HomeMy WebLinkAboutCT 04-22; OCEAN VISTA ESTATES; DRAINAGE STUDY & STORM WATER MANAGEMENT PLAN; 2005-07-22I
I
I
I
I
I
I
I
I
I
I
I'
I
I
I
I
I
I
I
DRAINAGE STUDY &
STORM WATER MANAGEMENT PLAN
for
OCEAN VISTA ESTATES
SOP 04-06/COP 04-21/PUO 04-09
APN: 203-144-01
Prepared (or:
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
Telephone: (760) 602-4600
Prepared by:
Alta Cons~l~nts
4901 Morena Blvd., Suite 409
San Diego, CA 92117
(858) 581-6101, Fax (858) 581-6138
Bartolome J. Pastor, RCE 38606
Project Site Address:
Ocean Street
Carlsbac;l, CA 92008
Revised:
July 22, 2005
Submitted by:
GO'FAT, LLC
160 Tamrack Ave.
Carlsbad, CA 92008
~~z-tJ5
Date
ALTA CONSULTANTS
PLANNING ENGINEERING SURVEYING
4901 Morena Blvd., Suite 409, San Diego, CA 92117, Tel. (858) 581-6101, FAX (858) 581-6138
("' 1 ~
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Storm Water Management Plan (SWMP)
Ocean Vista Estates
APN: ~Q3-144~01
Table of Contents
INTRODUCTION
1. PROJECT DESCRIPTION
1.1. Topogrophy and Land Use ......................................................................................................... .
1.2. Hydrologic Unit Contribution ...................................... , ....................................... \ ..................... .
2. WATER QUALITY ENVIRONMENT
2.1. Beneficial Uses .......................................... : .................................................................................. ~
2.1.1. Inland Surface Waters ............................................. ; ..................................................... .
2.1.2. Coastal Waters ............................................................................................................. ..
2.1.3. Groundwater ...................................... , .......................................................................... .
2.2. 303( d) Status ............................................................................................... :.: ............................. .
3. CHARACTERIZATION OF PROJECT RUNOFF
3.1. Existing and Post-Construction Drainage ................................................................................. ..
3.2. Post-Construction.Expected Disch,arges ........................................................................... : ......... .
4. WATER QUALITY ENVIRONMENT
4.1. Construction BMPs ....................................................................................... , ......................... ~ .. .
4.2. Post-Construction BMPs ......................................................................................................... ; ..
4.2.1. Site Design BMPs ............................................................................. t ........................... .
4.2.2. Source Control BMPs .................................................................................................... ..
4.2.3. Treatment Control BMPs .................... , ......................................................................... .
5. OPERATION AND MAINTENANCE PROGRAM
6. FISCAL RESOURCES
7. SUMMARY & CONCLUSIONS
ATTACHMENTS
Attachment A ......................................................................................................... Vicinity Map
Attachment B ................................................................................. Site Plan. and BMP Drawlilg
Attachment C ............................................................ \ ................. Hydrology Calculation Tables
Attachment D .......................................................................... 8Sth Percentile :Precipitation, Map
Attachment E ....................................................................................................... Formula Sh~et
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Storm Water Management Plan (SWMP)
Ocean Vista Estates
. APN: 203-144-01
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Storm Water Management Plan (SWMP)
. Ocean Vista Estates
APN: 203-144-01
INTRODUCTION:
The Stormwater Management Plan (SWMP) is required per the City of Carlsbad. The purpose oftPis
SWMP is to address the water quality impacts frOIn the proposed improvments on the Ocean Vista
Estates project on Ocean Street. Best Management Practices (BMPs) will b¢ utilized to provide a
long-term solution to water quality. This SWMP is also intended to ensure the effectiveness of the
BMPs through proper maintenance. The SWMP is ~ubject to revisions as needed by the Engineer.
1.0 PROJECT DESCRIPTION
The 0.64 acre Ocean Vista Estates Project is located on the east side of Ocean Street in the City of
Carlsbad (see Attachment A). The project is located at the southeast comer of the mtersectionof
Ocean Street and Beech Avenue. This project will consist of 4 detached single-family homes with
und~rground parking.
1.1 Topography and Land Use
The existing project area is characterized by rolling grassy hills, and is designated urban. Currently,
the lot is undeveloped with the Pacific Ocean approximately 200 ft due west.
1.2 Hydrologic Unit Contribution
The Ocean Vista Estates Project is located in the Carlsbad watershed and in the El Saito hydrolic
unit (4.21). The project drains southerly along Ocean Street. The storm drain system for this project
will consist of multiple catch basins and cleanouts on site to mitigate runoff to the existing system in
Oceah Street. Runoffwill be conveyed through existing curb & gutter, or asphalt berm, to existing
storm drain inlet at Ocean Street and Christiansen Way. A negHgable quantity ofruno:(fWill run
down the proposed driveways to a slotted drainpipe and. will be sump-pumped to outlet to Ocean
Street. The runoff quantity and velocities leaving the site are shoWn in the hydrology calculation
tables in Attachment C. Overall, the project area represents less than 0.1 percent of the watershed.
