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HomeMy WebLinkAboutFile Documents.905 Chatfield Rd.0111.2018 (116).ARBK cO(/ CIVIL ENGINEERING .1* 1)� LAND SURVEYING HE idivr An Employee-Owned Company February 09, 2021 Hailey Guglielmo, P.E. Project Manager City of Aspen Engineering Department 201 N. Mill Street, Ste 203 Aspen, CO 81611 RE: Grading and Drainage Certificate Conditions for TCO Permit No. 0111.2018.ARBK, 905 Chatfield Road HCE Project No. 2171653.00 Dear Hailey: High Country Engineering, Inc. has been requested by G.F. Woods Construction to provide the as-built survey for the Grading and Drainage Certificate approval to be issued a Certificate of Occupancy (CO) for the project at 905 Chatfield Road. However, due to the site winter conditions, the grading and drainage of the site cannot be fully analyzed to assure the compliance of approved plans and the complete functionality of the final grading and drainage. It is our understanding that a Temporary Certificate of Occupancy (TCO) may be issued until the spring weather allows a more accurate survey and site grading and drainage to be fully verified. The contractor and owner have agreed to satisfy the conditions of this letter and the attached markup of the preliminary as-built survey, to obtain an approved Grading and Drainage Certificate prior to the TCO expiration date. The following items must be completed, verified and approved prior to the June 25, 2021: • Grade inlet rim elevations to provide adequate drainage with the final landscape grading. • All swales must drain as designed and provide adequate capacity for 100-year storm event. • Positive drainage away from building foundation with greater than or equal to the minimum slopes specified in the geotechnical report or as shown on plans. 1517 Blake Avenue,Suite 101 Glenwood Springs,CO 81601 Telephone(970)945-8676 Fax(970)945-2555 Hailey Guglielmo February 9, 2021 Page 2 • The bioretention pond grow media mix must verified to be at least 6 inches below the weir crest with final landscaping. • Verify outlet pipe elevations and level spreader functionality with final landscaping. • Verify all drainage paths drain to the WQCV vault or bioretention pond with final landscaping installed. • Verify bioretention pond overflows weir into swale and rip-rap once final landscaping has been installed. • Final landscape grading shall be surveyed for slopes and spot grading. • Section views of drainage infrastructure with storm capacities, gravel depths, grow media depths, and overflow paths with final landscaping. Storm pipes were installed by the general contractor with higher elevations, and in some instances lower slopes, than proposed. We have reviewed the installed drainage infrastructure and we believe there is no impact due to the change in elevations. The original design had conservatively