HomeMy WebLinkAboutPIP 06-06; CARLSBAD RACEWAY LOTS 1-4; STORMWATER MANAGEMENT PLAN; 2006-02-10,,
STORM WATER MANAGEMENT PLAN
FOR
LOTS 1-4 CARLSBAD RACEWAY
February 1 O, 2006
· Prepared for:
H.G. Fenton Comp~ny
7577 Mission Valley Road, Suite 200
San Diego, CA 92108
Wayne W. Chang, MS, PE
Civil Engineering O Hydrology O Hydraulics O Sedimentation
P .0. Box 9496
Rancho Santa Fe, CA 92067
(858) 692-0760
-TABLE OF CONTENTS -
1.0 Introduction ....................................................................................................................... l
1.1 Project Description ............................................................................................................ !
1.2 Topography and Land Use ................................................................................................ 2
1.3 Hydrologic Unit Contribution ........................................................................................... 2
2.0 Water Quality Environment .............................................................................................. 2
2.1 Beneficial Uses ................................................................................................................. 2
2.1.1 Inland Surface Waters ....................................................................................................... 3
2.1.2 Groundwater ..................................................................................................................... 3
3.0 Pollutants and Conditions of Concern ............................ : ................................................. 3
3.1 Pollutants from Proposed Site .......................................................................................... .3
3 .2 Pollutants of Concern in Receiving Waters ..................................................................... .4
3.3 Conditions ofConcern ...................................................................................................... 4
4.0 Mitigation Measures to Protect Water Quality ................................................................ .4
4.1 Construction BMPs .......................................................................................................... 4
4.2 Post-Construction BMPs .......................................................................................... : ........ 5
4.2.1 Site Design BMPs ................................................................... : ......................................... 5
4.2.2 Source Control BMPs ....................................................................................................... 5
4.2.3 Treatment Control BMPs .................................................................................................. 6
5.0 Operation and Maintenance Program ........................................................... .' ................... 6
6.0 Summary/Conclusions ....................................................................................................... 6
Site Maps
APPENDIX A
SUSMP Drainage Report for Lots 1-4 Carlsbad Raceway
1.0 INTRODUCTION
This Storm Water Management Plan (SWMP) addresses water quality requirements
associated with the H.G. Fenton Company's Lots 1-4 Carlsbad Raceway project (see the Site
Maps following the report text). A SWMP is required under the City of Carlsbad's April
2003, Standard Urban Storm Water Mitigation Plan (SUSMP) since the development will be
a priority project ("Commercial Development over 100,000 square feet" and "Parking Lot"
categories). Appendix D of the SUSMP outlines the SWMP (aka, Water Quality Technical
Report) objectives, which are to identify pollutants and conditions of concern, to describe
best management practices (BMP), and to identify maintenance requirements. BMPs will be
utilized to the maximum extent practicable to provide a long-term solution for addressing
runoff water quality. This SWMP also intends to ensure BMP effectiveness through proper
maintenance based on long-term fiscal planning.
1.1 Project Description
The Lots 1-4 Carlsbad Raceway site covers approximately 19.35 acres and is located on the
south side of Lionshead Avenue (westerly extension of Poinsettia Avenue) immediately east
of Melrose Drive in the city of Carlsbad (see Vicinity Map). The site has been mass graded
and is within Lots 1 through 4 of the Carlsbad Raceway Industrial Park. The site will be
developed with seven industrial condominium buildings, associated parking, and
landscaping. The total building area will be approximately 194,100 square feet.
PACIFIC
OCEAN
BUSINESS PARK DR.
~~~~SITE
CITY OF ENCINITAS
Vicinity Map
1
l
1.2 Topography and Land Use
The site has been recently graded into a relatively level pad as part of the Carlsbad Raceway
Industrial Park. Consequently, there are no existing uses on the site.
1.3 Hydrologic Unit Contribution
The project is located within the Los Monos Hydrologic Subarea (904.31) of the Agua
Hedionda Hydrologic Area (904.30), which is within the Carlsbad Hydrologic Unit (904.00).
The total drainage area of the hydrologic unit is approximately 210 square miles. Runoff
from the hydrologic area ultimately drains to Agua Hedionda Creek, west of the site. The
project site represents much less than one percent of the Agua Hedionda Creek watershed.
2.0 WATER QUALITY ENVIRONMENT
2.1 Beneficial Uses
The beneficial uses for the hydrologic unit are included in Tables 1 and 2. These tables were
obtained from the Water Quality Control Plan for the San Diego Basin (9). The following
contains definitions of the beneficial uses in the tables:
MUN -Municipal and Domestic Supply: Includes uses of water for community,
military, or individual water supply systems including, but not limited to, drinking
water supply.
