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HomeMy WebLinkAboutGrading Plans - 10/06/2025Ju n e 25 , 20 2 5 Ol d To w n De s i g n s , In c . 21 0 Ea s t Oa k St r e e t Su i t e C Fo r t Co l l i n s , Co l o r a d o 80 5 2 1 At t n : Ms . Ke i r a Ha r k i n CT L I T H O M P S O N IN C O R P O R A T E D Su b j e c t : Dr a i n a g e Me m o 41 2 We s t Mo u n t a i n Av e n u e Fo r t Co l l i n s , Co l o r a d o Pr o j e c t No . WY 0 2 2 9 3 . 0 0 0 - 5 0 0 De a r Ms . Ha r k i n , Ex i s t i n g Co n d i t i o n s : Th e ex i s t i n g lo t ha s a si n g l e - f a m i l y ho u s e on a cr a w l s p a c e / b a s e m e n t fo u n d a t i o n th a t fa c e s so u t h to w a r d s We s t Mo u n t a i n Av e n u e wi t h a de t a c h e d ga r a g e in th e no r t h e a s t co r n e r ad j a c e n t to th e al l e y . Th e ex i s t i n g fl a t w o r k co n s i s t s of a fr o n t an d we s t si d e si d e w a l k , ba c k pa t i o s an d dr i v e w a y . Th e to t a l ex i s t i n g im p e r v i o u s su r f a c e wa s ca l c u l a t e d at 44 9 3 sq u a r e fe e t . Th e ex i s t i n g gr a d i n g co n v e y s wa t e r on th e ea s t si d e fe n c e li n e to w a r d s th e no r t h to th e no r t h si d e sw a l e at ap p r o x i m a t e l y 0. 5 % to 2. 1 % sl o p e an d to th e so u t h to w a r d s We s t Mo u n t a i n Av e n u e at ap p r o x i m a t e l y 0. 5 % to 2. 8 % sl o p e . Th e we s t si d e dr a i n s to th e al l e y an d th e n to w a r d s th e no r t h at ap p r o x i m a t e l y 0. 2 % to 2. 7 % sl o p e an d to th e so u t h to w a r d s We s t Mo u n t a i n Av e n u e at ap p r o x i m a t e l y 0. 1 % to 1. 0 % sl o p e . Pr o p o s e d Co n d i t i o n s : Th e ex i s t i n g ho u s e wi l l re m a i n . Th e ol d ad d i t i o n on th e ba c k of th e ho u s e an d th e ol d ga r a g e wi l l be de m o l i s h e d an d a ne w ba s e m e n t ad d i t i o n an d ne w AD U wi l l be co n s t r u c t e d . Th e r e wi l l be a ne w co v e r e d de c k ad d e d as pa r t of th e ad d i t i o n . Th e to t a l pr o p o s e d im p e r v i o u s su r f a c e is ca l c u l a t e d at 46 5 9 sq u a r e fe e t . Th i s in c r e a s e s th e im p e r v i o u s su r f a c e ar e a by 16 6 sf or 1. 8 % . At t a c h e d is a dr a i n a g e pl a n th a t in c l u d e s dr a i n a g e ar o u n d th e ho u s e an d pr o p o s e d ad d i t i o n an d AD U . Th i s dr a i n a g e pl a n wi l l co n d u c t wa t e r aw a y fr o m th e ho u s e an d di r e c t th e dr a i n a g e wa t e r to We s t Mo u n t a i n Av e n u e an d to th e al l e y as it ha s hi s t o r i c a l l y fl o w e d . Th i s dr a i n a g e wi l l dr a i n ac r o s s th e tu r f an d la n d s c a p i n g to w a r d s th e ar e a s in d i c a t e d . We re c o m m e n d th a t th e ne w do w n s p o u t s be in s t a l l e d to di s c h a r g e dr a i n a g e wa t e r to We s t Mo u n t a i n Av e n u e an d al l e y . Th e dr a i n a g e re c o m m e n d a t i o n fo r th i s lo t wi l l ha v e ne g l i g i b l e im p a c t s on th e ad j a c e n t lo t s . 11 0 3 Ol d To w n La n e | Su i t e 20 1 B | Ch e y e n n e , Wy o m i n g 82 0 0 9 | Te l e p h o n e : 97 0 - 2 0 6 - 9 4 5 5 |w w w . c t l t . c o m PT LOTS 1, 2 & 3, BLK 51, FTC DESC: COM AT SW COR SD LOT 1, TH E 50 FT, N 140 FT, W 50 FT, S 140 FT TPOB; ALSO W 54 FT OF N 32.5 FT LOT 3 & W 54 FT OF S 10.5 FT LOT 4, BLK 51, FTC City of Fort Collins Approved Plans Approved by: Date: Dan Mogen 10/06/2025 Th a n k yo u fo r se l e c t i n g CT L | T H O M P S O N fo r yo u r en g i n e e r i n g ne e d s . Wh e n we ca n be of ad d i t i o n a l se r v i c e , pl e a s e co n t a c t th e un d e r s i g n e d . Ve r y tr u l y yo u r s , CT L | T H O M P S O N , IN O OR A D O LI C E N OM . KN U T S 38 1 0 8 06 / 2 5 / 2 5 Wy a t t M. Kn u t s o n , PE Vi c e Pr e s i d e n t | Re g i o n a l Ma n a g e r At t a c h m e n t : Pr o p o s e d Si t e Pl a n , Ex i s t i n g Si t e Pl a n , Ex i s t i n g Gr a d i n g Pl a n , an d Pr o p o s e d Dr a i n a g e Pl a n ALLEY S00*07'56"E 182.96 4 4 4 Ol d Ad d i t i o n Ex i s t i n g Po r c h N8 9 * 5 7 ' 2 5 W 49 . 