HomeMy WebLinkAboutCT 06-24; LNR Bressi Commercial; Storm Water Management; 2010-03-31BRESSI RANCH COMMERCIAL
MAJOR BUILDING 'B'
ADDENDUM TO STORM WATER MANAGEMENT
PLAN FOR BRESSI RANCH PLANNING AREA 15
CT 06-24
CITY OF CARLSBAD, CA
RECORD COPY
PROJECT DESIGN CONSULTANTS
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BRESSI RANCH COMMERCIAL
MAJOR BUILDING 'B'
ADDENDUM TO STORM WATER MANAGEMENT
PLAN FOR BRESSI RANCH PLANNING AREA 15
CT 06-24
CITY OF CARLSBAD, CA
MARCH 2010
Prepared For:
LNR PROPERTY CORPORATION
4350 VON KARMAN AVE, SUITE 200
NEWPORT BEACH, CA 92660
Prepared By:
PROJECT DESIGN CONSULTANTS
Planning I Landscape Architecture I Environmental I Engineering I Survey
701 B Street. Suite 800
San Diego, CA92101
619.235.6471 Tel
619.234 0349 Fax
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Job No. 3219.20
Prepared by: C. Pack, P.E.
Under the supervision of
Def>by Reece, ]*£ RCE 56148
Registration Expires 12/31/10
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TABLE OF CONTENTS
1. INTRODUCTION 1
2. PROJECT DESCRIPTION 2
3. POLLUTANTS AND CONDITIONS OF CONCERN 3
Anticipated and Potential Pollutants from the Project Area 3
Conditions of Concern 3
4. STORM WATER BEST MANAGEMENT PRACTICES 4
LID Site Design BMPs 4
Source Control BMPs 5
BMPs Applicable to Individual Priority Development Project Categories 6
Structural Treatment BMPs 7
Selected Treatment BMP(s) 9
BMP Plan Assumptions 9
5. PROJECT BMP PLAN IMPLEMENTATION 11
Construction BMPs 11
Recommended Post-Construction BMP Plan 11
Operation and Maintenance Plans 12
6. PROJECT BMP COSTS AND FUNDING SOURCES 13
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TABLES
Table 1. Anticipated and Potential Pollutants Generated by Land Use Type 3
Table 2. Priority Development Project BMPs 6
Table 3. Structural Treatment Control BMP Selection Matrix 8
Table 4. Characterization of Pollutant Removal 8
Table 5. BMP Design Criteria 10
Table 6. BMP Costs 13
APPENDICES
1. Storm Water Standards Questionnaire
2. Project Maps
3. Supplemental BMP Information
4. Operation and Maintenance Plan
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1. INTRODUCTION
I As part of the grading and building permit package, this Storm Water Management Plan
(SWMP) was prepared to define recommended project Best Management Practice (BMP)
• options that satisfy the requirements identified in the following documents:
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• City of Carlsbad Standard Urban Storm Water Mitigation Plan, 2010 Storm Water
Standards,
• California Regional Water Quality Control Board, San Diego Region, Order No. R9-
2007-0001, NPDES No. CASO108758, Waste Discharge Requirements for Discharges of
Urban Runoff from the Municipal Separate Storm Sewer Systems (MS4s) Draining the
Watersheds of the County of San Diego, the Incorporated Cities of San Diego County,
the San Diego Unified Port District, and the San Diego County Regional Airport
Authority.
Specifically, this report includes the following:
• BMP design criteria and water quality treatment calculations;
• Selected BMP options for the project;
• BMP device information for the selected BMP options; and
• Operation, maintenance, and funding for the selected BMPs.
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2. PROJECT DESCRIPTION
This SWMP addendum has been prepared in support of a final engineering grading and building
permit submittal for the Major Building 'B' in Bressi Ranch Commercial Planning Area 15. The
rest of Bressi Ranch Commercial was previously constructed per Drawing 452-9A. The design
for the Bressi Ranch Commercial project anticipated the future construction of Major Building
'B,' and the area for the future building was graded as a flat pad per that project. PDC prepared
the SWMP for the entire site and the BMP sizing calculations assumed future development of
Major Building 'B'. Refer to the Storm Water Management Plan: Bressi Ranch Planning Area
15, dated November 2007, submitted concurrently with this SWMP addendum for reference.
Since this addendum supplements the November 2007 report, this addendum focuses only on the
design of Major Building 'B.' For information regarding the previous project (and information
that would be duplicated if included herein), refer to the approved November 2007 report. For
example, refer to the 2007 report for downstream receiving waters and beneficial uses, since they
are the same for this project as the previous project. The downstream BMP (Jensen Precast
Interceptor) is currently treating (and will continue to treat) runoff from the Major Building 'B'
site. The BMPs discussed in this addendum are only specific to the Major Building 'B' site,
since the original SWMP documents the other site design, source control, and treatment control
BMPs used elsewhere throughout Bressi Commercial Planning Area 15.
The proposed site consists of a very small portion of the overall Planning Area 15 of Bressi
Ranch. The proposed improvements are less than one acre and tie into the existing
improvements that surround the site (per Sheet 7 of Drawing 452-9A).
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3.POLLUTANTS AND CONDITIONS OF CONCERN
Anticipated and Potential Pollutants from the Project Area
Anticipated pollutants from the site under proposed conditions include sediment, nutrients, trash
and debris, organic compounds, oil and grease, pesticides, oxygen demanding substances, and
heavy metals.
TABLE 1. ANTICIPATED AND POTENTIAL POLLUTANTS GENERATED BY LAND USE TYPE
Project
Categories
Commercial
Development
Parking Lots
Roadways
General Pollutant Categories
Sediment
P(l)
P(l)
X
Nutrients
P(l)
P(l)
P(l)
Heavy
Metals
X
X
Organic
Compounds
P(2)
X(4)
Trash
&
Debris
X
X
X
Oxygen
Demanding
Substances
P(5)
P(l)
P(5)
Oil&
Grease
X
X
X
Bacteria
&
Viruses
P(3)
Pesticides
P(5)
P(l)
Notes for Table 1: (1) A potential pollutant if landscaping exists onsite.