AGR -Agricultural Supply (AGR): Includes uses of water for farming,
horticulture, or ranching including, but not limited to, irrigation, stock watering, or
support of vegetation for range grazing.
IND -Industrial Services 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.
RECl -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 limited to, swimming, wading, water-skiing, skin and
SCUBA diving, surfing, white water activities, fishing, or use of natural hot springs.
REC2 -Non-Contact Recreation: Includes the uses of water for recreational
involving proximity to water, but not normally involving body contact with water,
where ingestion of water is reasonably possible. These uses include, but are not
limited to, picnicking, sunbathing, hiking, camping, boating, tide pool and marine life
study, hunting, sightseeing, or aesthetic enjoyment in conjunction with the above
activities.
2
WARM -Warm Freshwater Habitat: Includes uses of water that support warm
water ecosystems including, but not limited to, preservation or enhancement of
aquatic habitats, vegetation, fish or wildlife, including invertebrates.
WILD -Wildlife Habitat: Includes uses of water that support terrestrial ecosystems
including, but not limited to, preservation and enhancement of terrestrial habitats,
vegetation, wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), or
wildlife water and food sources.
2.1.1 Inland Surface Waters
Inland surface waters for the Agua Hedionda Hydrologic Area have the beneficial uses
shown in Table 1:
Table 1. Beneficial Uses for Inland Surface Waters
Hydro logic
Area § .-< C'l ~ "O
Number 6h "O u u ~ Q) ~ ::E < ,El ~ fs:
904.62 • • • • • • •
• Existing Beneficial Use
2.1.2 Groundwater
Groundwater beneficial uses for the Los Monos Hydrologic Subarea are shown in Table 2:
Table 2. Beneficial Uses for Groundwater
Hydro logic ca ]
~ ca Area .9' 'Ei u Number .§ u "' -~ ] ::E <
904.62 • • •
• Existing Beneficial Use
3.0 POLLUTANTS AND CONDITIONS OF CONCERN
3.1 Pollutants from Proposed Site
The following table lists pollutants of concern that can potentially exist at the proposed site.
The pollutants are from the City of Carlsbad's SUSMP. The project pollutants are all
secondary, not primary, pollutants because the downstream receiving water bodies are not
303(d) impaired for any of these pollutants (see Section 3.2).
3
(.
Priority
Project Sediments
Cate~ories
Commercial
Development
> 100,000 sf
Parking Lots
.. X = Ant1c1pated
P = Potential
p(I)
pOl
Heavy Organic
Nutrients Metals Compounds
p(I) p(2)
pO) X
(1) A potential pollutant iflandscaping exists on-site
Trash
&
Debris
X
X
(2) A potential pollutant if the project includes uncovered parking areas
(3) A potential pollutant ifland use involves food or animal waste products
(4) n/a
(5) Including solvents
3.2 Pollutants of Concern in Receiving Waters
Oxygen Oil Bacteria
Demanding & & Pesticides
Substances Grease Viruses
p(5) X p(3) p(S)
p(l) X p(I)
According to the 2002 303(d) list approved by the San Diego Regional Water Quality
Control Board, the receiving water body, Agua Hedionda Creek, closest to the project
vicinity is not 303(d) listed. Further downstream of the site, Agua Hedionda Creek (the lower
7 miles) is impaired with total dissolved solids and Agua Hedionda Lagoon is impaired with
bacterial indicators and sedimentation/siltation.
3.3 Conditions of Concern
A condition of concern exists if the project alters the hydrologic regime such that the
downstream channels and habitat integrity are impacted. The City of Carlsbad's SUSMP
requires that a drainage report be prepared that discusses the conditions of concern. The
drainage report is contained in Appendix A.
4.0 MITIGATION MEASURES TO PROTECT WATER QUALITY
To address water quality for the project, best management practices (BMPs) will be
implemented both during and post-construction.
4.1 Construction BMPs
A Construction Storm Water Pollution Prevention Plan (SWPPP) was prepared by O'Day
Consultants in June 2002 for the mass grading. In addition, a Construction SWPPP will be
prepared for the Lots 1-4 grading. A detailed description of the construction BMPs will be
presented within the Lots 1-4 SWPPP. Potential construction BMPs to be included in the
SWPPP are:
• Gravel Bags, Silt Fences, Fiber Rolls
• · Pavement Sweeping
• Storm Drain Inlet Protection
• Stockpile Management
• Water Conservation Practices
• Material Delivery, Storage, and Use
• Hydroseed, soil binders, or straw mulch
• Spill Prevention and Control
4
• Solid Waste Management • Waste Management
• Stabilized Construction Entrance/Exit • Water Conservation Practices
• Vehicle and Equipment Cleaning, Fueling, and Maintenance
• Education
Construction BMPs for this project will be installed and maintained to comply with all
applicable ordinances and guidance 'documents.
