HomeMy WebLinkAboutCDP 2020-0027; HYDROLOGY STUDY; 2021-04-27Hydrology Study
5511 Los Robles Drive
Carlsbad, CA 92008
Chestnut Avenue Residence
DEV 2020-0143
CDP 2020-0027
Prepared for:
Arvin & Sepideh Matthew
215 Montair Drive
Danville, CA 94526
Prepared By:
John P. Strohminger RCE 55187
dba Pacific Overland Engineering & Surveying
635 Via Columbia
Vista, CA 92081
Date: April 27, 2021
April 27, 2021
John P. Strohminger RCE 55187 Date
1
I TABLE OF CONTENTS
2 Project Description................................................................................................................................2
2.1 Existing Condition .........................................................................................................................2
2.2 Proposed Condition ......................................................................................................................3
2.3 Soil Characteristics........................................................................................................................3
3 Rational Method Description................................................................................................................3
4 Hydrology Analysis................................................................................................................................4
5 Water Quality........................................................................................................................................4
6 Hydromodification ..................
.
.......
.
....................................................................................................... 5
7 Conclusion.............................................................................................................................................
8 Attachments ........................................................................................................................................... 5
9 References ............................................................................................................................................5
2 PROJECT DESCRIPTION
This project is a 0.236 acre residential parcel located at 5511 Los Robles Drive in the City of Carlsbad. It
is a corner lot fronting Los Robles Drive with Manzano Drive on the south. Both streets are public.
Manzano Drive connects with Carlsbad Boulevard to the west although access is blocked by City
barricades. To the north and west are private single-family houses. The existing site was graded and a
single family house and accessory building constructed sometime in the 1970's. The existing structures
will be demolished. Proposed improvements consist of a single-family detached dwelling unit, an
attached accessory dwelling unit, and driveway. No street improvements are proposed. The site's APN
number is 210-4546-14-00. The legal description is Lot 210 of Map 4064. The Zoning is R-1, Medium
Density Residential. A Vicinity Map is in the attachments.
2.1 ExIsTING CONDITION
The existing site has a graded pad and a single-family geodesic dome residence, an accessory building
and driveway at an average elevation of 63 feet above Mean Sea Level (MSL). The elevation of the Street
fronting the property is at 62 feet MSL. The grades on Los Robles Drive carries storm water to the north.
To the south side along Manzano Drive the grade slopes to the west carrying storm water toan inlet on
Carlsbad Boulevard. To the west are two existing single-family residences four to six feet lower than the
proposed structure. To the north is an existing single family residence at the same grade as the
proposed structure.
2
Storm water from the site surface flows to the adjacent streets. From there is continues to an inlet at
Carlsbad Boulevard and Manzano Drive or runs on the surface along Los Robles Drive to the north.
2.2 PROPOSED CONDITION
The proposed project creates a single-family residence and attached accessory dwelling unit with a
driveway, patio, and front, side, and rear yard hardscape and landscape. The improvements and grading
will disturb 12,850 square feet of area. The amount of new and replaced impervious surface will be
4,999 square feet. The new drainage pattern is similar to the existing drainage pattern. Initial storm
water begins at a high point on the north side yard. From there it is flows to Manzano Drive or Los
Robles Drive.
2.3 SOIL CHARACTERISTICS
The following soil group definitions come from Technical Release 55 (TR-55) by the United States
Department of Agriculture:
Group A soils have low runoff potential and high infiltration rates even when thoroughly wetted. They
consist chiefly of deep, well to excessively drained sand or gravel and have a high rate of water
transmission (greater than 0.30 in/hr).
Group B soils have moderate infiltration rates when thoroughly wetted and consist chiefly of moderately
deep to deep, moderately well to well drained soils with moderatelyfine to moderately course textures.
These soils have a moderate rate of water transmission (0.15-0.30 in/hr).
Group C soils have low infiltration rates when thoroughly wetted and consist chiefly of soils with a layer
that.impedes downward movement of water and soils with moderately fine to fine texture. These soils
have a low rate of water transmission (0.05-0.15 in/hr).