2.0 WATER QUALITY ENVIRONMENT
2.1 Beneficial Uses
The benefidal use for the hydroloic unit are inclqded in this section. These definitions have been
extracted from the Water Quality Control Plan for the San Diego Basin.
MUN -Munieiple and Domestic S~pply: Includes uses of water for community, military, or
individual water supply systems including, but not limited to, drinking water supplyu.
AGR -Agriculteral Supply: Includes uses of water for individru,tl activites that do not depend
primarily on water wuality including, but not limited to, mining, cooling water supply, hydraulic
conveyance, gravel washing, fire protection~ or oil well re-pressurization.
IND -Industrial Service Supply: Includes uses of water for industrial activities that do not depend
primarily on water quality including, but not limited to, mining, cooling water supply, hydraulic
conveyance, gravel washing, fire protection, or oil well re-pressurization.
RECI -Contact Recreation: Includes uses of water for recreational activities involving body
contact with water, where ingestion of water is reasonably possible. These uses include, but are not
I
I
I
I
I
I
I
I
I,
I
I
I
I
I
I
I
I
I
I
Storm Water Management Plan'(SWMP)
Ocean Vista Estates
APN: 203-144-01
limited to, ~wimming, wading, water-skiing, skin and SCUBA diving, surfing, white water activities,
fishing, or ~se of natural hot springs.
REC2 -Non.,Contact Recreation: Includes the uses of water for reyreational involving proximity
to water, but not normally involving body contact with water, where ingestion of water is reasonably
possible. These uses include, but ar enot limited to, picnicking, sunbathing, hiking, camping,
boating, tide pool and marine life study, hunting~ sightseeing, or easthetic enjoyment in conjunction
with the above activities.
wARM -Warm Freshwater Habitat: Includes uses of water that support warrtl water ecosystems
including, but not limited to, preservation or enhancement of aquatic habitats, vegitation, fish or
wildlife, including invertebrates.
MAR -Marine Habitat: Includes uses of water that support marine ecosystems including, hut not
limited to, preservation or enhancement of marine habitats, vegetation such as kelp, fish, shellfish, or
wildlife (e.g., marine mammals, shorebirds).
WILD -Wildlife Habitat: Inculdes uses of water that support terrestrial ecosystems including, but
not limited to, preservation and enhancement of terrestrial habitats, vegetation, wildlide, (e.g.,
mammals, birds, reptiles, amphibians, invertebrates), or wildlife water and food sources1 "
BIOL -Preservation of Biological Habitats of Special Significance: Includes uses of water that
support designated areas or habitats, such as established refuges, parks, s~ctuaries, ecologic;:tl
reserves, or Areas of Special Biological Significance (ASBS), wher€( the preservation or
enhancement of natural resources requires special protection.
RARE -Rare, 'J;'hreatened, or Endangered Species: Includes uses of water that support habitats
necessary, at least in part, for the survival and successful maintance of pla:pt or animal species
established under state or federal law as rare, threatened or endangered. '
2.1.1 Inland Surface Waters
Inland surface waters for the EI Salto hydrolic unit (4.21) have the following benefici;:tl uses:
AGR
IND
RECI
REC2
WARM
WILD
RARE
2.1.2 Coastal Waters
Coastal waters for the EI Salto hydrolic unit (4.21) have the following beneficial uses:
RECI
REC2
BIOL
EST (potential)
WILD
RARE
MAR
WARM
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
2.1.3 Groundwater
Storm Water Management Plan (SWMP)
Ocean Vista Estates
APN: 20~·144·01
GrO.undwaters fDr the EI SaltD hydrO.lic unit (4.21) have the fO.llO.wing beneficial uses:
MUN
AGR
IND (potential)
2.2 303( d) Status
AcoDrding to' the CalifDrnia 303(d) list published by the San Diego. RegiDnal Water Quality CDntrDI
BDard, there are no impaired waterbodies that are assDciated with this prO.ject. The prO.Ject locatiO.n
and watersheds have been cO.mpar~d to' the current published 303( d) list Df impaired waterbDdies and
the nearest impaired waterbDdy is Buena Vista LagDDn, impaired by sedimentatiDn/siltation. Buena
Vista LagDDn is approximately 112 miles nDrtherly frO.m this prDject.