4.2 Post-Construction BMPs
Pollutants of concern as noted in Section 3.1 will be addressed through three types of BMPs:
Site design, source control and treatment control as discussed below. The BMP locations are
shown on the Site Map following this report text, as appropriate.
4.2·.1 Site Design BMPs
In order to improve surface runoff quality, the following site design BMPs will be
incorporated into the proj~ct:
• Minimize use of impervious areas. Paving and other impervious surfaces will only be
constructed where necessary. In these areas, the paving will provide water quality
benefits by preventing ground infiltration of pollutants.
• Construct trash enclosures. Trash enclosures will be constructed at several locations
throughout the site. The trash receptacles will have covers to prevent rain infiltration.
• Prevent diversion of surface runoff. The drainage patterns intended by the Carlsbad
Raceway Industrial Park will be essentially maintained by the proposed project.
• Include bio-filtration to treat storm water runoff. Landscape areas will be
incorporated around the site and building perimeters to the maximum extent
praticable.
• Maintain runoff into existing water quality basin: O'Day Consultant's August 2003,
Storm Water Management Plan for Carlsbad Raceway C.T. 98-10, includes a
permanent "pollution basin" (Pond 1) northeast of the Lionshead Avenue and
Melrose Drive intersection. This basin was provided to treat runoff from Lots 1-4.
The proposed development will maintain storm runoff into this basin.
4.2.2 Source Control BMPs
Source control BMPs will consist of measures to prevent polluted runoff. The following lists
the source control BMPs:
• Covered receptacles will be used to reduce trash and debds in storm runoff,
• Pavement sweeping will be performed routinely to reduce the introduction of trash,
debris, and sediment into the drainage systems.
• Employee training
5
• Irrigation systems will be designed to each landscaped areas water requirements.
Irrigation systems will be turned off when not necessary due to precipitation.
• All storm water conveyance inlets and catch basins will have stenciling and/or
signage in accordance with the City of Carlsbad's criteria.
4.2.3 Treatment Control BMPs
The following treatment control BMPs will be implemented to address water quality:
• Perimeter landscaping will be installed around the entire site and individual buildings
to provide bio-filtration of runoff. Roof drains will not be directly connected to the
storm drain system, but will direct _runoff over landscape areas first. Alternatively,
roof drain filters can be incorporated.
• Existing BMPs: O'Day Consultant's August 2003, Storm Water Management Plan
for Carlsbad Raceway C.T. 98-10, includes a permanent "pollution basin" (Pond 1)
northeast of the Lionshead A venue and Melrose Drive intersection. This basin is
specifically intended to treat storm runoff from Lots 1-4.
5.0 OPERATION AND MAINTENANCE PROGRAM
The H.G. Fenton Company will be responsible for on-site pavement sweeping, recycling,
trash pickup, and landscape maintenance. The pavement sweeping will occur as necessary to
prevent pollutants from being tracked from the site. Recycling will occur every two weeks
and trash pickup will occur weekly. Landscape maintenance will be required for the proposed
landscape areas. The vegetation will be maintained and inspected on a weekly. basis by
landscape maintenance staff and will be replaced or replanted as necessary. The vegetation
will also be inspected prior to storm events, and any trash and debris will be promptly
removed.
Hazardous Wastes
Suspected hazardous wastes will be analyzed to determine disposal options. Hazardous
materials are not expected to be generated on site; however, if discovered, hazardous
materials will be handled and disposed of according to local, state, and federal regulations. A
solid or liquid waste is considered a hazardous waste if it exceeds the criteria listed in the
California Code of Federal Regulations, Title 22, Article 11 (State of California, 1985).
6.0 SUMMARY/CONCLUSIONS
This SWMP has been prepared in accordance with the City of Carlsbad's April 2003,
Standard Urban Storm Water Mitigation Plan, and has evaluated and addressed potential
. pollutants associated with the project and their effects on water quality. This SWMP has. been
based on the most up-to-date plans available at the time of preparation. A summary of the
facts and findings associated with the project and the measures addressed by this SWMP are
as follows:
6
• The beneficial uses for the rece1vmg waters have been identified. None of these
beneficial uses will be impaired or diminished due to the construction and operation of
the site.
• The project will not significantly alter drainage patterns from the site. The site is part of
the recently approved Carlsbad Raceway Industrial Park. The drainage patterns
anticipated by the park are being maintained. ·
• A Storm Water Pollution Prevention Plan for construction activities will be prepared to
address construction-related water quality objectives.
