Laserfiche WebLink
67/69/2608 16: 37 952-955-5071 BURNS EXCAUATING PAGE 10 <br /> G. DOWNSI�OPE BERM WIDTH � (Slope > 1°l0) <br /> 1. Slope: 4.0 If landslope is 1% or more, subtract rock layer width from <br /> adsorption width to vbtain minimum downslope berm toe: <br /> 20.0 ft minus 10.0 ft rock = 10.0 Fvot minimum adsorption area <br /> 2. Calculat� minimum mound size: <br /> a. Determine depth of c(ean sand at upsfope edge of rock layer: <br /> From Site Evaluatian step C1: 18.0 inches clean sand <br /> b, Add depth vf clean sand (2a) at upslope edge, plus 1 foot of rock plus 1 foot <br /> of caver to get mound height at upslope edge or rock layer. <br /> 98.0 in ! 12 = 1.50 feet + 1ft+ 1ft = 3.50 feet upsfop� height <br /> c, Enter table with landslope ta get uplsope berm multiplier of 3.45 <br /> d. Multiply berm multiplier 2c by upslope mound height 2b to get uplvpe berm width: <br /> 3.45 X 3.50 equals 12.1 feet upslope berm width <br /> e. Multiply rock layer width D2 by landslope to get drop in elevation: <br /> 10.00 feet X 4.0 %slope = 40.00 ! 100 = 0.40 feet <br /> f. Add depth of clean sand for slope difference 2e at downslope edge, to the <br /> mound height at the upslope edge of rock layer 2b to find downslope height: <br /> 3.50 feet + 0.40 feet = 3.90 feet downsfope height <br /> g. Enter table with landsfope and downslvpe bern► multiplier of : 4.76 <br /> h. Multiply berm multiplier by downslope mound height to get downslope berm width: <br /> 4.76 feet X 3.90 equals 18.6 feet downslope berm width <br /> i. Compare values of step G1 10.0 ft & G2h 15.6 ft <br /> The greater of the finro values 18.6 is the downslope berm width <br /> j. Total mound width is the sum of upslope berm width G2d, plus rock layer width <br /> D2, plus downslope berm width G2i: <br /> 12.1 feet + 10.0 feet + 18.6 feet - 40.6 ft wide <br /> k. Total mound length is the sum of uplsope bermwidth G2d, plus rock layer length <br /> D3, plus upslope berm width G2d: <br /> 12.1 feet + 74.7 feet + 12.1 feet � 98.9 ft long <br /> i. FINAL MOUND DIMENSIQN IS: 40.6 ft wide X 98.9 ft lon <br /> % SLOP� DOWNSIOPE MUITIPLIER UPSLOPE MULTIPLIER <br /> 3 TO 1 4 TO 1 3 TO 1 4 TO 1 <br /> 3.00 4.40 3.00 4.00 <br /> 1.0 3.09 4,17 2.91 3,65 <br /> 2.0 3_19 4.35 2_83 3.70 <br /> 3.0 3.30 4.54 2.75 3,57 <br /> 4,0 3.41 4,76 2.66 3.45 <br /> 5.0 3.53 5,00 2.61 3,33 <br /> 8.0 3.66 5,26 2.54 3.23 <br /> 7.0 3.60 5.56 2,46 3,12 <br /> 8.0 3.95 5.88 2.a2 3,03 <br /> 9.0 4.11 6.25 2,3f 2.94 <br /> �o.o �,29 6,67 2.31 2.es <br /> 11.0 4.48 7.14 2.26 2,78 <br /> 12.0 4.69 7.89 2.21 2,70 <br /> PAGE 5 OF 12 <br />