HomeMy WebLinkAboutCD 2017-0003; KAISER CARLSBAD PARKING LOT EXPANSION; CONSISTENCY DETERMINATION PROJECT DESCRIPTION; 2017-02-24PASCO LARET SUITER
111N11.IMINNINMIMPIK &ASSOCIATES
CIVIL ENGINEERING 4-LAND PLANNING +LAND SURVEYING
February 24, 2017
CITY OF CARLSBAD
LAND DEVELOPMENT ENGINEERING
1635 Faraday Avenue
Carlsbad, CA 92008
(760)-602-2781
Re:Kaiser Carlsbad Parking Lot Expansion
Preliminary Storm Water Quality Management Letter
To Whom It May Concern:
Pasco,Laret,Suiter and Associates has prepared the following Preliminary Storm Water Quality
Management Letter as part of the review of the subject project for Consistency Determination for an
expansion ofthe parking lot at the site.
PROJECT DESCRIPTION
The 0.35 acre Kaiser Carlsbad Parking Lot Expansion project site is located within the existing Kaiser
Carlsbad Medical Office Building site located at 6860 Avenida Encinas in the City ofCarlsbad, County
of San Diego, California (APN: 214-450-19).The project site is located at Latitude 33°06'27"N and
Longitude 117°18'52"W and has a total area of 3.16 acres.The surrounding area has been developed
and is comprised of existing commercial uses to the north and south. Interstate 5 is directly east of the
project with Avenida Encinas directly west of the site and existing residential just west of Avenida
Encinas.
The existing site is comprised of two (2) medical office buildings and an elevator/stair building, with
an interior courtyard between the buildings.To the north and south of the existing buildings are patient
and staff parking lots, respectively.The Avenida Encinas frontage of the site is parkway landscaping
with an open landscape area in front ofbuilding 'B.'
For the proposed condition, portions of the existing landscape area will be removed and replaced with
asphalt parking area and a sidewalk connection added for pedestrian access to the Avenida Encinas
right-of-way sidewalk.Storm water from the newly created impervious area will be treated via
biofiltration BMPs along the project street frontage and be connected to the existing site storm drain.
Associated utilities for the site parking area will also be installed,as necessary.
The proposed project is designated as a Priority Development Project (PDP) regarding storm water,as
outlined in the City of Carlsbad BMP Design Manual, dated February 16, 2016.Please see the Form
E-34, "Storm Water Standards Questionnaire," listed as Enclosure (1), for detailed information on the
project's PDP designation.
The project is exempt from hydromodification management requirements per the criteria detailed in
Section 1.6 of the City of Carlsbad BMP Design Manual.Specifically, the drainage from this project
site is conveyed via underground storm drain pipe from the point of discharge until it outlets at
Batiquitos Lagoon, an enclosed embayment, which is included in the Carlsbad Watershed Management
535 N. Highway 101 Ste A Solana Beach, California 92075 1 ph 858.259.82121 fx 858.259.4812
plsaengineering.com
KAISER CARLSBAD PARKING LOT EXPANSION FEBRUARY 2017
PRELIMINARY STORM WATER QUALITY MANAGEMENT AND DRAINAGE PG. 2
Area Water Quality Improvement Plan (WQIP), dated June 2016,as an exempt water body.Within the
Carlsbad WQIP, reference Appendix F entitled,"Hydromodification Exemption Analyses for Select
Carlsbad Watersheds" by Chang Consultants dated September 17, 2015.The HMP Exemption Exhibit
from this report is included as Enclosure (2) for reference, and highlights the project site shown within
the HMP exemption area.
EXISTING DRAINAGE
The existing site drainage conveyance for the project site is urban, with area drains located throughout
the site in landscape planter areas and in strategic parking lot locations to drain hardscape areas.The
northerly parking lot area on the site drains to the NW corner ofthe parking lot and outlets via surface
drainage to the Avenida Encinas right-of-way.
Offsite drainage from the Caltrans right-of-way to the directly east of the site is conveyed through the
project site via an underground 18" RCP storm drain.Just before reaching Avenida Encinas the 18"
RCP confluences at a Type A-4 Cleanout with a 12" PVC storm drain from the southerly parking area
and then continues to the west across Avenida Encinas.
