Technical Equiv Rpt - Streamguard Catch Basin Inserts
TECHNICAL
EQUIVALENCY REPORT
STREAMGUARD~ CATCH BASIN
INSERTS
FOR
The project of 152nd Street East, 94th Avenue
East and 160th Street East Public Road
Improvements for
`Kensington Estates'
Pierce County, Washington
April, 2000
Prepared for:
Don Huber
Pacific NW Home Construction, LLC
P.O. Box 64160
Tacoma, WA 98464
Prepared by:
Craig A. Deaver, Principal
Project #98119.10
TABLE OF CONTENTS
PAGE
StreamGuard® Catch Basin Inserts ...............................................................................1
Attachment A Product Specifications
Attachment B Product Comparison
Attachment C Pierce County Section 7.7.4.2 Limitations
Attachment D Pierce County Stormwater Treatment Information
Attachment E Bio-swale Maintenance Program
Attachment F Pierce Cotmty Section 7.7.4.2 Limitations
StreamGuard® Catch Basin Inserts
This report accompanies the storm drainage report, and the road, erosion control,
and striping plans for the proposed 152nd Street East, 160 Street East and 94`~
Avenue East Public Road projects as submitted to Pierce County Planning and
Land Services (PALS) and Pierce County Traffic Division. This report is being
submitted for review and approval for technical equivalency for a StreamGuard®
#3001 catch basin insert for water quality treatment in accordance with the Pierce
County Surface Water Management Manual.
It is proposed that all new catch basins as a part of the offsite road improvements
for Kensington Estates shall be installed with StreamGuard® #3001 catch basin
inserts for water quality treatment. The StreamGuard® filter can treat up to
1.lOcfs with a 93% removal of oil and grease. In addition to the removal of grease
and oil, the filter will remove 80% of sediment. (See Attachment A for product
specifications.) The proposed catch basin insert has a bypass for flows over
1. l Ocfs, however the flow rate for the developed 100-year 24-hour storm has been
calculated to be 0.68cfs for the worst-case basin located at 160` Street East entire
road basin. All other 100-year peak flows for the other road improvements areas
have been calculated to be significantly less. As proposed, each roadway catch
basin will be expected to handle flows up to .15 cfs. The catch basin inserts must
be maintained every 6 months to assure maximum oil, grease and sediment
removal (See Attachment A for maintenance information.). The 100-year, 24-hour
storni type lA event was used in considering StreamGuard® catch basin inserts
and their conveyance capacity.
In order to show that the StreamGuard® model #3001 catch basin insert is
technically equivalent to a Pierce County approved water quality device, the
inserts were compared to approved water quality systems. A bioswale, which is
accepted by Pierce County, will remove typically 60% to 70% of sediments (See
Attachment B for Comparison Table). The catch basin inserts will remove 80% of
sediment. The bioswale as a general rule will remove approximately 80% of oils.
Based on the study provided the removal of grease and oils was 93% for the catch
basin insert. It should be pointed out that the bioswale does not provide nutrient
control as stated on page III-6-4 of the Department of Ecology Storm Water
Management Manual "A biofiltration swale is designed to provide runoff
treatment of conventional pollutants but not nutrients." The proposed insert also
does not provide nutrient control. Underground wet vaults and tanks are an
acceptable form of water quality treatment in Pierce County and do not provide
nutrient control as shown on page 7-12 of the Pierce County Storrn Water
Management Manual (See Attachment C for Limitations.). It is important to note
that Pierce County already accepts a form of catch basin inserts for sediment
removal (See Attachment D for Stormwater Treatment information.). It has been
shown that the proposed StreamGuard® #3001 catch basin insert will meet or
exceed the sediment and contaminant removal of approved water quality devices
as approved in the Pierce County Storm Water Management Manual.
2
It is important to address and compare the maintenance of the proposed
StreamGuard® #3001 catch basin insert with the other Pierce County approved
storm water treatment devices. As previously stated, the catch basin insert should
be maintained every 6 months as outline in Attachment `A'. However, the catch
basin inserts should be inspected every month especially after high rainfall
periods for sediment build up. Since the flow contributing to each catch basin is
expected to be .15 cfs. or less, it is unlikely that the inserts will need to be
removed and replace more than every 6 months. The approximated cost to
maintain the proposed catch basin inserts on yearly basis is $2,000.00. In
comparison, a biofiltration swale must be maintained regularly to maintain
appropriate grass height and to remove sediment and debris. Mowing of the Swale
must be completed twice a month during the months of April through October in
order to maintain appropriate grass height. In addition, a bioswale must be
removed of sediment and debris after storm events with rainfall of 1" or greater.
