HomeMy WebLinkAboutC-5.2 Drainage Plan MERIDIAN CITY APPROVAL
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2815 East 3300 South, Salt Lake City, UT 84109
(801) 305-4670 www.edmpartners.com
SHEET NOTES:
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1. SEE SHEET C-1.1 FOR NOTES.
2. SEE SHEET C-5.3 FOR STORM WATER DETAILS.
3. GROUNDWATER ELEVATIONS ARE EXPECTED TO REMAIN AT OR BELOW I >;
12.5 FEET FROM EXISTING GROUND SURFACE. FOR ADDITIONAL I I :it I 14 15 16 17 16 15 14 13 12 11 1
INFORMATION, REFER TO THE GEOTECHNICAL REPORT#B222755g GRIMMETT LATERAL TO ' ` SCALE: 1" = 80'
PREPARED BY ATLAS TECHNICAL CONSULTANTS, DATED JANUARY 27, REMAIN OPEN DITCH, 13 ------- ------ - _
2023. SEE SHEET C-2.0 FOR TEST PIT LOCATIONS. ALL GROUNDWATER PROTECT IN PLACE -_ - a
DEPTHS WERE GREATER THAN THE DEPTH OF THE MONITORING WELLS. 12 - - U, ..k 0 40 80 160 240
CONTRACTOR SHALL NOTIFY THE ENGINEER IMMEDIATELY IF ---- o
GROUNDWATER IS ENCOUNTERED WITHIN 3-FEET OF THE BOTTOM I I 1 I - - OWNER:
DESIGN ELEVATION FOR ANY INFILTRATION FACILITY AND/OR IF IT IS a _-- CB-6, O CB 3, 0 O7 Dawson Ranch, LLC
--� - - STA: 10+06.82, 15.62'L STA: 7+72.50, 15.40'R Y
HIGHER THAN ANTICIPATED. t 7 RIM: 2750.17 3L
- 2 7 O 6865 S. Pemberley Pl.
O7 O RIM: 2748.80 FL OUT: 2745.45 12"(W) CB 4, wA: 4+11.68, 15.55'R T STA: 4+11.707 15.43'L O Q
CB-5, FL IN: 2745.57 12"(E) -�; OAFS STA: 7+72.45, 15.59'L RIM: 2750.16 1 RIM: 2750.16 m 00 Meridian, ID 83642
4. THE DESIGN INFILTRATION RATES ARE BASED ON A 5% REDUCTION OF O I �.,
�� STA: 10+06.19, 15.61'R FL OUT�27 5.4Zi2"('7Cr Q100: 0.38 CFS RIM: 2750.16 UT: 2748.21 12"(W) FL IN: 2746.07 12" (E) Contact:Jarron Langston
THE RECOMMENDATIONS IN THE FOLLOWING REPORT: B222755 RIM: 2748.80 29'1.30 CFS 25: 0.89 CFS FL OUT: 2746.07 12" (SW)PREPARED BY ATLAS TECHNICAL CONSULTANTS AS DATED ON JANUARY FL OUT: 2746.19 1.Z;4.W) Q100: 1.82 CFS 8 FL O : 274 . 1 1(E) Q Phone: (208)724-6239
25' LANDSCAPE '� 31 LF OF 12"ADS FL OUT: 2745.17 12"(W) Q100: 1.24 CFS _Q25: 1.49 CFS �
27, 2023. CONTRACTOR SHALL VERIFY INFILTRATION RATE AFTER THE BUFFER O7 t : 1.81 CFS HP SD @ 0.5% Q25: 0.38 CFS 8 Q100: 2.08 CFS \
Q100: 1.14 CFS 5
FACILITY IS FULLY EXCAVATED WITH THE ACHD INSPECTOR PRESENT. I / ' Q100: 0.53 CFS 31 LF OF 12"ADS HP SD @ 6.9%
5. PROVIDE WATER-TIGHT SEALS AT PIPING ENTRANCES AND EXITS FOR EX. SLOPE / 31 LF OF 12"ADS HP SD C�2.0% 8 S. NETHERFIELD WAY 8+00_ 7+
$ 4+00 3+00 2+00
CATCH BASINS, DIVERSION BOXES, AND MANHOLES. EASEMENT I I 3 _9+00- - 6+00 5+00 45.
