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Home My WebLink AboutLot Certifications - 03/19/2012ADVANCED ENGINEERING STRUCTURAL DRAINAGE June 19, 2012 Mr. Dwight Sailer HighCraft Builders 429 S. Howes Street Ft. Collins, CO 80521 RE: 122 S. Whitcomb Street, Ft. Collins, Colorado Advanced Engineering, LLC Project Number 1011-103-01D.1 Dear Mr. Sailer: LLC DRAFTING �� yam- �7/.rl .7G �. •�� 'T 6;1? )20IO31O Released 51-K t4/ F# Per your request, our office has evaluated existing drainage conditions at the above referenced site, as they relate to the proposed construction of anew single family residence and detached garage. An existing residence and detached garage have been removed from the site. Historically the site and most of the surrounding properties have been subject to extremely poor drainage, including flooding in many areas. The north and south property lines are fenced and the neighboring properties are landscaped. The site is generally very flat with a slight fall to the south and west. There is a slightly lower section of the site, approximately 70 ft. from the alley, which appears to receive significant off site flow from the neighboring properties to the north. This off site flow, as well as flow from much of this site, generally flows to the southeast and southwest through the neighboring property to the south. We have met with you and City of Ft. Collins drainage officials to discussed the complex drainage needs and concerns at this site. Based on these meetings and the above noted site conditions we have prepared a Drainage Plan for the site, Project Number 1011-103-01 D, dated June 19, 2012. The goals ofthis drainage plan were to provide positive drainage around the residence, strive for minimal impact on existing landscaping and fencing at the adjacent sites, not to impede existing off site flow from the north, not to increase flow onto the neighboring property to the south, and to generally align the front porch height with the adjacent homes. While there are many possible options to achieve some of these goals, others are near impossible within reasonable budgetary limits. We feel the above referenced Drainage Plan provides a reasonable solution that best fits all of these goals and existing site conditions. However, due to inherent limitations of the site, portions of the site will be subject to flooding depending on intensity/duration of precipitation events. The flooded area will be between the residence and the garage, and will slowly drain to the southeast around the garage to the alley. The flooding will be a sufficient distance from the residence that it should not impact the foundation or underlying soils (we have consulted with the geotechnical engineer). In spite of the potential flooding, this site will have greatly improved drainage around the residence as compared to previous conditions and neighboring properties. We feel it is important that you and the owner understand the limitations of the site and the Drainage Plan, as well as the need to maintain drainage at the site in accordance with the Drainage Plan when grading/landscaping are performed and in the future. Please sign below to acknowledge your understanding and acceptance of these conditions and any possible associated negative ramifications. The owner should disclose these conditions to any future buyers of the property. YCo4 ntractor Date 9 33739 O er ate Vr'- -'4 Sincerely, Advanced Engineering, Jason E. Baker, P.E. �S/llnln� _Ire President 146 Barberry Place, LovelaN�'t--80o d 80537 Telephone 970-278-1909 Fax 970-278-1910 LEGEND: x ELEV. z EXISTING GRADE ELEVATION x ELEV. = PROPOSED GRADE ELVEVATION BOCdG = BACK OF CURB d GUTTER BOW = BACK OF SIDEWALK FF FINISH FLOOR ELEVATION FG = FINISH GRADE ELEV. AT FOUNDATION FL = FLOW LINE ELEV. OF CONCRETE PAN HP = HIGH POINT/GRADE BREAK ELEV. T5M-1 = TEMPORARY BENCH MARK TOF = TOP OF FOUNDATION WALL TOS = TOP OF SLAB ELEVATION TOW = TOP OF WALL ELEVATION SEE ADVANCED ENGINEERING, LLG DRAINAGE LETTER DATED (o/19/12 FF = 102.8 FL 100.3 100.E 100.15 01. OC d OW 10 C� ____xL__ 99.6 100.65 xcl FL .� 111A \O F 7.2 0 O STEPS N CV $ $ 100.43 9 �a10 z FL Iqo BM - I 44/100.2 100.0 - _X 100.2 100.1 OW TOUT MAX. FG 101,14 TYP a HOUSE 101.64 FL HP/FL 3. 100:1 100.1 PAN o 0.5io 101.0 ......... ... L--___ _. _ - _ wiDaoE EEn � TOP 103.14 6° STEP FF 103.33 UP FF ■ IS' 101.83 ■ TOF 101.64 2 -OR 3000 PSI CONCRETE W1 ro% AIR, TYPE II 3-04 BARS CONTINUOUS AS SHOUIN, GRADE 60 CONCRETE PAN SECTION N.T.S. EXIST. OFF SITE MIN. 2% FLOW SLOPE TYP. o HOUSE S gb• WoO°E - 190.00, 100.6�1_00.5 0A1% Iroro. I 100.6"� 29c ll / 0.5% STEP 101.83 100.E r STEPS 101.11 MAX. FG 100.E TYP. c GARAGE j BEFOIR YOU DIG STOF CALL UTILITY NOTIFICATION CENTER aF COLORADO all 'IT'S THE Ld ' r -�0.4% i ° L TOF I _ - 16,2 '- °I TO$ 100.6 0,38io 100.45 x x - :�ONC. PAN e 0.5% FL 100.2 100.3 i / HP 100. 