also specifies a maximum 2:1 sideslope for all
four undisturbed drainage ditches, which locally may be impractical to achieve because it would be
necessary to cut into a hillslope that naturally is steeper than 2:1. The four undisturbed drainage
ditches do not extend as far along the undisturbed area north of the portal as they are shown on
drawing King II-007B. Not extending the ditches further would require a demonstration showing the
pond capacity is sufficient for handling the additional runoff resulting from not extending the ditches.
Such a demonstration would need to be a hydrologic analysis (e.g. SEDCAD or similar analysis)
submitted as a Technical Revision for adding to the permit application.
Monitoring Wells - No problems were found with King I's downstream alluvial monitoring well (the
Wiltze well) and King II's downstream alluvial monitoring well (in the middle of Hay Gulch).
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