Flow then continues north along Avenida Encinas for a short distance where the storm drain then turns
west into Poinsettia Properties,Planning Area 5 (Ref.C.O.C.DWG 378-9),and then to Poinsettia
Properties,Planning Areas 2,3,&4 (Ref.C.O.C.DWG 396-7),via increasingly larger storm drain
piping until a 60"RCP outlets to an existing 72" RCP storm drain within the San Diego Northern
Railway right-of-way.This large main trunk line storm drain continues southerly in the railroad right-
of-way and then along N. Coast Hwy 101 for a total ofapproximately 1 mile until its ultimate outlet via
an 84" RCP storm drain to a rip-rap energy dissipater at Batiquitos Lagoon. (Ref. C.O.C. DWGs 399-7
and 337-9).(See the above Project Description for discussion on the project's qualification for HMP
exempt status).
PROPOSED DRAINAGE
For the proposed condition, portions of the existing landscape area will be removed and replaced with
asphalt parking area and a sidewalk connection added for pedestrian access to the Avenida Encinas
right-of-way sidewalk.Storm water from the newly created impervious area will be treated via
biofiltration BMPs along the project street frontage and be connected to the existing site storm drain on
site.Runoff from the new impervious area will drain via sheet flow to one of two (2) BMPs located
along the project frontage.The new parking area and sidewalk areas (DMA 1)will drain via overland
flow (gutters,and concrete swale) to the larger BMP.And at the southerly end of the parking lot,
where the new parking area entrance and 2 parking stalls are proposed (DMA 2),a trench drain has
been added to capture flow from these areas and direct it to the smaller BMP at the project frontage.
The outlet of the larger BMP will be an 18" RCP, connecting to a proposed re-built cleanout, while the
smaller BMP will outlet to an 8" PVC pipe and connect to the existing 12" PVC storm drain from the
parking lot.
STORM WATER QUALITY MANAGEMENT SUMMARY
The Storm Water Quality BMP sizing and methodology for the project was developed using the City of
Carlsbad BMP Design Manual, dated February 16,2016.The disturbed area of the site was broken
down into two (2)Drainage Management Areas (DMAs)for storm water quality treatment.
Biofiltration BMPs (BF-1)were chosen for storm water quality treatment due to the poor infiltration
condition from Hydrologic Soil Group `D'soils at the site and,therefore,the need to provide an
impermeable liner for the BMP basins.As described above, the site is exempt from hydromodification
requirements and Hydromodification Management Plan (HMP) BMP sizing was not implemented.
535 N Highway 101 Ste A Solana Beach, California 92075 I ph 858.259.8212 I fx 858.259.4812
plsaengineering.com
KAISER CARLSBAD PARKING LOT EXPANSION FEBRUARY 201 7
PRELIMINARY STORM WATER QUALITY MANAGEMENT AND DRAINAGE PG.3
Below is a summary of the storm water quality calculations for the site.
TABLE 1.0 STORM WATER QUALITY DMA SUMMARY
BASIN IMPERVIOUS PERVIOUS TOTAL AREA
AREA (ACRES)_AREA (ACRES)(ACRES)
1 0.24 0.07 0.31
2 0.03 0.01 0.04
*Reference Enclosure (3) Post-Development DMA Exhibit
TABLE 2.0 STORM WATER QUALITY BMP SUMMARY
*DCV BMP AREA BMP AREA
BASIN REQUIRED**PROVIDED**(CU. FT.)(SF)(SF)
462 296 310
2 58 36 45
*DCV per Worksheet B.2-1 [See Enclosure (4)]
**Biofiltration BMP Sizing per Worksheet B.5-1 [See Enclosure (5)&(6)]
CONCLUSION
The proposed project provides the required storm water quality BMPs per the City of Carlsbad BMP
Design Manual and project storm water runoff will be treated through new, above-ground biofiltration
BMPs along the right-of-way frontage of the site.Additionally,as the project is exempt from
Hydromodification Management Plan requirements as described above,HMP sizing has not been
addressed in this summary.The project, therefore, meets the storm water management requirements of
the City of Carlsbad.
Ifyou have any questions or comments, please feel free to contact me at (858) 259-8212.
Sincerely,
PASCO LARET SUITER & ASSOCIATES, INC.//4'(W.
