HomeMy WebLinkAbout18 - Design Report - Safeway Fuel Station #2999 - Stormwater STORMWATER SITE PLAN
Safeway Fuel Station #2999
Northeast Corner of North 19th Avenue and West Main Street
Bozeman, Montana
Prepared for:
Safeway Inc.
1121 - 124th Avenue N.E.
Bellevue, WA 98005
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I Revised July 11 , 2018
Revised April 11 , 2018
,- 3 261G November 18, 2013
i MENT OF Our Job No. 16425
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TABLE OF CONTENTS
1.0 PROJECT OVERVIEW
1.1 Purpose and Scope
12 Pn+Deva|opedCond|Uona
1.3 PootOava|opedCondiUona
2.0 PRELIMINARY CONDITIONS SUMMARY
2.1 General Requirements
2.2 Drainage Basin
2.3 Soil Conditions
3.0 C)FF'G|TEANALY8|S
3.1 Upstream Tributary Area
3.2 Downstream Analysis
4.0 RETENTION/DETENTION ANALYSIS AND DESIGN
4.1 Existing Site Hydrology
4.2 Developed Site Hydrology
4.3 Hydrologic Analysis
4.4 Rehenbon/OebanUon8ystem
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
5.1 On-Site Conveyance System
6.0 SPECIAL REPORTS AND STUDIES
7.0 OPERATIONS AND MAINTENANCE MANUAL
9.0 CONCLUSION
TABLE OF EXHIBITS
EXHIBIT A-VICINITY MAP
EXHIBIT B-SCS SOILS MAP
EXHIBIT C-PRE-DEVELOPED BASIN MAP
EXHIBIT D-DEVELOPED CONDITIONS BASIN MAP
EXHIBIT E-RETENTION/DETENTION ANALYSIS AND DESIGN
EXHIBIT F-CONVEYANCE ANALYSIS
EXHIBIT G-OPERATIONS AND MAINTENANCE MANUAL
EXHIBIT H -FEMA MAP
EXHIBIT I-DOWNSTREAM DRAINAGE PATH MAP
16425.001.doc
Tab 1 . 0
1.0 PROJECT OVERVIEW
1.1 Purpose and Scope
The proposed Safeway Fuel Center#2999 project consists of approximately 0.8 acres of
land located at the northeast corner of N 19th Avenue and W Main Street in the City of
Bozeman. The existing site is currently used as a casino with associated landscaping,
parking and utilities. Please see the vicinity map included as Exhibit A. This report
provides site information and an analysis used to design the stormwater facilities that will
provide the detention, water quality, and conveyance for approximately 0.8 acres
pursuant to development. This report is based on the requirements of the March 2004
Design Standards and Specifications Policy for the City of Bozeman.
1.2 Pre-Developed Conditions
The proposed project site consists of 0.8 acres of land located at the southwest corner of
the existing Safeway store development. The existing site includes a casino building with
associated driveways, parking, landscape and utilities. The project site is bounded by N
19th Avenue to the west, W Main Street to the south, an existing access drive to the north
and the Safeway development and parking lot to the east. The pre-developed site is
highest in the middle at the building, with runoff directed toward the surrounding curb line.
It appears runoff is directed to the northwest corner of the site where there is an area of
rock and a storm water manhole or vault. The structure was full of sediment so it is
difficult to determine but it is assumed that the site discharges to the existing conveyance
system within N 19th Avenue. Further field investigation has determined there is no
working discharge from this site. The structure and pipes are plugged with sediment and
an outflow path cannot be determined. It is assumed most runoff infiltrates on site with
the existing structure used for emergency overflow only.
1.3 Post Developed Conditions
The proposal for this project is to construct a gas station with a fuel island canopy, kiosk
and an additional retail space. The project would also include a pedestrian plaza at the
southwest corner adjacent to the N 19th Avenue and W Main Street intersection.
Approximately 0.8 acres of the developed site will be collected and conveyed to one of
the proposed infiltration basins. A rain garden is proposed south of the proposed
building that would collect surface runoff from the adjacent landscaping and runoff from
the building roof. Water would be allowed to infiltrate through the soil and/or pond
approximately 6 - 12 inches. The fueling area under the canopy is graded to drain to a
catch basin in the northwest corner of the canopy. The under canopy drainage will be
conveyed through an oil/water separator before entering another proposed basin at the
northwest corner of the site. Site runoff will be directed to this same basin at the
northwest corner of the site for infiltration.
