HomeMy WebLinkAboutSite Certifications - 01/08/2009I
NTE RWEST C O N S U'LT I N G GROUP
November 18, 2008
Mr. Jay Barber
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, Colorado
RE: Drainage, Certification
HiddenrPond Subdivision
DearJay:
Please accept this letter and the attached drawings and calculations as the Drainage Certification for
the above project. Based on surveys provided by King Surveyors Inc. in October and November,
2008, and site visits by Interwest staff; the project drains in substantial conformance with the
approved plans and drainage report. The swales, storm pipes, culverts, and outlet structures have
been checked and have been built in substantial conformance with the approved plans. The volume
of Pond C is in substantial conformance with the approved plans as are both Pond B and Pond C
spillways. The contractor has stated that all riprap was installed per plan and buried.
The attached record drawings show the as -built information for the project. As was discussed during
the original design, each lot will be required to prepare a grading plan at time of building permit.
The record spot elevations shown on the record grading plans will be used as the base map for each
home's building permit. With each grading plan for building permit, modifications to the finished
floor elevations and minimum opening may be made (based on actual conditions). All drainage
patterns will remain as originally approved. Minor, lot line swales will be incorporated into the
grading of the individual homes.
Please review this information and give me a call if you have any questions.
Sincerely,
Michael Oberlander, P.E. °9 '•.•���($(0,���
Project Manager 0��ss/oe!pa.�'�G'
1218 W. ASH, STE. C, WINDSOR, COLORADO 80550
TEL. 970.674.3300 - FAX 970.674.3303
_6 ll1.*7
January 7, 2008
Mr. Jay Barber
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, Colorado
INTERWEBT C O N S U L T I N G G R O U P
RE: Hidden Pond Subdivision Pond Outlet Structures
Dear Jay:
During your review of the drainage certification submitted on November 18, 2008, you called to my
attention that the approved plans for Hidden Pond showed a different trash rack on the outlet
structures than the City's current standard detail. The trash racks on the two ponds were constructed
per the details on the approved plans. This detail was taken from Denver's Urban Drainage
Standards and has larger openings than the City of Fort Collins detail.
Both of these ponds have been constructed to the correct volume and both spillways were
constricted per plan. In the event that there is clogging of the outlet structure, we anticipate that the
spillways would function as designed.
From a safety standpoint (protecting the inlet from unwanted entry), the distance between the bars is
the same width as on any Type R inlet (which can be encountered throughout town on streets and in
parking lots). The grates are not intended to be walked on or driven over.
We do not feel that reconstructing the trash racks is necessary since the ponds and spillways
constructed per plan. We also want to note that modifying the trash racks to the City's standard
would not totally remove the chance of the outlet structure clogging.
Please call if you have any questions. It is my understanding that with the submittal of this letter, the
site will be considered compete from a drainage standpoint and that building permit applications can
be submitted.
Sincerely,
Michael Oberlander, P.E.
Project Manager
Cc: Colorado Custom Homes
1218 WEST ASH, SUITE C WINDSOR, COLORADO $0550
TEL. 970.674.3300 • FAX. 970.674.3303
RECORD Detention Pond - Stage/Storage
LOCATION: Hidden Pond Estates - Pond C - Detention .
PROJECT NO: 1055-039-00 .
COMPUTATIONS BY: MPO
DATE: 11/18/2008
V = 1 /3 d (A + B + sgrt(A*B))
where V = volume between contours, fe
d = depth between contours, ft
A = surface area of contour
WATER QUALITY READ: 0.06 (Ac-Ft)
DETENTION REGD:. 0.49 (Ac-Ft)
TOTAL READ: ' 0.55 (Ac-Ft)
.Stage
(Elev)
Surface
Area
(Ft^2).
Incremental
Storage .
(Ac-ft)
Detention
Storage
(Ac-ft)
Total
Storage
(Ac-ft)
4881.1
0
4882.0
603
0.00
0.00
4883.0
4437
0.05
0.00
0.06
4884.0
9122
0:15.