Group D soils have high runoff potential. They have very low infiltration rates when thoroughly wetted
and consist chiefly of clay soils with a high swelling potential, soils with a permanent high water table,
soils with a clay pan or clay layer at or near the surface, and shallow soils over nearly impervious
material. These soils have a very low rate of water transmission (0-0.05 in/hr).
The conservative approach is assuming Group D soils for the site
3 RATIoNAt. METHOD DESCRIPTION
The rational method, as described in the 2003 San Diego County Hydrology Manual, was used to
generate surface runoff flows, which were then used to size the drainage facilities.
The basic equation: Q = CiA
Q = Peak Flow of Storm Water in Cubic Feet per Second (cfs)
C= runoff coefficient (varies with land use)
3
= Intensity (in/hr)
A = Area (acres)
The 6 hour and 24 hour rainfall isopluvial maps are found in the 2003 San Diego County Hydrology
Manual. Adjusted P6 calculations can be found in the Attachments. Initial travel time calculations (Ti) are
set on a minimum 5 minutes as prescribed by the City and County.
4 HYDROLOGY ANALYSIS
The table below summarizes the pre- and post-construction 100-year flows. The outfall points are
shown on the Existing and Proposed Drainage Exhibits included in this report.
Description A (ac) Q (cfs)
Existing 100-Yr Node #101 0.105 0.37
Existing 100-Yr Node #111
0.190 0.68
Proposed 100-Yr Node #201 0.099 0.35
Proposed 100-Yr Node #211
0.196 0.60
Table 1 Summary of existing and proposed stormwater runoff.
In the existing condition the flow onto Los Robles Drive at Node 101 is 0.37 cfs. In the proposed
condition the flow onto Los Robles Drive at Node 201 is 0.35 cfs. This is a 0.02 cfs reduction in peak flow
to Los Robles Drive due to the smaller basin area.
In the existing condition the flow onto Manzano Drive at Node 111 is 0.68 cfs. In the proposed condition
the flow onto Manzano Drive at Node 211 is 0.60 cfs. This is a 0.05 cfs reduction in peak flow to
Manzano Drive due to routing through a long 2% swale.
The Analysis and Exhibit for the pre-development condition and for the post-development condition is in
the Attachments.
5 WATER QUALITY
This project is a Standard Development Project per the completed Storm Water Standards
Questionnaire (E-34) provided in the attachments. This project is therefore not required to submit a
Storm Water Quality Management Plan (SWQMP).
4
6 HYDRoMoDIFIcATIoN
This project is exempt from Hydromodification requirements since it is not a Priority Development
Project.
7 CONCLUSION
The proposed condition does not increase the peak storm flows top either Los robles Drive or Manzano
Drive. Therefore, no storm water detention is required. The project is a Standard Development Project.
8 ATrACHMENTS
Includes:
Vicinity Map
Existing Drainage Map
Existing Drainage Spreadsheet Analysis
Proposed Drainage Map
Proposed Drainage Spreadsheet Analysis
Table 3-1, Runoff Coefficients forUrban Areas
100 Year 6 Hour Isopluvial
100 Year 24 Hour Isopluvial
Figure 3-1, Intensity-Duration Design Chart
E-34, Storm Water Standards Questionnaire
E-36, Standard Project Requirement Checklist
9 REFERENCES
City of Carlsbad Engineering Design Manual by the City of Carlsbad
San Diego County Drainage Design Manual by the County of San Diego, May 2005.
San Diego County Hydrology Manual by the County of San Diego, June 2003.
Urban Hydrology for Small Watersheds TR-55 by the United States Department of Agriculture,
June 1986.
S. Low Impact Development Handbook by the County of San Diego, December 31, 2007.
Water Quality Control Plan for the San Diego Basin by the California Regional Water Quality
Control Board San Diego Region, April 25, 2007.
Stormwater Best Management Practice Handbook by California Stormwater Quality Association,
September 30, 2004.
q GrocnIE
Terra Mor Point
Cere.zo Bluffs 9
01'olon
sa 11 Diego Pool Hull
,5,511 Los Robles Dr
Sedlak Olfroad School
eo 9.