(See Attachment `E' for Maintenance Program.) The annual maintenance cost of a
biofiltration swale is expected to be approximately $1,000.00. Another approved
treatment device, the underground wet tank, must be maintained on a monthly
basis. As stated by the Pierce County Manual "Being underground, vaults and
tanks are more difficult to inspect and maintain." (See Attachment F for
Limitations.) Therefore, the annual cost to maintain vaults will far exceed the cost
to maintain a bioswale or the proposed catch basin inserts. Finally, the catch basin
inserts for sediment control, as approved by Pierce County, must also be
3
maintained on a regular basis and removed of sediment when the unit has
accumulated approximately 12" of sediment.
It is important to discuss the disposal of the catch basin insert debris and material.
Sediment and minor oil drippings from automobiles is the expected to enter the
catch basin insert. In telephone conversations with the manufacturer of the
StreamGuard® catch basin insert it is recommended that the insert be disposed of
in accordance with local jurisdictional requirements. Since the Pierce County
Public Works Department does not have a method or recommendation for
disposal of the catch basin inserts, the Tacoma-Pierce County Health Department
was contacted (253-798-3512) to establish a method for disposal. The Tacoma-
Pierce County Health Department requires that the sediment and heavy metals be
disposed of at an approved location such as Fife Sand and Gravel (253-922-7710)
or TPS Technologies (253-584-8430). After the debris is removed from the catch
basin insert, the fabric that makes up the insert maybe disposed of at an approved
landfill location. After providing anticipated oil saturation levels from the catch
basin insert test data to the health department, it was determined that the inserts
may be disposed of at an approved landfill as determined by the health
department. Pierce County shall coordinate with the Tacoma-Pierce County
Health Department in determining the appropriate landfill. In cases where
obvious oil saturation levels exceed what is normally anticipated, the health
department shall be contacted for a disposal location (253-798-3512) or
Hazardous Waste Line (800) 287-6429. Some examples where oil levels may
exceed the norm are direct dumping of oil from an automotive oil change into the
4
catch basin, an automobile accident where oil, gasoline or antifreeze is spilled into
the catch basin. ' Normal use is expected to be daily pedestrian and vehicular
traffic on the roadway.
In conclusion, the StreamGuard® #3001 catch basin insert, in our opinion, has
been shown to meet or exceed sediment and contaminate removal of approved
Pierce County water quality devices. In addition, maintenance costs and intervals
have also been shown to meet or exceed the cost and intervals of bioswales and
wet tanks. It is important to reiterate that the contributing flows to each filter are
expected to be minimal (.10). The StreamGuard® #3001 catch basin insert has
been shown to be technically equivalent to other approved devices shown in the
Pierce County Storm Water Management Manual.
C.E.S. NW, INC.
Craig A. Deaver
Principal
5
ATTACHMENT A
Rpr 18 00 02:22p Foss Environmen
TM
NONPOINT SOURCE POLLUTION CONTROL PRODUCTS
The StteamG uard line of products incorporates innovative designs and new technologies to provide efficient, cost effective solutions. Exten-
sively tested and engineered, each device is designed to remove pollutants From contaminated water.
StreamGuard Oil & Grease Catch Basin Insert (#~ool 1113ox> (~~021 to-pack)
NOW WITH NEW NON-LEACHING CO-POLYMER ABSORBENT!
This oil-only model is equipped with an oil absorbent polymer. Unlike common
adsorbents. the oleoQhilic StreamGtlardT'" polymer media will not deteriorate or release
absorbed hydrocarbons. As contaminated water flows through the insert, the gcotextile
fabric absorbs oil and retains sediment. Once contaminants have accumulated, the body of
the unit fills with contaminated water and sediment is collected in the bottom of the insert.
Floating oi[ and grease are absorbed by the StreamGuard Co-Polymer contained in a
screen bag fixed within the unit. Great for parking lots and vehicle storage areas. FITS
ANY SIZE CATCH BASIN UP TO 30" x 40"! 1/pack 2.61bs. NOTE: Reuse of the oil unit
is not recommended due to the potential for release of captured oil that is absorbed in the insert fabric. If
hartrrlotrs materials are be present in the stormwater, disposal of the inserts should be in accordance with
local environmental regulations.
INSTALLATION:
1) Remove catch basin grating
2) Clean dirt and debris from
grating led;e.
3) Lay StreamGuard insert over
the catch basin opening with
the bag side of [he insert inside
the basin.
4) Replace the ~atinb, pinchinb
the insert fabric between the
grating and the catch basin.
5) Cut the excess fabric off with
a blade knife. A 3 to five inch
wide strip of fabric should be
left around the outside of the
grating if insert is to be reused.
