2021-07-29_INSPECTION - M2001022

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To: Ms. Fancher-English Date:July 28, 2021 Page 4 used for slope calculations generally agree with the PLS Corporation survey. In Zone 20, the King Survey shows slightly steeper slopes than those based on the PLS Corporation survey. The information provided on the King Survey (McGill, 2021) is in PDF format with no vector information,and some of the images appeared to be at a skewed angle. This could account for some of the discrepancy between the surveys in that the section location we attempted to mimic could be off slightly. We ' Zone 25 in Sheet 2 shows a discrepancy between the surveys and interpretation methods. The strict interpretation of Rule 3.1.5(7) leads one to look at slopes from the point where water meets the bank (i.e., water's edge). To evaluate slopes above the water level, we ' examine the slope a horizontal distance of 15 feet from water's edge (i.e., 15 feet vertical to five feet horizontal is a 3V:1H slope). Likewise, a 2VAH slope for 10 feet below the water level results in a 20-foot evaluation zone. Figure 2 shows the evaluation of the slopes at King's indicated maximum. For 15 feet from water's edge,the existing ground is nearly flat above the water level, and for 20 feet from water's edge, the existing ground slope averages gentler than 2V:1H. It could be that when the King survey was completed, the ' water level was 0.5 to 1 foot higher as shown in Figure 3. Regardless if one examines the section as in Figure 2 or Figure 3, the slope is in compliance with Rule 3.1.5(7) for two reasons: Rule 3.1.5(7) Max Slopes King Survey 4.85H:1V 4800 - - - Z_ —— Surveyed Ground Slopes checked from Surface Water Surface/Water's (PLS 2021) Edge 20' from 15' from 4775 LA/ater's E do e Water's Edcle 0+00 0+60 Figure 2 Slope Evaluation at Kings Maximum Indicated Slope ' 20210727 Slope Evaluation_DRMS RTC SFE.docx T E L E S T O