The infiltration system has been sized to infiltrate the 10-year, 2-hour storm intensity
event in the post-developed condition required by the City of Bozeman design manual.
16425.001.doc
Tab
2.0 PRELIMINARY CONDITIONS SUMMARY
2.1 General Requirements
The proposed development requires a lot line adjustment.
2.2 Drainage Basin
A review of the topographic map and city record information assumes that runoff from the
site flows west into the existing underground conveyance system in N 19th Avenue. This
conveyance system flows north, eventually discharging to the East Gallatin River.
After further site investigation, it cannot be determined that runoff from this site is directed
to N 19th Avenue. It is assumed runoff infiltrates on site and only emergency overflows
are directed to N 19th Avenue.
2.3 Soil Conditions
The USDA soil mapping for the City of Bozeman classifies the onsite soils as Urban
Soils, which usually means the study area was already developed when the soil study
was conducted.
Per the Geotechnical Engineering Report by Terracon for the adjacent Safeway Store
development, the existing soil conditions consist of a layer of fill over a shallow clay layer
over a medium dense to dense gravel. The groundwater depth in the vicinity of this
project is approximately 18.7 feet deep.
Please see Exhibit B SCS soils map.
16425.001.doc
Tab
3.0 OFF-SITE ANALYSIS
3.1 Upstream Tributary Area
There is no upstream basin contributing runoff to this site except for the adjacent right-of-
way from the back of the sidewalk. The existing Safeway store development handles its
own runoff as well as some of the existing landscape runoff from this site.
3.2 Downstream Analysis
This site discharges during peak storm events, at the northwest corner into the existing
storm drainage conveyance system in N 19th Avenue. Runoff is conveyed north in N 191h
Avenue in a 66" diameter pipe north to Oak Street. Runoff is directed east in Oak and
discharged north into a small stream/drainage channel. This drainage channel continues
north, combining with another stream and eventually discharges into the East Gallatin
River.
Please refer to the attached Downstream Drainage Path Map, Exhibit I.
Because no reliable outlet from this site could be found, it is assumed most runoff
infiltrates on site.
16425.001.doc
Tab 4 . 0
4.0 RETENTION/DETENTION ANALYSIS AND DESIGN
4.1 Existing Site Hydrology
The project site is an existing casino with associated parking, landscape and utilities. For
the most part the site slopes from the center of the site to the north, east and west. The
runoff is directed to the northwest corner of the site to a rock area with a storm water
manhole or vault. It is assumed most runoff infiltrates on site and the existing structure is
for emergency overflow conditions.
4.2 Developed Site Hydrology
Under developed conditions, the existing building will be demolished, and the entire site
will be graded relatively flat to tie-in the existing Safeway store site. The proposed
project consists of a fuel station canopy over the fueling islands, a kiosk and a retail
space. Also included in this re-development project is a pedestrian oriented space at the
northeast corner of the N 191h Avenue and W Main Street intersection.
Runoff will be routed to one of the infiltration basins for treatment and flow control. The
storm drainage proposal conforms to the requirements of the 2004 City of Bozeman
Design Standards and Specifications Policy requirements.
4.3 Hydrologic Analysis
The infiltration pond sizing was computed using the methodology from the 2004 Design
Standards and Specifications Policy. The infiltration pond must be sized for the runoff
rate from the 10-year/2-hour storm event. The infiltration basins are sized to
accommodate the runoff directed to them.
4.4 Retention/Detention System
This project proposes to use an infiltration basin on the south side of the project to collect
runoff from the building roof and surrounding landscaping. Runoff will infiltrate through
the soil and will pond 6 - 12 inches. The roof from the canopy and the parking lot surface
flow will be directed to the northwest corner. The under canopy drainage will be sent
through an oil/water separator for additional water quality treatment prior to being
discharged to the infiltration pond. A gate valve is also proposed downstream of the
oil/water separator so that it can be closed in case of an accidental fuel spill.
The calculations to show that detention is not required, as well as sizing the infiltration
basins can be seen in Exhibit E Retention/Detention Analysis and Design.
16425.001.doc
Tab 5 . 0
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
5.1 On-Site Conveyance System
The conveyance system capacity was designed using the rational method and the 25-yr
design storm. See Exhibit F, Conveyance Analysis. All of the pipes are free-flowing with
no surcharge.