3.0 CHARACTERIZATION OF PROJECT RUNOFF
3.1 Existing and Post-Constmction Drainage
The prO.pDsed prDject will slightly alter drainage patterns Dn the site. There will be an increase in the
amDunt O.f imperviO.us area O.n the site. CleanO.uts, catch basins and drains are prO.pDsed to' cDntrDI
the runO.ff created by this develDpment. Approximately 0.40 acres O.f O.pen grO.und will be cO.nverted
to' single-family residential buildings and paving, thus representing a change O.f 65% to' the
imperviO.us area. This change in land use will increase the cO.mpDsite runoff cO.efficent O.fthe prO.ject
frO.m C=0.42 to' C=0.8S. AlSo., the peak flO.w rate leaving the site will increase from 1.12 cfs under
the existing cDnditiO.n (sheet flO.w) to' 3.91 cfs under the prO.pDsed conditiO.n.
As discussed in sectiO.n 2, the existing CO.nditiDn is undevelDped. The existing natural' eIiviroinnent
serves as a biD-filter fDr the runO.ff generated from the existing site.
PO.st-CO.nstructiO.n runDff will be directed into' the existing storm drain system in Ocean. Street. This
system will nDt divert water frO.m its natural flO.w directiO.n. The preliminary design O.f this system, is
included in the BMP map (see Attachment B). Summaries O.fthe pO.st-cO.nstructiDn calculatiO.ns are
included in Attachment C. The flDWS were develO.ped using the 85th Percentile PrecipitatiO.n map
develO.ped by the CDunty O.f San Diego. (see Attachment D), as well as the CDunty O.f San Diego. .
HydrO.lO.gy Manual (see attachment E).
3.2 Post-Constmction Expected Discharges
There are no. sampling data available fDr the existing site cQnditiDn. In additiDn, the prO.ject is not
expected to' generate significant amO.unts Df nO.n-visible PO.I1utants. HO.wever, the fO.llO.wing
cO.nstituants are cO.mmO.nly fO.und O.n similar prO.perties and CO.uld affect water quality:
• Sediment discharge due to cO.nstructiDn activities
• Nutrients frDm fertilizers
~ Trash and debris
• HydrDcarbDns frDm paved areas
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
• Pesticides from landscaping and home use
Storm Water Management Plan (SWMP)
Ocean Vista Estates
APN: 20~.144·01
4.0 MITIGATION MEASURES TO PROTECT WATER QUALITY
To address water quality for the project, BMPs will be implemented during construction and post-
construction.
4.1 Construction BMPs
Grading and Improvement plans for this project are not yet 'available, however, potential BMPs may
include:
• Stabalized Construction Entrance
• Detention-Pond
• Grassy Swale
• Rip-rap Swale
• Silt Fence
• Gravel Bag Barriers
• Bonded Fiber Matrix for slope stablization
• Storm Drain Inlet Protection
• Permanent Revetation of all disturbed uncovere4 areas
Selected construction BMPs for this project will be constructed and maintanted so as to comply with
all applicable ordinances and guidance documents.
4.2 Post-Construction BMPs
Pullutants of concern as noted in section 3 will be addressed through three types ofBMPs. These
types of BMPs are site design, source control, and treatment control.
4.2.1 Site Design BMPs
The project is designed to minimize the use of impervious areas. Only 65% of the project area will
be impervious. Landscaping of the slopes and common areas are incorporated into tbe plans. The
landscaping will consist of both native and non-native plants. The goal is to achive plant
establishment expeditiosly to reduce erosion. The irrigation system for these landscaped areas will
be monitored to reduce over irrigation.
4.2.2 Source Control BMPs
Source cOQ,trol BMPs will consist of measures to prevent polluted runoff. This program will include
an educational component directed at the homeowner. The homeowner will receive a set of
brochures developed by the County's Environmental Health Department. These will include the
following:
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
• Stonnwater Runoff Pullution Fact Sheet
Storm Water Manag~ment Plan (SWMP)
Ocean Vista Estates
APN: 20$-144-01
• Stormwater Runoff Pullution Prevention Tips for Homeowners
• Stormwater Pollution Prevention Yard Work (Landscaping, G~dening, Pest Control)
• Stormwater Pollution Prevention Pet Waste
4.2.3 Treatment Control BMPs
The following treatment control BMPs will be implemented to address water quality:,
• Catch Basins & Cleanouts
• Driveway drain w/sump pump
Placements of the BMPs are noted on the project plans and in AttaChment B.
5.0 OPERATION AND MAINTENANCE PROGRAM
The operation and maintenace requirements for each type of BMP is as follows:
5.1 Catch Basins & Storm Drains
The operational and maintenance needs of the Catch Basins are:
• Pteventative maintenance on monitoring.
Inspection Frequency
The facility will be inspected:
• Once a month at a minimum
• After every large storm (after every storm monitored or those storms with more than 0.50
inches of precipitation)
• On a weekly basis during extended periods of wet weather
Debris and Sediment Disposal
Waste generated at catch basins and drains is ultimately the responsibility of the homeowner.