0.15
0.21
4885.0
14372-.:
0.27
0.42
0.48
4885.Z
16673
0.07
049
0.55
4885.4
17440
0.08
0.57
0.62
. 4886.0 ,
22042
0.27
0.84
0.90
January 7, 2008
Mr. Jay Barber
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, Colorado
Zia
INTERWEST I CONSULTING G R O U P
RE: Hidden Pond Subdivision Pond Outlet Structures
Dear Jay:
During your review of the drainage certification submitted on November 18, 2008, you called to my
attention that the approved plans for Hidden Pond showed a different trash rack on the outlet
structures than the City's current standard detail. The trash racks on the two ponds were constructed
per the details on the approved plans. This detail was taken from Denver's Urban Drainage
Standards and has larger openings than the City of Fort Collins detail.
Both of these ponds have been constructed to the correct volume and both spillways were
constn c-fed'pei plan. In the event that there is clogging of the outlet structure, we anticipate that the
s.pillways.would"function as designed.
From a safety standpoint (protecting the inlet from unwanted entry), the distance between the bars is
the same width as on any Type R inlet (which can be encountered throughout town on streets and in
parking lots). The grates are not intended to be walked on or driven over.
We do not feel that reconstructing the trash racks is necessary since the ponds and spillways
constructed per plan. We also want to note that modifying the trash racks to the City's standard
would not totally remove the chance of the outlet structure clogging.
Please call if you have any questions. It is my understanding that with the submittal of this letter, the
site will be considered compete from a drainage standpoint and that building permit applications can
be submitted.
Sincerely,
Michael•Ober'landei,•`P:E:
Prod ect`Manager
Cc: Colorado Custom Homes
1218 WEST ASH, SUITE C *WINDSOR,, COLORADO-80550^ „ -
TEL 970'. 674.3300 • FAX. 970.674.3303
NOTES
1. ALL WATER MAINSSHALL BEG" DUCTILE IRON PIPE(CLASS52),POLYWRAPPED OR C900PVCCL150WITHTRACERWIREANDLO TORSTATIONS/W/
APPROVAL OF THE CITY AND PFN AS SPECIFIED SYCITY OF FORTCOLLINS STANDARDS. MAINTAIN 5.0' DEPTH FROM RNISHEDGRADETOTOP OF
WATERLINES (DEPTH IS SPECIFIED TO PROVIDECLEARANCE FROM PRIVATE FORCEMAIW.
2. ALL WATER SERVICE SWILL BE;" TYPE K SOFTCOPPER WITH EXTERIOR METER RTS. OEFIECT WATER SERVICES UNDER ROADSIDE DITCHES AS
REQUIRED TO MAINTAIN 5.0' OFCOVER.
3. NEW HOMES WITHIN THE SUBDIVISION (LOTS 2 THROUGH 14) WILL BE REQUIREDTO HAVE RRESPRINKLER SYSTEMS. THESE SYSTEMS WILLBE DESIGNED
WITH THE BUILDING PERMIT FOR EACH BUILDING.
4. SANITARY SERVICE TOTHIS SUBDNISION WILLBE PROVIDED BY MEANSOFA PRIVATE LOW PRESSURE SEWER SYSTEM. EACH LOT WILLBE REOUIREDTO
INSTALLAN TONE -GP 2010,93" GRINDER PUMP NEAR THE BUILDING SITE ATT ETIMEOF BUILDING CONSTRUCIONOUHICH WILLCONNECTTOTHE 1+'
HDPE SERVICETO EACH LOT. THE HERE PIPE AND FITTING SPECIFICATIONS ARE INCLUDED IN THE DETAIL5HEETS OFTHIS PLAN SET. ALLCONNECIIONS
WILL BE MADE WITH BUTT FUSION METHOD. THE 1}" SERVICES END ON EACH LOTATA NORDSTROM POLY -WATER BALLVALVE IN A VALVE BOX. ATTHE
TIME OF BUILDING CONSTRUCTION. A CHECK VALVE SHALL BE INSTALLED PRIORTO EXTENDING THE 1*' HOPE OR PVC SERVICETOTHE RUMP.
