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GENERAL38469
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GENERAL38469
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Last modified
8/24/2016 7:58:14 PM
Creation date
11/23/2007 9:41:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
General Documents
Doc Name
1996 EROSION INVENTORY REPORT
Media Type
D
Archive
No
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South of Shop <br />The narrow strip across the westerly facing slope in the South of Shop Area that remains under <br />bond was inventoried. The area was divided in the same manner as in previous surveys for <br />consistency and is shown on Exhibft 1, Sheet 2 of 2. The concentrated flow feature referenced in <br />previous reports was also measured. <br />Concentrated Flow Feature No. 1 <br />The location of Concentrated Flow Feature No. 1 is shown in Exhibit 1, Sheet 2 of 2. The feature <br />appears to be reasonably stable with either cobble armoring or vegetation present at the base <br />and side slopes of most of the sections. The 5 cross sections measured in previous reports were <br />measured again and the results are listed below. Graphical representation of these <br />measurements are found in Appendix A -South of Shop Concentrated Flow feature 1. The cross <br />sections are ordered from highest upslope to lowest. <br />Cross Section 1 In the area of this crass section vegetation is well established on the sides and <br />on the bottom of the channel. Rock cobble on the bottom varies in size from 1" to 4" in diameter <br />but does not generally show through the vegetation. A profile of the area comparing different <br />years monitoring is listed as Cross-Section 1 in Appendix A. A review of the cross section <br />shows that this area has been very stable over time and has, in fact, improved since the original <br />spring 1992 measurement. <br />Crass Seetion 2 ThIs area shows vegetation on the side slopes and on the bottom of the channel. <br />Rock in the base area of the feature varies from 1 to 5 inches in diameter. Profiles are shown <br />in Cross Section 2 in Appendix A. This cross-section shows some improvement over last year, <br />and Is stable. <br />Cross Section 3 In the vicinity of this cross section vegetation is established on the side slopes <br />and at the bottom of the channel. Rock fragments in the channel bottom vary from 1 to 9 inches <br />in diameter and is providing good armoring. Vegetation in the flow area of this section was in <br />place and undamaged showing no further degradation. Cdlective data on this cross section is also <br />shown in Appendix A, Cross Section 3. This cross-section has also slightly improved and <br />appears stable. <br />Cross Section 4 This area is rxnk:eably steeper than the channel above and Is on the lower edge <br />of the bonded strip. Flow in the channel appears to be concentrating into a single deeper <br />channel. This area is the only measured section of the five that appears to have degraded slightly <br />over last years cross-section, which is indicative of the heavy run off experienced at the mine <br />this spring. Although the channel deepened slightly according to survey data, visual evidence at <br />the cross section does not show heavy erosion. In fact, the sides and bottom of the channel in this <br />area are better vegetated than in years past. <br />Crass Section 5 This cross section is located on bond released land and is beirg monitored only <br />to predict how this area might affect that of the bonded portion. In this vicinity vegetation is <br />present on the side slopes of the channel and some was noticed in the bottom. Rock size in the <br />8 <br />
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