16425.001.doc
Tab 6 . 0
6.0 SPECIAL REPORTS AND STUDIES
The following report has been prepared for this project site to date:
• Traffic Analysis by Morrison Maierle, Inc. dated November 7, 2013
16425.001.doc
Tab 7 . 0
7.0 OPERATIONS AND MAINTENANCE MANUAL
See Exhibit G.
16425.001.doc
Tab 8 . 0
8.0 CONCLUSION
This proposal meets all the requirements of the City of Bozeman as mentioned in the 2004
Design Standards and Specifications Policy. Therefore, this project should be accepted as
proposed.
16425.001.doc
Exhibit A
Vicinity Map
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Totals for Area of Interest 1.3 100.0%
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Exhibit C
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Exhibit E
Retention/Detention
Analysis and Design
Site Summary
Retention Volume (10-year, 2-hour storm)
Q = CIA
V= 7,200 Q (cf)
C = weighted C factor
I =0.41 in/hr
A= area (acres)
Q = runoff(cfs)
V=volume (cf)
Infiltration Basin#1
Basin Area C Q = GI A
CB#1 0.06 0.35 = (0.60) (0.41)(0.36)
CB#2 0.12 0.60 Q = 0.08856 cfs
B#3 0.03 0.90
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Roof 0.07 0.90 V= 638 cf required
Total 0.36 ac V= 797 cf provided
Weighted C =0.60
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CB#5 0.06 0.90 Q=0.1279 cfs
Canopy 0.10 0.90
NW 0.08 0.30 V= 7,200 Q
V= 921 cf required
Total 0.40 ac
V= 946.5 cf provided
Weighted C = 0.78
16425.001.doc
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Exhibit G
Operations and Maintenance
Manual
OPERATIONS AND MAINTENANCE MANUAL
Safeway Fuel Station #2999
Northeast Corner of North 19th Avenue and West Main Street
Bozeman, Montana
Prepared for:
Safeway Inc.
1121 - 124th Avenue N.E.
Bellevue, WA 98005
Revised July 11 , 2018
November 18, 2013
Our Job No. 16425
CyHAV
m Z 18215 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 FAX
BRANCH OFFICES ♦ TUMWATER,WA • KLAMATH FALLS,OR ♦ LONG BEACH,CA • ROSEVILLE,CA • SAN DIEGO,CA
°y ? www.barghausen.com
y'
16425.002.doc
r'NG ENG1N��
Site Address:
The project is located at the northeast corner of N 191h Avenue and W Main Street in Bozeman
Montana.
Introduction:
The proposed Safeway Fuel Center#2999 consists of approximately 0.8 acres of land adjacent to
the existing Safeway development. The site is currently a casino with driving surfaces, parking
areas and landscaping. This site is being redeveloped with a fuel station and retail space with
associated parking and utilities. The proposed project site was designed to meet the City of
Bozeman requirements. The following pages of this report delineate maintenance requirements
for each feature of the storm drainage facilities constructed on site. Each feature delineated in
the appendix of this report should be monitored twice per year at a minimum, and more often if
maintenance requirements appear to indicate further review of each system is required.
Plan Goal:
The specific purpose for the stormwater facility is to minimize pollution that is typically associated
with modern development. In general, pollution from motor vehicles and pollution generated from
erosion. Attached to this narrative is a maintenance manual, which offers guidelines to the owner
for stormwater facility maintenance.
Prevention BMPs:
The catch basins and conveyance pipes within the right-of-way should be inspected and
maintained by the city. The two infiltration basins will be visually inspected for accumulation of
debris and silt and will be maintained as required by this maintenance plan and attachments.
• Maintenance Standards for Drainage Facilities
No. 1 — Ponds
No. 2—Infiltration Facilities
No. 5 —Catch Basins
No. 7 —Energy Dissipaters
No. 10—Conveyance Systems
No. 11 —Grounds
No. 22—Baffle Oil/Water Separator
These standard maintenance requirements were taken from the King County Surface Water
Design Manual, 2005. These shall be replaced with City of Bozeman or State of Montana
standards if they are more stringent.
Treatment BMPs:
A pond has been designed to provide a settling area for sediment. The pond was designed to
provide treatment area based on the design flow rate. The detention pond will detain water and
release at maximum release rates allowed.
