HomeMy WebLinkAboutCDP 14-13; HIRSCHKOFF RESIDENCE; STORM WATER REQUIREMENTS; 2015-07-270
(CDP 14-13/CDP 14-14)
CITY OF CARLSBAD
ENGINEERING DIVISION
Standard Storm Water Requirements
FOR
HIRSCHKOFF RESIDENCE
Jefferson Street
ENGINEER OF WORK
VINCENT L. SAMPO - RCE 44173
PREPARED BY:
SAMPO ENGINEERING, INC.
171 SAXONY ROAD, SUITE 213
ENCINITAS, CA 92024
760-436-0660
Hirschkoff Residence
CDP 14-13/CDP 14-14
Standard Development Project 1
Sampo Engineering, Inc.
7/27/2015
TABLE OF CONTENTS
Project Setting
Applicable Storm Water Standards
Identified Pollutants of Concern
Source Control Measures
Lpw Impact Development (LID) Design Strategies
Integrated Management Practices (IMP's)
Documentation of Storm Water Design
BMP Facility Maintenance Requirements
SWMP Certification Statements
Attachments:
Storm Water Standards Questionnaire (SWSQ) E-34
BMP Exhibit
DMA Area Exhibit
Impervious Area Exhibit
Storm Drain Pipe Sizing Calculations
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 2
1.0 Project Setting
The subject property is located on the westerly side of Jefferson Street, approximately
600 feet north of the intersection with Las Flores Drive, in Carlsbad, California. The
property has an area of 0.281 acres and is legally described as a portion of Tract No. 2 of
Laguna Mesa Tracts, according to Map No. 1719 (APN: 155-180-28). The property is
bounded on the north by Carlsbad Road which is undeveloped but has not been vacated,
bounded on the east by Interstate 5, bounded on the west by a single-family residence and
bounded on the south by Jefferson Street.
The subject property is currently vacant. The property currently descends from the right-
of-way of Jefferson Street in a northerly direction to the rear slope of the property at an
average grade of 8.3%. From the top of the rear slope the property continues to descend
at a 1 Y2:1 gradient to the northerly property line. The northerly slope of the property is
considered environmentally sensitive and no disturbance of this area is proposed.
The owner proposes to develop the property with a new single-family residence, two
attached garages, pervious concrete driveway, permeable paver patios, planters and
landscaping. The subject property will share an existing driveway cut with the neighbor
to the west where there is an existing access easement in-place.
Per the County of San Diego Hydrology Manual's Soil Hydrologic Group Map the . project appears to have soil group B present. The soils reports from Engineering Design
Group, dated 6/19/13 supports this conclusion. A C factor of 0.55 is used per MDR
density of 10.9 DU/AS per table 3-1 of the San Diego Hydrology Manual.
In preparation of this report, Sampo Engineering, Inc. (SEI) reviewed the existing on-site
and off-site topography prepared by the owner's surveyor, additional off-site topography
obtained from the city web-site and the soil report prepared by Engineering Design
Group. SEI conducted a site visit and field reconnaissance on Tuesday April 8, 2014 to
verify existing drainage patterns and potential sources of pollution. Photos were taken of
the undeveloped project area, Jefferson Street and vegetation that currently exists.
SEI has prepared a preliminary Hydrology Study of the existing and proposed conditions,
the calculations and drainage maps, of which, are contained in a separate Drainage Study
submitted concurrent with this report.
No evidence of erosion was observed in the upper flatter portion of the property during
SEI's site visit of April 8, 2014. There was some localized erosion that was visible in the
steeper northerly portion of the site that is to be left undisturbed. Very little trash or
debris was observed on the property.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 3
1.1 Vicinity Map
Project
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1.2 Site Development Opportunities and Constraints
Common with any proposed development, the proposed project has its own unique
characteristics that present opportunities and constraints for storm water control and
treatment. Some constraints that are anticipated for the proposed development of the
project are based on the existing topography and underlying soil conditions. Due to the
environmentally sensitive and steep slope near the north and downstream end of the
property and soil engineering concerns about disturbing and replacing the slope, the
owner has decided not to pursue conveying storm water via a pipe or some other storm
drain system from the top of the slope to the bottom of slope near the northerly property
line. For this reason storm water will be treated on-site near the bottom of the building
pad and then pumped to Jefferson Street where it will be discharged into the Jefferson
Street gutter, where it will flow on the surface to an existing curb inlet at the northeast
corner intersection of Las Flores and Jefferson Street. The storm water is then conveyed
in an existing 18 inch diameter storm drain pipe to the west to the Buena Vista Lagoon.