X = Anticipated Pollutant (2) A potential pollutant if the project includes uncovered parking areas.
P = Potential Pollutant 0) A potential pollutant if land use involves food or animal waste products.
(4) Including petroleum hydrocarbons
(5) Including solvents
Source: "Table 2. Anticipated and Potential Pollutants Generated by Land Use Type," City of Carlsbad, Public Works Department,
Standard Urban Storm Water Mitigation Plan, Storm Water Standards, A Manual for Construction & Permanent Storm Water Best
Management Practices Requirements, April 2003, pg. 1 2
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Conditions of Concern
A drainage study was conducted by a California Registered Civil Engineer (RCE) to identify the
conditions of concern for this project. The drainage calculations are available in a separate
drainage report addendum. Following is the summary of findings from the study:
• Drainage Patterns: Existing condition runoff patterns are the same and are roughly
equivalent to the patterns analyzed in the approved 2007 backbone drainage report.
There is no expected adverse impact on downstream conditions.
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4. STORM WATER BEST MANAGEMENT PRACTICES
Im The City Storm Water Standards Manual requires the implementation of applicable site design,
§source control, priority project requirements, and treatment control BMPs.
LID Site Design BMPs
The project addresses the site design BMPs required by the City Storm Water Standards as
• follows:
• Maintain Pre-Development Rainfall Runoff Characteristics (BMP-1)
o Minimize impervious footprint
1• - Streets, sidewalks, and parking lot aisles will be constructed to the minimum
1 widths necessary, without compromising public safety.
- The proposed development includes landscaping areas where feasible to
I reduce project imperviousness. The proposed building footprint is much
smaller than what was previously anticipated per the master Bressi
W Commercial project.
m o Conserve natural areas (BMP-2)
- No natural areas to preserve.
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o Minimize directly connected impervious areas (BMP-3)
- To the maximum extent practicable, drainage from rooftops will be discharge
_ into landscaping prior to reaching the storm drain system. (See treatment BMP
II section).
• o Maximize canopy interception and water conservation consistent with the
Carlsbad Landscape Manual (BMP-4)
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- To the maximum extent practicable, native and drought-tolerant trees and
B large shrubs shall be planted instead of non-drought tolerant exotics.
m • Protect Slopes and Channels (BMP-5)
•— There are no significant existing slopes onsite.
1• • Minimize Disturbances to Natural Drainages (BMP-9)
• - There are no natural drainages onsite.
B Source Control BMPs
The project addresses the source control BMPs required by the City Storm Water Standards as
II follows:
9 • Design Outdoor Materials Storage Areas to Reduce Pollution Introduction (BMP-10)
p, o There are no proposed outdoor materials storage areas.
• Design Trash Storage Areas to Reduce Pollution Introduction (BMP-11)
o Project does not propose any new trash storage areas.
|y • Employ Integrated Pest Management Principles (BMP-12 and -13)
^ o The need for pesticide use shall be reduced to the maximum extent practicable byy
including pest-resistant or well-adapted native plant varieties and by distributing
"5 Integrated Pest Management (IPM) education materials to future site tenants.m
o Groundskeepers will be educated on pest management principles.|
• Use Efficient Irrigation Systems and Landscape Design
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o Rain shutoff devices shall be employed to prevent irrigation during precipitation,
consistent with the Carlsbad Landscape Manual. (BMP-14)
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o Irrigation systems shall be designed to each landscape area's specific water
requirements, consistent with the Carlsbad Landscape Manual. (BMP-15)
o Flow reducers and shutoff valves triggered by pressure drop will be used to
control water loss from broken sprinkler heads or lines. (BMP-16)
• Provide Storm Water Conveyance System Stenciling and Signage (BMP-17)
o All storm water conveyance system inlets and catch basins within the project area
shall be labeled, stamped, or stenciled with prohibitive language (such as: "NO
DUMPING - I LIVE DOWNSTREAM") and graphical icons to discourage
illegal dumping, as approved by the City of Carlsbad and to the satisfaction of the
City Engineer.
BMPs Applicable to Individual Priority Development Project Categories
The City Storm Water Standards Manual requires specific BMPs if the project includes private
roads, residential driveways and guest parking, dock areas, maintenance bays, vehicle and
equipment wash areas, outdoor processing areas, surface parking areas, non-retail fueling areas,
or steep hillside landscaping. The Major Building 'B' Project does include components that
require project-specific BMPs. These components include dock areas, private roads, and surface
parking areas. Table 2 addresses the individual priority project category BMPs required by City
according to the Storm Water Standards. The applicability of each BMP for the Major Building
'B' Project is noted in the table and is discussed in narrative form in the last column.
TABLE 2. PRIORITY DEVELOPMENT PROJECT BMPs
Specific BMP
Included
yes no Explanation of how BMP was
included or why it was not included
^BMP-1? Private Roads
The design of private roadway drainage
shall use at least one of the following: (1)
rural swale system - street flows to
vegetated swale or gravel shoulder, curbs
at street corners, culverts under driveways
and street crossings; (2) urban curb/swale
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Roadside swales are inappropriate for
this project due to the commercial nature
of the site. The precise grading of the
site is extremely limited since it is a
small site and it must tie into the existing
grades built per the previous project.
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system - street slopes to curb, periodic
swale inlets drain to vegetated
swale/biofilter, or (3) dual drainage system
- first flush captured in street catch basins
and discharged to adjacent vegetated swale
or gravel shoulder.
