U.S. patent application number 13/471343 was filed with the patent office on 2013-11-14 for stormwater filtering device for catch basins.
This patent application is currently assigned to UNITED SORBENTS SEATTLE, LLC.. The applicant listed for this patent is Don Rogahn. Invention is credited to Don Rogahn.
Application Number | 20130299402 13/471343 |
Document ID | / |
Family ID | 49547828 |
Filed Date | 2013-11-14 |
United States Patent
Application |
20130299402 |
Kind Code |
A1 |
Rogahn; Don |
November 14, 2013 |
STORMWATER FILTERING DEVICE FOR CATCH BASINS
Abstract
A novel removable catch basin filter assembly configured to fit
within a catch basin of the type that collects stormwater runoff is
disclosed herein. The removable catch basin filter assembly
comprises an outer support frame sized to fit on the upper
perimeter recessed ledge of the catch basin and underneath the
grate, and a filtering system detachably connected to a selectively
sized outer support frame. The filtering system comprises a lower
filter bag made of a water permeable material (e.g., a geotextile)
capable of filtering one or more contaminates contained within
stormwater runoff, four receiving tabs positioned at or near the
four corners of the inner perimeter edge of the upper perimeter
flange of the filtering system, wherein the four receiving tabs are
configured to detachably receive the four corners of the outer
support frame.
Inventors: |
Rogahn; Don; (Chisago,
MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Rogahn; Don |
Chisago |
MN |
US |
|
|
Assignee: |
UNITED SORBENTS SEATTLE,
LLC.
Kent
WA
|
Family ID: |
49547828 |
Appl. No.: |
13/471343 |
Filed: |
May 14, 2012 |
Current U.S.
Class: |
210/163 |
Current CPC
Class: |
E03F 5/0404
20130101 |
Class at
Publication: |
210/163 |
International
Class: |
E03F 1/00 20060101
E03F001/00 |
Claims
1. A removable catch basin filter assembly configured to fit within
a rectangular or square shaped catch basin of the type that
collects stormwater runoff, the catch basin having an upper
perimeter recessed ledge sized to receive and support a grate,
comprising: a rectangular or square shaped outer support frame
sized to fit on the upper perimeter recessed ledge of the catch
basin and underneath the grate; a flexible material that defines a
flanged bowl detachably connected to the outer support frame, the
flexible material comprising an upper perimeter flange attached to
a lower filter bag and defining an inner perimeter edge having four
corners, the upper perimeter flange being attached to the lower
filter bag along the inner perimeter edge to thereby define the
flanged bowl, the lower filter bag being sized and configured to
fit within the catch basin, the lower filter bag being made of a
water permeable material capable of filtering one or more
contaminates contained within stormwater runoff that collects
within and permeates through the lower filter bag; at least four
receiving tabs positioned at or near the four corners of the inner
perimeter edge of the upper perimeter flange, the at least four
receiving tabs being configured to detachably receive the four
corners of the outer support frame; and one or more lifting straps
attached at or near the four receiving tabs.
2. The removable catch basin filter assembly of claim 1 wherein the
lifting straps crisscross each other.
3. The removable catch basin filter assembly of claim 1 wherein the
water permeable material is a fabric.
4. The removable catch basin filter assembly of claim 1, further
comprising a filtering media contained within the lower filter bag
for filtering oils, metals, or both from stormwater.
5. The removable catch basin filter assembly of claim 4 wherein the
filtering media is an ion exchange resin.
6. The removable catch basin filter assembly of claim 1 wherein the
rectangular or square shaped outer support frame is in the form of
first and second pieces of metal wire fastened together.
7. The removable catch basin filter assembly of claim 1, further
comprising one or more spillways located one a sidewall of the
lower filter bag.