MAINTENANCE:
The StreamGuard"`' inserts for oil are
designed to operate for up to 3 to 6
months under normal conditions. Where
heavy oil and/or sediment contamination
are present the unit will have a reduced
life expectancy. The accumulation of
sediment can be determined by probing
with a yard stick. When the unit has
collected about 6 inches of sediment it is
recommended that it be replaced. The
unit should also be replaced if free oil can
be seen floating on the water in the bag. It
is recommended that the inserts be
regularly inspected and observations
logged as a best mana;ement practice.
Log sheet is included with each unit.
Adaptor skirt
(for a pcrfcd Retrieval strap
fit)
~" 36"
<. ~>,• ~
e ~~
Underflow ~,:
~: ~ Overflow
discharge ~ (to bypass
Geotextilc
peak storm 24"
fabric -'-' ~ volumes)
_a
..-
Oil absorbent ~--~ Sediment accumulation
co-polymer
PRUDUC.T SPECINICATIUNS
[888)234-3677 p•1
Line An O 19Jr Foss 5nrionmawW. All Rigbls Reserved.
Fabric Property Test Metbod Unit value
Fabric Wei;ht ASTM D-5261 ozlydr 8.0
Thickness ASTM D-5199 mils 145
Water Flow Rate ASTM D-4491 gpm/ft'- 120*
Total Surface Area by measurement square feet 18
Permeability ASTM D-4491 cm/sec .5
U.V. Resistance ASTM D-4355 % 70
• The total water flow rate Ihroush the insert in new condition is in excess of500 eom. The overflow rate
is approximately 250 gym. rr,e $lreamCnrrd msd: Ana b an: o or
~ a I~+r
Foe Emnonnranut Services. All righrt nserved.
Rpr 18 00 02:22p Foss Environmen (8881234-367? P•2
RUBBERIZFR® is the polymer absorbent referred to in this report as "StreamGuardTM" and
used in StreamGuard catch basin Inserts, Passive Skimmers, and Detectors. StreamGuardTM is
a registered trademark of Foss Environmental Services.
StreamGuardTM Polymer Leach Test
per King County !_each Test Protocol
OIL LEACHATE TEST FOR StreamGuardTM
CO-POLYMER ABSORBENT MEDIA
Performed by:
Foss Environmental Services
Introduction
Various absorption and a~sorptian media are available on the market today for the
contact removal of hydrocarbons from storm water. Many of these materials can
subsequently degrade and release hydrocarbons after capture because they do not
provide permanent encapsulation. Foss Enviranmental Services has introduced a
true hydrocarbon absorbent which will not deteriorate with long-term exposure to oil-
contaminated water and will not release captured oil. The absorbent polymer is
used in the StreamGuard"" catch basin insert and Passive Skimmer for removing
oil from storm water.
To demonstrate this products' hydrocarbon non-releasing ability, leach tests were
performed using a test method developed by King County Surface Water
Management Division of Seattle, Washington (see attached test method}.
Leach Test Method
The method basically consists of saturating the media in a hydrocarbon mixture of
50% diesel and 50% used motor oil for approximately 20 hours. Then clean water is
passed through the media at about.'/2gallon-per-minute (gpm} flow rate with five
discrete samples for oil & grease collected at two-minute intervals. A media will
pass this test if the leachate water samples contain less than 1D mg/L oil & grease.
The'/z gpm water flow used to produce the leachate samples was generated with a
small submersible pump in a 5-gallon water reservoir. The flow was moderated with
a PVC ball valve attached to the discharge tubing of the pump and the flow was
calibrated by observing the time required to fill a'/rgallon volume.
Results
The leach test was performed on a sample of the StreamGuardTM' particulate co-
polymer.
The results of the testing are recorded in the following table.
ATTACHMENT B
Apr 18 00 02:22p Fass Environmen (888]234-3677 p•3
FOSS ENYIRONIRfNTAI
STREAMGUARDTM CATCH $ASIN INSERT
PERFORMANCE DATA
As Reported by Port of Seattle -Health, Safety, & Environmental Services
Seattle, Washiington March 1998
In an effort to reduce the amount of oil, grease, and sediment in storm water runoff, the Port of Seattle installed
Foss' StreamGuard Oil & Grease Catch Basin Inserts in several storm drains located in the passenger pickup
azea at Seattlerl'acoma International Airport. An average of 50 Taxis per day park on the two acre paved area
that drains into the catch basins monitored. Since early 1996 the Port has been sampling the treated water at a
point downstream of the catch basins. Use of the StreamGuazd lnserts resulted in a 93% reduction of oil and
grease and an 80% reduction in total suspended solids (TSS) in stormwater runoff.