• Permanent BMPs will be incorporated into the project in the form of site design, source
control, and treatment control.
• The proposed BMPs address mitigation measures to protect water quality and beneficial
uses to the maximum extent practicable.
• The H.G. Fenton Company will be responsible for BMP maintenance and operations.
7
APPENDIX A
DRAINAGE REPORT
SUSMP DRAINAGE REPORT
FOR
LOTS 1-4 CARLSBAD RACEWAY
February 1 O, 2006
Prepared for:
H.G. Fenton Company
7577 Mission Valley Road, Suite 200
San Diego, CA 92108
Wayne W. Chang, MS, PE
Civil Engineering O Hydrology O Hydraulics O Sedimentation
P .0. Box 9496
Rancho Santa Fe, CA 92067
(858) 692-0760
-TABLE OF CONTENTS -
Introduction ................................................................................................................................... 1
Hydrology ..................................................................................................................................... 1
Conclusion .................................................................................................................................... 2
Hydrology Backup Data
Grading Plan
INTRODUCTION
The Lots 1-4 Carlsbad Raceway site covers approximately 19.35 acres and is located on the
south side of Lionshead Avenue (westerly extension of Poinsettia Avenue) immediately east
of Melrose Drive in the city of Carlsbad (see Vicinity Map). The site has bee:p. mass graded
and is within Lots 1 through 4 of the Carlsbad Raceway Industrial Park. The site will be
developed with seven industrial condominium buildings, associated parking, and
landscaping. The total building area will be approximately 194,100 square feet.
CITY OF" ENCINITAS
Vicinity Map
This drainage report has been prepared to address the Conditions of Concern associated with
the project, as required by the City of Carlsbad's April 2003, Standard Urban Storm Water
Mitigation Plan (SUSMP).
HYDROLOGY
O'Day Consultants (O'Day) prepared a June 20, 2003 Hydrology and Hydraulic Study for
Carlsbad Raceway, C. T 98-10. This report was for the Carlsbad Raceway Industrial Park
project and has been approved by the City of Carlsbad. Since Lots 1-4 are within the
Carlsbad Raceway Industrial Park, the O'Day analysis encompassed the project site.
Drainage Basin 5 from the O'Day report covers Lots 1-4 as well as the adjacent streets.
There are essentially no off-site areas that contribute runoff to the site. Surface runoff from
1
Drainage Basin 5 is collected by a backbone storm drain system in Lionshead Avenue and
conveyed westerly to a permanent pollution prevention basin (Pond 1 ), immediately
northeast of Lionshead A venue and Melrose Drive, for water quality treatment. Runoff from
Pond 1 will ultimately be conveyed to Agua Hedionda Creek. Pond 1 and the receiving storm
drain system in Lionshead A venue have been designed assuming industrial development
within Lots 1-4. The O 'Day study assumed the following hydrologic parameters for the Lots
1-4 site:
100-year, 6-hour precipitation= 3.0 inches
100-year, 24-hour precipitation= 5.2 inches
Hydrologic Soil Group = "D"
Land Use= "Industrial"
O'Day determined a 100-year flow rate from Drainage Basin 5 to be approximately 148 cfs.
In accordance with the SUS MP requirements, this report provides analyses for the 2-and 10-
year storm events. Table 1 contains the analyses (the backup data is included following the
report text):
Storm Runoff Time of Intensity, Area, Flow Rate,
Event Coefficient, C Concentration, min.1 I (in/hr) A(Ac) Q=CxJxA (cfs)
2-Year 0.87 . 5 3.8 22.77 75
10-Year 0.87 5 5.2 22.77 103
I .. Mmimum Tc per the County of San Diego Hydrology Manual is 5 mm. This was used due to short travel time
across site.
Table 1. Summary of Flows
CONCLUSION
Final design of the Lots 1-4 site will include private on-site drainage facilities that convey the
site runoff to the existing backbone storm drain in Lionshead A venue that will be constructed
with the overall Carlsbad Raceway Industrial Park. This is consistent with the original
Industrial Park design. Furthermore, the Lots 1-4 land use is consistent with the drainage
analyses prepared for the Industrial Park. Consequently, the receiving drainage facilities and
water bodies have been designed to handle and convey the Lots 1-4 runoff. A site
investigation revealed no downstream concerns related to erosion, slope stability, or
vegetative stress. For all of the above reasons, no conditions of concern are identified for the
Lots 1-4 Carlsbad Raceway project.
2
.