BMP-22 Dock Areas
Loading/unloading dock areas shall
include the following: (1) cover loading
dock areas, or design drainage to preclude
urban run-on and runoff; and (2) An
acceptable method of containment and
pollutant removal, such as a shut-off valve
and containment area. Direct connections
to storm drains from depressed loading
docks (truck wells) are prohibited.
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The precise grading of the site is
extremely limited since it is a small site
and it must tie into the existing grades
built per the previous project. However,
all runoff is treated in existing
downstream Jensen Stormwater
Interceptor.
BMP-29, 30 Surface Parking Areas
Where landscaping is proposed in surface
parking areas (both covered and
uncovered), incorporate landscape areas
into the drainage design. Overflow
parking (parking in excess of the project's
minimum parking requirements) should be
constructed with permeable paving.
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Permeable paving is not recommended.
The precise grading of the site is
extremely limited since it is a small site
and it must tie into the existing grades
built per the previous project.
Structural Treatment BMPs
The selection of structural treatment BMP options is determined by the target pollutants, removal
efficiencies, expected flows, and space availability. Table 3 is a selection matrix for structural
treatment BMPs based on target pollutants and removal efficiencies.
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TABLE 3. STRUCTURAL TREATMENT CONTROL BMP SELECTION MATRIX
Pollutants of
Concern
Coarse
Sediment
and Trash
Pollutants that
tend to
associate
with fine
particles
during
treatment
Pollutants that
tend to be
dissolved
following
treatment
Bioretention
Facilities
(LID)
High
High
Medium
Settling
Basins
(Water
Quality
Basins)
High
High
Low
Wet
Ponds
and
Wetlands
High
High
Medium
Infiltration
Facilities
or
Practices
(LID)
High
High
High
Media
Filters
High
High
Low
High-
rate
biofilters
High
Medium
Low
High-
rate
media
filters
High
Medium
Low
Trash
Racks &
Hydro
-dynamic
Devices
High
Low
Low
Source: "Table 4. Structural Treatment Control BMP Selection Matrix," City of Carlsbad, Public Works Department,
Standard Urban Storm Water Mitigation Plan, Storm Water Standards, A Manual for Construction & Permanent Storm
Water Best Management Practices Requirements, January 2010, pg. 16
Based on the target pollutants and typical removal efficiencies, the treatment BMP options to
consider include all of the options in Table 3. Table 4 summarizes the pollutant removal
mechanisms for the various pollutants.
TABLE 4. CHARACTERIZATION OF POLLUTANT REMOVAL
Pollutant
Sediment
Nutrients
Heavy Metals
Organic Compounds
Trash & Debris
Oxygen Demanding
Bacteria
Oil & Grease
Pesticides
Coarse
Sediment
and Trash
X
X
Pollutants that tend
to associate with
fine particles
during
treatment
X
X
X
X
X
X
X
X
Pollutants that
tend
to be dissolved
following
treatment
X
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Not all of these BMPs in Table 3 are feasible for this project. Taking into account the Watershed
pollutants of concern, the proximity of the impaired water bodies, and the potential pollutants
from the proposed development, the target pollutants for this project in order of general priority
are sediment and attached pollutants and pesticides. Since no treatment control BMPs provides
adequate removal efficiency for pesticides, the treatment BMP selection will be based on the
remaining target pollutants. Source control BMPs will provide additional pollutant removal for
the bacteria and pesticides in conjunction with the treatment control BMPs selected.
Selected Treatment BMP(s)
The Owner, Developer, and Project Team have selected to use Filterra roof drain biofiltration
units to treat runoff from the rooftop. Note that a non-standard pre-cast unit will be used in order
to fit a unit within the space constraints south of the proposed building. The runoff from the
entire site will be treated downstream with the existing Jensen Precast Stormwater Interceptor.
See Appendix 3 for additional treatment BMP information.
BMP Plan Assumptions
The following assumptions were made in calculating the required BMP sizes:
• A runoff coefficient, 'C' value, of 1.0 was used in the runoff calculations for the project
area per the manufacturer's specifications. (Note that drainage calculations assumed
C=0.87 for entire site).
• BMP Design Constraints
• Locate outside public right-of-way
• Facilitate access for maintenance
• Avoid utility conflicts
Table 5 summarizes the criteria that were implemented in the design of the recommended project
BMPs.
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TABLE 5. BMP DESIGN CRITERIA
BMP Hydrology
C = runoff coefficient
I = water quality
treatment intensity
A = acreage
Flow-based: Q=CIA
BMP Option
Filterra Roof Drain
Biofiltration Vault
BMP Treated
Flow Capacity
0.06 cfs (0.3 acre
max)
Project Treatment
Criteria
C= 1.0
I = 0.2 in/hour
A - 0.194 acres
Q = 0.039 cfs
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5. PROJECT BMP PLAN IMPLEMENTATION
This section identifies the recommended BMP options that meet the applicable storm water and
water quality ordinance requirements. This includes incorporating BMPs to minimize and
mitigate for runoff contamination and volume from the site.
Construction BMPs
During construction, BMPs such as silt fences, sand bags, gravel bags, fiber rolls, and other
erosion control measures may be employed consistent with the City of Carlsbad Tier 2 Storm
Water Pollution Prevention Plan (SWPPP). Note that permit coverage per the General
Construction Permit is not required since the site disturbance is less than 1 acre. The objectives
of the Tier 2 SWPPP are to:
• Identify all pollutant sources, including sources of sediment that may affect the water
quality of storm water discharges associated with construction activity from the
construction site;
• Identify non-storm water discharges;
• Identify, construct, implement in accordance with a time schedule, and maintain BMPs to
reduce or eliminate pollutants in storm water discharges and authorized non-storm water
discharges from the construction site during construction; and
• Develop a maintenance schedule for BMPs installed during construction designed to
reduce or eliminate pollutants after construction is completed (post-construction BMPs).