Disposal of sediment, debris, and trash will comply with applicable local, county, state, and federal
waste control programs.
Hazardous Waste
Suspected hazardous wastes wjll be analyzed to determine disposal options. Hazardous wastes
generated onsite will be handled and disposed of according to applicable local, state, and federal
regulations. A solid or liquid waste is considered a hazardous waste if it exceeds the criteria listed in
the CCR, Title 22, Article 11.
6.0 FISCAL RESOURCES
I
I
I
I
I
I
I'
I
I
I
I
I'
I
I
I
I
I
I
I
Storm Watet:Management Plan (SWMP)
Ocean Vista Estates
APN: 203-144-01
The responsible party for the Ocean Vista Estates project will ultimately be the homeowners of the
individual units. Listed below is the current Land Owners information:
GOFAT, LLC
160 TamarackAvenue
Carlsbad, CA 92008
7.0 SUMMARY & CONCLUSIONS
This SWMP has been prepared in accordance with the City of Carlsbad and the County of San Diego
Stormwater Standards Manual. This SWMP has evaluated and addressed the potential pollutants
associated with this project and their effects on water quality. A summary of the facts and findings
associated with this project and the measures addressed by this SWMP are as follows:
• The beneficial uses for the receiving waters have been identified. None of these beneficial
u&es will be impaired or diminish due to the construction and operation of this project.
• The Ocean Vista Estates project will not significantly alter drainage patterns on the site. The
discharge points will not be changed.
• Only 65% of the total project area will be impervious. Op~n areas and slopes will be
landscaped to reduce or eliminate sediment discharge.
• The proposed construction and post-construc;tion BMPs address mitigatiqn measures to
protect water quality and protection of water quality objectives and beneficial uses to the
maximum extent practicable.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Storm Water ManageinentPlan (SWMP).
Ocean Vista Estates
APN: 203·144·01
THIS STORMW ATER MANAGEMENT PLAN HAS BEEN PREPARED UNDER THE
DIRECTION OF THE FOLLOWING REGISTERED CIVIL ENGINEER. THE REGISTERED
CIVIL ENGINEER ATTESTS TO THE TECHNICAL INFORMATION CONTAINED HEREIN
ANP THE ENGINEERING DATA UPON WHICH RECOMMENDATIONS, CONCLUSIONS,
AND DECISIONS ARE BASED. .
Bartolome J. Pastor
REGISTERED CIVIL ENGJNEEJ?
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
ATTACHMENT A
Vicinity Map
Storm Water Management,Plan (SWMP)
Ocean Visfa·Estates
APN: 203·144~01
I
I
I
I
I
OCEAN VISTA ESTATES
I SITE
I
I
I
I
I
I
I
I
I
I
I
I
I
ALTA CONSULTANTS
PLANNING ENGINEE~ING SURVEYING
4,901 Korena Blvd. Ste. 4,09 San Dleco. CA 92117 (858) 581-6101 Fax (858) 581-6138
VICINITY MAP
NOT TO SCALE
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
ATTACHMENT B
Storm Water Management. Plan (SWMP)
Ocean Vista Estates
APN: 203-144-01
Site Plan and BMP Drawing
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Storm Water Management Plan (SWMP)
Ocean Vista Estates
APN: 203-144-01
ATTACHMENT C
Hydrology Calculation Tables
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
EXISTING CONDITIONS HYDROLOGY CALCULATIONS
Project: Ocean Vistas
Location: Ocean Street, Carlsbad
Storm Frequency: 100 Years
Area A=
Precipitation P6=
Length of Travel L=
Effective Slope S =
Time of Concentration Tc=
Runoff Coefficient C=
Intensity I =
Existing Site RUDoff Q=
0.64 Acres
2.5 Inches
237 Feet
3.8%
10.03 Minutes
0.42 Vacant lot
4.20 Incheslhour
1.12 cfs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
HYDROLOGY CALCULATIONS
Project: Ocean Vista Estates
Location: Ocean Street, Carlsbad
Date: July 22, 2004
Watershed Ar~a 1
Area (A) =
Travel Distance (L) =
Slope (S) =
Time of Concentration (Tc) =
Intensity (I) =
Runoff Coefficient (C) =
Designed Runoff (Q) =
Watershed Area 2
Area (A) =
Travel Distance (L) =
Slope (S) =
Time of Concentration (Tc) =
Intensity (1) =
Runoff Coefficient (C) =
Designed Runoff (Q) =
Watershed Area 3
Area (A) =
Travel Distance (L) =
Slope (S) =
Time of Concentration (Tc) =
Intensity (I) =
Runoff Coefficient (C) =
Designed Runoff (Q) =
Watershed Area 4
Area (A) =
Travel Distance (L) =
Slope (S)=
Time of Concentration (Tc) =
Intensity (1) =
Runoff Coefficient (C) =
Designed Runoff (Q) =
Watershed Area 5
Area (A) =
Travel Distance (L) =
Slope (S) =
Time of Concentration (Tc) =
Intensity (I) =
Runoff Coefficient (C) =
Designed Runoff (Q) =
0.22
210
2.0%
5.18
6.44
0.85
1.20
0.11
150
2.0%
5.00
6.59
0.85
0.62
0.11
150
2.0%
5.00
6.59
0.85
0.62
0.11
150
2.0%
5.00
6.59
0.85
0.62
0,08
35
1.0%
6.39
5.62
0.50
0.22
Precipitation (p6), = 2.5
Soil Classification: "D"
Storm Frequency: 100 years
Remarks
Acres R-3 Lot
Feet
. Minutes
IncheslHour
Urban Area Watershed
C.F.S. Runoff to Ocean St.