-
7 94 LF F PERFORATED 18"ADS HP SD @ 0.0% 5 LF OF 12"ADS 5
1 BHP % 22 LF OF 12"ADS HP SD @ 2.5% NOTES:
6. ALL STORM PIPE WITHIN RIGHT-OF-WAY SHALL BE C900 WHERE COVER _ = 2 ♦ 7 LF OF 12"ADS
OVER PIPE IS LESS THAN 2 FEET. OUTSIDE OF THE RIGHT-OF-WAY OR , I 5 ___11+00 - 5 HP SD c 0.8% 12 LF OF 18"ADS HP SD @ 0.0%
I I ���� 23 LF OF ERFORATED 18"ADS HP SD C�O.o% SGT 1 \ 0 1. This drawing is considered preliminary unless
WHERE COVER IS GREATER THAN 2 FEET, THE STORM PIPE SHALL BE o 17 LF OF 18"ADS HP SD 0.0% STA: 4+03.10, 35.28'L \ affixed with a municipal approval or
ADS HP (ASTM F2881) PIPE OR APPROVED EQUAL. FLOWABLE FILL I ti 26 LF OF 18"ADS HP SD C�0.0% RIM: 2750.79 44 LF OF PERFORATED 18"ADS HP SD @ 0.0%
SGT- '•••," accompanied by a separate approval document.
SHALL BE USED WHEN LESS THAN 5-FEET OF SEPARATION BETWEEN .� SGT-2, FL IN: 2746.62 12" (NE)
STA: +O(r96'2 .09'L 2. All sanitary sewer improvements shall conform
STA: 7+72.33, 22.12'L FL OUT: 2745.77 18"(W) 5 Y P
STRUCTURES. I RIM: 2752.92 RIM: 0.00 ` 'v Q25: 1.49 CFS \ with the standards and specifications of the
FL IN: 2745.26 12" (E) IN: \ City of Meridian.
\ O I rFL OUT: 2744.40 18"(N) FL OUT: 2744.27 18" (N) 7 0: 2.08 CFS 1 \
7. ALL DRAINAGE STRUCTURES SHALL BE PER ISPWC STANDARDS AND THE CB-7, Q25: 1.30 CFS STA: 13+14.18, ( ) 3. All culinary water improvements shall conform
k
ACHD SUPPLEMENTS TO THE ISPWC. STORM DRAIN STRUCTURES SHALL \ ' O o
g .66 R Q25: 0.38 CFS
g Q100: 1.82 CFS 7 Q100: 0.53 CFS o with the standards and specifications of the
HAVE HS-25 TRAFFIC RATED LIDS UNLESS OTHERWISE SPECIFIED. RIM: 50.20 O VERTEX PHASE 1 City of Meridian.
FL OUT: 2748.37 12" (S) o C 8, i"•.
8. THE CONTRACTOR SHALL COMPLY WITH ALL THE REQUIREMENTS FOR I Qoo: 2 2 CFS + S A. 2753.980, 15.25'L ��P�EFZP�' SUBDIVISION 4 shall onform with the standAll improvements in the ards and c right f way
STORM WATER DISCHARGE ASSOCIATED WITH CONSTRUCTION \ l FL T: 2748.29 12"(N) F P�
ACTIVITY. THIS INCLUDES IMPLEMENTING THE BMP'S RECOMMENDED IN I ` 23 LF OF 12"ADS HP SD @ 0.5% \ Q25: 0. 9 CFS specifications of the Ada County Highway
THE SWPPP PLAN PREPARED FOR THIS SITE, REGULAR SITE I SD-2, \Q1oo: \0 CFS O �' District (ACHD) and the Idaho Standards For
INSPECTIONS DOCUMENTATION OF MODIFICATIONS TO THE SWPPP STA: 13+14.09, 7.58'L 8 LF OF 12"ADS Public Works Construction ACHD Supplement
' RIM: 2750.40 HP SD 0.5% (ISPWC-ACHD).
AND OTHER REQUIREMENTS AS SET FORTH IN THE NPDES GENERAL ` FL IN: 2748.25 12"(N) 5. All private improvements shall conform to Idaho
PERMIT. I FL IN: 2748.25 12"(s) = o O j�7 Standards For Public Works Construction
FL OUT: 2748.25 12"(W) v
I O Q25: 2.0o cFs � � (ISPWC) standards and specifications.