The City of Bozeman is to review and approve any changes to this stormwater Maintenance Plan
prior to changes in its implementation. Additionally, any changes in ownership or person of
responsibility are to be reported to the City of Bozeman.
16425.002.doc
Inspection/Maintenance:
Regular inspections of the drainage facilities should be carried out twice per year, in the spring
and fall. One inspection should be during the month of September to identify and correct any
problems prior to the winter season. The responsible party should keep records of these
inspections available for review by the City. Additional inspections may be required after severe
seasonal storms.
Routine maintenance of the site will include mowing, care of landscaping and the removal of trash
and debris from the drainage system. The streets and driveways should be kept clean and in
good repair. Events such as major storms (more than 1 inch of rain in a 24 hour period) or heavy
winds will require immediate inspections for damages.
To ensure proper water quality and treatment, the pond must be properly maintained. Be careful
to avoid introducing landscape fertilizer to receiving waters or groundwater. If pond side slopes
become eroded over 2 inches deep, stabilize by using appropriate erosion control measures
(e.g., rock reinforcement, planting of grass, compaction).
Use photocopies of these pages to check out the problems you should look for during an
inspection. Copies of the included construction plan sheets would be useful during field
inspections to identify areas that need maintenance and to make sure all facilities are inspected.
Add comments in the Inspection Results field and note the actions taken. Keep these check
sheets in your files. The maintenance records must be kept on file to be reviewed by the City of
Bozeman personnel at their discretion.
Person of Responsibility:
TBD
Design Engineer:
Barghausen Consulting Engineers, Inc.
18215-72nd Avenue South
Kent, WA 98032
(425)251-6222
Plan and/or Information Updates:
The City of Bozeman is to review and approve any changes to this stormwater Maintenance Plan
prior to changes in its implementation. Additionally, any changes in ownership or person of
responsibility are to be reported to the City.
16425.002.doc
INSPECTION/MAINTENANCE CHECKLIST
STRUCTURE DATE OF INSPECTION/MAINTENANCE
Results/
Maintenance Date COMMENTS
Infiltration Basin#2 at Inspection
the NW Corner Results
Maintenance
Done
Infiltration Basin#1 Inspection
South of the Building Results
Maintenance
Done
Catch Basins/Pipe Inspection
System Results
Maintenance
Done
Grounds Inspection
Results
Maintenance
Done
Oil/Water Separator Inspection
Results
Maintenance
Done
16425.002.doc
Maintenance Standards for Drainage Facilities
The facility-specific maintenance standards contained in this section are
intended to be conditions for determining if maintenance actions are
required as identified through inspection. They are not intended to be
measures of the facility's required condition at all times between
inspections. In other words, exceeding these conditions at any time
between inspections and/or maintenance does not automatically
constitute a violation of these standards. However, based upon
inspection observations, the inspection and maintenance schedules shall
be adjusted to minimize the length of time that a facility is in a condition
that requires a maintenance action.
KING COUNTY, WASHINGTON, SUR E WATER DESIGN MANUAL,
E Jr off
Air r EN"Mal
MAINTENANCE REQUIREMENTS FOR FLOW
CONTROL, CONVEYANCE, AND WQ FACILITIES
NO. 1 -DETENTION FONDS
Maintenance Defect or Problem Conditions When Maintenance Is Needed Results Expected When
Component
Maintenance Is Performed
General Trash&Debris Any trash and debris which exceed 1 cubic foot Trash and debris cleared from site.
per 1,000 square feet(this is about equal to the
amount of trash it would take to fill up one
standard size office garbage can). In general,
there should be no visual evidence of dumping.
Poisonous Vegetation Any poisonous or nuisance vegetation which may No danger of poisonous vegetation
or Noxious Weeds constitute a hazard to County personnel or the where County personnel or the
public. public might normally be.
Coordination with Seattle-King
County Health Department
Contaminants and Oil,gasoline,or other contaminants of one gallon No contaminants present other than
Pollution or more,or any amount found that could: a surface film. (Coordination with
1)cause damage to plant,animal,or marine life; Seattle/King County Health
2)constitute a fire hazard;or 3)be flushed Department)
downstream during rain storms.