Per the preliminary geotechnical report for the project infiltration is not recommended
since the proposed residence will sit atop an existing steep slope, and therefore for the
subject property. For this reason bio-retention basins and flow through planters will be
lined with impermeable membranes to prevent infiltration into the adjacent soils.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project
1.3 Nearby Water Bodies, Existing Storm Drain Systems
No existing public or private storm drain systems are located on or adjacent to the subject
property. Storm water draining from the property currently travels overland westerly to
the Buena Vista Lagoon before reaching the Pacific Ocean. None of the subject property
currently drains to Jefferson Street. There are two curb inlets located at the intersection of
Las Flores and Jefferson Street approximately 600 feet south of the subject property. It is
these two inlets that collect all storm water in Jefferson Street and the surrounding
neighborhood as shown in one of the attached drainage maps. The collected storm water
is then conveyed westerly to the shore of the Buena Vista Lagoon via an 18" diameter
ACP public storm drain.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 5
2.0 Applicable Storm Water Standards
The project has been determined to be classified as a Standard Development Project.
Although the property is located within 200 feet of an Environmentally Sensitive Area
(ESA) the project proposes less than 2500 square feet of impervious surfaces (the entire
driveway surface is proposed as permeable payers or some other permeable pavement).
Priority Project requirements do not apply to this project therefore Hydromodification
requirements also do not apply. Regardless, the project proposes LID and numerically
sized treatment control facilities for two bio-retention basins and two flow through
planters as shown on Drawing No. 486-2A and as supported by calculations herein.
Please see attached Storm Water Standards Questionnaire (E-34).
S
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Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 6
S 3.0 Identified Pollutants of Concern
The project proposes to redevelop the property by constructing a new single-family
residence, two attached garages, permeable paver driveway, planters and landscaping.
Pollutants anticipated for this type of land use are sediment, nutrients, trash & debris,
oxygen demanding substances, oil & grease, bacteria & viruses, and pesticides.
The project lies within the Carlsbad Watershed in the Buena Vista Creek Hydrologic
Area (904.2). Storm water from the site drains to the Buena Vista Lagoon before
reaching the Pacific Ocean.
The Buena Vista Creek is listed as an impaired water body per 303d listing for indicator
bacteria, nutrients, and sedimentation/siltation.
The Buena Vista Lagoon has many beneficial uses including public trails surrounding the
lagoon, and fishing.
Indicator bacteria, nutrients, and sediment are primary pollutants-of-concern for the
proposed project and shall be mitigated with bio-retention basin and flow through planter
BMP's.
S
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 7
S 4.0 Source Control Measures
Source Control BMP's consist of scheduling of activities, prohibition of certain practices,
maintenance procedures, and education to prevent storm water pollution by reducing the
potential for contamination at the source. Proper site planning, land use, and structural or
nonstructural measures can achieve this.
POTENTIAL
SOURCE OF PERMANENT SOURCE OPERATIONAL SOURCE CONTROL
RUNOFF CONTROL BMP'S BMP'S
POLLUTANTS
A. On-site storm Mark all inlets with the words, "No Maintain and periodically repaint
drain inlets Dumping! Flows to Ocean" or replace inlet markings.
Provide storm water pollution
prevention information to new site
owners, lessees, or operators.
See applicable operational BMP's
in Fact Sheet SC-44, "Drainage
System Maintenance," in the
CASQA Handbook.
B. Need for future Buildings designed to discourage Provide Integrated Pest
indoor & structural entry of pests Management information to
pest control owners, lessees, and operators.
C. Landscape! Final Landscape Plans shall: Maintain landscaping using
Outdoor Pesticide Preserve existing native minimum or no pesticides.