· 1~111+1f'W,==,,JW-.,_E.._QU.,_fti..,_,:TI'""'O-'-N......._......,.: ..... ! w,;, 1"'"'· -!++!ill-
', ,: ·:, . l = 7_44Pao·0;645 '
-:I = Intensity {infhr)
:I i :' '· r:,6 = 6~Hour Precipllatfon {In) : m:::,:~.l.:J·· .... ·,,.'.:,ti-=H+:)H;+~,H: +!+!{,-·~ -= Duration (min)
i::. ' ,: .111,;1' ~ ', 11;1
I
I
lntenalty..Ouratlon Des1gn Chart~ Template
Di.-.ctlons for Application:
{1) From preoli:;itaflon maps, mitem1ine 6 hr and 24 hr amounts
for the selected frequency. These maps are includei'l in the
Gounty 1-fydrology Manual (10, 50, and 100 yr maps inclllded
in 1h~ Design and Procedure Manual}.
(2) Adjust 6·hr precJpltatlon (if necessary) so that It is within
the range of 45% to 65% ,of·lhe 24 hr precipitation (not
appllcap!e to Desert).
(3) Plot 6 hr predprtalion on the right side of the chart.
(4) Draw a line through the point parallel to the plotted lines.
(5} This line is the intensily-duration curve for the location
being analyzed.
Application Form:
(a) Selected frequency _L year
(b) P5 = il_ in., P24 = M_ .;s = ..if_ %f2)
{c) Adjusted P6(2l = [1_ in. 24
(d) fx = £ min.
{e) I= M in.lhr.
Note; This chart replaces the Jntenslty-Duratlon.Frequancy
curves used since 1965.
I.GURR
i 3-1
0.6
•0..5
EQUAT:ION
I = 7.44Rs.o~Oe645'
N.;;±-ft"<f-i4~rt;.f~~r,fflmmttMtttlttlttf'tttt1tlt1I j e Intensity: (irilhr)
P5 = 6-Ho1.1r Pl"3cipilation (In)
~w,ioolct+li+i+;!ffi!Ht o = Duration (min)
1
I
o . ..f.
-o.3
3 4 5 6
Duration Hours
Diractlons forApplJcatlon:
{1} From preclpitalion.ml;IJ)s.Qeterrrnne 6 hr and 24 nr amounts
for !heselectec:l>frequency. These maps:are included in the
Coumy Hyr;lrology,Manua1:{10,.50;.:a11d 100 .yr maps Included
in the Design. and Procedure Manual).
(2) Adjust 6 hr precipitation (If necessary) so that .it is wltllin
the range of 45% to 65% of {he 24 hr precipitation (not
applicaple to Desert}.
{3) Plot 6 hr prooipitalion on the right side of tho chart.
(4) Draw a tine through the point parallal'to the plotted lines.
(5) This line is the intensity-duration curve for lhe location
belng analyzed.
Appllcation Form:
{a) Selected frequency -1fJ__ year
(b} P5 .. ..1J}_ in., P24 .. -1J..f ,;s == J.l %<2i
(J 24 {c} Adjusted P6(2> = -1JL in. ,.
{d) 1x :;; __j_ min.
{e) I .. .$± 1n.lhr.
Note: This chart.replaces the Intensity-Duration-Frequency
·curves used·since 1965.
F GU RE
fntenstty-Dundlon Design Chart • Temprate 3-1
~~
~
~· .. ~·
" I ; .,
' ',
I ' J·
!$ 6 1 8 9 10 15
01.1rallon
'
2
Directions for Appllcatlon:
(1) from precipitation maps dotermToa 6 hr and 24 hr amounts
for the selected "frequency. These maps are included In the
County Hydrology Manual (10, 50, an() 100yrm&l)S included
in 1he Design and Procedure Manual).
(2) Adjust 6 h-r. precipitation (if necessary} so 1hat ll is within
the range of 45% to 65% of the 24 hr p!'Bcipi!atfon (not :appncapf,e-to Desert).
(3) Plot 6 hr precipitation on the right side of the chart
(4) Draw a line through the point parallel to the plolted !in~.
(5) This line is lhe intensity-duration curve ror the 1ocalion
be-Ing analyzed.
Appllcation Form:
(a) Selected frequency Jf!.!_ ye.ar
(b) :P6 = 3:..D_ in .• p24 = 21_, :e =-...f.f__ %r2i
'1 /1 24 (c) Mjusted p6<21.,, ..,z.N._ ln.
(d) ix "' _5__ min.
(e) l = 'l 1 ln.lhr.
Note: This chart rep!ace-s th-a lntensity-Duratlon•Fre,guency
curves used since 1965.