Unmowed if facility is located in private residential area, When mowing is needed,
Grass/Ground Cover mowing is needed when grass exceeds 18 grass/ground cover should be
inches in height, In other areas,the general mowed to 2 inches in height.
policy is to make the pond site match adjacent Mowing of selected higher use areas
ground cover and terrain as long as there is no rather than the entire slope may be
Interference with the function of the facility. acceptable for some situations.
Rodent Holes Any evidence of rodent holes if facility is acting Rodents destroyed and dam or berm
as a dam or berm,or any evidence of water repaired. (Coordination with
piping through dam or berm via rodent holes or Seattle/King County Health
other causes. Department)
Insects When insects such as wasps and hornets Insects destroyed or removed from
interfere with maintenance activities. Mosquito site. Mosquito control: Swallow
complaints accompanied by presence of high nesting boxes or approved larvicide
mosquito larvae concentrations(aquatic phase). applied.
Tree Growth Tree growth threatens integrity of berms acting Trees do not hinder maintenance
as dams,does not allow maintenance access,or activities. Harvested trees should
interferes with maintenance activity(i.e.,slope be recycled into mulch or other
mowing,silt removal,vactoring,or equipment beneficial uses(e.g.,alders for
movements). If trees are a threat to berm firewood).
integrity or not interfering with access,leave
trees alone.
2005 Surface Water Design Manual—Appendix A A-1 1/24/2005
APPENDIX A MAINTENANCE REQL,,AEMENTS FLOW CONTROL,CONVEYANCE,A. WQ FACILITIES
NO. I - DETENTION PONDS
Mainterance Defect or Problem Conditions When Maintenance Is{Needed Results Expected When
Component Maintenance Is Performed
Side Slopes of Pond Erosion Eroded damage over 2 inches deep where cause Slopes should he stabilized by using
of damage is still present or where there is appropriate erosion control
potential for continued erosion. measure(s);e.g.,rock
reinforcement,planting of grass,
Any erosion observed on a compacted berm compaction.
embankment.
If erosion is occurring on compacted
berms a licensed civil engineer
should be consulted to resolve
source of erosion.
Storage Area Sediment Accumulated sediment that exceeds 10%of the Sediment cleaned out to designed
designed pond depth. pond shape and depth;pond
reseeded if necessary to control
erosion.
Liner Damage Liner is visible and has more than three V.-inch Liner repaired or replaced.
(if Applicable) holes in it,
Pond Berms(Dikes) Settlement Any part of berm that has settled 4 inches lower Dike should be built back to the
than the design elevation. Settling can be an design elevation.
indication of more severe problems with the berm
or outlet works. A licensed civil engineer should
be consulted to determine the source of the
settlement.
Emergency Tree Growth Tree growth on emergency spillways create Trees should be removed. If root
Overflow/Spillway blockage problems and may cause failure of the system is small(base less than 4
and Berms over 4 berm due to uncontrolled overtopping. inches)the root system may be left
feet in height. in place. Otherwise the roots should
Tree growth on berms over 4 feet in height may be removed and the berm restored.
lead to piping through the berm which could lead A licensed civil engineer should be
to failure of the berm. consulted for proper berm/spillway
restoration.
Emergency Rods Missing Only one layer of rock exists above native soil in Replace rocks to design standards.
Overflow/Spillway area five square feet or larger,or any exposure
of native soil at the top of out flow path of
spillway. Rip-rap on inside slopes need not be
replaced.
1/24/2005 2005 Surface Water Design Manual—Appendix A
A-2
APPENDIX A MAINTF .-,,NCE REQUIREMENTS FOR FLOW CONTROL NVEYANCE,AND WQ FACILITIES
NO. 2-INFILTRATION FACILITIES
Maintenance Defect or Problern Conditions When Maintenance Is Needed Results Expected
e Maintp Performed
Component
Infiltration Pond Trash&Debris See"Detention Ponds"Table No.1 See"Detention Ponds"Table No.I
General See"Detention Ponds"Table No.
Poisonous Vegetation See"Detention Ponds"Table No.1
or Noxious Weeds
Contaminants and See"Detention Ponds"Table No. 1 See"Detention Ponds"Table No. 1
Pollution
Unmowed See"Detention Ponds"Table No.1 See"Detention Ponds"Table No.1
Grass/Ground Cover
Rodent Holes See"Detention Ponds"Table No.1 See"Detention Ponds"Table No. i
Insects See"Detention Ponds"Table No.1 See"Detention Ponds"Table No.1
Infiltration Pond Erosion See"Detention Ponds"Table No.1 See"Detention Ponds"Table No.1
Side Slopes
Infiltration Pond Tree Growth See"Detention Ponds"Table No.1 See"Detention Ponds"Table No. 1
Emergency
Overflow Spillway
and Berms over 4
feet in height.