Use trees, shrubs, and ground See applicable operational BMP's
cover to the maximum in Fact Sheet SC-4 1, "Building and
extent practical. Grounds Maintenance," in the
Design landscaping to CASQA Stormwater Quality
minimize irrigation and Handbook
runoff, to promote surface Provide IPM information to new
infiltration where owners, lessees, and operators. - appropriate, and to
minimize the use of
fertilizers and pesticides
that can contribute to
storm water pollution.
Where landscaped areas
are used to retain or detain
storm water, specify plants
that are tolerant of
saturated soils conditions.
Consider using pest
resistant plants, especially
adjacent to hardscape.
To insure successful
establishment, select
plants appropriate to site
soils, slopes, climate, sun,
wind, rain, land use, air
movement, ecological
consistency, and plant
interactions.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project
POTENTIAL OPERATIONAL SOURCE
SOURCE OF PERMANENT SOURCE CONTROL BMP'S CONTROL BMP'S
RUNOFF
POLLUTANTS
D. Refuse Areas Site refuse to be handled in covered Adequate number of receptacles
trash cans in garage. to be located on site, inspected
Signs will be posted on or near for leaks regularly, and covered.
dumpsters with the words, "Do not Any spills to be cleaned up
dump hazardous materials here." immediately.
E. Vehicle and Car wash area not provided on-site. No Not Applicable
Equipment facilities will be made available.
Cleaning
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project
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5.0 Low Impact Development (LID) Design Strategies
The project proposes to redevelop the property by constructing a new single-family
residence and attached garage, driveway, and planters on a property that is classified as a
"Standard Development Project". The proposed development utilizes Low Impact
Development (LID) principles to the Maximum Extent Practical. The project proposes to
utilize an existing previously graded pad area on-site to construct the residence and
improvements. Although no natural landforms exist since the site has been previously
graded, the project proposes to optimize the site layout by minimizing additional
impervious areas of the single-family roof envelope and constructing the entire driveway
of permeable payers to further minimize the site's total impervious area. Landscaping or
ground cover will be used outside of the residence and driveway to prevent erosion of the
surface of the soil and slopes, enhance moisture retention, and inhibit the growth of
weeds. Optimization of site layout was achieved by preserving and minimizing ground
disturbance of an existing on-site environmentally sensitive slope. This project also
implements flow through planters as a storm water treatment and pump system that
conveys treated storm water runoff from the lower pad to the existing curb and gutter, in
Jefferson Street, in an effort to prevent runoff from eroding the rear slope.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 10
6.0 Integrated Management Practices (IMP's)
Following the City of Carlsbad Standard Urban Storm Water Management Plan
(SUSMP) there are 4 flow through planters designed to satisfy storm water quality
standards for treatment control. The DMA's for each IMP consist of Roof/Hardscape,
Permeable Payers, Landscaping, and the IMP itself. The DMA Runoff Factors for all
tributary Roof/Hardscape, Permeable Payers and Landscaping, and IMP are 1.0, 0.1, and
0 respectively per Table 4-2 of SUSMP. The IMP sizing factor for each IMP is 0.4 per
Table 4-6 of SUSMP for Flow-through Planters.
Summary:
The designed IMP'sare as follows:
IMP 1 is a flow through planter 23 SF in treatable area located near the
southeasterly corner of the property. IMP 1 is designed to treat storm water runoff
from DMA 1 which has a tributary area of 1,262 SF. Refer to IMP size
calculations and DMA Exhibit for in-depth calculations.
IMP 2 is a flow through planter 28 SF in treatable area located near the
northeasterly corner of the new residence. IMP 2 is designed to treat storm water
runoff from DMA 2 which has a tributary area of 2,916 SF. Refer to IMP size
calculations and DMA Exhibit for in-depth calculations.
IMP 3 is a flow through planter 35 SF in treatable area located near the northerly
property line and northwesterly of the new residence. IMP 3 is designed to treat
storm water runoff from DMA 3 which has a tributary area of 1,196 SF. Refer to
IMP size calculations and DMA Exhibit for in-depth calculations.