StreamGuard Insert Performance Data
140
2
1
0 -
t~
~
~ .. _
,.
a~
E ~
4
0
20
D
Before
StreamGuard
Treatment
Contaminant Level
®Oil & Grease
^Total Sediment
~~~5tomi=:t)ate`
~, -~ ~L~ast ;~A~ain"tenanttE~~' s~F
~~1~&f~ea ~T.4~a"~etiimetit, - ~A+CoEnmerit~-a-.
."~::;:;
:
.
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...~. k:y
-
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_
~~ aced~:,~r '_ v'gR.~ it ~ .nc'_
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:ku~.?n~' ~~;
:=;~=; IUf :~ . ~~.'~rs it r :n. T,
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a ....:
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..... _,
:
ar.: n_;, u.:...y +:+:
-- : _
,.
T=5:'; is :°:p _~•:
03/22/96 3!11!96 11 3.9 3 new bags installed
04/16/96 3111/96 36 3.7 30 3 new bags installed
04/22/96 4/18/96 4 2 23 2 new bags installed
07/03/96 4118/96 76 1.4 28 2 new bags installed
07!17/96 4/18/96 90 1.9 13 2 new bags installed
08!02!96 4118/96 106 1.6 33 2 new bags installed
10!04/96 9/3!96 31 1.4 17 4 new bags installed
02111!97 12/18/96 55 5.1 29 4 new bags installed
03!05/97 2!15!97 18 18* 188* 4 new bags installed
Mean 51.1 Z.6 24.7
sd 37.1 1.4 7.4
CV, % 73°!0 54% 30%
* excluded because of potential laboratory error
FOSS ENVIRONMENTAd.
(800)909-3677 fax: (888)2343677 a-atal: tossenv®fosse~-v.com
PO Box 80327 Seattle, WA 98108
www.fosscatalog.com
Rpr 18 00 02:23p Foss Environmen (8881234-3677 P•4
The following leach testing was performed in strict accordance with King County Oil Leach Test
Methodology, April 1995. The tests were conducted by John Macpherson of Foss Envirotmental
Services and supervised by Amy Grey -laboratory managec for Columbia Analytical Services {206)
486-6691 of Bothell, Washington.
Parameter StreamGuardTM Polymer
Date of Test 10/24/97
Weight of media 421 gms
Volume of media 1 liter
Volume of oil used 300 mL
Volume of oil retained in media 244 mL
Oil/media ratio 1.10 mL/gm
Observation while adding the oil Oil flowed tluouglr media at a moderate rate but
absorbed rapidly. Oil dripped into receiver in 68
mixture seconds.
Sample 1 FES-A1
Water flow rate O.S gpm tttru the media. No reduction No oil sheen observed on leachate sample.
of flow due to reduced media transmissivity observed Leachate clear and colorless.
tluoughout the entire test with both media types. Both
Leachate oil = <1.0 mg/1
media could }rave supported higher flow rates
Sample 2 Fl?s-Az
Water flow rate 0,5 gpm thru the media. No reduction No oil sheen observed on leachate sample.
of flow due to reduced media ttanstnissivity observed Leachate clear and colorless.
tltroughaut the entire test with both media types. Botit
Leachate oil = <1.0 tng/1
media could have supported higher flow rates
Sample ~ FES-A3
Water flow rate 0.5 gpm thru the media. No reduction No oil sheen observed on leachate sample.
Leachate clear and colorless.
of flow due fo reduced media trutsmissivity observed
tlvougltout the ontire test with both media types. Bot}t
Leachate oil =1.0 mE/1
media could have supported higher flow rates
Sample 4 FE5-Aa
No oil sheen observed on leachate sample.
Water flow rate 0. S gpm tltru the media. No reduction Leacltate clear and colorless.
of flow due to reduced media transmissivity observed
titrougltout the entire test with both media types. Butlt
Leachate oil = 1.2 mg/L
media could have supported higher flow rates
Sample 5 FES-AS
Water flow rate 0.5 bpm thru the media. No reduction No oil sheen observed on leachate sample.
Leacltate clear and colorless.
of flow due to reduced media transmissivity observed
throughout the entire test with both media types. Both Lrtchate uii = <t.0 mgll
media could have supported higher flow rates
All aspects of the leach test methodology were performed by Jolut Macpherson (professional analytical
cltetnisi) for Foss Environmental Services of Seattle, Washington. 1 hereby attest that the test procedures
performed by me were done so in strict accordance with the attached King County Oil Leach Test method.
