HomeMy WebLinkAboutCT 05-18; Seascape; Addendum 1 to Storm Water Quality Management Plan; 2017-07-24ADDENDUM 1 TO:
Storm Water Quality Management Plan (SWQMP)
Seascape
CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP)
ADDENDUM 1 TO:
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP)
FOR
SEASCAPE
CT 05-18
DRAWING No.: DWG 475 -7
SWQMP No. 12-09
ENGINEER OF WORK:
PREPARED FOR:
SEASCAPE DEVELOPMENTS, LLC
6540 Lusk Blvd. Suite C135
San Diego, CA 92121
858-658-9400
PREPARED BY:
Civcom & Associates
6540 Lusk Blvd. Suite C135
San Diego, CA 92121
858-658-9400
DATE:
Rev. July 24, 2017
1
RECEIVED
AUG O 8 20!
LANO DE\,ELOPMENT
ENG/NEERING
REASON FOR CHANGE:
ADDENDUM 1 TO:
Storm Water Quality Management Plan (SWQMP)
Seascape
In order to eliminate lateral movement of water thru the sides of the infiltration basin or
the trench it was recommended that the proposed filter fabric as shown on the typical
section be replaced with a pvc liner. It was proposed that a Liner "HOPE 30 mil" thick be
used. As a further precaution, the liner be folded a minimum of 6" lap fold at the bottom
only on the side that parallels a road or a slope. On the other sides there is no need of
this 6" fold . See attached revised Typical Section on the following page ..
2
ADDENDUM 1 TO:
Storm Water Quality Management Plan (SWQMP)
Seascape
DMATABULARSUMMARY
TYPICAL DETAIL OF INFILTRATION TRENCH (REVISED)
DRAWDOWN CALCULATION WORKSHEETS (REVISED)
3
ATTACHMENT1b
----------·----··------...
'·
NATURAL SOI..
PVC FOOTPLATE
TYP. SEC. -INFILTRATION CELL/TRENCH
,.7 .
DMAid LOT NO.
dma 1 L1
dma 2 L2
dma3 L3
dma4 L4
dma 5 LS
dma 6 L6
dma7 L7
dma B LB
dma 9 L9
dma10 L10
dma11 L11
dma12 L12
dma 13, dma 14,
dma17, Area A1, 7 Area A2, Area A3,
AreaA4
*Design Capture Volume -cu.ft.
SEASCAPE CT 05-18 SWMP NO. 12-09
DRAWDOWN CALCULATIONS (ADDENDUM 1)
PER APPENDIX 8.4-1
BMP
DCV* SUB-SURFACE AVERAGE INFILTRAT
CU.FT. INFILTRATION DEPTH ION RATE
AREA IN/HR
174 144 1.21 3.38
180 137 1.31 3.38
173 148 1.17 3.38
180 148 1.22 3.38
169 148 1.14 3.38
207 166 1.25 3.38
197 156 1.26 3.38
228 163 1.40 3.38
323 349 0.93 3.38
196 166 1.18 3.38
283 227 1.25 3.38
382 221 1.73 3.38
2,912 1,330 2.19 3.38
DRAW
DOWN
TIME
HR
4.29
4.66
4.15
4.32
4.05
4.43
4.48
4.97
3.29
4.19
4.43
6.14
7.77