\? Project Site
ClIm
"11617c,
,/PC/
Go gte
0 00,0 110" /
SHEET llhZE
5511 los Rob/es Drive
Existing Drcincge Condition
62
60
NORTH
1"=40'
DAlE 6-7-20
Pre-Development Hydrology 5511 Los Robles, Carlsbad, Ca, 92008, June 7, 2020, John P. Strohminger Engineering
Manning
Ti
min.
Te
min
cu~;.
IN
t.I!I.]tsIeI.] IeX'II] .X:] 11Th1lL1Thiii-
l.11'Z' —.1Ai
SHEET )71W
212
62
56
5511 Los Rob/es Drive
Proposed Drainage Condition
DA1 6-7-20
60
NORTH
1"=40'
Post-Development Hydrology 5511 Los Robles, Carlsbad, Ca, 92008, June 7, 2020, John P. Strohminger Engineering
Aiea Ti min,
I1IlI[•
Is I I l iii III .1 1111lt.11FTl1*
'4 I fri tiI*] t.II.1 I I li1 I tllileli tsI.l [111 sIs1 . sXI,]
Flow at Node III
San Diego County Hydrology Manual Section: 3
Date: June 2003 Page: 6of26
Table 3-1
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use I Runoff Coefficient "C"
Soil Type
NRCS Elements County Elements % IMPER. A B C D
Undisturbed Natural Terrain (Natural) Permanent Open Space 0.20 0.25 0.30 0.35
Low Density Residential (LDR) Residential, 1.0 DU/A or less 10 0.27 0.32 0.36 0.41
Low Density Residential (LDR) Residential, 2.0 DU/A or less 20 0.34 0.38 0.42 0.46
Low Density Residential (LDR) Residential, 2.9 DU/A or less 25 0.38 0.41 0.45 0.49
Medium Density Residential (MDR) Residential, 4.3 DU/A or less 30 0.41 0.45 0.48 (052)
Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 . 0.51 0.54 0.57
Medium Density Residential (MDR) Residential, 10.9 DU/A or less 45 0.52 0.54 0.57 0.60
Medium Density Residential (MDR) Residential, 14.5 DU/A or less 50 0.55 0.58 0.60 0.63
High Density Residential (HDR) Residential, 24.0 DU/A or less 65 0.66 0.67 0.69 0.71
High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77 0.78 0.79
Commercial/Industrial (N. Corn) Neighborhood Commercial 80 0.76 0.77 0.78 0.79
Commercial/Industrial (G. Corn) General Commercial 85 0.80 0.80 0.81 0.82
Commercial/Industrial (O.P. Com) Office Professional/Commercial 90 0.83 0.84 0.84 0.85
Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84 0.84 0.85
Commercial/Industrial (General I.) General Industrial 95 0.87 0.87 0.87 0.87
*The values associated with 0% impervious may be used for direct calculation of the runoff coefficient as described in Section 3.1.2 (representing the pervious runoff
coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever (e.g., the area
is located in Cleveland National Forest).
DU/A = dwelling units per acre
NRCS National Resources Conservation Service
3-6
County of San Diego
Orange ..
___ _______ _____
Hydrology Manual
County -.
- -----------
-1 ------- 3330 I
Riverside County
N 0
33015-
Rainfall Ivopluvials
- 3315
I 25 100 Year Rainfall Event 6 Hours
OCEANS OE
40
6 isopillvtal (inches)
CARL.;OAO . . - ' - - .,
) . .... .-.
C .. -I
..
--- -
....
0 ENCINITAS
-.
3300 -- - --------- - . .- ..- .-- _5.
0 SOI ANA BEACH - POWv - SI) COhN _,
33 00
DEL MAR
-5. 5_• 5__ . 5555
/ Q
CO
c,
js N 155
PA
25
3245- --- ____ A 30
- - ---• - . -. •. - -. 3245
I GROVE
- ---S - .-- S -.
ORON L'
I - ...' . --5-- -.s-. . .----- --- b--- -
I
l -GIS SaThGIS
-
.5-.--
S5. - . ,,-
I N 15SiM,P!iPROvOWT.nJTW.ncYOc,nKc
IMPERIAL REACH •. .- -- ./ 5.---.-. 5------- .