Oil & Grease Insert MSDS Yage 1 of 2
~~ss Material Safety Data Sheet
Product NameIFOSS ID#: StreamGuard Catch Basin Insert for Oil & Grease #3001
Product Description: Polypropylene
I. Manufacturer Identification
Manufacturer's Name: Foss Environmental
Address: 200 SW Michigan Street Seattle,
WA 98106
Emergency Telephone: (800) 909-3677
Telephone Number For Information: (800)
909-3677
II. Hazardous Ingredients/identity
Information
Hazardous Components(Specific Chemical
Identity: Common Name(s)):
N/A -There are no chemicals present in this
product at a concentration of 0.1 % or greater
c/ass~ed as a carcinogen by IARC, NTP, or
OSHA. This product is not considered a
hazardous substance by the EPA.
OSHA PEL:
ACG1H TLV:
Other Limits Recommended:
VI. Health Hazard Data
Route(s) of Entry: Inhalation? Primary
Skin? NIA
Ingestion? Possible
Health Hazards (Acute and Chronic) :None
that are known
Carcinogenicity: No NTP? No
IARC? No
OSHA? No
Signs and Symptoms of Exposure:
Respiratory conditions and eye irritation are
possible and skin irritation as with exposure to
any fine or grainy material.
Medical Conditions Generally Aggravated
by Exposure: respiratory conditions and eye
irritation are possible and skin irritation as with
exposure to any fine or grainy material.
Emergency and First Aid Procedures: Flush
affected areas thoroughly with water and
consult a physician if irritation persists.
III. Physical/Chemical Characteristics
Boiling Point: NIA
Vapor Pressure (mm Hg.) : N/A
Vapor Density (Air = 1) :NIA
Solubility in Water: Insoluble
Specific Gravity (H2 0 = 1) :.89 - 1.1
Melting Point: N/A
Evaporation Rate (Butyl Acetate) : N/A
Appearance and Odor. Dark fabric/white
grainy material; mild, sweet odor
IV. Fire and Explosion Hazard Data
Flash Point (Method Used) : ASTM D 92 3250
F Cleveland open cup
Flammable Limits: Not yet established
LEL: no data UEL: no data
Extinguishing Media: C02 ,Water, foam,
VII. Precautions For Safe Handling and Use
Steps To Be Taken In Case Material Is
Released Or Spilled: If material has not been
contaminated it may be disposed of as a solid
waste. If material is contaminated, dispose of
accordingly.
Waste Disposal Method: Product should be
stored away from excessive heat and/or
ignition source, preferable long term storage
should be below 1250 F
Precautions To Be Taken In Handling and
Storing:
Other Precautions: None
VIII. Control Measures
Respiratory Protection (Specific Type)
None
http://www.fossenv.com/MSDS's/Oil%20&%20Grease%20Insert.htm 04/18/2000
Oil & Grease Insert MSDS
and dry chemical
Special Fire Fighting Procedures: Protect
against inhalation of combustion products.
Unusual Fire and Explosion Hazards: None
known.
V. Reactivity Data
Stability: Unstable: Stable: XX
Conditions to Avoid: Ignition sources,
excessive heat. Do not allow contact with
strong oxidizing agents.
Incompatibility (Materials to Avoid) :Strong
oxidizing agents (i.e., concentrated nitric acid)
Hazardous Decomposition of Byproducts:
Combustion byproducts -hydrocarbons,
aldehydes, carboxylic acid, carbon monoxide
Hazardous Polymerization: Occur:
III Not Occur: X
Conditions To Avoid: Strong Oxidizing
agents (i.e., concentrated nitric acid)
Special: None vy. "..._~..,. vV.~.v~v~"
Mechanical (General) :None
Other: None
Protective Gloves: Optional
Eye Protection: None
Other Protective Clothing or Equipment:
None
Work/Hygienic Practices: None
Page 2 of 2
http://www.fossenv.com/MSDS's/Oil%20&%20Grease%20Insert.htm 04/18/2000
Oil & Grease Insert MSDS
f D~~ Material Safety Data Sheet
Product Name/FOBS ID#: Oil Absorbent, Non-Leaching Foss Polymer/#3001, 3017, 3024
Product Description: For catch basin inserts, skimmer, booms, and pillows
I. Manufacturer Identification
Manufacturer's Name: Haz-Mat Response
Technologies, Inc.
Address: 5841 Box Canyon Road La Jolla, CA
92037
Emergency Telephone: (800) 542-3036
Telephone Number For Information: (800)
542-3036
11. Hazardous Ingredients/Identity Information
Hazardous Components(Specific Chemical
Identity:
Common Name(s)): N/A -There are no
chemicals present in this product at a
concentration of 0.1 % or greater classified as a
carcinogen by IARC, NTP, or OSHA. This
product is not considered a hazardous substance
by the EPA.