Acres PD Lot 1
Feet
Minutes (Calculated at 4.38 minutes)
IncheslHour
Urban Area Watershed
C.1;".S. Runoff to Ocean St.
Acres PDLot2
Feet
Minutes (Calculated at 4.38 n$utes).
IncheslHour
Urban Area Watershed
C.F.S. Runoff to Ocean St.
Acres PD Lot 3
Feet
Minutes (Calculated at 4.38 minutes)
IncheslHour
Urb~ Area Watershed
C.F.S. Runoff to Ocean St.
Acres PDLot3
Feet ..
Minutes
IncheslHour
Grass/Landscaping .
C.F.S. Runoff to Garfield St (sheet)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
ATTACHMENT D
Storm Water Management Plan (SwMP)
Ocean Vista Estates
APN: 203~144·(J1
85th Percentile Precipitation Map
"RECEIVED
Jut 22 2.005
ENG\NEERING DEPARiME.NT
I.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
----
San Diego County
85th Percentile Isopluvials
Draft 81712003
Legend
......... ,,0180_.
~~3~·l ~.
NO"<. Thoontlperc ... IIIotIl_1oH'IoUf1llIntdlglal. tlIOjlf .. HtlI ......... IIIdI~tBS%oIh
obIVored:lHou,,.IrI,,IIoLakoMlbelou IharlhlY~u.
DPW ~GIS
~.::==... • s:"J!i
:r-=~:.:;-~-"'",:
.:--:::.~-=
""":''::'::::=-'':::=-'::-
~ ...... ~....----
--
W*E s· I I I I I
024Miles
-- --
."
- ----- -- -
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
ATTACHMENT E
Formula Sheet
.Storm Water Management Plan (SWMP)
Ocean Vista Estates
. APN: 203-144"()1
I
I HYDROLOGY & HYDRAULIC REFERENCE FORMULA
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
TIME OF CONCENTRATION:
11 9'L 3 .385
JC= ( 'H )
Tc = 1.8(1.1-C) II
S1l3
INTENSITY (Ins./hr.):
I = 7.44 P 6 D -0.645
Natural 'vVatershed -County Dwg.: Appendex X-A
Where: Tc = Minutes + Initial 10 Minutes
L = Miles of Watershed Along Natural
Channel
H = Difference.in Elevation along .
effective slope Line .
Urban Area Overland Flow Fig. 3-5
'vVhere: Tc = Minutes .
C = Runoff Coefficient
L = Overland Travel Distance
S = Effective Slope (%)
Intensity-Duraton-Frequency -' County Design and
. Procedure Manual (Appendix XI-A)
. Where: 1= Int.ensity (ins./hr.) ,
P6 = 6 h.ours Precipitaton in (Ins.)
D = Duration in minutes
MANNING'S FOR PIPE: (Designed Runoff)
.Q = 0.4632 dB/3SI12
n
n
e = 2arccos (1-2D) d
Q =9. 739DrHe 1.5
Basic Formula,: For Capacity Calculation, S
should'be
Sf -for Pipe Flowing Full
So -for Pipe Partially Full
. Handbooks for Hydraulics by
Baxter & Kings
Pipe on channel flo\\'
EROSION CONTROL NOTES
1. IN CASE EMERGENCY WORK IS REQUlRED,CONTACT _____________ AT
_______ (PHONE NUMBER)
2. EQUIPMENT AND WORKERS FOR EMERGENCY WORK SHALL BE MADE AVAILABLE AT ALL
TIMES DURING THE RAINY SEASON. ALL NECESSARY MA TERIALS SHALL BE
STOCKPILED ON SITE AT CONVENIENT LOCA TlONS TO FACILITATE RAPID
CONSmUCTION OF TEMPORARY DEVICES WHEN RAIN IS EMINENT.
3. DEVICES SHOWN ON PLANS SHALL NOT BE MOVED OR MODIFIED WITHOUT THE APPROVAL
OF THE ENGINEERING INSPECTOR.