Infiltration Pond Rock Missing See"Detention Ponds"Table No.1 See"Detention Ponds"Table No.1
Emergency
Overflow Spillway
Infiltration Facility Sediment A percolation test pit(ponds)or test of facility Sediment is removed and/or facility
Storage Area indicates facility is only working at 90%of its is cleaned so that infiltration system
designed capabilities. if two inches or more works according to design. Ponds
sediment is present,remove. are reseeded if necessary to control
erosion.
Infiltration Facility Sediment and Debris By visual inspection,little or no water flows Replaced gravel in rock filter.
Rock Filters through filter during heavy rain storms.
(if Applicable)
Infiltration Facility Sump Filled with Any sediment and debris filling vault to 10%of Clean out sump to design depth.
Sump Sediment and Debris depth from sump bottom to bottom of outlet pipe
(if Applicable) or obstructing flow into the connector pipe.
Infiltration Facility Filled with Sediment Sediment and debris fill bag more than 1/2 full. Replaced filter bag or redesign
Filter Bags and Debris
(if Applicable)
Infiltration Facility Sediment Remove when B"or more. Sediment cleaned out to designed
Pre settling Ponds pond shape and depth or sediment
is removed from vault. Ponds are
and Vaults reseeded if necessary to control
erosion.
Note: Sediment accumulation of more than 0.25 inches per year may indicate excessive erosion is occurring upstream of the facility or
that conveyance systems are not being properly maintained. The contributing drainage area should be checked for erosion problems or
inadequate maintenance of conveyance systems if excessive sedimentation is noted in an infiltration facility.
Check twice a year during first 2 years of operation,once a year thereafter. Clean manholes/catch basins,repair damaged inlets/outlets,
clean trash racks.
2005 Surface Water Design Manual—Appendix A A-3 I/24/2005
APPENDIX A MAINTENANCE REQ EMENTS FLOW CONTROL,CONVEYANCE,f WQ FACILITIES
NO. 5-CATCH BASINS
Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When
Component Maintenance is performed
General Trash&Debris Trash or debris of more than Y.cubic foot which No Trash or debris located
(Includes Sediment) is located immediately in front of the catch basin immediately in front of catch basin
opening or is blocking capacity of the basin by opening.
more than 10%.
Trash or debris(in the basin)that exceeds 1/3 the No trash or debris in the catch
depth from the bottom of basin to invert the basin.
lowest pipe into or out of the basin.
Trash or debris in any inlet or outlet pipe blocking Inlet and outlet pipes free of trash or
more than of its height. debris.
Dead animals or vegetation that could generate No dead animals or vegetation
odors that could cause complaints or dangerous present within the catch basin.
gases(e.g.,methane).
Deposits of garbage exceeding 1 cubic foot in No condition present which would
volume. attract or support the breeding of
insects or rodents.
Structure Damage to Corner of frame extends more than Y44 inch past Frame is even with curb.
Frame and/or Top curb face into the street(If applicable).
Slab
Top slab has holes larger than 2 square inches Top stab is free of hales and cracks.
or cracks wider than%inch(intent is to make
sure all material is running into basin).
Frame not sitting flush on top slab,i.e., Frame is sitting flush on top slab.
separation of more than%inch of the frame from
the top slab.
Cracks in Basin Cracks wider than''/x inch and longer than 3 feet, Basin replaced or repaired to design
Walls/Bottom any evidence of soil particles entering catch standards.
basin through cracks,or maintenance person
judges that structure is unsound.
Cracks wider than%:inch and longer than 1 foot No cracks more than inch wide at
at the joint of any inlet/outlet pipe or any the joint of inlet/outlet pipe.
evidence of soil particles entering catch basin
through cracks.
Settlement/ Basin has settled more than 1 inch or has rotated Basin replaced or repaired to design
Misalignment more than 2 inches out of alignment, standards.
Fire Hazard Presence of chemicals such as natural gas,oil No flammable chemicals present.
and gasoline.
Vegetation Vegetation growing across and blocking more No vegetation blocking opening to
than 10%of the basin opening. basin.
