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HomeMy WebLinkAbout05012008 BSC Agenda Item 3 • ~ Page 1 of 1 Josie Orosco From: Frank Griff in [fgriff in @ hal-pc.org] Sent: Wednesday, April 30, 2008 1:17 PM To: Josie Orosco Subject: Information for tomorrow Josie: I realize it's late, but it I wonder if the attached information could be made available for our meeting tomorrow? Hopefully some of the information may prove useful as reference when we look at how tree size affects canopy and replacement cost. I propose we consider a comparison of the financial impact of our revised rules against the existing rules. Hence I have included a plot of estimated replacement cost versus tree diameter, as per the current rules. This may require a little revision if I have not accurately reflected current rules. Finally, I have included a discussion item that relates to tree replacement requirement on a % canopy basis. I have not had the time to develop the estimated cost of compliance with such a rule, but it seems to me we that might be a next step. Thanks, Frank 04/30/2008 Percent Canopy as function of Tree and Lot Size Tree _ Removed Removed! 5500 12000 Diameter Canopy' ft2lot ft2lot Inches (ft 2) % Canopy ! % Canopy 1 3.1 0.1% 0.0% 2, 12.61 0.2% 0.1% _3 2837 0.5%11 4t 50.311 0.9%' 0.4% 578.5 1.4%i 0.7% 6' 113.1 2.1%10.9% 7, 153.9 2.8% _ 1.3% 811 201.1; 37/ 1.7% 9'i 254.5; 4.6%1 2.1% 101 314.2! 5.7%I 2.6% 11 i 380.1 1 6.9%'; 3.2% 12'' 452.4 8.2%I 3.8% 13' 530.9 9.7%1 4.4% 14' 615.8'1 11.2% 5.1% 15' 706.9 12.9% 5.9% 16'11 804.2 14.6% 6.7% 17 907.9 16.5% 7.6% 18 10174 18.5% 8.5% 19 1134.1 20.6% 9.5% 20 1256.6 22.8% 10.5% 21 1385.4, 25.2% 11.5% 221 1520.5 27.6%1 12.7% 23' 1661.9' 30.2% 13.8% 241809.6 32.9%! 15.1% 25 1963.51 35.7% 16.4% 26~ 2123.71 38.6% 17.7% 272290.2 41.6%i 19.1% 28 2463.0 44.8% 20.5% 291 2642.1 48.0%. 22.0% 30 2827.4 51.4%, 23.6% 0 - o LO rn 0 O LO Oo 0 co I LO i 0 ~ o co LO E 0 N E o C "Ot C a 0 M R o v M e _ N Q O O 0 N LO U ;o CL 00 U C: ~ U LO 1 ~ M I N i _ O LO O LO O LO O U-) O LO O 1:T It M M N N r Adoueo % leuid wnwiuiW M 0) CV 00 (V I } N \ N N N ce) \ N - N N i Cl 4) 0) t CO Q e- C (A Z lf) lC - - Q Cr) Q L Q 04 C ~ V ~ O i co CD L(7 I Co i` N r O O O O O O O CO co N V) V) C) LO N Z:1- eajb Adoueo Tree Canopy vs Trunk Size Trunk Canopy Canopy Diameter Radius Area (inches) (feet) (ft2) 1 1 3.1 2 2 12.6 _ 3 3 28.3 4 4 50.3 5 5 78.5 _ 6 6 113.1 7 7 153.9 8 8 201.1 9 9 254.5 10 10 314.2 11 11 380.1 12 12 452.4 13 13 530.9 14 14 615.8 15 15 706.9 16 16 804.2 17 17 907.9 18 18 1017.9 19 19 1134.1 20 20 1256.6 21 21 1385.4 22 22 1520.5 23 23 1661.9 24 24 1809.6 25 25 1963.5 26 26 2123.7 27 27 2290.2 _ 28 28 2463.0 29 29 2642.1 _ 30 30 28_2_7.4 31 31 3019.1 32 32 3217.0 33 33 3421.2 _ 34 34 3631.7 35 35 3848.4 36 36 4071.5 37 37 4300.8 38 38 4536.5 39 39 4778.4 40 40 5026.5 i ~ Estimated cost to replace trees - current rules Current Reauirement Trunk Replacement Diameter Cost (inches) _ _ 1 $ One 4" tree for every 10" diameter of trunk removed 2 $ - Assume that balance of trunk diameter replacement is done with 2 ' trees 4 $ - 5 $ - Cost Basis 6 $ 600 7 $ 800 2" tree $ 200 8 $ 800 4" tree $ 1,500 9 $ 1,000 6" tree $ 4,500 10 $ 2,100 min one 4" tree 11 $ 2,300 12 $ 2,300 Note: There is currently some minimum planting required for lot with _ 13 $ 2,600 major development 14 $ 2,600 15 $ 2,800 - - 16 $ 2,800 17 $ 3,000 18 $ 3,000 19 $ 3,200 20 $ 4,200 2 min 4" trees 21 $ _ 4,400 _ 22 $ 4,400 23 $ 4,600 24 $ 4,600 25 $ 4,800 26 $ 4,800 27 5,000 - - 28 $ 5,000 29 $ 5,200 30 $ 6,300 3 min 4" trees 0 M O N 00 N N O N LO N N M N N N r N O N N! 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