Recommended Post-Construction BMP Plan
PDC has identified a recommended water quality BMP plan for the Major Building 'B' Project.
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The recommended post-construction BMP plan includes LID site design, source control, and
treatment BMPs. The site design BMP options include reduction of impervious surfaces,
minimization of directly connected impervious areas, and water conservation. The source
control BMPs include inlet stenciling and signage, efficient irrigation, and integrated pest
management principles. The treatment BMP selected for this project is one proposed Filterra
Roof Drain Biofiltration Vault. All runoff will be treated via the existing Jensen Precast
Stormwater Interceptor per the previous Bressi Commercial project.
Operation and Maintenance Plans
The City Municipal Code requires a description of the long-term maintenance requirements of
proposed BMPs and a description of the mechanism that will ensure ongoing long-term
maintenance. Operation and maintenance plans for the recommended post-construction BMP for
this project are located in Appendix 4. The Project BMP costs and the maintenance funding
sources are provided in the following section.
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6. PROJECT BMP COSTS AND FUNDING SOURCES
Table 6 below provides the anticipated capital and annual maintenance costs for the selected
BMPs.
TABLE 6. BMP COSTS
BMP OPTION
Filterra Roof Drain
Biofiltration Vault
(FTRD 8x3)
Estimated Capital Costs
$12,500 + installation
Approximate Annual
Maintenance Costs
$500-$ 1,000
The Developer will incur the capital cost for the BMP installation. The responsible party for
long-term maintenance and funding is the Property Management Association.
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APPENDIX 1
Storm Water Standards Questionnaire
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Y OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Engineering Department
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
I INSTRUCTIONS:
I 1. Is your project a significant redevelopment?
2. If your project IS considered significant redevelopment, then please skip Section 1 and proceed with Section 2.
3. If your project IS NOT considered significant redevelopment, then please proceed to Section 1.
This questionnaire must be completed by applicant in advance of submitting for a development application (subdivision
and land use planning approvals and construction permits). The results of the questionnaire determine the level of
storm water pollution prevention standards applied to a proposed development or redevelopment project. Many
aspects of project site design are dependent upon the storm water pollution protection standards applied to a project.
Applicant 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.
A staff determination that the development application is subject to more stringent storm water standards than initially
assessed by the applicant, will result in the return of the development application as incomplete.
If applicants are unsure about the meaning of a question or need help in determining how to respond to one or more of
the questions, they are advised to seek assistance from Land Development Engineering staff.
A separate completed and signed questionnaire must be submitted for each new development application submission.
Only one completed and signed questionnaire is required when multiple development applications for the same project
are submitted concurrently. In addition to this questionnaire, applicants for construction permits must also complete,
sign and submit a Construction Activity Storm Water Standards Questionnaire.
To address pollutants that may be generated from new development, the city requires that new development and
significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs)
into the project design, which are described in Section 2 of the city's Storm Water Standards Manual This
questionnaire should be used to categorize new development and significant redevelopment projects as priority or
non-priority, to determine what level of storm water standards are required or if the project is exempt.
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Definition:
Significant redevelopment is defined as the creation or addition of at least 5,000 square feet of impervious surface
on an already developed site.
Significant redevelopment includes, but is not limited to: the expansion of a building footprint; addition to or
replacement of a structure; structural development including an increase in gross floor area and/or exterior
construction remodeling; replacement of an impervious surface that is not part of a routine maintenance activity; and
land disturbing activities related with structural or impervious surfaces. Replacement of impervious surfaces includes
any activity that is not part of a routine maintenance activity where impervious material(s) are removed, exposing
underlying soil during construction.
Note: If the Significant Redevelopment results in an increase of less than fifty percent of the impervious surfaces of a
previously existing development, and the existing development was not subject to SUSMP requirements, the numeric
sizing criteria discussed in Table 3 of 2.3.3.4 applies only to the addition, and not to the entire development
E-34 Page 1 of 3 REV 1/22/10
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CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Engineering Department
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
SECTION 1 NEW DEVELOPMENT
PRIORITY PROJECT TYPE
Does your project meet one or more of the following criteria:
1. Home subdivision of 100 units or more.
Includes SFD, MFD, Condominium and Apartments
2. Residential development of 10 units or more.
Includes SFD, MFD, Condominium and Apartments
3. Commercial and industrial develooment Greater than 100.000 sauare feet indudina oarfc/no areas.
Any development on private land that is not for heavy industrial or residential uses. Example: Hospitals, Hotels,
Recreational Facilities, Shopping Malls, etc.
4. Heaw Industrial / Industry greater than 1 acre (NEED SIC CODES FOR PERMIT BUSINESS TYPES)
SIC codes 5013. 5014. 5541, 7532-7534. and 7536-7539
5. Automotive repair shoo.
SIC codes 5013. 5014, 5541, 7532-7534, and 7536-7539
6. A New Restaurant where the land area of develooment is 5. 000 sauare feet or more indudina oarkina areas.
SIC code 581 2
7. Hillside development
(1) greater than 5,000 square feet of impervious surface area and (2) development will grade on any natural
slope that is 25% or greater
8. Environmentally Sensitive Area (ESA).
Impervious surface of 2,500 square feet or more located within, "directly adjacent"2 to (within 200 feet), or
"discharging directly to"3 receiving water within the ESA1
9. Parking lot.
Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban runoff
10. Retail Gasoline Outlets - servina more than 100 vehicles per day.
Serving more than 100 vehicles per day and greater than 5,000 square feet
11. Streets, roads, highways, and freeways.
Project would create a new paved surface that is 5,000 square feet or greater.
12. Coastal Development Zone.
Within 200 feet of the Pacific Ocean and (1) creates more than 2500 square feet of impermeable surface or (2)
increases impermeable surface on property by more than 10%.