8. A removable catch basin filter assembly configured to fit within
a catch basin of the type that collects stormwater runoff, the
catch basin having a catch basin opening surrounded by an upper
perimeter recessed ledge sized to receive and support a grate,
comprising: a support means for supporting a lower filter bag
within the catch basin, the support means being sized to fit on the
upper perimeter recessed ledge of the catch basin and underneath
the grate; a filtering system means detachably connected to the
support means, the filtering system means comprising an upper
perimeter flange attached to a lower filter bag, the upper
perimeter flange defining an inner bag opening and an inner
perimeter edge, the upper perimeter flange being attached to the
lower filter bag along the inner perimeter edge to thereby define
the inner bag opening, the lower filter bag being sized and
configured to fit within the catch basin, the lower filter bag
being made of a water permeable material capable of filtering one
or more contaminates contained within stormwater runoff that
collects within and permeates through the lower filter bag; a
receiving means positioned at or near the inner perimeter edge of
the upper perimeter flange, the receiving means being configured to
detachably receive the support means; and a means for lifting the
removable catch basin filter assembly into and out of the catch
basin.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of priority to U.S.
Provisional Application No. 61/557,307 filed on Nov. 8, 2011, and
U.S. Provisional Application No. 61/593,125 filed on Jan. 31, 2012,
all of which applications are incorporated herein by reference in
their entireties for all purposes.
TECHNICAL FIELD
[0002] The present invention relates generally to stormwater
management devices and, more particularly, to stormwater filtering
devices.
BACKGROUND OF THE INVENTION
[0003] The decontamination of stormwater runoff from various
commercial and industrial sites is an important element in our
Nation's ongoing efforts to prevent pollution from reaching our
lakes and streams. Many commercial and industrial sites use various
decontamination filtration systems within their stormwater catch
basins. However, certain aspects associated with current designs
hinder their effectiveness. Thus, there is a need in the art for
new and improved stormwater filtration and decontamination
systems.
[0004] The government takes an active interest in cleaning up and
preventing the pollution of our waters. For example, the
Comprehensive Environmental Response, Compensation and Liability
Act passed in 1980, and later modified in 1986, created a law
(found in the United States Code beginning at Section 9601 of Title
42) with which a special tax was thereafter imposed. The funds from
this tax are now collected by a Trust Fund (commonly known as the
"Superfund") and are used to carry out a massive cleanup effort,
led by the United States Environmental Protection Agency (EPA).
[0005] Recently, the EPA has been particularly interested in the
prevention of oily and metallic contaminants in stormwater drainage
from exiting the premises of certain governmental, industrial and
commercial sites that are in close geographic proximity to
high-risk waterways, including streams, rivers, freshwater lakes
and ponds, as well as saltwater shorelines. The owners of these
sites may be held responsible for all water drainage from their
facility's grounds, including stormwater runoff that may
incidentally be exposed to petroleum-based and/or metallic
contaminants.
[0006] Exemplary stormwater filtering devices known in the art
include: U.S. Pat. No. 4,419,232 to Arntyr discloses a two stage
filtering device for use in water drains and is intended to
separate and collect particulate impurities from liquid passing
into the drain. The first stage of the device includes a holder
ring that is mounted under the drain grating and a basket sitting
inside it, which acts as a coarse filter of larger particulates.
The draining liquid then passes into the second stage, which is a
cone shaped fabric filter that hangs below the ring and provides
filtering of finer matter.
[0007] U.S. Pat. No. 5,372,714 to Logue discloses a removable
filter for buried catch basins. The filter includes a bag located
within the catch basin and looped flaps which extend above ground
level to aid in removal of the filter. The device is held in place
by the heavy drain grate covering the basin. The filter is removed
from the catch basin by inserting a lifting rod in each flap loop
and hooking lift chains to the rods at the openings of the loops.
With no frame or support structure and the grate as the only thing
holding the filter in place, it is very easy for this device to
fall into the drain when the filter needs to be inspected or
changed.
[0008] U.S. Pat. No. 6,045,691 to McDermott discloses an apparatus
for initial treatment of stormwater in catch basins. The device
includes a frame that sits on the lip of the catch basin and has a
plurality of troughs that support an absorbent sock and
semi-permeable filtering bag, all of which sit at the periphery of
the catch basin. The troughs are intended to direct the water into
the semi-permeable bags. A disadvantage of this design is that
because all filtering takes place at the periphery of the catch
basin, in high flow settings such as a storm, the excess water will
be too much for the troughs to direct and will flow directly down
the drain.