Se/17_
•I T
-1 I
LY ,No.RCE 6E5()f
Gregory W. Lang, P.E.lir XP.06-3021.1'5 ,(P11
Principal Y Civil
Enclosures:
(1)Storm Water Standards Questionnaire (C.O.C. Form E-34)
(2)HMP Exemption Exhibit
(3)Post-Development DMA Exhibit
(4)DMA DCV Summary
(5)Worksheet B.5-1 (DMA 1)
(6)Worksheet B.5-1 (DMA 2)
(7)NRCS Web Soil Survey for 6860 Avenida Encinas
535 N Highway 101 Ste A Solana Beach, California 92075
1
ph 858.259.82121 fx 858.259.4812
plsaengineering.com
STORM WATER STANDARDS Development ServicesCity of QUESTIONNAIRE Land Development Engineering
Carlsbad E-34 1635 Faraday Avenue
(760) 602-2750
www.ca rl sbadca.gov
INSTRUCTIONS:
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 INFORMATION
PROJECT NAME: Kaiser Carlsbad Parking Lot Expansion PROJECT ID:
ADDRESS: 6860 Avenida Encinas APN:214-450-19
The project is (check one): Ell New Development 1j Redevelopment
The total proposed disturbed area is:15,825 ft2 (0.36 )acres
The total proposed newly created and/or replaced impervious area is:11,600 ft2 (0.27 )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 N/ASWQMP #:N/A
Then,go to Step 1 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 02/16
Enclosure (1)
STEP I
TO BE COMPLETED FOR ALL PROJECTS
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
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.
STEP 2*BE COMPLETED FOR'ALL DEVELOPMENT PROJECTS
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:
a)Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-
erodible permeable areas;
134b)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 Liaccordance 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?
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 02/16
Enclosure (1)
8_
'
>
•
SEtOCOMPLittlia FoilALI:MEW OR REDEVELOPMENT`oitimater*.--.r
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)):
YES NO
1.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,El
and public development projects on public or private land.
2.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
1=1more of impervious surface?This includes commercial,industrial,residential,mixed-use,and public
development projects on public or private land.
3.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 El
refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial
Classification (SIC) code 5812).
4.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 111 11
development project includes development on any natural slope that is twenty-five percent or greater.
5.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 Dalandareaorfacilityfor the temporary parking or storage of motor vehicles used personally for
business or for commerce.
6.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 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.
7.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
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).*
8.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 El 0shop 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.
9.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 0RGO'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.
10.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?I:0
11.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
21.203.040)
If you answered "yes" to one or more of the above questions, your project is a PDP.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 PDP ..."
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 02/16
STEP 4
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP)ONLY
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 amountoflessthan50%of the surface area of the previously existing development?Complete the percentimpervious calculation below:
Existing impervious area (A) =91,187 sq. ft.
Total proposed newly created or replaced impervious area (B)=11,600sq.ft.
Percent impervious area created or replaced (B/A)*100 =12.7
If you answered "yes",the structural BMPs required for PDP apply only to the creation or replacement of impervioussurface and not the entire development.Go to step 5, check the first box stating "My project is a PDP ..." and completeapplicant 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.
STEP 5
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
12:1 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.
0 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:Gregory W. Lang Applicant Title:P.E., Principal
Applicant
Signature:XI/if/7 (Ai
Date:02/20 7
•Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies;areas designated 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 bodiesdesignatedwiththeRAREbeneficialusebytheStateWaterResourcesControlBoard(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; HabitatManagement Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
This Box for City Use Only
YES NO
City Concurrence:
El
By:-AV (2.\
Date:3 _LT.(7
Project ID:(„D 2617 ce.63
E-34 Page 4 of 4 REV 02/16
Enclosure (1)
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MO-FILTRATION EOM WITH IMPERMEABLE LINER DETAILNOTTOSCALE
--
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PASCO LARET SUITER Project: Kaiser Carlsbad
Job No.: PE 2512-01
& ASSOCIATES Calc. By: RT Date: February 2017
CIVIL ENGINEERING +LAND PLANNING +LAND SURVEYING Checked: RT Date:February 2017
Sheet:1 of 1
DMA DCV Summary
Kaiser Carlsbad Parking Lot Expansion
February 2017
Where:
C =Runoff factor (unitless)
d =85th percentile, 24-hr storm event rainfall depth (inches), refer to section B.1.3.