IMP 4 is a flow through planter 40 SF in treatable area located near the
southwesterly building corner. IMP 4 is designed to treat storm water runoff from
DMA 4 which has a tributary area of 1,331 SF. Refer to IMP size calculations and
DMA Exhibit for in-depth calculations.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 11
S
7.0 Documentation of Storm Water Design
To satisfy storm water quality standards for treatment control the project proposes the use
of Integrated Management Practices (IMP's). The IMP's are sized for treatment only
since Hydromodification is not required. The project site has been divided into four
Drainage Management Areas (DMA's) and each DMA drains to one IMP area for storm
water treatment and flow control (see attached DMA Site Plan). The following tables
show the complete calculations and sizing factors used to size the proposed IMP's.
DMA Code: I Total Basin Area: 1,262 SF
DMA Description: Southwesterly portion of property tributary to the southwesterly flow through
planter.
DMA
Post Project Area Runoff
Surface Type (SF) factor
Roof/Hardscape 341 1.0
Permeable Payers 744 0.1
Landscaping 177 0.1
IMP area 23 0
Total
DMA area
x runoff
factor B Flow Through Planter
341
74
18
0 IMP Sizing
factor (WQ Minimum Proposed
only) Area Area
433j 0.041 171 23
DMA Code: 2 Total Basin Area: 2,916 SF
DMA Description: Southeast portion of property tributary to the southeasterly flow through
planter.
Soil Type: IMP type
DMA DMA area
Post Project Area Runoff x runoff
Surface Type (SF) factor factor B Flow Through Planter
Roof/Hardscape 427 1.0 427
Permeable Payers 1829 0.1 183
Landscaping 660 0.1 66
IMP area 30 0 0 IMP Sizing
factor (WQ Minimum Proposed
only) Area Area
Total I 676 I 0.04 I 27 I 28
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 12
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DMA Code: 3 Total Basin Area: 1,191 SF
DMA Description: Northeasterly portion of property tributary to north easterly flow through
planter.
Soil Type: IMP type
DMA DMA area
Post Project Area Runoff x runoff
Surface Type (SF) factor factor B Flow Through Planter
Roof/Hardscape 846 1.0 846
Permeable Payers 119 0.1 12
Landscaping 226 0.1 23
IMP area 35 0 0 IMP Sizing
factor(WQ Minimum Proposed
only) Area Area
Total 881 0.04 35 I 35
DMA Code: 4 Total Basin Area: 1,331 SF
DMA Description: Northwesterly portion of property tributary to northwesterly flow through
planter.
Soil Type: IMP type
DMA DMA area
Post Project Area Runoff x runoff
Surface Type (SF) factor factor B Flow Through Planter
Roof/Hardscape 852 1.0 852
Permeable Payers 18 0.1 2
Landscaping 461 0.1 46
IMP area 37 0 0 1 ,o JIL.Il l
factor (WQ Minimum Proposed
only) Area Area
Total 900 0.04 1 36 1 40
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 13
8.0 BMP Facility Maintenance Requirements
The City Engineer will not consider structural Treatment Control BMPs and LID IMPs as
meeting the maximum extent practicable standard (MEP), unless the applicant identifies a
specific maintenance mechanism and implements a storm water operation and
maintenance plan (O&M Plan) to ensure ongoing long-term inspection and maintenance
of all structural Treatment Control BMPs and IMPs. This mechanism shall be proposed
by the applicant as part of the SWMP. Processing an O&M Plan is among the
requirements to obtain a grading permit during the final engineering phase of a Priority
Development Project.
The SWMP identifies one of the following Priority Development Project maintenance
mechanisms to ensure long-term facility maintenance.
A supporting O&M Plan has been developed and is located in the attachments section of
this report.
- Maintenance Mechanism
Conditional use permits - For discretionary projects only, the City may assure maintenance E of storm water BMPs through the inclusion of maintenance conditions in the conditional use
permit. A non-refundable security may be required.
Project proponent agreement to maintain storm water BMPs - The City may
enter into a contract with the project proponent obliging the project proponent to maintain, repair
and replace the storm water BMP as necessary into perpetuity. A non-refundable security may be
required.
Conditional use permits - For discretionary projects only, the City may assure El maintenance of storm water BMPs through the inclusion of maintenance conditions in the
conditional use permit. A non-refundable security may be required.
Lease provisions - In those cases where the City holds title to the land in question and the E land is being leased to another party for private or public use, the City may assure storm water
BMP maintenance, repair and replacement through conditions in the lease.