FI RE .,
lntenslty..Ouratton Design Chart .. Template 3 1 -
Sm1 Diego County Hydrology tvlanual
Date: June 2003
Section:
Pa.ie:
3
12 of26
Note that the Initial Time of Concentration should be reflective of the general land-use at the
upstream end of a drainage basin. A single lot with an area of t\vo or less acres does not have
a significant eftect where the drainage basin area is 20 to 600 acres.
Table 3-2 provides limits of the length (Maximum Length (LM)) of slteet flq,v to be used in
hydrology studies. Initial Ti values based on average C values for the Land Use ElenJent are
also included. These values can be used in planning and design applications as described
below. Exceptions may be approved by the "Regulating Agency" when submitted with a
detailed study.
1\1AXll\1Ul\l OVERLAND FLO'°'' LENGTH (LM)
& INITIAL TI.lVIE OF CONCENTRATION (T1)
Element* DU/ .5% 1% 2% 3% 5~{1 10%
Acre LM Ti LM Ti LM Tt LM T ..I LM Ti LM T-- l . .. -. --<---
Natural 50 13.2 70 12.5 85 1.9:~ -100 10.3 100 8.7 100 6.9 --
LOR l 50 12.2 70 11.5 85 10.0 100 9.5 100 8.0 100 6.4
LDR 2 50 11.3 70 10.5 85 9.2 100 8.8 100 7.4 IOQ 5.8
LDR 2.9 50 10.7 70 10.0 85 8.8 95 8.1 100 7.0 IQO 5.6
MDR 4.3 50 10.2 70 9.6 80 8.1 95 7.8 100 6.7 100 5.3
:MDR 7.3 50 9.2 65 8.4 80 7.4 95 7.0 lQO (:i.0 100 4.8
lvIDR 10.9 50 8.7 65 7.9 80 6.9 90 6.4 100 I s.1 100 4.5
MDR 14.5 50 8.2 65 7.4 80 65 90 6_.0 100 .S.4-100 __ 4_.3
HDR 24 50 6.7 65 6.1 75 5.1 90 4.9 95 4-.J 100 3.5
HOR 43 50 5.3 65 4.7 75 4.0 85 3.8 9~ 3.4 10P. _2.7
l -·-· - -..
N.Com 50 5.3 60 4.5 75 4.0 85 3.8 95 3.4 1.00 2.7
G.Com l 50 4.7 60 4.1 75 3.6 85 3.4 9Q 2 . .9 1-00 2.4
O.P./Com 50 4.2 60 3.7 70 3.1 80 2.9 90 2,,_6 100 2.2 -.
Limiteiil. 50 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2
l'F1 '" General l. 50 3.7 60 3.2 70 2.7 80 2.6 90 2.3 100 J.9. ...... C°" l able 3-1 f~ more detnil.ed description
3-12
San Diego Counly Hydrology Manual
Dale: June 2003
Table3-1
Section:
Page:
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use Runoff Coefficient ·•c"
Soil Type
NRCS Element<: Coun Elements %IMPER. A B
Undisturbed Natuml Tcrn1in (Natuml) Pennanent Open Space o• 0.20 0.25
Low Density Residential (LOR) Residential. 1.0 DU/A or kss LO 0.27 0.32
tow Density Residential (LOR) Residential, 2.0 DU/A or less 20 0.34 0.38
Low Density Residential (LOR) Residential, 2.9 DU/A or less 25 0.38 0.41
Medium Density Residential (MDR) Residential, 4.3 DU/A or less 30 0.41 0.45
Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 0.51
Medium Density Residential (?vfDR) Residential, 10.9 DU/A or Ie.o;;s 45 0.:52 0.54
Medium Density Residential (MDR) Residential. 14.5 DUJA or le.~ 50 0.55 0.58
High Density Residential (HDR) Residential, 24.0 DU.IA or less 65 0.66 0.67
High Density Residential (HOR) Residential, 43.0 DUI A or le.,;.c, 80 0.76 0.77
Commercial/lndustrial (N. Com) Neighborhood Commercial 80 0.76 0.77
Commercialllndustrfal (G. Com) General Commercial 85 0.80 0.80
Commercialflndustrial (0.P. C(lm) Office ProfessionaVCommercial 90 0.83 0.84
Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84
Commcrrcial/lnduslrial (G<.,-neral 1.· General .Industrial 95 0.8,7 0.87
C
0.30
0.36
0.42
0.45
0.48
0.54
0.57
0.(){)
0.69
0.78
0.7S
0.81
0.84
-0.M
0.:87
3
6of26
D
035
0.41
0.46
0.49
0.52
0.:57
0.60
0.63
0:71
0.79
0.79
0.82
0.85
*The values associated· with Cl1"/o impervious may be wed for direct calculation of the runoff coefficient as described in Section '3.J .2 (representing the pervious runoff
coefficient, Cp, 'for the soil type), or for areas that will remain undisturbed ln perpetuity. Justification must be given that the area will remain natul'.al forever ( e.g .• the area
is: located in Cleveland Nationai Fomst).