13. More than 1-acre of disturbance.
Project results in the disturbance of more than 1-acre or more of land and is considered a Pollutant-generating
Development Project*.
YES
X
X
NO
X
><
X
X
X
X
X
xf
X,
X
X
1 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 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; and any other equivalent
environmentally sensitive areas which have been Identified by the co-permittees.
2 -Directly adjacent' means situated within 200 feet of the Environmentally Sensitive Area.
3 "Discharging directly to* means outflow from a drainage conveyance system that Is composed entirely of flows from the subject development or redevelopment site, and
not commingled with flow from adjacent lands.
4 Pollutant-generating Development Projects are those projects that generate pollutants at levels greater than background levels. In general, these Include all projects
areas that require routine use of fertilizers and pesticides. In most cases linear pathway projects that are for infrequent vehicle use, such as emergency or maintenance
access, or for pedestrian or bicycle use, are not considered Pollutant-generating Development Projects If they are built with pervious surfaces or if they sheet flow to
surrounding pervious surfaces.
Section 1 Results:
If you answered YES to ANY of the questions above you have a PRIORITY project and PRIORITY project requirements DO apply.
A Storm Water Management Plan, prepared in accordance with City Storm Water Standards, must be submitted at time of
application. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3.
If you answered NO to ALL of the questions above, then you are a NON-PRIORITY project and STANDARD requirements apply.
Please check the "DOES NOT MEET PRIORITY REQUIREMENTS" box in Section 3.
E-34 Page 2 of 3 REV 1/22/10
CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Engineering Department
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
| SECTION 2~SIGNIFICANT REDEVELOPMENT
Complete the questions below regarding your redevelopment project YES NO
1. Project results in the disturbance of more than 1 -acre or more of land and is considered a Pollutant-generating
Development Project (see definition in Section 1)
I
If you answered NO, please proceed to question 2.
If you answered YES, then you ARE a significant redevelopment and you ARE subject to PRIORITY project requirements. Please
check the "MEETS PRIORITY REQUIREMENTS" box in Section 3 below.
2.Is the project redeveloping an existing priority project type? (Priority projects are defined in Section 1 )
If you answered YES, please proceed to question 3.
If you answered NO then you ARE NOT a significant redevelopment and you ARE NOT subject to PRIORITY project requirements,
only STANDARD requirements. Please check the "DOES NOT MEET PRIORITY REQUIREMENTS' box in Section 3 below.
3.Is the project solely limited to one of the following:
a. Trenching and resurfacing associated with utility work?
b. Resurfacing and reconfiguring existing surface parking lots?
c. New sidewalk construction, pedestrian ramps, or bike lane on public and/or private existing roads?
d. Replacement of existing damaged pavement?
If you answered NO to ALL of the questions, then proceed to question 4.
If you answered YES to ONE OR MORE of the questions, then you ARE NOT a significant redevelopment and you ARE NOT subject
to PRIORITY project requirements, only STANDARD requirements. Please check the 'DOES NOT MEET PRIORITY
REQUIREMENTS' box in Section 3 below.
4. Will the development create, replace, or add at least 5,000 square feet of impervious surfaces on an existing
development, or be located within 200 feet of the Pacific Ocean and (1) create more than 2500 square feet of
impermeable surface or (2) increase impermeable surface on property by more than 10%?
If you answered YES, you ARE a significant redevelopment and you ARE subject to PRIORITY project requirements. Please check
the "MEETS WITH REQUIREMENTS" box in Section 3 below.
If you answered NO, you ARE NOT a significant redevelopment, and you ARE NOT subject to PRIORITY project requirements, only
STANDARD requirements. Please check the 'DOES NOT MEET PRIORITY REQUIREMENTS" box in Section 3 below.
rL
| SECTION 3
Questionnaire Results:
)Sf MY PROJECT MEETS PRIORITY REQUIREMENTS. MUST COMPLY WITH PRIORITY PROJECT STANDARDS AND MUST
PREPARE A STORM WATER MANAGEMENT PLAN FOR SUBMITTAL AT TIME OF APPLICATION.
D MY PROJECT DOES NOT MEET PRIORITY REQUIREMENTS AND MUST ONLY COMPLY WITH STANDARD STORM
WATER REQUIREMENTS.
Applicant Information and Signature Box
Address: g^^s; &u>ek. Cgm«ffrci*X, Assessor's Parcel
Numbers): B«»'Uw^ S> •2-i3-(<?/-2./-00
Applicant Name: ;&/iUkw jvs^yiNiB £»/•
Applicant Signature:
Applicant Title:
j"K*3Brc"l '"t.AMA^CK,
Date:
t\*x.\U
This Box for City Use Only
Yes No
By:
Date:
Project ID:
E-34 Page 3 of 3 REV 1/22/10
1
APPENDIX 2
Project Maps
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CITY OF OCEANSIDE
HIGHWAY
VISTA
CITY OF
SAN MARCOS
PACIFIC
OCEAN
CITY OF ENCINITAS
VICINITY MAP
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APPENDIX 3
Supplemental BMP Information
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fi [terra
Bioretention Systems
Filterra* Roofdrain Stormwater Treatment System
A Greenroof at Ground Levef
Filterra® Roofdrain System
The Filterra Roofdrain System treats piped in stormwater runoff
from rooftops. Using bioretention filtration the system captures and
immobilizes pollutants of concern such as;TSS, nutrients and metals.
Stormwater continues to flow through the media and into the
underdrain system, where treated water is discharged. Higher flows
bypass the bioretention treatment via an overflow/bypass pipe
design.
Features and Benefits
Best Value for Rooftop Treatment.
• compact size
• needs no external bypass
• easy installation
• simple maintenance
Versatile.