THE 2" FORCEMAIN IN THE PRIVATE DRIVE WILL BE COMMONLYOWNEDAND MAINTAINED BYTHE HOMEOWNER'SASACIATOM THE1+"SERVICESAND
TEES TOTHE MAIN AS WELL AS THE PUMP STATIONS WILL BE OWNED AND MAINTAINED BYTHE INOIVIDUALLOTOWNERS.
THE FORCEMAIN SHALL BE INSTALLED E5' BELOW FINISHED GRADEAND MAY BE INSTALLED WITH ATRENCHING MACHINE AS LONGASADEOUATE
COMPACTION (95% IS ACHIEVED IN THETRENCH.
ALL MAIN AND SERVICE CROSSING BETWEEN WATERAND FORCEMAIN SHALL BE MADE WITH THE
I8" BELOW THE WATER.
THE ENTIRE WASTEWATER SYSTEM IS PRIVATE AND WILL NOT BEOWNED OR MAINTAINED BYTHECTY (EVEN IN THE EVENTOFAFAILURD.
ALL FORCEMAN SHALL BE INSTALLED WDH TRACER WIRE. TRACER VARE SHALL IN INSTALLEDTOTHE SURFACEATALL VALVE BOXES.
5. THE EXISTING SEPTIC SYSTEM ATTHE EXISTING HOUSE ILOT 1) WILLBE PROPERLY REMOVEDAS SOON ASTHE HOUSE ISCONNECTEDTOTHE PRIVATE,
6. ALLCULVERTSAND STORM PIPES WILL BE CLASS III RCP WTTM WAMRITIGHTJOINTS. DETENTION POND OIUTLET RPES WILL BE S" PVC (SOR 35) SEWER
PIPE. ALL STORM SEWER SHALL 8E INSPECTEO BYTHE CITY OF FORT COLONS. SPECIFIC DESIGN OF STORM RPES IS SHOWN ON SHEETS.
]. DRIVEWAYCULVERTS SHALL BE CLASS III RCP CULVERTS WITH FLARED END SECTIONS AND 6'X6'X1 B"TYPE "L" BURIED RIPRAP PADS ONTHE
DOWNSTREAM ENO. THE CULVERTS SHALL BE LOCATED INTHE BORON OFTHE ROADSIDE DITCH AND HAVE I' OFCOVER OVERTHECULVERTS. THE
CULVERTSWILL BE OWNED AND MAINTAINED BYTHE INDIVIDUAL PROPERTYOWNERS. CULVERTSONL0 4.1I.AND12SHALLBE15"ANDCULVERTSON
LOTS 2 AND 3 SHALLBE 18".
B. ONSITE IMPROVEMENTS (NOT INCLUDING WATERMAINI ARETO BE
OWNERS AS SPECIFIED IN THE CCR'S FOR THE DEVELOPMENT).
ERHERTHEHOAORTHEINDNIDUALLOT
B. ALL SANITARY SEWER. STORM SEWER. AND WATERLINE CONSTRUCTION, ASWELLAS POWER ANDOTHER"DRY" UTILITY INSTALLATIONS. SHALL
CONFORM TITHE LOCAL ENTITY STANDARDS AND SPECIFICATONSCURRENTATTHE DATE OFAPPROVAL OFTHE FLANSBYTHE LOCAL ENTRY ENGINEER.
10. ALL EASEMENTSARE PROPOSED AND WILL BE DEDICATED BYTHE PLAT.
11.EASEMENTABBREVMMONSARESHOWNONTHECOVER.
"LE" DENOTES A LANDSCAPE EASEMENTON LOTS 2 AND 4TO DIRECTTHE ORIENTATION OF HOMES AWAYFROMTHE HISTORIC FARM SITE
"DAE" DENOTES DITCH ACCESS EASEMENT FOR ACCESSTO FCRID.
