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~-------+------+---------------------------------------------------*-----~------~ ~bNo W98
DATE BY REVI SION AP PV DAT E ~D------m~~8~2~------~
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918 ELDORAD O LANE
LOU ISVILLE, COLO RADO 80027
PHO NE: 3 03.604 .1634
FAX: 303.604.16 7 4
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SITE SLOPE PLAN
GLENWOOD COMMERCIAL
STATE HIGHWAY 82
GARFIELD COUNTY , COLORADO
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SL 1
OF 2 SHEETS
RECEIVE D
MAY 0 2 2007
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9 18 ELDOR ADO LA NE
LOU ISV ILLE, CO LORAD O 8 0027
PHONE : 303 .604 .16 3 4
f AX : 303 .6 04.1674
Civil Engineers
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DA TE BY REVISION DATE AP PV DATE 1-::-----,,-:-::------t
D-1098.1
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DEBRIS PLAN NO TES:
1. DEBRIS FLOW AND ROCKFALL DESIGN PARAMETERS ARE FROM A REPORT BY HP GEOTE CH, DATED APR IL 4,
2002, SUBJECT: PROGRESS REPORT, DEBRIS FLOW AND ROCK FALL RISK STUDY FOR THE PROPOSED
SMITH PROPERTY WAREHOUSE/OFFICE PROJECT, GLENWOOD SPRINGS, COLORADO .
2 . ALL ASPECTS OF THE CONSTRUCT ION AND INSTALLATION OF MITIGATION MEASURES SHALL BE INSPEC TED
BY THE GEOTEHN ICAL ENGINEER AND GEOLOG IST, THE DESIGN ENGINEER, OR THE IR DESIGNA TED
REPRESENTATIVE.
.3 . MAXIMUM FILL SLOPES ARE 2:1 AND SHALL BE COMPACTED TO 95% OF THE STANDARD PROCTOR PER
AS TM D-698 WITH MOISTURE CONTENT WITH IN 2% OF OPT IMUM. CUT SLOPES ARE 1:1 AND SHOULD BE
COMPRISED OF NATIVE MATERIA LS. WHERE LARGE ROCKS OR BOULDERS PROTRUDE THROUGH THE CUT
SLOPE, THEY SHA LL BE REMOVED . HAND PLACEMENT OF SITE MATER IALS WITH COMPACTION AS LISTED
ABOVE SHALL FI LL VOIDS LEFT BY REMOVED BOULDERS . LARGE ROCKS OR BOULDERS ARE CONS IDERED
TO BE GREATER THAN 2' AVERAGE DIAMETER .
4 . INSTALL AN IMPERVIOUS FABRIC LINER IN THE POND IF REQUIRED BY THE GEOTECHN ICAL ENGINEER .
5. PROVIDE A 10' WIDE MAINTENANCE ACCESS ROAD UPHILL OF BUILD ING 4 AND INTO THE UPPER POND
FOR MAINTENANCE. THE ACCESS ROAD IS A PRIVATE FAC ILI TY FOR USE BY THE OWNERS OF THIS SITE
ON LY.
6. INSTALL CORRUGATED METAL PIPE CULVERTS WITH FLARED END SECTIONS WHERE SHOWN.
7 . THE ROCKFALL PROTECTION FENCE SHALL BE DESIGNED AND SPECIFIED BY AN EXPERIENCED COMPANY
WI TH A SUCCESSFUL HISTORY WITH THESE TYPES OF INSTALLATIONS. HORIZONTAL LIMITS ARE SHOWN ON
THIS PLAN AND DES IGN PARAMETERS FOR ROCK FALL PROTECTION ARE LI STED BELOW THE UPH ILL SIDE
OF BU ILDING 4 WILL BE DESIGNED TO WITHSTAND THE IMPACTS OF A BOULDER PER THE DESIGN
PARAMETERS, WITH A FACTOR OF SAFETY. NO OPENINGS ON THE UPHILL SIDE OF BU ILDING 4 ARE
PROPOSED WITHIN THE INFLUENCE ZONE OF THE ROCKFALL
8 . ALL DISTURBED SLOPES SHALL BE SEEDED AND/OR HAVE A FABR IC INSTA L LED AFTER COMPL ETION OF
GRADING . S LOPES AT 2 :1 OR FLATTER SHAL L BE FERTI LI ZED AND SEEDED WITH A SEED MIX COMPATIBLE
WITH THE NATIVE SOILS AND COMMONLY USED IN THE COUNTY . STEEPER SLOPES SHALL RECEIVE AN
EROSION BLANKET AND BE FERTILIZED AND SEEDED WITH A SIM ILAR MIX COMPATIB LE WITH THE STEEPER
SLOPES. THE FABRIC EROSION BLANKET SHOULD BE INS TALLED PER COT STANDARDS , INCLUDING
ANCHORAGE AND OVERLAP.
DEBRIS FLOW DESIGN PARAMETERS
BAS IN B4 BAS IN B5
DEBR IS 179 CY 4 ,861 CY
VOLUME (0 . 11 AC-FT) (.3 .0 1 AC-FT)
[TOTAL DEPOSIT ON FAN FROM POND TO END OF FAN]
FAN AREA 0.1 ac 1.4 ac (AREA OF FAN DN SITE]
AVG. DEPTH 0 .6' 0 .6 ' (TOTAL VOLUME OF DEBRIS OVER TOTAL FAN AREA, BASINS 84 TO 86]
VOLUME 95 .6 CY 1.355 CY (DISPLACED BY DEVELO PMENT WITHIN FAN AREA ON SI TE]
DISPLACED (0 .06 AC -FT) (0 .84 AC -FT)
VOLUME 1580 CY AT ELEVATION: 5925.2
PROVIDED (0.98 AC-FT)
THE VOLUME DISPLACED BY DEVELOPMENT IS REPLACED BY CAPTURING IN A PROPOSED
DETENTION/RETENTION AREA ABOVE BUILD ING 4 . THE REMAINING FLOW CONTINUES
DOWN FAN IN IT 'S HISTORIC LOCATION .