DU/A ;a dwelling units per acre
NRCS -=-National Resources Conservation Service
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County of San Diego
Hydrology Manual
Rainfall lsopluvial.s
2 Year ~nfil_li Event. t'i ]fours
l ········ loopluvial [m:,!in,;J
___ ___J
c in ., ~-I:> ~ County of San Diego [ ·l: ·f :: £ . -~--
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County of San Diego
Hydrology Manual
Rninfall lr,opluvials
10 Year .Rai_l!.~~ E,•ent -6 Hours
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County of San Diego
Hydrology Manual
Rainfall lsopiuvials
IO_Ye!!t: Rainfall E.nmt ".14 Bours:
loopluV1el (lnc~e!l)
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County of San Diego
Hydrology Manual
Raitfall lsopluvials
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County of San Diego
Hydrology Manual
Rainfall Isopluvials
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-----
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KEYNOTES:
SITE PLAN LEGEND:
A
C
a
c,,:J
F.H.
Standard
Compact
: Accessible
Fire Department Access Road Min. 24' Wide
Accessible Parking Space
Compact Parking Space
Indicates Accessible Path of Travel
Min.4'Wide
Trash enclosure 6' high painted.
Light Standard (30'-0' high)
Light Bollard
Fire Hydrant
le ,a·-o· tf 2·-0· OYerhong
{ 111
15'-0" ,· , .. ·-!t------i1 No Overhang _ ___J Pennilled
Planned Industrial Permit
Lot Line Adjustment
Lot Consolidation
LOTS 1-4
Carlsbad Raceway
Lionshead Ave.
Developer:
Architect:
Sheet Title:
Sheet
Date:
of
Carlsbad California
Revisions:
HG Fenton Company
Sillman Wright Architects
SIUMn
WRIC1tlT
ARCMITLCTS
7515 METROPOLITAN DR., SUIT
SAN DIEGO, CA 92·
ill 619.294.7515 FAX 619.294.759:
Drown By: Checked By:
No. Dote
Issue Description
Project No.:
Sheet Titles:
Sheet No.:
05015
Partial
Site Plan
3
--! -..:::;:=---------
Ii w w w sl~ :c 0 ~I~ ::; z f'= z 0 I ~ u.
I ------t-----
I
PARTIAL
@
SITE
0 40' 80'
---
PLAN
120'
KEYNOTES:
Min. 24' Wide . Road ~ Fire Department Access
A
C
a
C<I
F.H.
Standard
Compact
Accessible
Accessible Parking Space
Compact Parking Space
Indicates Accessi Min. 4' Wide ble Path ofTravel
Trash enclosure 6' h" h 19 painted.
Light Standard (30'..0" high)
Ught Bollard
Fire Hydrant
1.: 1s·-o· !r~. ,•, No Overhang ___J Pennilted
Planned Ind . Lot Li A . ustnal Pennit ne dJustm Lot Consolidatio;nt
LOTS 1-4
Carlsbad
Lionshead Ave.
Developer:
Architect:
SheetTitle:
Racewa
Carlsbad C . Y alifomia
• HG Fenton Company
SIiiman Wright Architects
Sheet~_of
Date: Revisions:
Slllf\An
WR I GMT
ARCM rrras
7515 METROPOLITAN DR., SUIT
SAN DIEGO, CA 92·
1EL 619.294.7515 FAX 619.294.759:
Drown By: Checked By:
No. Dote
Issue Description
Project No.:
She;;;efT:tTi;;:tle:::s-.· ---u05015
Sheet No.:
Partial
Site Plan
4
I
I
\
I
----...
LEGEND
DESCRIPTION
6" CONCRETE CIJR8
6" TYPE 'G' CI/IIB ANO GUTTER
CONCRETE GIITTER
A9'11Al.T PA ID/ENT
CfJ'ICRElE PA '4JEJ/T
PRECAST CONQIE7E CATCH BASIN
PRTYA TE: S'TRUCTIJRAL TREATIIENT BMP
PR/VA TE: TYPE A aEANOIJT
l/ASONRY RETAIN/NC WAl1 'j
aJT/Flll. St.OPE
£ARllfWQRK OUAN1111ES
CUT: 35.000 CY
Fil: 35.000 CY
GENERAL NOTES.