4. THE CONTRACTOR SHALL RESTORE ALL EROSION CON mOL DEVICES TO WORKING ORDER
TO THE SATISFACTION OF THE CITY ENGINEER AFTER EACH RUN-OFF PRODUCING
RAINFALL
5. THE CONmACTOR SHALL INSTALL ADDITIONAL EROSION CON mOL MEASURES AS MA Y BE
REQUIRED BY THE CITY ENGINEER DUE TO UNCOMPLETED GRADING OPERA TlONS OR
UNFORESEEN CIRCUMSTANCES WHICH MA Y ARISE.
6. THE CONTRACTOR SHALL BE RESPONSIBLE AND SHALL TAKE NECESSARY PRECAUTIONS TO
PREVENT PUBLIC mESPASS ONTO AREAS WHERE IMPOUNDED WATERS CREATE A
HAZARDOUS CONDITION.
7. ALL EROSION CONmOL MEASURES PROVIDED PER THE APPROVED GRADING PLAN SHALL
BE INCORPORA TED HEREON.
8. GRADED AREAS AROUND THE PROJECT PERIMETER MUST DRAIN AWAY FROM THE FACE OF
SLOPE A T THE CONCLUSION OF EACH WORKING DAY.
9. ALL REMOVABLE PROTECTIVE DEVICES SHOWN SHALL BE IN PLACE AT THE END OF EACH
WORKING DAY WHEN THE FIVE (5) DAY RAIN PROBABILITY FORECAST EXCEEDS FORTY
PERCENT (40%). SILT AND OTHER DEBRIS SHALL BE REMOVED AFTER EACH RAINFALL
10. ALL GRAVEL BAGS SHALL BE BURLAP TYPE WITH 3/4 INCH MINIMUM AGGREGRATE.
11. SHOULD GERMINATION OF HYDROSEEDED SLOPES FAIL TO PROVIDE EFFECTIVE COVERAGE
OF GRADED SLOPES (90% COVERAGE) PRIOR TO NOVEMBER 15, THE SLOPES SHALL BE
STABILIZED BY PUNCH smAW INSTALLED IN ACCORDANCE WITH SECTION 35.023 OF
THE EROSION AND SEDIMENT CONmOL HANDBOOK OF THE DEPARTMENT OF CONSERVATION,
STA TE OF CALIFORNIA
TEMPORARY EROSION CONTROL
PLANTING AND IRRIGATION
ALL PERMANENT AND TEMPORARY EROSION CON mOL PLANTING AND IRRIGA TlON SHALL BE
INSTALLED AND MAINTAINED AS REQUIRED IN SECTION 212 OF THE STANDARD
SPECIFICA TlONS AND THE FOLLOWING:
A. HYDROSEEDING SHALL BE APPLIED TO:
1. ALL SLOPES THA T ARE GRADED 6: 1 (HORIZONTAL TO VERTICAL) OR STEEPER
WHEN THEY ARE:
Q. THREE FEET OR MORE IN HEIGHT AND ADJACENT TO A PUBLIC WALL OR
SmEET.
b. ALL SLOPES 4 FEET OR MORE IN HEIGHT.
2. AREAS GRADED FLA TTER THAN 6: 1 WHEN ANY OF THE FOLLOWING CONDITIONS
EXIST:
Q. NOT SCHEDULED FOR IMPROVEMENTS(CONSmUCTION OR GENERAL
LANDSCAPING) WITHIN 60 DAYS OF ROUGH GRADING.
b. IDENTIFIED BY THE PARKS AND RECREATION DIRECTOR AS HIGHLY
VISIBLE TO THE PUBLIC.
c. HA VE ANY SPECIAL CONDITION IDENTIFIED BY THE CITY ENGINEER
THA T WARRANTS IMMEDIA TE mEA TMENT.
B. HYDROSEEDED AREAS SHALL BE IRRIGATED IN ACCORDANCE WITH THE FOLLOWING
CRITERIA:
C.
D.
E.
1. ALL SLOPES THAT ARE GRADED 6:1 OR STEEPER AND THAT ARE:
Q. THREE TO EIGHT FEET IN HEIGHT SHALL BE IRRIGA TED BY HAND
WATERING FROM QUICK COUPLERS/HOSE BIBS OR A CONVENTIONAL SYSTEM
OF LOW PRECIPITATION SPRINKLER HEADS PROVIDING 100% COVERAGE.
b. GREA TER THAN 8 FEET IN HEIGHT SHALL BE WA TERED BY A CONVENTION-
AL SYSTEM OF LOW PRECIPITA TlON SPRINKLER HEADS PROVIDING 100%
COVERAGE.