12. THE DRIVES ANDTRAILS WITHIN THE SITE AND THE US, DE, AE. AND EAECORRIDORTO MEGLERWILL BE PRIVATELYOWNEDAND MAINTAINED BYTHE
HOMEOWNER'S ASSOCIATION. THERE WILL BE NO PUBLIC MAINTENANCE OF THE DRIVEATTHISTIMEOR IN THE FUTURE.
13, SEE SHEET 9 FOR STORM SEWER PLAN AND PROFILES.
WATER STRUCTURE LEGEND
No.
TYPE
NMIHING
EASING
No.
TYPE.
NORTHING
EASING
M
MCA D PICK W KOOPT
14385215.2
315298.78
O
ME HTDVRT ASBEM9LY N/ 2 B'YIIINGs 1
145684.Q
315150.69
W22
Y.' "M MACE. CURB STOP R MEM AT
MGM"
3135767.55
p
w5
B' BY
145509.82
315195.25
g
W WATT SERVICE. CURB STOP It 1IETEN AT
145594.69
31 WWI.45
RE
YUIN ME m. CURB sn8 It METER AT
IQ6661.87
315932.76
2
wT
I' II -A' eExD w/R
1436 0 68
3135772.94
x5
W GAUSS SCRNCE, CURB STOP 4 METER AT
1435696.74
31J5881.73
2
2
VP
B' ='-V BEND W/TB
145577.95
313557.15
WtT
W WA1ER W"CE. CURB STOP A NEM AT
1436810.,18
31M41.22
®
O-A-W TIME w/M B B' BY (2)(H B E)
lC$67W.95
3135937.91
®
W wAM MACE, CURB SW! NIM AT
10.M764.55
315767.50
®
5. 117V BERD TIM
1Q6796.17
313581387
®
IF W. M SERNCE. CURB STCR W METER AT
1436827.20
31575.86
MO
B' 11-A' BOD W/1B
145505.18
315755.13
1D0
W *AM SERNCE. CURB STCF A METER AT
1436776 34
3135554.37
M1
e' 11-A' BOND w/w
1436802.94
315T03.91
M2
B' or BEAD W/IB
M571M.74
3135801.15
TOR
W WATER MACE. CURB SM 6A,EM PIT
1436756.71
3135989.33
n3
B' ste. TEE W/ IB Y RUB W/m (sw)
14575.19
3135567.21
®
W WANK MACE, CURB STBP A METEK PIT
145741.90
31505.03
Ma
S' 22.1E BIND TIM
145709.48
315054.60
O
W WAIF MACE. CURB SM a METER PIT
145749.87
315152.63
'AS
MIAI!D STRUCTURE
W15
W WATER MACE. CURB SICP ! NEXT PIT
1Q65Q.46
31515.92
REMOMD STRUCTURE
<g5
N' WATER MACE. CURB SM It METER PIT
1Q6636.99
315096.14
MB
NEMDia, sTRUBTME
TTl
T JOINT DIRECTOR
1436498,29
313591.53
O
REMmm STRUCTURE
®
Y JUNT DFREc11w
1Q6509.92
315415.11
O
WABBTMKY
®
IF CA¢SVAOE
1Q8684.48
3IM1129.T3
PAT HWRNNT W BY (6) W/ 2 ACUARUS
14365111..35
31 5T03.46
M HwR,wT ASSEMBLY a BY (SE) W/ 2 eO DS
1 Q6744.68
315555.07
rwt
CALL UIUTY NOIRCAION
CEER OF ORAOD
811
L812-BUSINESS DAYB IN ADAA*CE
BEFORE YOU NC, SRI OR EXGVATE
TOR THE NIXINB W UNIMMMMO
MERGER UTUTEB.
SANITARY STRUCTURE LEGEND
No.
TYPE
NMMNG
EASING
s
SANITARY RUSHING a10CCIM4
1Q6766.76
3135614.31
NOmTRw r QUARTER TURN, RLL PONT. NIA-SERV A
PEIY BALL VKK N 2' iWNK CARMC NUT k 2' SIP BEND
IQSTT8.81
J1J512.ST
D
ILYDTMY cJMTR BASS. NU- RoRT. NoN-EFRVKEAKE
POLY BALL VALK N 2' SQUARE RpATND NUT 6 2' W SEND
1Q6T4T 98
313810T.08
M
SANITARY RU9HMC CUNNEC ON
1Q675.36
I 3151W.73
p
2- TEE 4 2-Y Y&WS (E R To
14573B42
1 3135943.09
NOTE:
AS BUILT INFORMATION 71'"m BYSCHMIOT EARTH BONDERSON 8/1 /08.