sized drainage infrastructure to capture and convey the entire proposed drainage basins for the 100-year design event. We ran hydraulic calculations to reflect as-built conditions, and the drainage infrastructure will convey the 100-year design event as intended. A preliminary as-built with comments to indicate the tasks that need to be completed in the spring is attached. HCE has provided this document to address the City of Aspen engineering grading and drainage certification in the spring of 2021. Gathering accurate survey data for grades and drainage infrastructure during the months of heavy snowfall can provide information that will not reflect the final as-built conditions. The site will need to receive final landscaping for CO in the spring, so at this time the as-built survey will be updated and stamped by a professional land surveyor and engineer for City of Aspen approval. Please let me know if you have questions or comments. Feel free to contact me if you require any additional information. Sincerely, tO _tlic!%:;. v. / • siN 4.110 Roger D. Neal, P.E. afr;e iq Principal =• PRELIMINARY GRADING & DRAINAGE AS-BUILT m 905 CHATFIELD ROAD, ASPEN, COLORADO SITE 8 1 MORE PARTICULARLY DESCRIBED AS LOT 4,WEST ASPEN SUBDIVISION, FILING NO.3 A aSECTION 2,TOWNSHIP 1 SOUTH, RANGE 85 WEST OF THE 6TH P.M. �.,.� 0 �t COUNTY OF PITKIN, STATE OF COLORADO �04 OLORADORE /.. '...• . ,11, CAYOU DIGRE i .'- 1.' -*,* VEGETATED SWALE TO BE FINE •,. �..., 1 0] GRADED AND VERIFIED IN SPRING. VERIFY OVERFLOW FROM WEIR CREST FLOWS INTO SWALE TO RIP-RAP. :4'`<-. *� �!l�.+r�C FOUND#5 REBAR&YELLOW `a` , M♦r ......... awJ ll PLASTIC CAP LS38215 VIA �.�,Z+'Mi POND WEIR r� ♦.� Z TOP OF WALL ELE6:7819.90 CREST ELEV:7819.65 * �+ �N I^O��02 0 INSTALL FINAL RIP-RAP. VERIFY PIPE OUTLET #5 REBAR x ADJUST POND BOTTOM(GROW MEDIA MIL) E.AT LEAST 7" : �03��`*��,;''���� 5 BENT BELOW WEIR CREST FOR GROW CF OF VOLUME.REQ ELEV:7819.15. \ i ,I ©�.� \ ry o <10'UTILITY EASEMENT BIORETENTION POND pd 'ti' ^ y w N&BUILDING SETBACK - 1 RETAINING WALL 1 ;l, - - - _ -/ _\ \ VICINITY MAP _ 7I� _ PROPERTY LINE �sr r I- - SCALE: 1" =500' x `' c�� c \I SETBACK LINE VEGETATED SWALE TO BE FINE \ LI1 I r 1/ I GRADED AND VERIFIED IN SPRING. Q -a`(n� 444^^^VVV SHALL DRAIN TO BIO-POND PROPERTY DESCRIPTION ❑ ` II • LOT 4,NEST ASPEN SUBDIVISION,FILING MO.3,ACCORDING TO THE PLAT THEREOF RECORDED IN PLAT er\ BIORETENTION POND �I I \ BOOK 3 AT PAGE 309,PITKIN COUNTY,COLORADO. d UNDERDRAIN CLEANOUT AS-BUILT INLET Z RE BMGG GAS METER I A RIM:7828.69 INVERT:7825.94 NOTES: ` 1�1 ss c\ I \ 1. THIS IS A PRELIMINARY AS-BUILT SURVEY FOR A TEMPORARY CERTIFICATE OF OCCUPANCY Q 10'UTILITY EASEMENT de BUILDING SETBACK--� " \,C ONLY.LABELS IN RED TEXT INDICATE ITEMS TO BE COMPLETED IN THE SPRING OF 2021.A cV a �r §s ss ss ss y FINAL AS-BUILT SURVEY MUST BE COMPLETED AND APPROVED BY NE CITY OF ASPEN CO Z / F.F:7829.02 n ��,,. ENGINEERING PRIOR TO THE EXPIRATION DATE OF THE TEMPORARY CERTIFICATE OF 0 Y ❑ Q J _ F OCCUPANCY. 