S
3230' 3230 S
P 3 0 3Miles
P P P
'range 3330
'unty 33'30
County of San Diego
Hydrology Manual
VVVVVVVVV;:V:VVV V•
Riverside County
6
OP
T.
0. -. Rainfall Isopluvials
3315 - 'O 3315
o --V V VV •V V V - 100 Year Rainfall Event 24 Hours
OCEVMS OF •VVV V VVVVV
V V VVVVVVVVVVV
VV VVV V V VVV V -s-• -_________ - -
6 ep 7 IsopIuvial (inches)
CARLSBAD
ENNAS
.V !;_V,VVV SOLANA R EACH
V
— pOAY 5-0
--8-0--- 3300 SO 01N1v
C) DEL 3 3
-
MAR
o
0 85 V V VVVCV V V V•V
- - I SANlF: -
• V V VVVVV V
V
V •VVVVV
-. V •V
V•• V V
VVVVVVV7, -V
VV.VVVIVVVVVVV VVV
VV VV VV• V
tk -F5
-- --
- ------- - -
'••V
V Lc~
V
- •VV VV• VVVVVVVVVV
32'45 . 5D
•• V
C oiv(O'
V - VVVQV ;VV
V• •VVVVVVVV V V V DR ON
V• VV —32'45
V V
'\ -d
VV • V •V (V S
I
-VV
V
V V
-'-GIS áiiGIS H
I
(I'ER AL HEA(VVR —
N ss MK
A C,VVR,
Mex
32 30 S
8 32*30 3 0 3MiIes
Directions for Application:
From precipitation maps determine 6 hr and 24 hr amounts
for the selected frequency. These maps are included in the
County Hydrology Manual (10. 50, and 100 yr maps included
in the Design and Procedure Manual).
Adjust 6 hr precipitation (if necessary) so that it is within
the range of 45% to 65% of the 24 hr precipitation (not
applicaple to Desert).
Plot 6 hr precipitation on the right side of the chart.
Draw a line through the point parallel to the plotted lines.
This line is the intensity-duration curve for the location
being analyzed.
Application Form: ______
Selected frequency 1 100 year
P6 = 2.6 , in.. '24 = 4.6 !. = I I %(2)
P24
6.0 : (C) Adjusted p6(2) = 2.6 in.
5,5 9. (d) it 5 mm. 5.0
4.5 (e) i = 6.85 in./hr.
3.5 . Note: This chart roplacoc the Intensity- Duration-Frequency
3.0 curves used since 1965.
P6
Duration1
1 i
I
1.5272.5l 3"3.st" 4 4.5 5 5.5 ' 6
- I I lT i'ii1 p p
5 2.63 j3.95 5276.5917.9D!9.22 1054 118613.1/ 14.49 1581
7
1O
2.12 It.1R 4.2415,3016.36 17.42 3.3714.2115.05!5.90 1.68'2.53
964 1060 1166 1272
7.58 8.42 6.74 927 1011
15 'i:30:11. 24 519 58.1 6.49 7.13 7.78
20 1.08 •1:62 2.15'2.6913.23 3.771 4 85
25 - 0.93 1.40 1.87' 2.33260 3.27J 373 420 46? 5.13 5.60
30 -- 0.83 i.24 l.66t2.0712.49"2.991 332 373 4.15 4.56 4.98
40 0.69 1.03 1.38 1.72 2.07 2.41 2.76 310 345 379; 4.13
50
Ifl
0.60 ,0.90 1.!9 1.49 1.79 2.09
053 080 1D61a3rI.5918612.I2
2.39 2.69 2.98 328 358
?39265292t318
- 90 0.41 0.61 0.82 1.021.23 1311 63, 184 2.04 225 2.45
120 0.34 0.51 0.68 0.8511.02 1.191 ¶044 0.29 0.590;73 0.88 1.031
1.36 1.53 1.70 187 2,04
' 1.32' 1.18 1.47 1 62 1.76 150
180 026 4039 0.52[o.65.10.78.0.9111o4, 118, I31 144, 157
240 0.22 A3310. -Z 0.54 06 0.76j 0.87 0.98 1.08 1.19 1.30
300 O.190.2810.38 0.47 .0.56'0.66
0.17i0.2510.33 O.4itO.50 0.58t0.67
0.75 085 0.04 P.03 i.13
360 0.75 0.8.i o.921.00
TiTp
• %bi I IluIllIllI IllhIIlII1uIlIIIIlIIIDIIlIIlllllllIUhIuIIuII lIlIllIllIll If 111111
•
-Intensity___ Ii 1li II
1111JIIJI1fl
IlDilil
11111111 • 1I!i!iI !i!!i IIDllIIIII1IIIIIIll
• MMES. -I II!1iIJb!!IIIIIIIIIII
I'UjflhIII1I1I1IlF
-'I"
•
'9 t1rlII 1tI
UIIkl!1Ii!!IIi!llhiI!!WIIfIIIIIIIIIllUHIIIHIDhI1I