Assessment districts - The City may approve an Assessment District or other funding
El mechanism created by the project proponent to provide funds for storm water BMP maintenance,
repair and replacement on an ongoing basis. Any agreement with such a District shall be subject to
the Public Entity Maintenance Provisions below.
Public entity maintenance - The City may approve a public or acceptable quasi-public
entity (e.g., the County Flood Control District, or annex to an existing assessment district, an
existing utility district, a state or federal resource agency, or a conservation conservancy) to assume
responsibility for maintenance, repair and replacement of the BMP. Public entity maintenance
agreements shall ensure estimated costs and front-funded or reliably guaranteed, (e.g., through a
trust fund, assessment district, fees, bond, letter of credit or similar means). In addition, the City
may seek protection from rliability by appropriate releases and indemnities. The City Engineer shall
have the authority to approve storm water BMPs proposed for transfer to any other public entity
within its jurisdiction before installation. The City shall be involved in the negotiation of
maintenance requirements with any other public entities accepting maintenance responsibilities
within their respective jurisdictions; and in negotiations with the resource agencies responsible for
issuing permits for the construction and/or maintenance of the facilities. The City must be
identified as a third party. beneficiary empowered to enforce any such maintenance agreement
within their respective jurisdictions.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 14
Alternative mechanisms - The City may accept alternative maintenance mechanisms if E such mechanisms are as protective as those listed above. Alternative mechanisms must be approved
by the City Attorney and the City Engineer.
Comment: The Applicant will enter maintenance agreement with the City to satisfy storm water
maintenance requirements.
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 15
9.0 SWMP Certification Statements
The selection, sizing, and preliminary design of storm water treatment and other control
measures in this plan meet the requirements of Regional Water Quality Control Board
Order R9-2007-0001 and subsequent amendments.
I understand and acknowledge that the plan check review of the Storm Water Mitigation
Plan by the City of Carlsbad is a review for the limited purpose of ensuring the Plan and
design complies with requirements of the City, Regional Water Quality Control Board,
San Diego Region, and other applicable policies and ordinances. The review of this plan
by City Staff is not a determination of the technical adequacy of the design of Storm
Water Mitigation Plan. Such review of the Plan does not relieve me of my responsibility
for the design and content of the Storm Water Mitigation Plan.
Hirschkoff Residence (CDP 14-13/14-14)
44173 8/7/1
Vincent L. Sampo PE No. Date
Engineer-of-Work
Sampo Engineering, Inc.
171 Saxony Road, Suite 213
Encinitas, CA 92024
S
Hirschkoff Residence Sampo Engineering, Inc.
CDP 14-13/CDP 14-14 7/27/2015
Standard Development Project 16
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CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
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seek assistance from Land Development Engineering staff.
•
A separate completed and signed questionnaire must be sub
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for the project.
Please start by completing Step I and follow the instructions. Whe
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- - -- --
_____ - -
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I • -
To determine if your project is a priority development project, please answer the
f
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:
YES NO Is your project LIMITED TO constructing new or retrofitting paved
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the following criteria: (1) Designed and constructed to direct storm water r
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accordance with USEPA Green Streets guidance?
Is your project LIMITED TO retrofitting or redeveloping existing paved
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If you answered "no" to both questions, then go to Step 2.
101
E-34 Page 1 of 3 Effective 6127/13
CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Develooment Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
-
STEP2 - TO BE COMPLETED'PORAtL?NEW EN ROJ
To determine if your project is a priority development project, please answer the following questions:
YES NO
Is your project a new development that creates 10,000 square feet or more of impervious surfaces collectively
over the entire project site? This includes commercial, industrial, residential, mixed-use, and public X development projects on public or private land.
Is your project creating or replacing 5,000 square feet or more of impervious surface collectively over the entire
project site on an existing site of 10,000 square feet or more of impervious surface? This includes commercial, industrial, public development projects on_ public private land.
_residential, _mixed-use,_and _or Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface
collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared
x foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared
foods and drinks for immediate consumption.
Is your project a new or redevelopment project that creates. 5,000 square feet or more of impervious surface
collectively over the entire project site and supports a hillside development project? A hillside development project includes development on any natural slope that is twenty-five percent or greater. X
Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface
X collectively over the entire project site and supports a parking lot. A parking lot is a land area or facility for the temporary parkingor storage of motor vehicles personally for business or for commerce.