A =Tributary area draining to the BMP
DCV Area Sizing
BASIN AREAS (SF)AREAS (acre)d C Design Capture
(DCV)Volume (DM*
Impervious Pervious D.G.Total Impervious Pervious D.G.Total (In)(no unit)(c0
10,611
1,143
3,072 0 13,683
1,695
0.24 0.07 0.00 0.31 0.57 0.72
0.70
462
552 0 0.03 0.01 0.00 0.04 0.57 58
*DCV =3630 x Cmcv)x d (inches) x A (acres)
DCV Surface Runoff Factors*Proposed Biofiltration BMP Section
Impervious Area 0.9 Section Thickness (in)Porosity Volume/sf
Pervious Area/Landscape 0.10 Ponding 10 1.0 0.83
Decomposed Granite 0.30 Engineered Soil 18 0.1 0.15
*See Table B.1-1 Gravel 12 0.4 0.40—
Total Volume/SF 1.38
Enclosure (4)
Kaiser Carlsbad Parking Lot Expansion
PE 2512-01
2/17/2017 DMA 2
Worksheet B.5-1:Simple Sizing Method for Biofiltration BMPs
1 'Remaining DCV After implementing retention BMPs 58.0 cu-ft
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr
3 Allowable drawdown time for aggregate storage below the underdrain 36 hours
4 Depth of runoff that can be infiltrated [Line 2 x Line 3]0.00 inches
5 Aggregate pore space 0.40 in/in
6 Required depth of gravel below the underdrain [Line 4 /Line 5]0.00 inches
7 Assumed surface area of the biofiltration BMP 45.0 sq-ft
8 Media retained pore storage 0.1 in/in
9 Volume retained pore storage 6.75 cu-ft
10 DCV that requires biofiltration [Line 1 -Line 9]51.3 cu-ft
BMP Parameters
11 Surface Poding [6 inch minimum,12 inch maximum]10 inches
12 Media Thickness [18 in Min], also add mulch layer thicknes to this line 18 inches
Aggregate Storage above underdrain inver (12 inches typical)-Use 0 inches for
13 12 inchessizingif the aggregate is not over the entire bottom surface area
14 Freely drained pore storage 0.4 in/in
Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the
15 filtration rate is controlled by the outlet,use the outlet controlled rate which will 5 in/hr
be less than 5 in/hr.)
Baseline Calculations
16 Allowable Routing Time for sizing 6 hours
17 Depth filtered during storm [Line 15 x Line 16]30 inches
Depth of Detention Storage
18 [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]
22.00 inches
19 Total Depth Treated [Line 17 +Line 18]52.00 inches
Option t -eloffiter L5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]77 cu-ft
21 Required Footprint [Line 20 /Line 19]x 12 17.7 sq-ft
OptiOn 2 -Stom 0.75 of remaining_DCV In pores and potting
22 Required Storage (surface +pores) Volume [0.75 x Line 10]38 cu-ft
23 Required Footprint [Line 22 /Line 18]x 12 21 sq-ft
Footprint of the OMP
24 Area draining to the BMP 1695.0 sq-ft
Adjusted Runoff Factor for drainage area (Refer 0.70
25 to Appendix B.1 and B.2)
BMP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint26 0.03sizing factor from Worksheet B.5-2, Line 11)
27 Minimum BMP Footprint [Line 24 x Line 25 x Line 26]36 sq-ft
28 Footprint of the BMP =Maximum (Minimum(Line 21, Line 23), Line 27)sq-ft
Check for Volume ReductiOn (Not applicable for No Infiltration Condition!
24 Calculate the fraction of DCV retained in the BMP [Line 9 /Line 1]04-1-6 offitless
9.3-75 unities&Mifgffief14--reetuir-ed-ffaet-ien-ef-DC-V-Fetaified-fef-par-tia44FvfikFateFi-eeRelit-ieff&
46-the-Retaiffeel-Dwer -is-11434ReFease4he-feetpfifit-sizing N1A $444
feetef-in-Line46-unti1414e-answer-is-yes-for-this-er-itefieR.