9 6 WE S T MO U N T A I N AV E N U E S8 9 5 7 ' 1 0 " E 53 . 9 7 Ga r a g e S00*08'16"W 139.97' SO0*08'16"W 422.99' SC A L E : 1" = 2 0 ' EX I S T I N G SI T E PL A N FO R 41 2 WE S T MO U N T A I N AV E N U E LO T S 1, 2 & 3, BL O C K 51 . FO R T CO L L I N S FO R T CO L L I N S , CO L O R A D O OL D TO W N DE S I G N BU I L D JU N E , 20 2 5 AD O LI C E N K OR A 38 9 0 8 06 / 2 5 / 2 5 RE S S I O N A L EN G I ALLEY S00*07'56"E 182.96 Δ 16 ' - 0 27-020-6 V4 S8 9 * 5 7 ' 1 0 " E 53 . 9 7 8-よ Ne w AD U Ne w Co v e r e d De c k Ne w Ad d i t i o n Ex i s t i n g Po r c h N8 9 * 5 7 ' 2 5 " W 49 . 9 6 WE S T MO U N T A I N AV E N U E S00*08'16"W 139.97' 12 - 1 1 1 / 2 S00*08'16"W 42.99' Ex i s t i n g Lo t Ar e a = 93 1 4 SF Bu i l d i n g Ar e a = 23 5 0 SF Fl a t w o r k Ar e a = 21 4 3 SF Im p e r v i o u s Ar e a = 44 9 3 SF Im p e r v i o u s / L o t = 48 . 2 % Pr o p o s e d Lo t Ar e a = 93 1 4 SF Bu i l d i n g Ar e a = 31 6 8 SF Fl a t w o r k Ar e a = 14 9 1 SF Im p e r v i o u s Ar e a = 46 5 9 SF Im p e r v i o u s / L o t = 50 . 0 % In c r e a s e in Im p e r v i o u s Ar e a 16 6 SF (1 . 8 % ) SC A L E : 1" = 2 0 ' PR O P O S E D SI T E PL A N FO R 41 2 WE S T MO U N T A I N AV E N U E LO T S 1, 2 & 3, BL O C K 51 , FO R T CO L L I N S FO R T CO L L I N S , CO L O R A D O OL D TO W N DE S I G N BU I L D JU N E , 20 2 5 RA D O LI C E N OL L 38 1 0 8 66 / 2 5 / 2 8 OF E S S I O N A L EN G I N 0.0 0 1.0% 0.3 6 ' 1.0% -0. 0 4 ' 0.5 4 2.3% 70 Ο ALLEY 0.2% 2% 64 0 ' 38 0. 3 6 0.1% ९2 . ピっ ガ 0. FI N FL O O R = 3 . 6 7 ' Ex i s t i n g 0. 3 3 ' 0.2% A Po r c h 4 4 -0. 2 4 ' WE S T MO U N T A I N AV E N U E 01 0.2 8 ' 5 0.9 0 ' 8%1.0 1 ' -1. 0 9 ' 2.7% 1. 2 % 4 .22 A 2 1.1 2 0.7 3 1.1% 24 2. 9 % 0.5% SC A L E : 1" = 2 0 ' Ga r a g e 0.4 8 0.24 ' 2.1% EX I S T I N G GR A D I N G PL A N FO R 41 2 WE S T MO U N T A I N AV E N U E LO T S 1, 2 & 3, BL O C K 51 , FO R T CO L L I N S FO R T CO L L I N S , CO L O R A D O OL D TO W N DE S I G N BU I L D JU N E , 20 2 5 05%-0. 3 9 ' -0. 5 1 ' -1.2 5 ' OL O R A D O LI C E M 6 38 1 0 з 06 / 2 5 - / 7 5 ES S I O N A L EN 0.0 0 1.0% 36 0. 3 6 0% ALLEY 0.2%2%1.0% 64 0 ' 23 8 08 つ 4 Ex i s t i n g 0.1% 0.3 6 0.2% 6. 1 5 0. 0.3 3 ' 4 0 Po r c h WE S T MO U N T A I N AV E N U E -0. 2 4 ' -0 . 0 4 ' -0. 5 4 2.3% اه ف1 0 2 -1. 0 9 ' 2.7% م4 4. 2 9 Ne w Co v e r e d De c k 1. 2 % Ne w AD U FI N FL O O R = 0 . 6 8 ' 2.9 % 0.5% Ne w Ad d i t i o n FI N FL O O R = 3 . 6 7 ' 1.1 2 ' 0.7 3 ' 1.0 1 1.01 ' 5% 0.2 8 ' 0.9 0 ' 1.1% 0.4 8 0.2 42.1% SC A L E : 1" = 2 0 ' PR O P O S E D GR A D I N G PL A N FO R 41 2 WE S T MO U N T A I N AV E N U E LO T S 1, 2 & 3, BL O C K 51 , FO R T CO L L I N S FO R T CO L L I N S , CO L O R A D O OL D TO W N DE S I G N BU I L D JU N E , 20 2 5 65%-0. 3 9 ' -0. 5 1 ' -1.2 5 ' CR A D O LI C E N G FOL 38 1 0 8 NO F E S S I O N A L ENEN G I N PT LOTS 1, 2 & 3, BLK 51, FTC DESC: COM AT SW COR SD LOT 1, TH E 50 FT, N 140 FT, W 50 FT, S 140 FT TPOB; ALSO W 54 FT OF N 32.5 FT LOT 3 & W 54 FT OF S 10.5 FT LOT 4, BLK 51, FTC Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: Date: Dan Mogen 10/06/2025