_used
Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface
collectively over the entire project site and supports a street, road, highway freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of
automobiles, trucks, motorcycles, and other vehicles.
Is your project a new or redevelopment project that creates or replaces 2,500 square feet or more of
impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive
Area (ESA)? "Discharging Directly to' includes flow that is conveyed overland a distance of 200 feet or less X from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the
project to_ the commingles lands).*
_ESA _(i.e._not _with _flows _from _adjacent
Is your project a new development that supports an automotive repair shop? An automotive repair shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, X 5014, 5541, 7532-7534, or 7536-7539.
Is your project a new development that supports a retail gasoline outlet (RGO)? This category includes RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADT) of
100 or more vehicles per day.
Is your project a new or redevelopment project that results in the disturbance of one or more acres of land and
are expected to generate pollutants post construction? X
Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
X impervious _surface _or (2)_ increases _impervious _surface on_ the _property _by_ more _than _10%?
If you answered "yes" to one or more of the above questions, you ARE a priority development project and are therefore subject to
implementing structural Best Management Practices (BMP's) in addition to implementing Standard Storm Water Requirements such
as source control and low impact development BMP's. A Storm Water Management Plan (SWMP) must be submitted with your
application(s) for development. Go to step 3 for redevelopment projects. For new projects, go to step 4 at the end of this
questionnaire, check the "my project meets PDP requirements" box and complete applicant information.
you answered "no" to all of the above questions, you ARE NOT a priority development project and are therefore subjec
t
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nplementing only Standard Storm Water Requirements such as source control and low impact development BMP's required for al
l
evelopment projects. A Storm Water Management Plan (SWMP) is not required with your application(s) for development. Go to step
at the end of this questionnaire, check the "my project does not meet PDP requirements" box and complete applicant
formation.
E-34 Page 2 of 3 Effective 6/27113
CITY OF.
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1.635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
the result In the creation or
In an amount of less than
If you answered 'yes,R the structural BMP's required for Priority D
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Applicant information and Signature Box
Address:
WY $ Applicant Name:
- Applicant Signature: '
-
Accessor's Parcel Number(s):
.55-180-28
______ Applicant Title:
Date:
This Box for City Use Only
Environmentally Sensitive Areas Include but are not limited to all Clean Water
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E-34
Page 3 of 3 Etfective8/27113
EAS7ELY(TK( OF PR! VA IF WAL Ufl
1990 Na I990-5$4 OR. ---
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5.74 ,
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1"=20' — -
0 10 20 40
— - CITY OF CARLSBAD I[SHEETS
—
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ENGINEERING DEPARTMENT i I E — SINGLE SHEET BMP SITE PLAN UJ
HIRSCHKOFF RESIDENCE
- APN: 155-180-28 W
2
RECORD COPY I[ PROJECT NO. — -
COP 14-13/14-14
DRAWING NO. - DATE IN171AL DATE I INITIAL
INITIAL DATE ] 486-2A .4_. OTHER APPROVAL CITY APPROVAL
BMP TABLE
BMPID# BMP TYPE SYMBOL CASQA NO. QUANTITY DRAWING NO. INSPECTION * SHEET NO(S) FREQUENCY
MAINTENANCE *
FREQUENCY
TREATMENT CONTROL
0 PERVIOUS
PAVEMENT
I LLLLI
rLLLLI TC-10 2992 SF. 486-2A 4,5 SEMI-ANNUALLY ANNUALLY
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FLOW-THROUGH
PLANTER M.
TC-32 111 SF. 486-2A 45 QUARTERLY SEMI-ANNUALLY
LOW IMPACT DESIGN (L.I.D.)