Vegetation growing in inletioutlet pipe joints that No vegetation or root growth
is more than 6 inches tall and less than 6 inches present.
apart.
Pollution Nonflammable chemicals of more than'/:cubic No pollution present other than
foot per three feet of basin length. surface film.
Catch Basin Cover Cover Not in Place Cover is missing or only partially in place.Any Catch basin cover is closed
open catch basin requires maintenance.
Locking Mechanism Mechanism cannot be opened by on Mechanism opens with proper tools.
Not Working maintenance person with proper tools.Bolts into
frame have less than%:inch of thread.
Cover Difficult to One maintenance person cannot remove lid after Cover can be removed by one
Remove applying 80 tbs.of lift;intent is keep cover from maintenance person.
sealing off access to maintenance.
Ladder Ladder Rungs Unsafe Ladder is unsafe due to missing rungs, Ladder meets design standards and
misalignment,rust,cracks,or sharp edges. allows maintenance person safe
access.
1/24/2005 2005 Surface Water Design Manual—Appendix A
A-6
APPENDIX A MAINT NCE REQUIREMENTS FOR FLOW CONTROL -NVEYANCE,AND WQ FACILITIES
NO. 5--CATCH BASINS
Maintenance Defect or Problem Conditions When Maintenance Is Needed Results Expected When
Component maintenance is performed
Metal Grates Unsafe Grate Grate with opening wider than 7/8 inch. Grate opening meets design
(If Applicable) Opening standards.
Trash and Debris Trash and debris that is blocking more than 20% Grate free of trash and debris.
of grate surface.
Damaged or Missing. Grate missing or broken member(s)of the grate. =inplacemeets design
NO. 6-DEBRIS BARRIERS(E.G.,TRASH RACKS)
Maintenance Defect or Problem Condition When Maintenance Is Needed Results Expected When
Component
Maintenance is Performed.
General Trash and Debris Trash or debris that is plugging more than 20% Barrier clear to receive capacity
of the openings in the barrier. flow.
Metal Damaged/Missing Bars are bent out of shape more than 3 inches. Bars in place with no bends more
Bars. than%inch.
Bars are missing or entire barrier missing. Bars in place according to design.
Bars are loose and rust is causing 50% Repair or replace barrier to design
deterioration to any part of barrier. standards.
NO. 7-ENERGY DISSIPATERS
Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When
Component
Maintenance is Performed.
External
Rock Pad Missing or Moved Only one layer of rock exists above native soil in Replace rocks to design standards.
Rock area five square feet or larger,or any exposure
of native soil
Dispersion Trench Pipe Plugged with Accumulated sediment that exceeds 20%of the Pipe cleaned/flushed so that it
Sediment design depth. matches design.
Not Discharging Visual evidence of water discharging at Trench must be redesigned or
Water Property concentrated points along trench(normal rebuilt to standards.
condition is a"sheet flow"of water along trench).
Intent is to prevent erosion damage.
Perforations Plugged. Over%of perforations in pipe are plugged with Clean or replace perforated pipe.
debris and sediment.
Water Flows Out Top Maintenance person observes water flowing out Facility must be rebuilt or
of"Distributor"Catch during any storm less than the design storm or redesigned to standards.
Basin. its causing or appears likely to cause damage.
Receiving Area Over- Water in receiving area is causing or has No danger of landslides.
Saturated potential of causing landslide problems.
Internal:
Manhole/Chamber Worn or Damaged Structure dissipating flow deteriorates to`/2 or Replace structure to design
Post.Baffles,Side of original size or any concentrated wom spot standards.
Chamber exceeding one square foot which would make
structure unsound.
2005 Surface Water Design Manual—Appendix A A-7 1/24/2005
APPENDIX A MAINT. NCE REQUIREMENTS FOR FLOW CONTROL NVEYANCE,AND WQ FACILITIES
NO. 10-CONVEYANCE PIPES AND DITCHES
Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When
Maintenance is Performed
Component _ _ -
Pipes Sediment&Debris Accumulated sediment that exceeds 20%of the Pipe cleaned of all sediment and
diameter of the pipe. debris.
Vegetation Vegetation that reduces free movement of water All vegetation removed so water
through pipes. flows freely through pipes.
Damaged Protective coating is damaged;rust is causing Pipe repaired or replaced.
more than 50%deterioration to any part of pipe.