9 m W AS-BUILT GAS • ` y ,�, ST m C81. m \o AS-BUIIEE f� / SANITARY SEWER \-9L� 2. DATES OF FIELD SURVEY: JANUARY 19 AND 27,2021.FEBRUARY 3,2021. w F O. IT LIVING l!r -n I 3. LINEAR UNITS USED TO PERFORM THE FIELD MEASUREMENTS WERE U.S.SURVEY FEET. o 0 o I/ TERRACE ` ♦ I rn O� 1r 1,p �4 \ /��` 4 MEASUREMENTS FROM BUILDING SETBACK LINES TO BUILDING ARE TO FACE OF FlNIH U 1.4'-~e GARDEN 7 Z RI 1 I , AS-BUILT GAS O \ 5. ELEVATIONS SHOWN HEREON ARE BASED ON NORTH AMERICAN VERTICAL DATUM OF 1988 WITH ENTRY REFERENCD FROM NGS STATION 5159 HAVE AN ELEVATION OF 7720.88. U1 UNDERDRAINS TERRACE I VERIFY POSITIVE DRAINAGE F.F:7828.95 c / N D O to AWAY FROM BUILDING TO INLET I 8. PROPERTY CORNERS HOWN HEREON WERE USED FOR HORIZONTAL AND VERTICAL �} N WITH FINAL LANDSCAPING I I A. \ / CONTROL Z J//J VERIFY INLET LOCATION ��yy 'O N �r Ni I AND ADJUST GRADE Y ' 7. THE PURPOSE OF THIS SITE PLAN IS TO VERIFY AS-BUILT GRADING AND DRAINAGE M1. p N 071 LOW POINT ELEVATION ASPHALT FROM PREVIOUS ENTRY PATH CONDITIONS ONLY AND IS NOT TO BE CONSTRUED TO BE A LAND SURVEY PLAT OR AN 4 ARDEN UNDERDRAIN W 0D O 1 PROPERTY LINE Wl111 Q, CLEANOUT / REMOVED AND LANDSCAPED IMPROVEMENT SURVEY PLAT. W SETBACK LINE NDERE(R ., C 0 '\ I SO AS-BUILTJIIATER SERVICE W I'-O U aU 1� 8. UNDERGROUND UTILITIES ARE SHOWN HEREON ARE APPROXIMATE ONLY.AS-BUILT UTILTIES U)G" V ADJUST FINAL GRATE ELEVATION TO •EGETATED SWALES TO BE FINE' AS-BUILT WATER \S HAVE BEEN MARKED OUT BY OTHERS.UNDERGROUND UTILITIES MUST BE FIELD VERIFIED GRADED AND VERIFIED IN SURROUNDING LANDSCAPE ELEVATION AND SPRING TO BE CAPTURED BY I w CURB STOP w V t7 w / PRIOR TO CONSTRUCTION. ,n 0 to LL 0 VERIFY POSITIVE DRAINAGE TO INLET ` INLET `•7 Z 'Z INVERT:7825.79 ` PROPOSED BASIN 1 TO e} } n W CLEANOUT ,L \ift 1 10 SEMENZ WQCV/DETENTION VAULTS 9 PROPERTY HOWNSAND TDESCRB D HEREON TO DETERMINE:THIS SURVEYOR OF THE i. U ADJUST FINAL GRATE ELEVATION TO C/O T AS-BUILT INLET EP TYp.) A) OWNERSHIP OF THE TRACT OF LAND W d a co = SURROUNDING LANDSCAPE ELEVATION AND �'�ri!v1 C!a� '� RIM:7829.59 \ ( ` B) COMPANBIIJTY OF THIS DESCRIPTION WITH THOSE OF ADJOINERS w m aD VERIFY POSITIVE DRAINAGE TO INLET I INVERT:7825.49 C) RIGHYS-OF WAY,EASEMENTS AND ENCUMBRANCES OF RECORD AFFECTING THIS NY 0 N INVERT:7824.32 IF R SIDENCE \ ` r_ PARCEL. W d O a VERIFY OUTLET PIPES AND €1 \ BUILDING J O LEVEL SPREADER ARE ' ./ 1 AS-BUILT SEWER \ 255ET:P 10. THIS SURVEY WAS PREPARED WITHOUT THE BENEFIT OF A CURRENT TITLE ~ ,-I 3 O ADJUSTED TO FINAL ! CLEANOUT N n �i� • AS-BU T SLOPE:0.3-- INSURANCE COMMITMENT.TITLE INFORMATION REFERENCED HEREON IS THE RESULTZZ N LANDSCAPE GRADE u . SWING TIES(TYPO) ,r\ CALCULATED CAPACITY OR 8"PIPE IS APPROX.4 CFS WITH ELEVATION AD OF RESEARCH BY THIS SURVEYOR AND IS NOT NECESSARILY COMPLETE OR "') N Izl.. VEGETATED SWALE TO BE FINE ro 'rn_ ; FOR LOCATING VAULT CONCLUSIVE. ../ ...