ON OF FORT CULUNS, CdARADO
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NOTES:
I. SEE SHEET 5 FOR UTILITY PLAN NOTES.
2. SEE SHEET 9 FOR STORM SEWER PLAN ANO PROFILES.
40
20
O
40
90
SCALE:
V.M
4b
gkRii ins 6vPE1 CALL J1UTY N011FICATON
CENTER OF COLORADO
811
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RECORD DRAWING INFORMATION IN
ITALICS
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NOTES:
1. MINIMUM OPENING ELEVATIONS SHOWN ONTHE LOTS METRE MINIMUM ELEVATIONS REQUIRED FOR PROTECTION FROM THE IOGYEAR
STORM. MINIMUM OPENING WASCALCULATEO BYTAKINGTI E LOWEST PORITON OFTHE LOT, EKTENDINGA2%GRADETOTHE CENTER OFTHE
LOT,ANOADDINGS". THE MINIMUM OPENING WILL NOTBE AFPROPRIATE FOROPENINGS ONALLSIOESOFAPM`FICULAR LOT. TOPOF
FOUNDATION ELEVATIONS SHOWN MAYCHMGE WITHTHE FlNALHOME DESIGN FOR ANY PARTICULAR LOT. PLOT BANS WILLBE PREPARED
TO SHOW VARIATIONS FROMTHIBGRADING PLAN DESIGN.
2. INSTALL 10' WIDE COCONUT MAT IN ALLNEW DRAINAGE SWALES THATSLOPEATMORETHAN 1%TO ENCOURAGEVEGEFATION. AREAS
REQUIRING EROSION MATTING ARE HATCHED ON THE PLAN.
3. ALLEASEMEN MEPRO MOANDWILLBEDEDICATEDBYTHEPLAT.
CALL UnUW NOnFICAn04
4. THEOMI SANDTRAILS.UPLITIESff CEPTFORRBUCWATERMNMANDSTORMPIPESANOCULVERTSWFMINTHES MDTHEDRIVE
CENTER OFCOLORADO
CORRIDOR MZIEGLER WILL BE PRIVAMLYOWNED AND MAINTAINED BYTHE HOMEOWNER'SASSOCIATION. THERE WILLBE NO PUBLIC
88�11
MAINTENANCEOFTHE DRIVE NOWOR INTHE FUTOAURE.RVMDFICHESWILLBENRFANDWILLBEMMWMNEDBYTIEADJACENTLOT
OWNER. NO LANOBCAPING THATCWLD HAMPER DRAINAGE INTI E ROADSIDE DMCH WILL BEPMMITTED. ALLMAINTENANCE
L!LL 2-BUSNESS DAYS IN ADVANCE
RESPONSIBIL IESAREDEFlNED INTHECCR'SMRTHEDEVELOPMENT.
BRUTE YOU MG. GRAN. CA E%CAVAIE
FOR THE MARKING N VNMGRWMI
5. NOOFFSITEGRADING ISPROPOSEDWTIHTHISDEVELOPMENT.
MEMBER JIUM.
6. ALLCULNE SANOSTORM PIPESWILLBECLASSIII RCPWITHWAM"GHTJDINTS. DETENTIONFONDOUTLETPIPESWILLBEWPVC(SOR
35)SEWERPIPE. ALLSTORMSEWERSHALLBEIN" ECTEDBYTHECITYO MF COLUNS SPECIFICDESIGNOFSTORMPIFESISSHOWNON
THE PLAN ANO PROFlLE SHEEfS.