OSHA PEL:
ACGIH TLV:
Other Limits Recommended:
III. Physical/Chemical Characteristics
Boiling Point: N/A
Vapor Pressure (mm Hg.) : N/A
Vapor Density (Air = 1) : NlA
Solubility in Water: Insoluble
Specific Gravity (H2 0 = 1) :apparent - 0.40;
real - 0.89
Melting Point: N/A
Evaporation Rate (Butyl Acetate) : N/A
Appearance and Odor. White grainy material;
mild, sweet odor
IV. Fire and Explosion Hazard Data
Flash Point (Method Used) : ASTM D 92 3250
F Cleveland open cup
Flammable Limits: Not yet established
VI. Health Hazard Data
Route(s) of Entry: Inhalation? Primary
Skin? N/A
Ingestion? Possible
Health Hazards (Acr~te and Chronic) :None
that are known
Carcinogenicity: No NTP? No IARC? No
OSHA? No
Signs and Symptoms of Exposure:
Respiratory conditions and eye irritation are
possible and skin irritation as with exposure to
any fine or grainy material.
Medical Conditions Generally Aggravated
by Exposure: respiratory conditions and eye
irritation are possible and skin irritation as
with exposure to any fine or grainy material.
Emergency and First Aid Procedures:
Flush affected areas thoroughly with water
and consult a physician if irritation persists.
VII. Precautions For Safe Handling and
Use
Steps To Be Taken In Case Material Is
Released Or Spilled: If material has not
been contaminated it may be swept up and
returned to its container. If material is
contaminated, dispose of accordingly.
Waste Disposal Method: Incinerate or
landfill according to government waste
disposal regulations (local, state, and federal).
Precautions To Be Taken In Handling and
Storing: Product should be stored away from
excessive heat and/or ignition source,
preferable long term storage should be below
1250 F
Other Precautions: None
VIII. Control Measures
Page 1 of 2
http://www.fossenv.corn/MSDS's/Oil%20&%20Grease%20Insert.htm 04/18/2000
Oil & Grease Insert MSDS
~c~: no oata u~~: no aata
Extinguishing Media: C02 ,Water, foam, and
dry chemical
Special Fire Fighting Procedures: Protect
against inhalation of combustion products.
Unusual Fire and Explosion Hazards: None
known
V. Reactivity Data
Stability: Unstable: Stable: XX
Conditions to Avoid: ignition sources,
excessive heat. Do not allow contact with strong
oxidizing agents.
Incompatibility (Materials to Avoid) :Strong
oxidizing agents (i.e., concentrated nitric acid)
Hazardous Decomposition of Byproducts:
Thermal decombustioNcombustion may release
hydrocarbons, aldehydes, keytones, alcohols,
carboxylic acid, carbon monoxide and
unidentified organic compounds.
Hazardous Polymerization: Occur. Will Not
Occur: X
Conditions To Avoid: Strong Oxidizing agents
(i.e., concentrated nitric acid)
Respiratory Protection (Speck Type)
Dust masks for airborne particles.
Ventilation: Local Exhaust: Sufficient
Special: None
Mechanical (General) :None Other: None
Protective Gloves: Optional
Eye Protection: Goggles for dust protection
Other Protective Clothing or Equipment:
None
Woric/Hygienic Practices: Working
procedures should minimize airborne particles
Foss Environmernal PO Box 80327 Seattle, Washington 98108 USA
tel 800.909.3677 fax 888.234.3677 a-mail fossen~ossenv.com
Page 2 of 2
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ATTACHMENT C
PIERCE COUNTY STORMWATER MANAGEMENT and SITE DEVELOPMENT MANUAL
7.7.4.1 Location and Bypass
If a wet vautt/tank is designed to provide runoff treatment but not runoff quantity control it
must be located "off-line" from the primary conveyance/detention system. Flaws above
the peak flow for the water quality design storm must bypass the facility in a separate
conveyance to the point of discharge. A mechanism must be provided at the bypass
point to take the facility "off-fine" for maintenance purposes.
7.7.4,2 Limitations
Wet vaults/tanks cannot provide the equivalent level of treatment accomplished by wet
ponds and constructed wetlands because neither biological uptake nor vegetative
filtration are available as pollutant removal mechanisms. Gravity-settling of suspended
so i s is a pnmary removal mechanism but vaults/tanks are unlikely to be as effective
as open ponds in removing particulates because tittle or no soil layer exists in which to
permanently stabilize trapped sediments. Also, being underground, vaults and tanks are
more difficult to inspect and maintain. Therefore, they shall only be permitted for use
on sites, with one acre of contributing area or less,,and then only after it has been
demonstrated to the satisfaction of the County that more desirable BMPs are not
practicable.