® ® ROOF DRAIN TO
LANDSCAPING SD-Il 9EA. 486-2A 4,5 ANNUALLY ANNUALLY
-
VEGETATIVE -'- TC-30 115LF. SWALE
486-2A 3,4 ANNUALLY MONTHLY
ENGINEER OF REViSION DESCRIPTION
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_-_•&._rn--. _..çfr - ______________________
LETIND SWRI
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OUTFALL LOCA liONS
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TRIBUTARY AREA= 2,916 SF
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I PER VIOUS= 2489 SF )
0 10 20 40 '
UMII fli IA )7
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IMPERVIOUS AREA= 8465F
PERVIOUS= 345 SF 1 •--
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822-46
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4 DMA
-- -P- TRIBU TA R Y A REA = 1,262SF
) IMPERVIOUS AREA= 341 SF
/
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PER VIOUS= 921 SF
DMA 4
TRIBUTARY AREA = 1,331 SF
IMPERVIOUS AREA= 852 SF I -
PERVIOUS= 4795F 6
N -- -- -'
/- \ / 2
/ N
- •• CITY OF CARSLBAD
DRAINAGE MANAGEMENT AREAS FOR
- HIRSCHKOFF RESIDENCE
--
VACANT PROPERTY ON JEFFERSON ST
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1483 CORAL WAY
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ShE ADDRESS VACANT PROPERTY ON JEFFERSON STREE T, CARLSBAD CA.
ASSESSOR'S PARCEL NO.: 155-180-28
C/) 4
55)
I* STORM DRAIN PIPE SIZING CALCULATIONS
SIZE STORM DRAIN PIPE LEAVING DMA 1:
Qtoo DMA I = C I A = 1(341_SF)(.95)-4-(921)(.35)1(6.59 IN/HR)11262 )= 0.098 CFS
1262 J L43560 J
TO = 5 MIN. BY INSPECTION => !!&H 7.44 (5 min)-.645 (2.5) = 6.59
Capacity of a 4" PVC at 5% slope mm.
D ) 8/3 s 1/2 = 49 (0.33)813 ( 0.05 )1/2 = 0.526 CFS
n .011
Qcap = 0.526 CFS> Qinn DMA I = 0.098 CFS . Use 4" PVC Storm drain at 5% min from DMA 1 flow through planter to 6"
PVC rear yard storm drain.
SIZE STORM DRAIN PIPE LEAVING DMA 2:
Qioo DMA 2 = CIA= [427 SF.95+(2489.35) 6.59 IN/HR) _ p2916 = 0.193 CFS
~7 101
2916
= 5 MIN. BY INSPECTION => !12L= 7.44 (5 mm)-645 (2.5) = 6.59
Capacity of a 4" PVC at 5% slope mm.
Qca = k ( D ) 8/3 5 1/2 = .498 (0.33)8/3 ( 0.05 )1/2 = 0.526 CFS
n .011
Qcap = 0.526 CFS> Qinn DMA 2 = 0.193 CFS
Use 4" PVC Storm drain at 5% min from DMA 2 flow through planter to storm
drain sump pump.
Hirsch koff Residence
CDP 14-13, CDP 14-14 Sampo Engineering, Inc.
Standard Development Project 7/27/2015
STORM DRAIN PIPE SIZING CALCULATIONS
SIZE STORM DRAIN PIPE LEAVING DMA 3:
Qioo DMA 3 = CIA= 1(846 SF)(.95)f(345)(.35))6.59 IN/HR)11191 )= 0.140 CFS
L 1191 J L43560 J
= 5 MIN. BY INSPECTION => 112L= 7.44 (5 min)-.645 (2.5) = 6.59
Capacity of a 4" PVC at 1% slope mm.
Qcap = k ( D ) 8/3 S 1/2 = A (0.33)8/3 ( 0.05 )1/2 = 0.235CFS
n .011
Qcap = 0.235 CFS> Qinn DMA 3 = 0.140 CFS
Use 4" PVC Storm drain at 1% min from DMA 3 flow through planter to 6"
PVC rear yard storm drain pipe.
SIZE STORM DRAIN PIPE LEAVING DMA 4:
Qioo DMA 4 = CIA= f(852 SF)(.95)+(479)(.35) 'k6.59 IN/HR)11331 )= 0.148 CFS
1331 J L43560J
TO = 5 MIN. BY INSPECTION => !120 —E 744 (5 min)-.645 (2.5) = 6.59
Capacity of a 4" PVC at 1% slope mm.
Qca = k ( D ) 8/3 S 1/2 = .498 (0.33)8/3 ( 0.01 )1/2 = 0.235 CFS
n .011
Qcap = 0.235 CFS> Qign DMA 4 = 0.148 CFS
Use 4" PVC Storm drain at 1% min from DMA 4 flow through planter to 6" 0 PVC rear yard storm drain sump pump.