Filterra Roofdrain can be used for:
• new construction
• retrofits
• commercial or residential applications.
Filterra Roofdrain can be placed:
• At grade
• Slightly above grade to meet elevation challenges of
high water tables
• Install next to or away from your building
Maintenance. Maintenance is simple and safe (at ground level), and
the first year is provided FREE with the purchase of every unit. The
procedure is so easy you can perform it yourself.
Protection. The Filterra Roofdrain's hydraulic configuration was
tested by the Colorado State University Hydraulics Laboratory.
Below grade treatment using Filterra roofdrain avoids the slipping
hazard liabilities of daylighted roofdrains during freezing weather.
Protect from erosion with Filterra's monolithic water tight design.
Expected Pollutant Removal
(Ranges Varying with Particle Size, Pollutant Loading and Site Conditions)
TSS Removal
Phosphorus Removal
Zinc Removal
Copper Removal
Nitrogen Removal
TPH* Removal
85%
60% -70%
> 66%
>58%
42% -45%
> 93%
"Total Petroleum Hydrocarbons
Information on the pollutant removal efficiency of the filter soil/plant
media is based on third party lab and field studies.
Filterra media has been TAPE and TARP tested and approved.
1. Influent Pipe from Roof Leader
2. Erosion Control Device
3. Protective Mulch Layer
4. Perforated Underdrain for Treatment Flows
5. Cast Iron Tree Grate for Maintenance Access
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Bioretention Systems
Filterra* Roofdrain Stormwater Treatment System
A Greenroof at Ground Level"
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Design Guidelines
1) Use the Filterra Roofdrain Design Guidance as a reference available
from design@filterra.com.
2) Select Filterra Roofdrain model according to your Regional Sizing
Table, and according to the building's roof drainage area and associated
roof drain pipe sizes.
3) Determine Filterra Roofdrain Placement next to a building, or away
from your building.
4) Ensure piping to and from Filterra Roofdrain system is free-draining
at minimum 1% slope, or per local codes.
Placement Review
Because we want your project with Filterra to be a great success, we
respectfully require that each Filterra Roofdrain project be reviewed
by our placement/design staff. This review is mandatory, as proper
placement ensures you of the most efficient and cost effective solution,
as well as optimum performance and minimal maintenance
Proper Placement
1) Pipe flow of the Filterra Roofdrain System eliminates the cross-
linear flow requirements necessary with standard Filterra.
2) Filterra Roofdrain Systems should only receive piped in runoff.
3) Rooftop drainage should still be designed with emergency bypass
relief prior to the Filterra Roofdrain System (e.g.: rooftop scuppers,
etc.)
Always follow local plumbing codes for roof drainage requirements.
The Filterra System is not a substitute for rooftop overflow/bypass.
4) Send completed project information form along with plans to
Filterra for placement and application review.
Filterra Roofdrain System
One pipe in, one pipe out, with internal high-flow bypass.
Western Region Support Corporate Headquarters & Eastern Region Support
34428 Yucaipa Blvd., Suite E-312 11352 Virginia Precast Road
Yucaipa, CA 92399 Ashland, VA 23005
Toll Free: (866) 349-3458 • F: (804) 798-8400
E-mail: design@filterca.com • Web: www.filterta.com
Filterra' is protected by U.S. Patents 16,277,274,16,569,321 & 7,625,485. Other patents pending.
Filterra* is a division of
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Filterra Roofdrain System
Design Guidelines
Sizing
Identify the maximum contributing drainage area to each Filterra Roofdrain unit and compare to
the Regional Sizing Table for the project's location. The Filterra's filter surface area will be sized
according to local regulations for water quality treatment.
Identify the maximum expected flow for the ordinary roof drain piping. This is often the 010 storm,
but may vary according to location and local plumbing codes. This flow rate will determine the
influent and effluent pipe size of the Filterra Roofdrain system (between 6-inch and 10-inch
diameter).
Placement
Determine an appropriate location for the Filterra Roofdrain system, according to elevation
available on site, site layout and aesthetics. The Invert Out depth of a Filterra Roofdrain system
may be calculated by adding 3.5 feet to the influent pipe size. For example a 6'x4' Filterra
Roofdrain system with 6-inch influent pipe will have a Top of Slab to INV OUT height of 4.0 feet. It
is possible to have the top of the Roofdrain system above grade to help with challenging
elevations on site, although at minimum, the effluent pipe from the system should be below
grade.
The Filterra Roofdrain top slab is not designed to be traffic loaded and so should be placed
accordingly. The system is not designed to act as a yard drain/grated inlet through the tree grate;
please design for piped in runoff only. The system should be designed and installed plumb and
level.
Piping
Ensure piping to and from Filterra Roofdrain system is free-draining at minimum 1 % slope, or per
local codes. Please refer to the Filterra drawing FTRD-IPC that shows available inlet piping
configurations and model numbers. At minimum, the effluent pipe from the system should be
below grade.
An emergency bypass relief must be incorporated into the roofs drainage design, upstream of the
Filterra Roofdrain system. For example a 'wye' on the downspout is often used. This element
should be in addition to the standard code design of rooftop overflow, such as scuppers or a
secondary piping system. Always follow local plumbing codes for roof drainage requirements. The
Filterra System is not a substitute for rooftop overflow/bypass.
Placement Review
Because we want your project with Filterra to be a great success, we respectfully require that
each Filterra Roofdrain project be reviewed by our placement/design staff. This review is
mandatory, as proper placement ensures you of the most efficient and cost effective solution, as
well as optimum performance and minimal maintenance. Please send completed project
information form along with plan sheets (storm layout, drainage areas, profile etc) to Filterra for
placement and application review.