CITY OF FORT COWNS, CCLORADO
UTILITY PLAN APPROVAL
]. DRIVEWAY CULVERTS SHALLBE CLA95IU RCPCULVERTS WITH FLARED ENO SECTIONS AND 6'%6'%IS' TYPE "L" BURIED RIPRAP PADSONTI E
DOWNSTREAM SIDE. THE CULVERTS SHALL BE LOCATED INTHE BOTTOM OFT E ROADSIDE DMCHAND HAVE 1' OFCOVER OVER THE
CULVERTS. CULVERTSRESARESHOWNONEACHLOT.
APPROVED: _
CNY D%iNEER
B. ALLSANFORY SEWER, STORM SEWER,ANDWATERLINECONSTRATI ON.ABWELLASPOWER
CONFORM TOTiELOCAL ENTITY STANDARDSAN05PECIFlCATIONSCURRENi ATTHE DATE OFAPPROVALOFTIiE PLANS BTTIiE LOCAL
OFAPER"DRN'UTHEPINBTALLAHE LCK
CHECKED BY: _
ENALL
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WATER WWASTFMAMR UTNWY
9.ALLDISNRBEDAREMWILLBESEEDEOANDMULCHED. SEEEROSIONCONTROLR MDLANDBCAPEPLAN.
CHECKED BY: _
91p1YWMER VIIIRY
IO. THE PRIVATE DRIVE SHOULDERS SHALL MATCHTHE CROSS SLOPE FOTHE ADJACENTPAVEMEM.
CHECKED BY: _
PA [IRPIFAMMI
11. THE EKISTING URNNAGE SWALE BETWEEN LOTS 7 AND B WILL BE EVALUATED FOR EROSION OVERTHE NEJTT 5YEMS. IFEROSION OR
HEAD CUTTING OCCURS IN THIS DRAINAGE WAY. A DROP STRUCNRE SYSTEM VALLBE OESIGNEDAND INSTALLED BYTHE HOMEOWNER'S
CHECKED BY: _
ASSOCIATON. ATTHISTIME, THE EX4TING SLOPE WILL BE MAINTAINED IN AN EFFORTTO PRESERVETHE NATURAL LANDFORM INTHISAREA
mNRC DIMON
CHECKED BY:
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PRQI. NO. 105503
7 OF 16
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I. MINIMUM OPENING ELEVATIONS SHOWN ON THE LOTS ARE THE MINIMUM ELEVATIONS REQUIRED FOR PROTEMON FROMTHE IODYEAR 35)SEWERPIM.ALLSTORMSEWERBHALLBEINSPECTEDBYTHECRY FOWCOWNS. SFECIFICOESIGNOFSTORMMI ISWH ON
STORM. MINIMUM OPENING WAS CALCULATED BYTAKINGTHE LOWEST PORTIONOFTHELOT,E%TENOINGA2%GRADETOTHECENTEROFTHE THEPLANANDPROFILESHEES. �_, �• � /fir
LOT.ANDAMRNGS". THE MINIMUM OPENING WILL NOT BEAPPROPRIAM FOR OPENINGS ON ALL SIDES OFAPARRCULAR LOT. TOP OF ORROVEOI O W1E
FOUNDATION ELEVATIONS SHOWN MAY CHANGE WITH THE FINAL HOME DESIGN R FOR ANY PARCULAR LOT, PLOTPLANSWILLBEPREPARED Z. DRIVEWAYCULVERTS SHALL BE CLASS III RCPCULVERTSWITH RARER END SECTIONS AND6'%8•%ISCTYPE"L" BURIED RIPRAPPADSONTHE - O //
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CORRIDOR TO ZIEGLER WILL BE PRIVATELYOWNEDAND MAINTANED BYTHE HOMEOWNER'S ASSOCIATON. THERE WILLBE NO PUBLIC _
10. THE PRIVATE DRIVE SHOULDERS SHALL MATCH TiE CROSSSLOPE FOTiEAOJACENT PAVEMENT CHECKED BY: OWNER. NOEOFTHEDRNENOWCRIN THEFUNRE. RAGE IN IEDITCHESWEDMCH ILL BE WILLBE ITMAINTAINED B)"THE
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