-I W GRADED AND VERIFIED IN SPRING. I N �.�11k ACCESS LIDS Lc O V' Z SHALL DRAIN TO INLET ti i\ 11. ANY PERSON WHO KNOWINGLY REMOVES,ALTERS OR DEFACES ANY PUBLIC LAND 0 1` SURVEY MONUMENT OR LAND BOUNDARY MONUMENT OR ACCESSORY COMMITS A U I Ie� _ I ` �_ 25.6' AI 1 •"TRENCH(11(AIN '" CLASS TWO(2)MISDEMEANOR PURSUANT TO SECTION 18-4-508 OF THE a ����� \\ GRATE:7830.3 - -VOLUME CAPACITY:1503 CF V� COLORADO REVISED STATUTES.(S)4"PVC INV.IN:7822.9 FLOWLINE:783.00 'n(W)8"PVC INV.OUT:7822.8 \ TRENCH DRAN TRIBUTARY A' A APPROX.19.6%OF 12. THE CLIENT DID NOT REQUEST ADDITIONAL EASEMENTS,RIGHYS OF WAY ORVASTER PROPOSED B SIN USED IN D •IGN CALCULATIONS.(N)8"PVC INV.OUT:7822.8 I \ IMPROVEMENTS BE RESEARCHED OR SHOWN ON THIS PLAT.ERRACE I LI FULL BASINOWRATE=1.01 S 2 IS1 TRIBUTARY BASIN FLOWRATE=( 96 X 1.01)=0.20 CFS 13. THE WORD"CERTIFY"AS SHOWN AND USED HEREON MEANS AN EXPRESSION OF GARAGE \ FLOW DEPTH APROX.2"AT 0.'9%SLOPE PROPOSED BASIN 1 SUB-BASIN PROFESSIONAL OPINION REGARDING THE FACTS OF THE SURVEY,AS BASED UPON - � LOCATE USING PROVIDED SWING TIES 1 DRIVEWAY FOR TRENCH DRAIN CPACITY ,CR FOR ANNUAL INSPECTION 1 I T.O.S:7830.42 'd \ 6"TRENCH D AIN THE EVIDENCE PRESENTED HEREON,AND DOES NOT CONSTITUTE A WARRANTY OR < ti ff$$ CALCULATIONS 2 / .� \ ORATE:7830.3$ GUARANTEE,EXPRESSED OR IMPLIED. O _ W 1y. STEPS 1 FLOWLINE:782.85 APPROX.CABLE /J\ W AS-BUILT INLET1100111 LOCATION PER 14. NOTICE: ACCORDING TO COLORADO LAW YOU MUST COMMENCE ANY LEGAL ACTION l) W RIM:7824.48 I AS-BUILT INLET / \ \ CONTRACTOR BASED ON ANY DEFECT IN THIS SURVEY WITHIN THREE YEARS AFTER YOU FIRST Z 0 _ A DISCOVER SUCH DEFECT.IN NO EVENT,MAY ANY ACTION BASED ON ANY DEFECT S' " -L INVERT:7823.19 RIM:7824.97 ant E �' IN THIS SURVEY BE COMMENCED MORE THAN TEN YEARS FROM THE DATE OF 07 t,G INVERT:7823.27 ADJUST FINAL PIPE GRADE TO / V.3' \ H FINAL LANDSCAPE GRADE.LAMBS \ CERTIFICATION SHOWN HEREON. �' LEGEND TONGUE AND RAIN CHAIN TO � AS-BUILT ELECTRIC VOLUME CAPACITY:13O3 CF I� DRAIN THROUGH ROCK TO DRAIN �� i•3 \ \ 15. NOTICE: THIS PLAT AND THE INFORMATION SHOWN HEREON MAY NOT BE USED (5)8"HDPE INV.IN:7822.9 L PIPE OR INSTALL INLET \ \ FOR ANY ADDITIONAL OR EXTENDED PURPOSE BEYOND THAT FOR WHICH IT WAS W (S)8"HDPE INV.IN:7822.4 T- -- - __ --... \ INTENDED AND MAY NOT BE USED BY ANY PARTIES OTHER THAN THOSE TO (9 S (W)8"HDPE INV.IN:7822.9 \ WHICH IT IS CERTIFIED.THIS DOCUMENT AND THE WORK IT REPRESENTS IS THE ,Q �•0WATER SHUTOFF (N)4"PVC INV.OUT:7823.0 10'UTILITY EASEMENT&BUILDING \ us PROPERTY OF HIGH COUNTRY ENGINEERING,INC.NO PART OF THIS DOCUMENT SETBACK MAY BE STORED,REPRODUCED,DISTRIBUTED OR USED TO PREPARE DERIVATIVE 0 Z © BENCHMARK PRODUCTS WITHOUT PRIOR WRITTEN PERMISSION.AN ORIGINAL SEAL AND ORIGINAL ASPHALT