J:\Active Jobs\2512 KAISER CARLSBAD\CIVIL\REPORTS\SWQMP\Preliminary SWQMP Letter\CALCS\2512_Worksheet B.5-
1_Biofiltration BMP Sizing
Enclosure (6)
Kaiser Carlsbad Parking Lot Expansion
PE 2512-01
2/17/2017 DMA 1
Worksheet B.5-1:Simple Sizing Method for Biofiltration BMPs
1 'Remaining DCV After implementing retention BMPs I 462.0 cu-ft
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr
3 Allowable drawdown time for aggregate storage below the underdrain 36 hours
4 Depth of runoff that can be infiltrated [Line 2 x Line 3]0.00 inches
5 Aggregate pore space 0.40 in/in
6 Required depth of gravel below the underdrain [Line 4 /Line 5]0.00 inches
7 Assumed surface area of the biofiltration BMP 310.0 sq-ft
8 Media retained pore storage 0.1 in/in
9 Volume retained pore storage 46.50 cu-ft
10 DCV that requires biofiltration [Line 1 -Line 9]415.5 cu-ft
BMP Parameters
11 Surface Poding [6 inch minimum,12 inch maximum]10 inches
12 Media Thickness [18 in Min], also add mulch layer thicknes to this line 18 inches
Aggregate Storage above underdrain inver (12 inches typical)-Use 0 inches for
13 12 inchessizingif the aggregate is not over the entire bottom surface area
14 Freely drained pore storage 0.4 in/in
Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the
15 filtration rate is controlled by the outlet,use the outlet controlled rate which will 5 in/hr
be less than 5 in/hr.)
Baseline Calculations:.
16 Allowable Routing Time for sizing 6 hours
17 Depth filtered during storm [Line 15 x Line 16]30 inches
Depth of Detention Storage
18 [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]
22.00 inches
19 Total Depth Treated [Line 17 + Line 18]52.00 inches
Option I -Mother 1$ thies the DCV
20 Required biofiltered volume [1.5 x Line 10]623 cu-ft
21 Required Footprint [Line 20 /Line 19]x 12 143.8 sq-ft
Option 2 -Store 0.75 of remaining DCV in pares and paling
22 Required Storage (surface +pores) Volume [0.75 x Line 10]312 cu-ft
23 Required Footprint [Line 22 /Line 18]x 12 170 sq-ft
Footprhit of the BMP
24 Area draining to the BMP 13683.0 sq-ft
Adjusted Runoff Factor for drainage area (Refer
25 to Appendix B.1 and B.2)0.72
BMP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint26 0.03sizing factor from Worksheet B.5-2, Line 11)
27 Minimum BMP Footprint [Line 24 x Line 25 x Line 26]296 sq-ft
28 Footprint of the BMP =Maximum (Minimum(Line 21, Line 23), Line 27)sq-ft
Check far Volume RethiCtion Not applicable for No Infiltration Conditionyt*.4‘x„.
Calculatc thc fraction of DCV retained in the BMP [Line 9 /Linc 1]04G-1 wit-less
oeitiess
-34)Mi441414:112A-Fewifed4Faetien-ef-DC-V-Feteifteel-fer-peFtial-iofittfatieR-ceaditiens
is-the-Retaieed-DC-0.34-5?-14-the-answer—is-fte-ineFease-the-feetpfiet-csietng-f4/A N/A34factor in Line 26 until the answer is yes for this criterion.
J:\Active Jobs\2512 KAISER CARLSBAD\CIVIL\REPORTS\SWQMP\Preliminary SWQMP Letter\CALCS\2512_Worksheet B.5-
1_Biofiltration BMP Sizing
Enclosure (5)
USDA United States A product of the National Custom Soil ResourceDepartment of Cooperative Soil Survey,
Agriculture a joint effort of the United Report for
N RCS
States Department of
Agriculture and other San Diego CountyFederal agencies, State
Natural agencies including the
Resources Agricultural Experiment Area,California
Conservation Stations, and local
Service participants 6860 Avenida Encinas, Carlsbad,
CA
.•
..•
ET-77
February 14, 2017
Enclosure (7)
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
Enclosure (7)
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Enclosure (7)
Contents
Preface 2
How Soil Surveys Are Made 5
Soil Map 8
Soil Map 9
Legend 10
Map Unit Legend 11
Map Unit Descriptions 11
San Diego County Area, California 13
CfB—Chesterton fine sandy loam, 2 to 5 percent slopes 13
MIC—Marina loamy coarse sand,2 to 9 percent slopes 14
References 16
4
Enclosure (7)
How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons,in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change.To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
Enclosure (7)
Custom Soil Resource Report
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
6
Enclosure (7)
Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
7
Enclosure (7)
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
8
Enclosure (7)
Custom Soil Resource Report
•A Soil Map W
2g',
470.990 470610 470630 470650 470670 470690 470710 470730 470750
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Meters
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Map projection: Web Mercator Comer2°° Cornercoordinates: WGS84 Edge tics: UTM Zone 11N WGS84A300
9
Enclosure (7)
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Custom Soil Resource Report
Map Unit Legend
San Diego County Area, California (CA638)
Map Unit Symbol Map Unit Name Acres In A01 Percent of A01
CfB Chesterton fine sandy loam, 2 0.0 0.5%
to 5 percent slopes
MIC Marina loamy coarse sand, 2 to 3.2 99.5%