Any dent that decreases the cross section area Pipe repaired or replaced.
of pipe by more than 20%.
Open Ditches Trash&Debris Trash and debris exceeds 1 cubic foot per 1,000 Trash and debris cleared from
square feet of ditch and slopes. ditches.
Sediment Accumulated sediment that exceeds 20%of the Ditch cleaned/flushed of all
design depth. sediment and debris so that it
matches design.
Vegetation Vegetation that reduces free movEofwater ]Water flows freely through ditches.
through ditches.
Erosion Damage to See"Detention Ponds"Table No. "Detention Ponds"Table No. 1
Slopes
Rock Lining Out of Maintenance person can see native soil beneath Replace rocks to design standards.
Place or Missing(If the rock lining.
Applicable).
NO. 11 -GROUNDS (LANDSCAPING)
xpected When
Results Expected When
Maintenance Defect or Problem Conditions When Maintenance is Needed Maintenance is Performed
Component
General Weeds Weeds growing in more than 20%of the Weeds present in less than 5%of
(Nonpoisonous,not landscaped area(trees and shrubs only). the landscaped area.
noxious)
Safety Hazard Any presence of poison ivy or other poisonous No poisonous vegetation present in
vegetation. landscaped area.
Trash or Litter Paper,cans,bottles,totaling more than 1 cubic Area clear of litter.
foot within a landscaped area(trees and shrubs
only)of 1,000 square feet.
Trees and Shrubs Damaged Limbs or parts of trees or shrubs that are split or Trees and shrubs with less than 5%
.broken which affect more than 25%of the total of total foliage with split or broken
foliage of the tree or shrub. limbs.
Trees or shrubs that have been blown down or Tree or shrub in place free of injury.
knocked over.
Trees or shrubs which are not adequately Tree or shrub in place and
supported or are leaning over,causing exposure adequately supported;remove any
of the roots. dead or diseased trees.
I/24/2005
2005 Surface Water Desibm Manual—Appendix A
A-9
APPENDIX A MAINTENANCE.RE( CEMENTS FLOW CONTROL,CONVEYANCE, )WQ FACILITIES
NO. 22- BAFFLE OIL/WATER SEPARATOR
Maintenance Defect Condition When Maintenance is Needed Results Expected When
C01,11pOneilt Maintenance is Performed.
Vault Area Monitoring Inspection of discharge water for obvious signs Effluent discharge from vault should
of poor water quality. be clear with out thick visible sheen.
Sediment Sediment depth in bottom of vault exceeds 6 No sediment deposits on vault
Accumulation inches in depth. bottom which would impede flow
through the vault and separation
efficiency.
Trash and Debris Trash and debris accumulation in vault Trash and debris removed from
Accumulation (floatables and non-floatables), vault,and inlet/outlet piping.
Oil Accumulation Oil accumulations that exceed 9 inch,at the Extract oil from vault by vactoring.
surface of the water Disposal in accordance with state
and local rules and regulations.
Vault Structure Damage to Wall, Cracks wider than V2-inch or evidence of soil Vault replaced or repaired to design
Frame, Bottom, particles entering the structure through the specifications.
and/or Top Slab cracks,or maintenance/inspection personnel
determines that the vault is not structurally
sound.
Damaged Pipe Joints Cracks wider than%2-inch at the joint of any No cracks more than%-inch wide at
inlet/outlet pipe or any evidence of soil particles the joint of the inlet/outlet pipe.
entering the vault through the walls.
Baffles Damaged Baffles corroding,cracking,warping and/or Repair or replace baffles to
showing signs of failure as determined by specifications.
maintenance/inspection person.
Inlet/Outlet Pipes Trash and Debris Trash and debris accumulation in inlettoutlet Trash and debris removed from
Accumulation (floatables and non-floatables), vault,and inlet/outlet piping.
Damaged Pipes Inlet or outlet piping damaged or broken and in Pipe repaired or replaced.
need of repair.
Access Cover Damaged/Not Cover cannot be opened. Corrosion/deformation Cover repaired to proper working
Working of cover, specifications or replaced.
Access Ladder Damaged Ladder is corroded or deteriorated,not Ladder replaced or repaired and
functioning properly,missing rungs,cracks,and meets specifications,and is safe to
misaligned. use as determined by inspection
personnel.
I/24/2005 2005 Surface Water Design Manual—Appendix A
A-I 8
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