• WIN 00202NNON 'I%_Mi~_N11111M H
• !t!III!!MIR
11
• 111.11liilllfli IflIII1 IIDuIllhII!I Ifflllflh! [1111111 I!I
• NUIItIIUflHHhIIIIIh 1lluhIIIIJIIIIillhIllflIHllIllIkIII III1Ubh
•
•
• IIII1IIIIII1IIH1HIIIfflhI nk
• HhIIIIIIIflhIIJJHIIIIIIllh1DIIIllhIOIIIfflhIllll!IIllhIi1I!!IIhiI![IIh
• IIIIIIIIIII
3:300
HOffH
3 10" H 1 3llR1IllhIllhiIllhIIIllhIll1M. MIL'H!llffliM M~~_iiifl
11 H 1
UfflfflIO!!1IIII
HIM 114 Is I
UMU
111 .a......• EUi•ii UIIiiII....tIIz.I1IHjinI-IrnpulII.ui..II. IIUIIIIII•••UINlIIUU1IIIlLIIIIIlfI •••
0131 tJIHglilI
• ..a.••w.Ii
.UWIUri urnI.I,uvwI
IIuWuJlu.u.IuwtuuJLurnrnIIu
mu
...wIuumuhl.ulInh.u..uuIuIuutlmlurnrnIEu......nu..IIhn
IiIP!ff!JIIUI!I
UIUIII
iiDflhluiuiiliuiUifilhllilifllHl i... UNWU1IIIJIU
aim a;mww nwiw:rniinwiirnw ;;:;uiuirniuiliu...u.iuuli iu UIUIUI*Iui11 1IIiIIu•uiuiuiuuiimiiuiiuuuiunuuuiiuuuminuul
tnuiuiiuuluuiiiiuUuiflhJllll ill
irniipiiuni urniimiiwrni II1 I 1 I
KIIHhIfluI 1lUllhIOIHUIfllhIUII]I1Il
iu••iuiu uuim••I
IllhIIIllhIlI
Minute; Hours Duration
Intensity-Duration Design Chart - Template
F I U R E
.3-1
(City of STORM WATER STANDARD S• Development Services
Carlsbad QUESTIONNAIRE Land Development Engineering
1635 Faraday Avenue E-34 (760) 602-2750
www.carlsbadca.gov
To address post-development pollutants that may be generated from development projects, the city requires that new
development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management
Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual,
refer to the Engineering Standards (Volume 5).
This questionnaire must be completed by the applicant in advance of submitting for a development application
(subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of
storm water standards that must be applied to a proposed development or redevelopment project. Depending on the
outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to PRIORITY
DEVELOPMENT PROJECT' (PDP) requirements.
Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City
staff has. responsibility for making the final assessment after submission of the development application.. If staff
determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than
initially assessed by you, this will result in the return of the development application as incomplete. In this case, please
make the changes to the questionnaire and resubmit to the city.
If you are unsure about the meaning of a question or need help in determining, how to respond to one or more of the
questions, please seek assistance from Land Development Engineering staff.
A completed and signed questionnaire must be submitted with each development project application. Only one
completed and signed questionnaire is required when multiple development applications for the same project are
submitted concurrently.
PROJECT NAME: Matthew Residence PROJECT ID:
ADDRESS: 5511 Los Rabies Drive, Carlsbad, CA 92008 APN: 210-115-14-00
The project is (check one): El New Development 0 Redevelopment .