NOTE: FAN FOR BAS IN B6 DEPOSITS EAST OF THE SI TE.
DEBR IS FL OW PLAN LE GEND
BASIN BOUNDARY - - - -
ROCK FENCE
85
BASIN IDENTIFICATION (HP) ROCK FALL DESIGN PARAMETERS
DEBRIS FLOW PATH
DEBR IS
FLOW
DE BRIS FLOW SCHEMATI C
BASIN
B5
OVE RFLOW
TO HISTOR IC
BASIN
OVER F LOW
>-~TO HISTORIC
BASIN
THES E PLA NS WERE PRE PARED UN DER Iff SUPE RVI SION
AS PER TH E REQ UI REME NTS OF THE CITY OF GLENW OOD
SPRI NGS.
JAMES LEE BLANKENSH IP
REGISTE RED P RO FESS IONAL ENG INEER
STAlE OF COLO RAD O NO. 30736
DESIGN ROCKFALL BLOCK DIMENSIONS : .3.7 'x 4 .J 'x6 .J'
DESIGN ROCKFALL BLOCK VOLUM E: 100 CF
DESIGN ROCKFALL BLOCK UN IT WEIGHT: 165 PCF
DESIGN ROCKFALL BLOCK TOTAL WE IG HT: 8 . .3 TONS
MAXI MUM BOUNCE HEIGHT : 1 1 '
MAXIMUM TOTAL STRUCTURE HEIGHT: 14 '
ROCK
FA LL
ROCK FALL SCHEMATI C
ON-SITE
PONDS
ROCK
FEN CE
UPPER
BUILDING
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--::f? 1"~2 0'
2 0 0 20 40 -----SCALE CONTOUR INTERVAL • 2' FE ET
DEBRIS AND ROCK FALL MITIGATION PLAN
GLENWOOD COMMERCIAL CENTER
COLORADO HIGHWAY 82
SHEET
DFR 1
CITY OF GLENWOOD SPRINGS , COUNTY OF GARF I ELD, STATE OF COLORAOD OF 1 SHEETS
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GUT BANK FROM DEVeLOPMENT
OF AOJACEN f MINI·-STO.f?AGE SITE
CUT SANK FOH HISITORIC:--·-··--· W
DR!VEWil Y ON
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CUT BANK FOR ESfABUSHMEN I"
OF Hf5TORJC .ACCES::; ro lHJS SiTE
AND PROPER TlfS TO EAST
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.-·-cC:UT BANK f:'~RNAL
DRIVEWAY TO SITE
~--Cttf BANK FOR HISTORIC
DRIVEWAY ON SITE
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OF CH AN GE BETWEEN
SLOPES GREATER THAN 40% AND
LESS THAN 40%
AND LOWER UMITS or
OLD GLENWOOD DITCH
OISTRUR8ANCE AREA
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Color Ranqe Beq.
0.017
Ill 40017
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Range End Percent Arti'O
!7020935
39853. !2
10.00 810
/5000 !.9.0
I;.2;J5 fiNG AND HIS I OR(O GQ!:!J)J]1QNS 1illlJ:
THERE ARE SEVERAL ISOLATED :.OCATIONS W1IH!N IHE SITE THAT
DEPICT SLOPES GREATER THAN 40% BASED ON THE TOPOGRAPH'··
THESE LOCATIONS ARE I.OCAUZED DISTURBANCES OF THE ORIGINAL
SLOPE TO SUPPORT DRIVEWAYS AND RESIDENCES THA f WERE Blil!.f
ON THE SITE OVER THE YEARS. TH£ HISTORIC (RECOVERED)
SLOPES IN THESE AREAS iS LESS THAN 40% AND CONSISTENT W1 TH
/HE NATURAL GRAD[ OF THE Si TF UPHILL AND DOWNHILL OF nILS[
AREAS.
TOPOGRAPHY NOTE
TOPOGRAPHY FOR THIS SITE IS A 2' CONTOUR INTERVAL AND WAS
TAKEN FROM AERL~l MAP'0 1NG OF Tl·IE CITY OF GLENWOOD SPRINGS
AS UPOA TED WITH ADDITIONAL GROUND RUN DETAIL BY HCLSAN
SURVEYiNG.
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918 ELDORADO LAN£
LOUISVILl.£. COLORADO e0027
PHON£: 303.604.1634
FAX: 303.604.1674
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Ch!JCked Jt.B Checked Jl.B
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1------t----t------------------------------------+---+-----l Job No . 1098
DATE BY REVISION APPV DATE 0-1098.2
"'.1 .. ···~
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5 +00
918 ELDORADO LAN E
LOUISV I LLE , CO LO RADO 80027
PHON E: 303.60 4 .1634
FA X• 3 03.60 4 .16 7 4
Civil Engineers
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GRADELINE 3
SITE SLOPE PROFILES
GLENWOOD COMMERCIAL
STATE HIGHWAY 82
GARFIELD COUNTY, COLORADO
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SHEET
SL 2
OF 2 SHEETS