SYMBOL
(j) RETAINING IIMLL N.aiG SOUTHD11.Y PN/KliC A/EA AMJ A POR1KN CF /fES1IRLY PNll/lNQ A1i!,4.
EXIS77NG CQNDITTONS
1/E PROPOSED QWJIN(J FDR CNII.SBAD RACElll4Y CT !JIJ-10 IS PRESENTED AS EX/STING 11POCRN'HY
FDll 1HIS PRO.ECT. Sll1ROIHJINC 1DPOCRAPHIC INFOIIMA-IS MSO 1HAT /JSED BY 1/E RAa.lY
PRO.ECT. LK7iSIEN/ A 'EH/E.HIJ 11/0SE UTIIJ1ES Plla'OSE1J AS PART CF 1IE RAtn14Y FWaEr:T ARC
loOCA 1ED AS 0/SIWG.
ASSESSOR'S PARCEL NUMBER
221--880-0/, ~ 1U 1H
LOT UNE CONSQUDA 110N
A LOT UN£ COIISllll4 '/ION (p-XX) IS BEJNI) PROCESSED CONCtll1({£]{1LY.
Planned Industrial Permit
Lot Consolidation
··Lots 1-4
PIP 06-
ADJ 06-
. Carlsbad Raceway
Lio.nshead Ave. Carlsbad California
Slut\An
WRICJtlT
ARCMITLCTS
7515 MElR(P(UTAN DR., fil 400
SAN DIEGO, CA 92108
ID. 619.294.7515 FAX 619.294.7592
PIP 06-xx
ADJ 06-xx
Drawn By: Checked By:
No. Date Issue Description
Developer: Date: HG Fenton Company 02/13/06
SCALE: t• = 40' - ----0 60 120 o CHERRY ENGINEERING"
1
12721 Poway Road, Poway, CA. 92064
Ph (858} 679-34iO. Fax (858) 679-3416
Architect
Sheet Tille:
· Sheet
Date:
of
Revisions:
Siilman WJight Architects Project No.:
Sheet Titles:
GRADING PLAN 1
Sheet No.:
C-1
\
\
t
I
J1
t
LE GENO
DESCRIPTION
6• CONCRETE CIJRB
6• TYPE 'G' CrJRB AND GIIT7ER
CDNCR£7E GUTTER
ASPHALT PA 1£1/ENT
Cf!NCRE7E: PA',£1/ENT
PR£CAST CONCl1F:TE CATr:lf BASIN
PRIVATE STRUCTURAL TRE:ATIIENT BMP
PR/VA TE rtP£ A Cl.EANOUT
/IASONIIY RETAINING WAil.
CUT/Fill. Sl.0F£
EARTHWORK QUANllllfS
CUT: 35,000 <:f
FIil: .J5;000 <:f
GENERAL NOTES
EXISTING CQNOlllONS
SYMBOL
CIJT~FU
1HE PflU'OSED GRAD/NI: RJR c.w.s8AO RAa»HY <:T 118-10 IS~ AS Dm1NC 1rJPOGRAFHY RJR 7H1S PRO.ECT. SIIIJ10IHltNr1 TrPr1GRAPHC JNFa/llA11(1/ IS Al.SO IHAT IJSE1) BY TIE RACEJ'AY fflO.ECl t.niSHENJ AIEM'E AM) 11/0SC UlllJTlES FRa'OSED AS PA/IT OF TIE RAaJllY l'RO,ET NIE INDtCATED AS £IOSIING.
ASSESSQR's PARCEL NUMBER
221--880-01, 0-Z lli fH
LOT UN£ CONSOL/DA 110N
A llJT /IC Cl71Sa1MT/al (/C5-¥X) IS IIE1MJ PROCESSED t:aiQI/REN11.Y.
Planned Industrial Pennit PIP OS.
Lot Consolidation ADJ 06-
Lots 1-4
Carlsbad Raceway
Lionshead Ave.
Developer:
Architect
Sheet Title:
Sheet of
Carlsbad California
HG Fenton Company
Sillman Wright Architects
SCALE: t·-= 40• Date: Revisions:
0 40 80 120
0 CHERRY ENGINEERING
12721 Poway Road, Poway, CA 92064
Ph (858) 679-3410 Fax (858) 679-3416
SILLMn
WRldMT
ARCMflCCTS
· 7515 MElR!P(lJTAN DR., Slfil 400
SAN DIEGO, CA 92108
1Il. 619.294.7515 FAX 619.290592
PIP 06-xx
ADJ OS.xx
Drown By: Checked By:
No. Date Issue Description
Project No.:
Sheet litles:
GRADING PLAN 2
Sheet No.:
C-2