The total proposed disturbed area is: 12850 ft2 (_0.295 ) acres
The total proposed newly created and/or replaced impervious area is: 4999 ft2 (0.1148 ) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the
SWQMP # of the larger development project:
Project ID . SWQMP #:
Then, go to Step I and follow the instructions. When completed, sign the form at the end and submit this with your application to the city.
.
E-34 . Page 1 of 4 REV 02116
* TO POJEqTfr1,
To determine if your project is a "development project", please answer the following question:
YES NO
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building o 9 or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)?
If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my
project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant
information.
Justification/discussion: (e.g. the project includes only interior remodels within an existing building):
If you answered "no" to the above question, the project is a 'development project', go to Step 2.
To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer
the following questions:
Is your project LIMITED to one or more of the following:
YES NO
1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria:
Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-
erodible permeable areas; El N Designed and constructed to be hydraulically disconnected from paved streets or roads;
C) Designed and constructed with permeable pavements or surfaces in accordance with USEPA
Green Streets guidance?
2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in o i accordance with the USEPA Green Streets guidance?
3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? 0 IKI
If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark
the second box stating "my project is EXEMPT from PDP ..." and complete applicant information.
Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with
the USEPA Green Street guidance):
If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3.
E-34 Page 2 of 4 REV 04/17
LEP WJ3
'.0., BE1C0lVlPW1[E_T1ED1FGffA2HLNE _ 0 RT_REDE.V~E.00PME2&g=Ej
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)):
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, 0 EJ and public development projects on public or private land.
Is your project a redevelopment project creating and/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, residential, mixed-use, and public
development projects on public or private land.
Is your project a new or redevelopment project that creates and/or replaces 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 foods and drinks for consumption, including stationary lunch counters and 0 CK
refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial
Classification (SIC) code5812).
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 0 IX
-development project includes development on any natural slope that is twenty-five percent or greater..
Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is
a land area or facility for the temporary parking or storage of motor vehicles used personally for
business or for commerce.
Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious street, road, highway, freeway or driveway surface collectively over the entire project
site? A street, road, highway, freeway or driveway is any paved impervious surface used for the
transportationof automobiles, ,_and other vehicles. _trucks, _motorcycles
Is your project a new or redevelopment project that creates and/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 0 IXI 200 feet or less 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 ESA (i.e. not commingled with flows from adjacent lands).*
Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious surface 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, 5014, 5541, 7532-7534, or 7536-7539.
Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious area 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?
Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
impervious, surface or (2) increases impervious surface on the property by more than 10%? (CMC 0 tI 21 .203.040)
If you answered "yes" to one or more of the above questions, your project is a POP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a POP.
and complete applicant information.
If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the
second box stating "My project is a 'STANDARD PROJECT'..." and complete applicant information.
E-34 Page 3 of 4 REV 04/17
Ly
Tkir
PROJECTS1THATfARE(pRIoRlm' DEVELOPMENTiPROJECTS1(PD)Tp
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)):
YES NO
Does the redevelopment project result in the creation or replacement of impervious surface in an amount
of less than 50% of the surface area of the previously existing development? Complete the percent
impervious calculation below:
Existing impervious area (A) = sq. ft. 0
Total proposed newly created or replaced impervious area (B) = sq. ft.
Percent impervious area created or replaced (B/A)*100 = %
If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious
surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP ..." and complete
applicant information.
If you answered "no," the structural BMP's required for PDP apply to the entire development. Go to step 5, check the
check the first box stating "My project is a PDP and complete applicant information.
i!T MW T'5 IR
TE
El My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must
prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application.
My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT'
stormwater requirements of the BMP Manual.,. As part of these requirements, I will submit a "Standard Project
Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project.
Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations
and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply.
0 My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Applicant Name: John P. Strohminger Applicant Title: Project Civil Engineer
Applicant Signature: ' Date: June 7, 2020
,vn s UV r%ia uuui,iUU UUL di 111)1 uiriiuLu LU an i,ldd vvajer P=ecuon iu.(a) impairea water Doales; areas aesignatea as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
This Box for Citv Usa Onki
City Concurrence:
YES NO.