Methods of sending information for review are as follows:
Email: design@filterra.com Mail or other:
AutoCAD or PDF files Americast - Filterra Review
Fax: (804) 798-8400 11352 Virginia Precast Road
FTP Site: contact Filterra for details Ashland, Virginia 23005
www.filterra.com
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fiuerra
A Growing Idea in Stormwattr Filtration.
Table 2: Filterra® Roofdrain (FTRD)
Standard Sizing Table (where C = 1.0)
Southern California ONLY - (0.2 in/hr Uniform Intensity Approach)
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Available Filterra®
Roofdrain Box Sizes
(feet)
FTRD 4x4
FTRD 6.5x4
FTRD 8x4
FTRD 12x4
FTRD 6x6
FTRD 8x6
FTRD 10x6
FTRD 12x6
Total Contributing
Drainage Area (acres)
up to 0.19
0.20 to 0.30
0.31 to 0.37
0.38 to 0.56
0.38 to 0.42
0.38 to 0.56
0.57 to 0.70
0.71 to 0.83
Bypass Pipe Size /
Max. Flow (cfs)
6"PVC/1.15cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs or
10" PVC / 3.80 cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs or
10" PVC/ 3.80 cfs
6" PVC/ 1.1 5 cfs or
8" PVC / 2.25 cfs or
10" PVC / 3.80 cfs
6" PVC/ 1.15 cfs or
8" PVC / 2.25 cfs or
10" PVC/ 3.80 cfs
Notes:
1. All boxes are a standard 3.5 feet depth (INV to TC), plus the depth of bypass pipe,
e.g. FTRD - 6.5x4 unit with 8" pipe has INV to TC = 4.17' (FTRD 6.5x4 - 8)
2. A standard PVC pipe coupling is cast into the box wall for simple connection.
3. Size dimensions shown are internal. Please add 1' to each for external (using 6" walls)
4. For Commercial Developments a minimum (runoff coefficient) C factor of 0.85 is required.
Most roof drain application require use of C = 1.0 or C = 0.95
5. Please ask for Sizing Tables for other target treatment goals, e.g. 0.3 in/hr
1-27-10 /v01 www.fllterra. com Toll Free: (866) 349-3458
1
AVAILABLE PIPE
CONFIGURATION
BOX SIZE
FTRD 4X4
X
4'
Y
4'
AVAILABLE
PIPE SIZE
6"
EXAMPLE MODEL #: FTRD 4X4-6A PLAN VIEW
BOX SIZE
FTRD 6.5X4
FTRD 8X4
FTRD 12X4
X
6'-6"
8'
12'
Y
4'
4'
4'
AVAILABLE
PIPE SIZE
6". 8"
6". 8"
6", 8"
AVAILABLE PIPE
CONFIGURATION
B
C
D
EXAMPLE MODEL #: FTRD 8X4-8B
PLAN VIEW
AVAILABLE PIPE
CONFIGURATION
BOX SIZE
FTRD 6X6
FTRD 8X6
FTRD 10X6
FTRD 12X6
X
6'
8'
10'
12'
Y
6'
6'
6'
6'
AVAILABLE
PIPE SIZE
6", 8", 10"
6". 8". 10"
6". 8". 10"
6". 8". 10"£
EXAMPLE MODEL #: FTRD 12X6-10D PLAN VIEW
ENGINEER TO SPECIFY ONE (1) INLET PIPE LOCATION (A. B, C. OR D).
A PVC COUPLING WILL BE CAST INTO THE WALL (BY AMERICAST) FOR HELD CONNECTION (BY CONTRACTOR)
MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA
DATE: 01-20-10 DWG: SOCAL FTRD IPC- 1
Copyright C 2007 by American
FILTERRA® ROOFDRAIN PVC
INLET PIPE COUPLING LOCATIONS
SOUTHERN CALIFORNIA REGION us PAT 6.277.274AND 0,009,0^ 1
6"
CO
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8'-0"
&T -<"H_,rir^
r-\
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PLAN VIEW
CLEANOUT COVER
CAST IN TOP SLAB
PVC PIPE (BY
CONTRACTOR)
TREE FRAME & GRATE
CAST IN TOP SLAB
PLANT AS SUPPLIED
BY AMERICAST
(NOT SHOWN
FOR CLARITY)
TOP SLAB
FILTERRA TAPE/TARP
APPROVED MEDIA
PROVIDED BY
AMERICAST
MULCH PROVIDED BY AMERICAST
PERFORATED UNDERDRAIN SYSTEM BY AMERICAST
UNDERDRAIN STONE PROVIDED BY AMERICAST
PVC PIPE
(BY CONTRACTOR)
SECTION A-A
MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED
BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF RLE FORMAT.
Copyright O 2007 by Amcricast
DATE: 03-01-10 DWG: FTRD 8x3 88
8x3' PRECAST FILTERRA® UNIT
ROOF DRAIN CONFIGURATION
WITH 8" PVC PIPED IN US PAT 6,277,274
AND 6,569,321
APPENDIX 4
Operation and Maintenance Plan
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Maintenance
Simple maintenance of the Filterra® is required to continue effective pollutant removal from
stormwater runoff before discharge into downstream waters. This procedure will also extend the
longevity of the living biofilter system. The unit will recycle and accumulate pollutants within
the biomass, but is also subjected to other materials entering the throat. This may include trash,
silt and leaves etc. which will be contained within the void below the top grate and above the
mulch layer. Too much silt may inhibit the Filterra's® flow rate, which is the reason for site
stabilization before activation. Regular replacement of the mulch stops accumulation of such
sediment.
Americast includes a 1-year maintenance plan with each system purchase. Annual maintenance
consists of a maximum of two (2) scheduled visits. The start of the maintenance plan begins
when the system is activated for full operation. Full operation is defined as the unit installed,
curb and gutter and transitions in place and activation (by Supplier) when mulch and plant are
added and temporary throat protection removed . Activation cannot be carried out until the site is
fully stabilized (full landscaping, grass cover, final paving and street sweeping completed).