OM PREVIOUS DRIVEWAY 0 GAS METER ELEV:7822.7T k. I REMOVED A D LANDSCAPE. SIGNATURE IS REQUIRED TO VALIDATE THIS DOCUMENT AND IS EXCLUSIVE TO HIGH Z #5 REBAR ` ` ` ' COUNTRY ENGINEERING,INC.AND THE OWNER(S)OF RECORD AS OF THIS DATE, O CO SEWER CLEANOUT WITH YELLOW PLASTIC CAP �� OF THE PROPERTY DELINEATED HEREON AND THE SUBJECT OF THE SURVEY. U CI IX CI O 0 ILLEGIBLE RETAINING WALLes ELECTRICAL METER AS-BUILT INLET: r ` i` / D 0 0 a RIM:UILTI 9.60 17 AS-BUILT INLET INVERT:7824.94 j ❑(�WALL IN SETBACKSETBACK LINE Z J DRAIN PIPE CLEANOUT W - C/0 APPROX.1.5 FEET HIGH IABS-BUAILTA KSUREVENYD RCSENRETIRFEIICSARTEIOAN DST LIAR TYEOMEHENRT LL Z CI W U) PROPERTY BOUNDARY LINE AS-BUILT INLET #5 REBAR �\ U)d' 0„ Ir H CERTIFY TO RIM:7830.48 THE OWNERS BOFERECORD UAS EOF I THIS DDATE THAT DTHE NELEVA ELEVATIONS,GRADINEBG AND DRAINAGE 0I U) 0 J -CTV CT/ CTV- CTV LINE INVERT:7825.33 FEATURES OF THE PROPERTY DESCRIBED AS 905 CHATFIELD ROAD WERE DEVELOPED FROM O U IJ 'ADJUST FINAL LANDSCAPE GRADE OF 0 El '"m E E E ELECTRIC UNE INLET TO DESIGN ELEVATION(7830.31) PROPERTY UNE s SURVEYING THE PROPERTY ON THE DATES OF JANUARY 19,2021,JANUARY 27,2021 AND FEBRUARY 3,2021 AND ACCURATELY DEPICTS THE ELEVATIONS EXISTING DURING THE >O IL SURVEY.THE ELEVATIONS MAY CHANGE SUBSEQUENT TO THE SURVEY DUE TO SUBSIDENCE, ?D <W c c c GAS SERVICE LINE GRADING&DRAINAGE CERTIFICATE I,THE UNDERSIGNED REGISTERED PROFESSIONAL ENGINEER,CERTIFY THAT UPHEAVAL,EROSION,ACTS OF MAN OR OTHER FACTORS.THEREFORE,THIS CERTIFICATE MAY O Z'Q NOT ACCURATELY DEPICT ELEVATIONS,GRADING AND DRAINAGE PATTERN AFTER THE DATE ss Ss SS SEWER SERVICE LINE HAVE OF THE SURVEY.EASEMENTS ARE SHOWN PER THE PLAT UNLESS NOTED OTHERWISE.NO U' _ INSPECTED THE AS-BUILT SURVEY DATA FOR PROJECT SITE: 905 CHATFIELD ROAD AND PART OF THIS LOT LIES WITHIN THE 100 YEAR FLOODPLAIN AS DEFINED BY FEMA,EXCEPT w w w WATER SERVICE LINE HAVE CONCLUDED THAT THE PROPERTY WILL DRAIN ADEQUATELY IN CONFORMANCE WITH AS NOTED. U ..I THE DRAINAGE PLAN SUBMITTED AND APPROVED BY THE CITY ON W ST AS-BUILT STORM PIPE - DO �3X\ Reviewed by Engineering ..1"0, -f;tI CY ST STORM PIPE(ASSUMED LOCATION) ozmnor.,,soT AM s� ��� '9�;"O ff1 0. >-... DESIGN SWALE relieve theappl am that gas responb shall }- / j �m 23 P'�/i complyI review n rameosalby the City of "• �� / t�1" / GRAPHIC SCALE Aspen.Therevy t and the City Is ;,,,Ill •„ i offered only to assist me applicant's ��.� {Ju+� ,i�, /� � PROJECT NO. 10 0 5 10 20 ,p understanding thee Engineering '"fit n / y~ ,11'� - requremen perm .5 d/s/ � t\1'�°kii uaAo 2171653.00 d n,other uinnshell W �/,.," not prevent theCity f Aspen irom requiring the 4y� 11 correction 0(errors do the construction 3im',.4w:a� annnmem:ana nmer aata. BILLATE: W.A.BAKER,COLORADO PLO#23875 1 inch-10)tG BY: ROGER D.NEAL DATE: FFOR AND BEHALF OF: HIGH COUNTRY ENGINEERING,INC. 1 PE LICENSE NO.29975