100.5 10015 N 90.00' OPw 190.w PF = 1022 D FA f NAME FLAN �®sae��.�T 19-909M.9fal 6' WIDE CONCRETE CURB OR STONE WALL, TOW 100.8 OR HIGHER, TYPICAL AT SOUTH PROPERTY LINE A$ SHOWN (DRAINAGE BOUNDRY) C w Q C] " Z m JEm N d JMa U � rc W a rn_ UW o°a Z < zDm _z L7- RWo So� ■ N w O . W > w 5= a Za p� W _c Q rn u ] F U W ■ s ] m Qz WCEa m- PRO.IR NUMBER: 1011-103-01D DATE: 6/19/12 POAI.E: I•=10' CPH JEB PNERP NUMBER: I OP I ADVANCED ENGINEERING, LLC STRUCTURAL DRAINAGE DRAFTING June 19, 2012 Mr. Dwight Sailer HighCraft Builders 429 S. Howes Street Ft. Collins, CO 80521 r7/ RE: 122 S. Whitcomb Street, Ft. Collins, Colorado / S� Advanced Engineering, LLC Project Number 101 1-103-01D. 1 Dear Mr. Sailer: �1 Per your request, our office has evaluated existing drainage conditions at the above referenced site, as they relate to the proposed construction of a new single family residence and detached garage. An existing residence and detached garage have been removed from the site. Historically the site and most ofthe surrounding properties have been subject to extremely poor drainage, including flooding in many areas. The north and south property limes are fenced and the neighboring properties are landscaped. The site is generally very flat with a slight fall to the south and west. There is a slightly lower section of the site, approximately 70 ft. from the alley, which appears to receive significant off site flow from the neighboring properties to the north. This off site flow, as well as flow from much of this site, generally flows to the southeast and southwest through the neighboring property to the south We have met with you and City of Ft. Collins drainage officials to discussed the complex drainage needs and concerns at this site. Based on these meetings and the above noted site conditions we have prepared aDrainage Plan for the site; Project Number 10 11- 103 -0 ID, dated June 19,2012. The goals ofthis drainage plan were to provide positive drainage around the residence, strive for minimal impact on existing landscaping and fencing at the adjacent sites, not to impede existing off site flow from the north, not to increase flow onto the neighboring property to the south, and to generally align the front porch height with the adjacent homes. While there are many possible options to achieve some of these goals, others are near impossible within reasonable budgetary limits. We feel the above referenced Drainage Plan provides a reasonable solution that best fits all of these goals and existing site conditions. However, due to inherent limitations of the site, portions of the site will be subject to flooding depending on intensity/duration of precipitation events. The flooded area will be between the residence and the garage, and will slowly drain to the southeast around the garage to the alley. The flooding will be a sufficient distance from the residence that it should not impact the foundation or underlying soils (we have consulted with the geotechnical engineer). In spite of the potential flooding, this site will have greatly improved drainage around the residence as compared to previous conditions and neighboring properties. We feel it is important that you and the owner understand the limitations of the site and the Drainage Plan, as well as the need to maintain drainage at the site in accordance with the Drainage Plan when grading/landscaping are performed and in the future. Please sign below to acknowledge your understanding and acceptance of these conditions and any possible associated ne ative ramificati buyers of the property. qo0 REG�S ' Sincerely, .••' v' Advanced Engineering, 33739 Jason E. Baker, P.E.'•�P-19-�?%�� President `rS/ONALEN The owner should disclose these conditions to any future Contractor Owner Date Date 146 Barberry Place, Loveo 80537 Telephone 970-278-1909 Fax 970-278-1910 ®r [py 122 SOUTH tD r . WHITCOMB i 1✓ NWWWE B I 1f1 e r as �\ . 50oa,\0 ' o (P J A. -7 io (gyp awww w ALLEY ww x 0 M \° D m 0� Z)> I b s 6 I u mD r p Czi mm Iv isE. o mom ' Z A 13) Q P ° DZ l' IU a -Im Mm 6 z I Lor / 1 N I n � OL C m��, U I mcn3 =rp? . I OmN Nmae I R m� � JA It A $ 0 Im � U rX _ Bx it I 716, t (P 01j m HkCaHCRAFT BUILDERS w 0] 122 SOUTH WHITCOHB STREET, FORT COLLINS, COLOR.4D0 E C OS BE g 7/ � /- /1 + -+ L m TI m x r E 0 3 "D r' -" O O x r rm- m _ m m Z L i :z < < UZ A U A m L E N= D r i AO n g D� P m A w g N 6 Illr Ul u A�< In m o p r- � D@ m Dmm8mA GAAS < D ZZ Z m 0 D._D T W D m D E L p -� O. G� m m D z Z r- O p D A -i mm < .m m p A m D <.D D D OZ Z� o IN ADVANCED ENGINEERING, LLC STRUCTURAL DRAINAGE DRAFTING 146 9.w[[[[ Vucc. Lw6u 0. Coto ac 00537