2. AREAS SLOPED LESS THAN 6: 1 SHALL BE IRRIGA TED AS APPROVED BY THE CITY
ENGINEER, PRIOR TO HYDROSEEDING. THE DEVELOPER SHALL SUBMIT A
PROPOSED SCHEME TO PROVIDE IRRIGATION TO THE CITY ENGINEER. THE
PROPOSAL SHALL BE SPECIFIC REGARDING THE NUMBERS, TYPES AND COSTS OF
THE ELEMENTS OF THE PROPOSED SYSTEM.
3. IRRIGA TlON SHALL MAINTAIN THE MOISTURE LEVEL OF THE SOIL A T THE
OPTIMUM LEVEL FOR THE GROWTH OF THE HYDROSEEDED GROWTH.
HYDROSEEDING MIX SHALL CONSIST OF ALL OF THE FOLLOWING:
1. SEED MIX SHALL CONSIST OF NO LESS THAN:
Q. 20 Ibs. PER ACRE OF ROSE CLOVER
b. 20 Ibs. PER ACRE OF ZORRO FESCUE
c. 3 Ibs. PER ACRE .OF E SCHOOL CIA CALIFORNICA
d. 4 Ibs. PER ACRE OF ACHILLEA MILLEFOLIA
e. 3 Ibs. PER ACRE OF ALYSSUM (CARPET OF SNOW)
f. 1/2 lb. PER ACRE OF DIMORPHOLECA
g. ITEMS c,d,e, AND f OF THIS SUBSECTION MAYBE OMITTED ON
LOCA TlONS WHERE THE AREA BEING HYDROSEEDED IS NOT VISIBLE FROM
EITHER A PUBLIC smEET OR RESIDENTIAL STRUCTURES.
h. ITEM Q OF THIS SUBSECTION MUST BE INOCULA TED WITH A NITROGEN
FIXING BACTERIA AND APPLIED DRY EITHER BY DRILLING OR
BROADCASTING BEFORE HYDROSEEDING.
I. ALL SEED MA TERIALS SHALL BE mANSPORTED TO THE JOBSITE IN
UNOPENED CONTAINERS WITH THE CALIFORNIA DEPARTMENT OF FOOD
AND AGRICULTURE CERTIFICATION TAG ATTACHED TO, OR PRINTED ON
SAID CONTAINERS.
j. NON-PHYTO-TOXIC WETTING AGENTS MA Y BE ADDED TO THE HYDROSEED
SLURRY AT THE DISCRETION OF THE CONmACTOR.
2. TYPE 1 MULCH APPLIED AT THE RATE OF NO LESS THAN 2000 Ibs PER ACRE.
TYPE 6 MULCH (smAW) MA Y BE SUBSTITUTED, ALL OR PART, FOR
HYDRAULICALL Y APPLIED FIBER MA TERIAL WHEN S1R4 W IS USED IT MUST BE
ANCHORED TO THE SLOPE BY MECHANICALL Y PUNCHNG NO LESS THAN 50% OF
THE STRAW INTO THE SOIL
3. FERTILIZER CONSISTING OF AMMONIUM PHOSPHATE SULFATE, 16-20-0, WITH
15% SULPHUR APPLIED A T THE RA TE OF 500 Ibs. PER ACRE.
AREAS TO BE HYDROSEEDED SHALL BE PREPARED PRIOR TO HYDROSEEDING BY:
1. ROUGHENING THE SURFACE TO BE PLANTED BY ANY OR A COMBINATION OF:
Q. mACK WALKING SLOPES STEEPER THAN 6: 1
b. HARROWING AREAS 6: 1 OR FLA TTER THA TARE SUFFICIENTLY FRIABLE.
c. RIPPING AREAS THA T WILL NOT BREAK UP USING ITEMS Q OR b ABOVE.
2. CONDITIONING THE SOILS SO THAT IT IS SUITABLE FOR PLANTING BY:
Q. ADJUSTING THE SURFACE SOIL MOISTURE TO PROVIDE A DAMP BUT NOT
SA TURA TED SEED BED.
b. THE ADDITION OF SOIL AMENDMENTS, PH ADJUSTMENT, LEACHING OR
COVERING SALINE SOILS TO PROVIDED VIABLE CONDI110NS FOR GROWTH.
HYDROSEEDED AREAS SHALL BE MAINTAINED TO PROVIDE A VIGOROUS GROWTH UNTIL
THE PROJECT IS PERMANENTLY LANDSCAPED OR, FOR AREAS WHERE HYDROSEEDING IS
THE PERMANENT LANDSCAPING, UNTIL THE PROJECT IS COMPLETED AND ALL BONDS
RELEASED.
• j •
• I
I I i __ L~ __ i
• I
• • I
I • I • I
• I
• • I
I • • r.q I
I ~
• I • I
t:I • I • I r.q
r.q
• I • I
• I
• I • I
'1
---------------------4---------.. -------------------------------------------
GARF ELD ST.
·b '.
LOT
9~SF
•
stOnED ~ ""","-,y
·b
..