Hirschkoff Residence
CDP 14-13, CDP 14-14 Sampo Engineering, Inc.
Standard Development Project 7/27/2015
STORM DRAIN PIPE SIZING CALCULATIONS
SIZE STORM DRAIN PIPE FOR REAR YARD
Capacity of a 6" PVC storm drain at 1% slope mm. Pipe will collect water from flow through planters in
DMA 1,3, 4, and overflow runoff from rear yard catch basins. Rear yard is considered self treating for
storm water quality purposes and catch basins will be built to allow ponding and percolating.
Ocap = k ( R ) 8/3 S 1/2 = A98 (0.50)8/3 (0.01)1/2 = 0.713 CFS
n .011
Q DMA Totals = DMA 1+ DMA 3+ DMA 4=0.098+o.140+O.148 = 0.386 CFS
Qcap6" PVC = 0.713 CFS > QDMA Total = 0.386 CFS
Use 6 PVC Storm drain at 1% min from the most westerly rear yard catch
basin northeasterly to storm drain sump pump.
NOTE: see following page for storm drain sump and pump
calculations performed by pluvia consulting
Hirschkoff Residence
CDP 14-13, CDP 14-14 Sampo Engineering, Inc.
Standard Development Project 7/27/2015
•
S
7 14
JOB: Hirschkoff Residence
SHEET NO. 1 OF 1 CALCULATED BY: S. Sekeogtu DATE: February 13, 2015 JOB NUMBER: 005001
FILENAME:
Storm Water Pump Station Sizing Calculations:
The calculations below are for determining the expecte
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for the Hirschkoff Residence project.
Knowns:
Project comprises a total I singlefamily unit with a
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the Jefferson Street, therefore, these units will be serv
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Per the hydrology study prepared by Sampo Engin
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Q-10 0.36 cfs
Q-100 0.57 cfs
System Head Curve shall be developed based on Haze
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Storm water sump invert elevation: I.E. 58.4 AMSL
Proposed Discharge at the cleanout Inver eletavion I.E.
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Comments:
The storm water from the property will be collected in t
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Hirschkoff Residence
Carlsbad, California
STORM WATER PUMP STATION
CALCULATIONS
Wet Well Calculations:
Manhole Diameter = 4 ft Calculated Specific Volume 12.6 Cu. ft.! ft.
No of Duty Pumps = I total pumps No of Standby Pumps I total pumps Max. # of Pump Cycles = 10 per hr per pump
10 total per hr Mm. Req'd Oper. Volume = 51.3 ft' Mm. Req'd Oper Vol = OpT/4
Where, T = 60 minutes/Max U of Total Cycles per Hour Max. Wet Well Storage Time 5 Minutes
Max. Wet Well Volume = 106.0 to Max Vol = Qa • Max. Wet Welt Storage Time
Operating Volume Selected 48.0 ft3 Active Depth = 3.8 ft Active Depth = Oper Vol. Selected/ Ceic. Specific Vol.
.1
Project Name: Hirschkoff Residence
Client: S Joel Hirschkoff
Pluvia Job No. 005001
Location/System: Submersible Sewer Grinder Pump (Wet well to discharge to cleanout)
Wet Well Hydraulic Calculations
110 yr Storm Flow (a10) = 0.36 ft/sec I,
1100 yr Flow (Q) = 0.57 ft3 Isec
Design Pump Flow (Q) = 0,57 ft/sec
256.50 gpm
Force Main Flow Calculations
Pipe Material, PVC
Pipe Diameter = 6.00 in Pipe Area 0.196 ft3 Flow = 0.570 ft?/sec Calculated Velocity = 2.90 ft/sec
Force Main
Force Main Length 194 ft Force Main Volume = 38.1 ft3
= 293981
Note: The maximum velocity to avoid excessive friction head loss is 6 ft/sec.
Pump Cycling Frequency
10-yr Flow Time to Fill = 2.22 mm 10-yr Flow Time to Pump Down = 3.81 mm Avg. Flow Total Cycle Time 6.03 min or 9.95 cycles/hr
Peak Flow Time to Fill 1.40 mm
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