0 0
By:
Date:
Project ID:
E-34 Page 4 of 4 REV 04/17
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
e applicable and feasible. See
1. Standards) for information to
r 4 and/or Appendix E.1 of the
)iscussion/justification must be
not include the feature that is
)iscussion/justification may be
pplied:. •:••
lYesI 0 N ON/A
DYes I [I No IIJNIA
id 0 Yes 0 No 0 N/A
Revised 09/16
C"'Ii.ty of
STANDARD PROJECT
REQUIREMENT Development Services
Land Development Engineering
•. • SouieCofltrOUReqUirerneiitohtinued), J Applied?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and
Wind Dispersal 0 Yes 0 No Ill N/A
Discussion/justification if SC-4 not implemented:
There are no outdoor work areas proposed with this project.
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal l!l Yes 0 No 0 N/A
Discussion/justification if SC-5 not implemented:
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance).
On-site storm drain inlets 0 Yes 0 No l!I N/A
Interior floor drains and elevator shaft sump pumps Yes 0 No !I N/A
Interior parking garages 0 Yes 0 No Ill N/A
Need for future indoor & structural pest control iii Yes 0 No 1 0 N/A
O Landscape/Outdoor Pesticide Use Ill Yes 0 No 0 N/A
Pools, spas, ponds, decorative fountains, and other water features 0 Yes 0 No ll N/A
Food service 0 Yes 0 No Il N/A
Refuse areas 0 Yes 0 No 1*1 N/A
C] Industrial processes 0 Yes 0 No III N/A
Outdoor storage of equipment or materials 0 Yes 0 No lii N/A
Vehicle and Equipment Cleaning 0 Yes 0 No lI N/A
O Vehicle/Equipment Repair and Maintenance 0 Yes 0 No III N/A
Fuel Dispensing Areas 0 Yes 0 No II N/A
Loading Docks 0 Yes [:]No 9 N/A
Fire Sprinkler Test Water l!1 Yes 0 No 0 N/A
C1 Miscellaneous Drain or Wash Water 0 Yes 0 No ll N/A
Plazas, sidewalks, and parking lots 0 Yes 0 No lii N/A For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No' answers.
Structural lumber to be treated for pests.
Pesticides will be contained onsite.
Fire sprinkler test water to be routed to the sanitary sewer.
E-36 • • Page 2 of 4 Revised 09/16
SiteiDesign BMPs
All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (volume 5 of City Engineering Standards) for information
to implement site design BMPs shown in this checklist.
Answer each category below pursuant to the following.
"Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or. Appendix E.2 thru E.6 of
the Model BMP Design Manual. Discussion /justification is not required.
'No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
"N/A" means the BMPs is not applicable at the project, site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be
provided.
- Sitepesign Requirrnent , pplied?
SD-1 Maintain Natural Drainage Pathways and Hydrologic Features 0 Yes I 0 No I Ill N/A
Discussion/justification if SD-1 not implemented:
The entire site has been previously graded. There are no natural drainage pathways sor hydrologic
features. $
SD-2 Conserve Natural Areas, Soils, and Vegetation $ 0 Yes I 0 No I ll N/A
Discussion/justification if SD-2 not implemented:
There are no natural area, soils, or vegetation on this project site.
SD-3 Minimize Impervious Area I III Yes I 0 No I 0 N/A
Discussion/justification if SD-3 not implemented:
SD-4 Minimize Soil Compaction I III Yes I 0 No I 0 N/A Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion . , I li Yes I 0 No I 0 N/A Discussion/justification if SD-5 not implemented:
E-36 Page 3 of 4 Revised 09/16
. .iSiteiDeSignReguiefl'ent(côntind) . APl lid ?..
SD-6 Runoff Collection II Yes I 0 No 0 N/A
Discussion/justification if SD-6 not implemented: .
SD-7 Landscaping with Native or Drought Tolerant Species I Ill Yes I 0 No I 0 N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvesting and Using Precipitation I lI Yes I 0 No I 0 N/A
Discussion/justification if SD-8 not implemented:
E-36 Page 4 of 4 Revised 09/16