50-----'---~
PDWTl I'D LOT 2 4,9Il4 SF 4,9Il4 SF
'"
~ L j:
OJRB &; GUTTER
""-"'ACE .."..TED
TO EXlS1ING so INlET
IN OCEAN ST. 0
""""""'"
. L ! -w=~.~~~~~~:jl:::::t==~~=:.t:~==:: r=-.w-.wf--w--w.l-a.-w-0-w-"-,,,-wl@-y,,,,-w-w-w1w o_o_o_w_o_w_o_o_o1-o_\l_o_o_w_w_o_o..1. 1-o_o_o_o_.1..._o_o_o_o_o_w_o_o_o_w_o_o_w_
(II UJ EX.. WATER ijAlN u>
~~y~~---7~-----~---------4--~-----------~------------+--------~.~------------------
DESCRIPTION
/ ~ UJ (II U>
"-"' ... _s_s _s_s_s_s_s~T~~~~~_s_s_s_s_s_s_sJs_sL.s-s-s-s-s-s-s-s_sls_s_s_s_s_s_s_s_s~s_s_s_s_s_s_s_s_s_s () s_s_s_s_s_s_s_s.
Pm DYIG.. 188--9 £XIST. SEWER lotH ~"-' _ _ .
20 0 10 Ki-. I !
LEGEND
QUANTITY
GRAPHIC SCALE
20 40
! I
( IN FEET )
1 inch = 20 ft.
Firm:
Nome:
80
I
ALTA CONSULTANTS
BARTOLOME J. PASTOR
STABIIJZED CONSTRUCTION ENTRANCE
1. SET POSTS AND EXCAVATE A
4 BY 4 IN (10 BY 10 CM)
TRENCH UPSLOPE FROM AND
ALONG IHE LINE OF POSTS.
2. STAPLE WIRE FENCING TO
IHE POSTS .
1t!:::::~~4 IN (10 CM)
3. ATTACH IHE RLTER FABRIC TO
IHE WIRE FENCE AND EXTEND IT
INTO IHE TRENCH.
4. BACKFILL AND COMPACT THE
EXCAVATED SOIL
Sn.T FENCE
GRAVEL BAGS OVERLAP
ONTO CURB
3 FT (0.9 M) MIN.
RUNOFF
GAP BETWEEN BAGS
ACTS AS SPILLWAY
IHREE LA YERS OF GRA VEL BAGS
WlIH ENDS OVERLAPPED
GRAVEL BAGS
CONSTRUCTION SITE ENTRANCES:
CONSTRUCTION SITE ENTRANCES SHALL BE PER CALIFORNIA
STORMWATER BMP HANDBOOK, STANDARD TC~I, MODIRED AS FOLLOWS:
METAL SHAKER PLATES WILL BE REQUIRED AT ALL LOCATIONS
UNLESS SPECIRCALL Y WAIVED BY IHE ENGINEERING INSPECTOR
DUE TO SITE CONSTRAINTS.
ROCK SIZE SHALL BE 2" MINUS.
A FENCE, BARRICADE OR OIHER DEVICE APPROVED BY IHE
ENGINEERING INSPECTOR SHALL BE USED TO RESTRICT
CONSTRUCTION TRAmc AT IHE CONSTRUCTION ENTRANCE.
STABU,TZED CONS'fRUCTION ENTRANCE
TC-l.
" AS BUILT"
RCE ____ _ EXP. _____ _ DATE
REVIEWED BY:
INSPECTOR DATE
Phone #:
FAX #:
4901 MORENA BLVD. # 409
'SAN DIEGO, CA., 92117
(858) 581-6101
(858) 581-6138 1-_-1-_-1-__________ -1-_-+-_+-_+----11 SH3EET 1 CITY OF CARLSBAD 1 SHE3ETS I
ENGINEERING DEPARTMENT ~E=RO=S=I=O~N=C=O=N=T=R=OL==P=LA=N=S==F=O=R:============~====~ Sll.T FENCE
GRAVEL BAGS
BARTOLOME J. PASTOR DATE:
RCE 38606, EXP. 3/31/2007
ALTA CONSULTANTS
PLANNING ENGINEERING SURVEYING
4901 Morena Blvd. ste. 409 San Diego, CA 92117 (858) 581-6101 Fax (858) 581-6138
.JOB NO. 257-05, DATED .JUNE 2, 2005
DATE INITIAl DATE INITIAL
ENGINEER OF WORK REVISION DESCRIPTION ornER APPROVAL
DATE INITIAL
CITY APPROVAL
OCEAN ESTATES PROJECT
OCEAN STREET
APPROVED
EXP 12/31/05
LLOYD B. HUBBS, CITY ENGINEER DATE
OWN BY: ALTA PROJECT NO. DRAWING NO.
CHKD BY: __ _
RVWD BY: CT 04-22 432-3A