7.7.4.3 Design Considerations
Wet vaults/tanks shall be a minimum of 20 feet from any structure, property line, and
from any septic tank/drain field. All wet vaults/tanks shall be a minimum of 50 feet from
the top of any steep slope. A geotechnical report must address the potential impact on a
steep slope if it is proposed to be closer.
The design criteria for a wet vau~/tank shall be the same as for Wet Ponds (conventional
pollutants) and as detailed in Section 6.6.17.
The length-to-width ratio at the design surface area shall be no less than 3:1.
Where the wet vault/tank is designed to provide sediment containment, a minimum of 0.5
feet of dead storage depth shall be provided and the vault/tank shall be laid flat or the
wet vault/tank shaft be divided into 2 cells using a baffle, with the first cell, the forebay,
occupying about 25 per cent of the area. The top of the baffle wall must be coincident
with the depth of the permanent pool.
7.8 PRESETTLING BASINS
A presettling basin provides pretreatment of runoff in order to remove suspended solids which
can impact other primary treatment BMPs. A presettling basin has no "permanent pool" volume;
runoff is detained so that particulates can settle out before being discharged to another BMP.
Runoff treated b}~presettling basin must be further treated by a water quality infiltration or
ftltration BMP. such as a wet pond-type BMP or a biofilter prior to discharge to groundwater
~~
7-12
ATTACHMENT E
PIERCE COUNTY STORMWATER MANAGEMENT and SITE DEVELOPMENT MANUAL
or right-of-way in a developed or disturbed area. Its purpose is to intercept sediment-laden
water from disturbed areas, retain sediment, and release water in sheet flow.
8.11.4 Triangular Sediment Filter Dikes
Refer to Appendix C, Detail 14.0 and Appendix G for standard notes regarding this practice.
Triangular sediment filter dikes are temporary barriers constructed of wire mesh and geotextile
fabric, installed along a flat area or across the toe of a slope.
The purpose of a triangular sediment filter dike is to intercept and detain water-home sediment
from unprotected areas of limited extent.
They are to be used where there is no concentration of water in a channel or other drainageway
above the barrier. If a concentrated flow does occur after installation, corrective action must be
taken such as placing rock berms in the areas of concentrated flow.
8.11.5 Inlet Sediment Protection
Refer to Appendix C, Detail 1.0, 2.0 and 3.0 and Appendix G for standard notes regarding this
practice. Standard inlet protection techniques are intended for filtration of small amounts of
sediment. The inlet protection shall be used in conjunction with other upstream erosion and
sedimentation controls. They are not a replacement for upstream controls. The placement of a
length of filter fabric cloth under a catch basin grate as the primary, sole, sediment
control measure is not an acceptable practice.
~ Drop-in catch basin filters may be used in place of other standard inlet protection practices
shown in Details 1.0, 2.0 and 3.0. In contrast to standard practices, this inlet protection
technology can be used in situations where right-of--way flooding would be a problem. To
maintain function, filters shall be removed and cleaned or replaced after each storm event.
Contact the County to determine its acceptance of specific filter products.
8.11.6 Pipe Slope Drains
Refer to Appendix C, Detail 15.0 and Appendix G for standard notes regarding this practice.
The entrance shall consist of a standard flared end section for culverts greater than 12" diameter
with a minimum six-inch metal toe plate to prevent runoff from undercutting the pipe inlet. The
slope of the entrance shall be at least three percent.
8.11.7 Stair Stepping Cut Slopes And Grooving Slopes (Surface Roughening)
Refer to Appendix G for standard notes regarding this practice.
Graded areas with slopes greater than 3:1 but less than 2:1 shall be roughened before seeding.
This can be accomplished in a variety of ways, including "trackwalking", or driving a crawler
tractor up and dawn the slope, leaving a pattern of cleat imprints parallel to slope contours.
Tread imprints trap seeds and encourage plants to become established.
8-14
ATTACHMENT D
Y
Frequenry Drainage Problem Conditions to Chedc For Conditions That Shou{d Exist
System ~
Feature
M Vegetation not and seedy or
Grass cover is sparse Aerate soils and reseed and
growing or .
areas are overgrown with woody mulch bare areas. Maintain
overgrown vegetation. grass height at a minimum of
6 inches for best stomrwater
ant Remove woody
growth, recontour, and reseed
as necessary.
M,S Erosion See Ponds Checklist See Ponds Cheddist
damage to
slopes
M Conversion by .Swale has been filed in or blocked If possble, speak with
homeowner to by shed, woodpile, shrubbery, eta homeowner and n:quest that
incompatible swale area be restored.
use ~ Contact the County to report
problem if not rectified
voluntarily.