9. ALL CHANGES REQUIRE APPROVAL BY THE DESIGN ENGINEER AND Q100: 2.80 CFs ^' SG -4, 6. Contractor to field locate and verify the
ACHD. I SD-3,' / ST 275211
STA: 15+01.79, 7.57'L L IN: 2747.26 12"(N) prior to beginning work.91, 17.86'L horizontal and vertical location of all utilities
_ 5
10. THE CONTRACTOR SHALL PROVIDE AND INSTALL STORM DRAIN RIM: 2752.16 FL OUT: 2746.38 18"(S)
MANHOLES, SEDIMENT BOXES, DROP INLETS, AND OTHER PIPE FL IN: 2747.31 12" (E) Q25: 2.00 CFS
JUNCTIONS OR TERMINUSES IN ACCORDANCE WITH SECTION 8018 OF 6M FL OUT: 2747.31 12" (S)___1 Q100: 2.80 CFS
OF THE ACHD DEVELOPMENT POLICY MANUAL AND ISPWC SD-623. I , O Q25: 2. CFS 5 5
Q100: 2.80 0 CFS �
o \ 10 LF OF 12"ADS HP SD @ 0.5%
11. FOR UTILITY CONTRACTS AT SEEPAGE BED LOCATIONS, THE I 15 LF OF 18"ADS HP SD @ 0.0% 65 LF OF 18"ADS HP SD @ 0.0% SURVEYOR
CONTRACTOR SHALL CONFORM TO THE STANDARDS SET BY THE CITY 0 4
OF MERIDIAN AND SECTION 8200 OF THE ACHD STORMWATER
GUIDELINES. 4 U) VERTEX PHASE 1 COMPASS LAND SURVEYING PLLC
SUBDIVISION 623 11TH AVE SOUTH
12. INSTALL STORM DRAIN MANHOLES PER ACHD SUPPLEMENTAL DETAIL NAMPA, ID 83651
SD-611 WITH REINFORCED CONCRETE REDUCER SLAB IN PLACE OF I
(208)608-2510
ECCENTRIC CONE SECTION. ALL MANHOLES SHALL BE HS-25 RATED. CONTACT:�
(S) RICHARD GRAY, PLS
13. THE STORMWATER DESIGN IS BASED ON SECTIONS 8000 AND 8200 OF
THE 2017 ACHD POLICY MANUAL. // LANDSCAPE ARCHITECT
/
14. WHEN SAND AND GREASE TRAP IS LOCATED WITHIN THE SIDEWALK, I \ STACK ROCK GROUP
PROVIDE LOCKING LIDS BROUGHT FLUSH. 404 S. 8TH ST., SUITE 154
10' SIDEWALK I �� BOISE, ID 83702
DRAINAGE KEYNOTES I /� CONTACT4787
-io // (LA)JESSE BUSTER
1O SB #1. SEE SEEPAGE BED DETAIL ON SHEET C-5.3.
20 SB #2. SEE SEEPAGE BED DETAIL ON SHEET C-5.3. I / /// APPROVED FOR CONSTRUCTION:
10.00' P.U.E. / These plans are valid for construction only with the
SB #3. SEE SEEPAGE BED DETAIL ON SHEET C-5.3.
\'� / signature of the design engineer on the line below.
30 /
IN /
4O SB #4. SEE SEEPAGE BED DETAIL ON SHEET C-5.3. Approved Date
\5 INSTALL GROUNDWATER OBSERVATION WELL PER ACHD SD-627, SHEET /
C-5.3. WITHIN THE INFILTRATION BED, INSTALL 5' FROM THE END. O
o� OUTSIDE OF THE BED, INSTALL A MINIMUM OF 50' FROM THE PERIMETER
3 I I :'. I BUILDER TO CONSTRUCT REAR-LOT SEEPAGE ONAL F
� OF THE BED. ti N�
BED FOR LOT RUNOFF IN ACCORDANCE WITH
6\ LOT TO HAVE ON-SITE PRIVATE STORMWATER DISPOSAL TO MANAGE
DRAIN INLET TO SUBSURFACE THE SUBDIVISION CCBR'S AND ARCHITECTURAL F O ��•�
c� ALL RUNOFF FROM THE LOT. SYSTEM TO BE CONSTRUCTED WITH DESIGN STANDARDS. NO RUNOFF SHALL PASS
SEEPAGE BED
ONTO ADJACENT SLOPE.