9 percent slopes
Totals for Area of interest 3.2 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
Iandform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
11
Enclosure (7)
Custom Soil Resource Report
development of resource plans. If intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex,0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area,it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association,0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils,0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
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Enclosure (7)
Custom Soil Resource Report
San Diego County Area, California
CfB—Chesterton fine sandy loam,2 to 5 percent slopes
Map Unit Setting
National map unit symbol:hb9h
Elevation:50 to 600 feet
Mean annual precipitation:10 to 14 inches
Mean annual air temperature:61 to 63 degrees F
Frost-free period:330 to 350 days
Farmland classification:Farmland of statewide importance
Map Unit Composition
Chesterton and similar soils:85 percent
Minor components:15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Chesterton
Setting
Landform:Hillslopes
Landform position (two-dimensional):Backslope
Landform position (three-dimensional):Side slope
Down-slope shape:Convex
Across-slope shape:Convex
Parent material:Ferruginous sandstone
Typical profile
H1 -0 to 19 inches:fine sandy loam
H2 -19 to 34 inches:sandy clay
H3 -34 to 60 inches:indurated
Properties and qualities
Slope:2 to 5 percent
Depth to restrictive feature:About 19 inches to abrupt textural change; 20 to 40
inches to duripan
Natural drainage class:Moderately well drained
Runoff class:Very high
Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately
low (0.00 to 0.06 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Available water storage in profile:Very low (about 2.6 inches)
Interpretive groups
Land capability classification (irrigated):3e
Land capability classification (nonirrigated):3e
Hydrologic Soil Group:D IEcological site:ACID CLAYPAN (Claypan Mesas -1975) (R019XDO62CA)
Hydric soil rating:No
Minor Components
Carlsbad
Percent of map unit:5 percent
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Custom Soil Resource Report
Hydric soil rating:No
Huerhuero
Percent of map unit:5 percent
Hydric soil rating:No
Marina
Percent of map unit:4 percent
Hydric soil rating:No
Unnamed, ponded
Percent of map unit:1 percent
Landform:Depressions
Hydric soil rating:Yes
MIC-Marina loamy coarse sand,2 to 9 percent slopes
Map Unit Setting
National map unit symbol:hbdz
Mean annual air temperature:57 to 61 degrees F
Frost-free period:330 to 350 days
Farmland classification:Prime farmland if irrigated
Map Unit Composition
Marina and similar soils:85 percent
Minor components:15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Marina
Setting
Landform:Ridges
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Eolian sands derived from mixed sources
Typical profile
H1 -0 to 10 inches:loamy coarse sand
H2 -10 to 57 inches:loamy sand, loamy coarse sand
H2 -10 to 57 inches:sand, coarse sand
H3 -57 to 60 inches:
H3 -57 to 60 inches:
Properties and qualities
Slope:2 to 9 percent
Depth to restrictive feature:More than 80 inches
Natural drainage class:Somewhat excessively drained
Runoff class:Medium
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
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Custom Soil Resource Report
Frequency of ponding:None
Salinity, maximum in profile:Nonsaline to very slightly saline (0.0 to 2.0
mmhos/cm)
Available water storage in profile:Moderate (about 8.7 inches)
Interpretive groups
Land capability classification (irrigated):3s
Land capability classification (nonirrigated):4e
Hydrologic Soil Group:B
Hydric soil rating:No
Minor Components
Carlsbad
Percent of map unit:5 percent
Hydric soil rating:No
Chesterton
Percent of map unit:5 percent
Hydric soil rating:No
Corralitos
Percent of map unit:5 percent
Hydric soil rating:No
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Enclosure (7)
References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M.,V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18.http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/national/soils/?cid=nrcs142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580
Tiner, R.W.,Jr.1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
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United States Department of Agriculture, Natural Resources Conservation Service.
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home/?cid=nrcs142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
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A
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/soils/scientists/?cid=nrcs142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?
cid=nrcs142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
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