A Swale does not Water stands in Swale or flow A survey may be needed to
drain velocity is very slow. Stagnation check grades. Grades need
oaurs. to be in 1-5°~ range if
possb(e. if grade is less than
1% underdrains may need to
be installed.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
~~
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=After major stones (use 1-i^~ in 24 hours as a guideline)
~'^
J-31
ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Conveyance Systems (Pipes, Ditches, and Swales)
Frequenry Drainage Problem Conditions to Check For Conditions That Should Exist
System ~
Feature
M,S Pipes Sediment ~ Accumulated sediment that exceeds Pipe leaned of alt sediment
debris 20% of the diameter of the pipe. and debris.
M Vegetation Vegetation that reduces free All vegetation removed so
movement of water through pipes. water flows freely through
PiP~•
p Damaged Protective coating is damaged; rust Pipe repaired or replaced.
(rusted, bent, is causing more than 50%
or avshed) deterioration to any part of pipe.
M Any dent that significantly impedes Pipe repairnd or replaced.
flow (i.e., decreases the cross
section area of pipe by more than
20%).
M Pipe has major cracks or tears Pipe repaired or replaced.
allowing groundwater leakage.
M
S Open Trash i£ debris Dumping of yard wastes such as Remove trash and debris and
, ditches grass clippings and branches into dispose as prescribed by the
basin. Unsightly accumulation of County.
nondegradable materials such as
glass, plastic, metal, foam, and
coated paper.
M Sediment Accumulated sediment that exceeds Ditch cleaned of all sediment
buildup 20% of the design depth. and debris so that it matches
design.
p Vegetation Vegetation (e.g., weedy shrubs or Water flows freely through
saplings) that reduces free ditches. Grassy vegetation
movements of water through should be left alone.
ditches.
M Erosion See Ponds Checklist. See Ponds Checklist.
damage to
slopes
p Rock lining out Maintenance person can see native Replace rocks to design
of place or soil beneath the rock lining. ' standard.
missing (d
applicable}
Varies Catch See Catch Basins Checkl'~st See Catch Basins Checklist
basins
M,S Swales Trash ~ debris See above for Ditches. See above for Ditches.
M ~ .Sediment See above for Ditches. Vegetation may need to be
buildup replanted after leaning.
-'~
J-30
ATTACHMENT F
PIERCE COUNTY STORMWATER MANAGEMENT and SITE DEVELOPMENT MANUAL ~
7.7.4.1 Location and Bypass
If a wet vauit/tank is designed to provide runoff treatment but not runoff quantrty control it
must be located "off-line" from the primary conveyance/detention system. Flows above
the peak flow for the water quality design storm must bypass the facility in a separate
conveyance to the point of discharge. A mechanism must be provided at the bypass
point to take the facility "off-line" for maintenance purposes.
7.7.4.2 Limitations
Wet vaults/tanks cannot provide the equivalent level of treatment accomplished by wet
ponds and constructed wetlands because neither biological uptake nor vegetative
filtration are available as pollutant removal mechanisms. Gravity-settling of suspended
solids is the primary removal mechanism but vaults/tanks are unlikely to be as effective
as open ponds in removing particulates because f'-ttle or no soil layer exists in which to
permanently stabilize trapped sediments. Also. beino underground, vaults and tanks are
more difficult to inspect and maintain. Therefore, they shall only be permitted for us'e
on sites, with one acre of contributing area or less, and then only after it has been
demonstrated to the satisfaction of the County that more desirable BMPs are not
practicable.
7.7.4.3 Design Considerations
Wet vaults/tanks shall be a minimum of 20 feet from any structure, property line, and ~~
from any septic tank/drain field. All wet vaults/tanks shall be a minimum of 50 feet from
the top of any steep slope. A geotechnical report must address the potential impact on a
steep slope if it is proposed to be closer.
The design criteria for a wet vault/tank shall be the same as for Wet Ponds (conventional
pollutants) and as detailed in Section 6.6.17.
The length-to-width ratio at the design surface area shall be no less than 3:1.
Where the wet vault/tank is designed to provide sediment containment, a minimum of 0.5
feet of dead storage depth shall be provided and the vault/tank shall be laid flat or the
wet vault/tank shall be divided into 2 cells using a baffle, with the first cell, the forebay,
occupying about 25 per cent of the area. The top of the baffle wall must be coincident
with the depth of the permanent pool.
7.8 PRESETTLING BASINS
A presettling basin provides pretreatment of runoff in order to remove suspended solids which
can impact other primary treatment BMPs. A presettling basin has no "permanent pool" volume;
runoff is detained so that particulates can settle out before being discharged to another BMP.
Runoff treated by a presettling basin must be further treated by a water quality infiltration or
filtration BMP such as a wet aond-tvoe BMP or a biofilter prior to discharge to groundwater.
7-12