BUILDING PERMIT FOR HOME CONSTRUCTION. SEE DETAIL ON THIS 14176
IF HOME OWNER CHOOSES TO INSTALL
Q SHEET FOR SUBSURFACE DISPOSAL SYSTEM. SHOULD HOMEBUILDER ��- SURFACE STORM WATER FACILITY INSTEAD OF N�12/19/24ro
N DESIRE AN ALTERNATE SYSTEM, AN ALTERNATE DESIGN SEALED BY AN \ A SEEPAGE BED,THE SURFACE FACILITY MUST �T P
U ENGINEER LICENSED IN THE STATE OF IDAHO MUST BE SUBMITTED TO �r BE SIZED TO TREAT THE 100 YEAR RUNOFF VOLUME.
9,4 F of
THE CITY AND ACHD FOR REVIEW AND APPROVAL
�� T � R .
\7 LOT TO HAVE ON-SITE PRIVATE STORMWATER DISPOSAL TO MANAGE 1 1
REAR PORTION OF DRAINAGE. SYSTEM TO BE CONSTRUCTED WITH V MIN.
v BUILDING PERMIT FOR HOME CONSTRUCTION. SEE DETAIL ON THIS INLET FROM 6"MIN. 4"PERFORATED PIPE V MIN. Keep West
SHEET FOR SUBSURFACE DISPOSAL SYSTEM. SYSTEM SPECIFICATIONS, SURFACE DRAINItNATIVE BACK NATIVE BACKFILL
E BELOW, HAVE BEEN DETERMINED FOR MANAGING THE ANTICIPATED
N RUNOFF FROM THE LARGEST REAR-LOT AREA. SHOULD HOMEOWNER .'MIN. o 0 0 10 WRAP DRAIN ROCK IN FINISH FLOOR±1.0' SL1bC11V1S1011
SEEK TO REDUCE THE SIZE OF THE SYSTEM A LOT SPECIFIC DESIGN CAP END �/ //mil NON WOVEN GEOTEXTILE TOP ABOVE HIGHEST
AND SIDES OF THE SEEPAGE BED ADJACENT BACK OF
a SEALED BY AN ENGINEER LICENSED IN THE STATE OF IDAHO MUST BE 2"DRAIN ROCK WALK ELEVATION
4"OF 3/4"PIPE\/ O O DU
O`\O Drainage Plan
SUBMITTED TO THE CITY AND ACHD FOR REVIEW AND APPROVAL. DRAINAGE SUBAREA MAP BEDDING o ° o 0 0 0 0 0 \ \
SHOULD HOMEBUILDER DESIRE AN ALTERNATE SYSTEM, AN ALTERNATE
A DESIGN SEALED BY AN ENGINEER LICENSED IN THE STATE OF IDAHO SCALE: 1" = 250' L - W
MUST BE SUBMITTED TO THE CITY AND ACHD FOR REVIEW AND PROJECT:
w APPROVAL. SEEPAGE BED PROFILE VIEW SEEPAGE BED SECTION VIEW l DRAWN BY: CRS
N CATCH BASIN PER ACHD SD 604A TYPE IV. 1 T DETACHED CONCRETE SIDEWALK REVIEWED BY: ERB
O8 REVISIONS:
a
90 14'WIDE GRAVEL ACCESS, PER ISPWC SD 304 SEEPAGE BED TABLE •��3"ROLLED CURB NO. DATE REMARKS
-�.
SEEPAGE SEEPAGE BED SEEPAGE BED SEEPAGE BED SEEPAGE BED
100-YR DESIGN
x TREATED INFILTRATION
BED NO. WIDTH (W) LENGTH (L) DEPTH (D) VOLUME
U VOLUME RATE
LOT GRADING DETAIL
o O LOT 34 12.0' 30.0' 5.0' 720 CF 993 CF 8 IN/HR
F.
o O BACKYARDS 10.0' 26.0' 4.0' 416 CF 591 CF 8 IN/HR
o (0.36 AC) DATE:
Q December 19, 2024
REAR-LOT DRAINAGE (PRIVATE) - SEEPAGE BEDS DETAIL SHEET NUMBER:
Q C � 592
A