Maintenance visits are scheduled seasonally; the spring visit aims to clean up after winter loads
including salts and sands. The fall visit helps the system by removing excessive leaf litter.
Some sites may be subjected to extreme sediment or trash loads, requiring more frequent
maintenance visits. This is the reason for detailed notes of maintenance actions per unit, helping
the Supplier and Owner predict future maintenance frequencies, reflecting individual site
conditions.
Owners must promptly notify the (maintenance) Supplier of any damage to the plant(s), which
constitute(s) an integral part of the bioretention technology. Owners should also advise other
landscape or maintenance contractors to leave all maintenance to the Supplier (i.e. no pruning or
fertilizing).
Exclusion of Services
It is the responsibility of the owner to provide adequate irrigation year around to the plant of the
Filterra® system.
Clean up due to major contamination such as oils, chemicals, toxic spills, etc. will result in
additional costs and are not covered under the Supplier maintenance contract. Should a major
contamination event occur, the Owner must block off the outlet pipe of the Filterra® (where the
cleaned runoff drains to, such as drop-inlet) and block off the throat of the Filterra®. The
Supplier should be informed immediately.
12/29/04 www.filterra.com
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Extended Maintenance Contracts filterra'
Extended maintenance contracts are available from the Supplier. Contact Americast for details
and pricing.
Maintenance Visit Summary
Each maintenance visit consists of the following simple tasks (detailed instructions below).
A. Filterra® unit inspection
B. Foreign debris, silt, mulch & trash removal
C. Filter media evaluation and recharge as necessary
D. Plant health evaluation and pruning or replacement as necessary
E. Replacement of mulch
F. Disposal of all maintenance refuse items
G. Maintenance records updated and stored (reports available upon request)
Maintenance Tool List
Ideal tools include a camera, gloves, bucket, shovel, broom, pruners, hoe/rake and tape measure.
Most visits require only replacement mulch. Three bags of shredded hardwood mulch are used
per unit (on a standard 6x6' size).
Some visits may require additional Filterra® engineered soil media available from the Supplier.
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Maintenance Visit Detail
A. Filterra® unit inspection
I2/1W04
Record individual unit before maintenance with photograph (numbered).
Record on Maintenance Report (see example in this document) the following:
Standing Water
Damage to Box Structure
Damage to Grate
Is Bypass Clear
Notes
Y/N
Y/N
Y/N
Y/N
If yes answered to any of these observations, record with close-up photograph
(numbered).
www.filterra.com
t~* "<-,
B. Foreign debris, silt, mulch & trash removal
Remove metal grates for access into Filterra" box.
-,**r "j#
fi [terra*
Remove the mesh that protects the mulch layer, taking care to avoid damage to
the mesh and the plant.
out silt (if any) and mulch and remove trash & foreign items.
wvvvv.lllterra.com
Record on Maintenance Report the following:
Silt -'Clay
Cups Bags
Leaves
# Buckets Removed
Notes
Y/N
Y./'N
Y/N
#
filterra
Filter media evaluation and recharge as necessary
After removal of mulch and debris, measure distance from the top of the Filterra"
engineered media soil to the bottom of the top slab. If this distance is greater than
12", add Filterra" media (not top soil or other) to recharge to a 9" distance.
Record on Maintenance Report the following:
Distance to Bottom of Ton Slab
Buckets of Media Added
(inches)
D. Plant health evaluation and pruning or replacement as necessary
F.xamine the plant's health and replace if dead.
www.lllterra.com
Record on Maintenance Report the following:
Height above Grate
Width at Widest Point
Health
Damage to Plant
Plant Replaced
Notes
(feet)
(feet)
Alive/Dead
Y/N
Y/N
filterra
Replacement ol Mulch
Add shredded hardwood mulch across the entire unit to a depth of 3".
Replace the protective mesh carefully over the plant.
Ensure correct position of erosion control stones by the Filterra" inlet.
Replace Filterra" grates correctly.
F. Disposal of all maintenance refuse items
Clean area around unit and remove all refuse to be disposed of appropriately.
G. Maintenance records updated and stored (reports available upon request)
Deliver Maintenance Report and photographs to appropriate location (normally
Americast during maintenance contract period). Some jurisdictions may require
submission of maintenance reports in accordance with approvals. It is the
responsibility of the Owner to comply with local regulations.
www.filtcrra.com
Filterra® Project Maintenance Order
Project
Address
Directions
Project
Owner
Company
Contact Name
Telephone #
Owner Notified
of Mtce on (date)
Filterra Units on this Order
Total Units on this Project
Date of Maintenance
Arrival Time
Departure Time
# of Workers
Notes on Project
Maintenance Supervise
12/14/04
Filterra® Structure Maintenance Report
Project
Plant Type
Structure Number
Structure Size
Initial Observations
GPS
Pre Mice Photo #
Standing Water Y
IF Yes, STOP NOW & call 804-798-6068
N
Damage to Box Structure Y N
If YES to any observation take close up photo
Waste
Damage to Grate Y N
Is Bypass Clear Y N
Notes
Silt / Clay
Cups/Bags
Leaves
Other
Y N
Y N
Y N
Buckets Removed (# of)
Notes
Media
Distance to Bottom of Top Slab (in.)
Buckets of Media Added (# of)
Notes
Mulch
Netting Replaced
Stones Replaced
Y
Y
N
N
Bags of Mulch Added (# of)
Notes
Other Notes
(use back if necessary)
Plant #1 ! (#2)
Height above Grate (feet) j Plant Replaced
Width at Widest Point (feet) ; Notes
Health Alive/Dead-; Alive/Dead
Damage to Plant Y/N ! Y/N
If YES to plant damage take close up photo
#1 ; (#2)
Y/N | Y/N
12/14/04