[0009] U.S. Pat. No. 6,059,964 to Strawser discloses a storm water
filtering assembly that sits on top of the catch basin and when
raised with the manually pilotable support leg, forms a mesh fence
around the drain. Because this device surrounds the drain and is
above ground, it creates a sizeable obstacle over the drain and
cannot be used in roadways or anywhere this could be a problem.
[0010] U.S. Pat. No. 6,086,758 to Schilling discloses a filtering
system comprising a frame positioned underneath the drain grate, a
fabric filter which hangs from hooks on the frame, and a basket
that also connects to the frame via the hooks. The basket is
intended to withstand the pressures exerted by waste and water
collected within the filter. The filter additionally has overflow
outlets to prevent a backup of stormwater during periods of heavy
rain. A problem with this device is that there is no way to easily
remove or change the filter since it is hung beneath ground level
and no handles or method is provided for lifting the filter out of
the catch basin.
[0011] U.S. Pat. No. 6,217,757 to Fleishmann discloses a tubular
cartridge style storm drain filter. The cartridge is supported
within the catch basin by a flange around its top edge and sits
within the catch basin. The cartridge includes a series of vertical
mesh cylinders with filtering media enclosed between the screens.
As water passes from the outermost layer to the central drainage
outlet it is sequentially filtered of particulate matter. A handle
on the cartridge is used to lift or lower the entire filter into
the drain. The complexity of this device makes it less desirable
for some consumers.
[0012] U.S. Pat. No. 6,294,095 to Lewis discloses a silt filtration
system for use in stormwater catch basins and includes a fixed
frame at the top of the catch basin with a grate covering the drain
opening, a second base frame that sits within the fixed frame and
has ridges to secure rails in place paralleling the edges of the
frames. The rails slide into a filter bag, which hangs into the
catch basin and filters particulate matter from the stormwater. A
drawback of this design is that the rail system used to hold the
filter bag in place is susceptible to slipping out of the groves in
the frame intended to hold it in place, causing the filter and its
contents to be dumped down the drain.
[0013] U.S. Pat. No. 6,805,804 to Page discloses a stormwater catch
basin insert that is assembled from a single roll of filtering
material and cut to the desired size, and then tied off at the
bottom. The resulting filter bag might be a quick fix in a pinch,
but is prone to having the bottom tie come undone spilling filtered
contents into the drain.
[0014] U.S. Pat. No. 7,201,843 to Sasaki discloses a storm drain
sediment filter with a wire frame that sits in just beneath the
metal storm grate. The frame is adjustable via overlapping portions
that allow the outer dimension of the frame to fit within various
catch basin openings. This steel wire frame is inserted into sewn
loops on a filter bag that hangs from the frame down into the catch
basin. The relatively narrow size of the cone shape fabric filter
can cause issues with overflow during periods of high water flow,
and because there are no handles or way to pull the filter out of
the drain, technicians tend to have a hard time changing or viewing
this filter system.
[0015] U.S. Pat. No. 7,404,892 to Shaw discloses a combination
filtration and antimicrobial catch basin filter that is in the form
of a fabric filtration bag sitting beneath a storm grate. The
filtration bag has a plurality of anti-microbial strips hanging
from the bottom of the filter bag. The strips are intended to
reduce the concentration of bacteria in the catch basin sump. This
device lacks a frame or support structure to keep the filtration
bag from falling into the drain, and additionally lacks a means of
lifting the bag from the basin if maintenance is necessary.
[0016] Because each of these known devices has one or more
shortcomings (especially in terms of providing a physical restraint
while the dog waits for commands), there is still a need in the art
for new and improved dog training devices. The present invention
fulfills this need and provides for further related advantages.
SUMMARY OF THE INVENTION
[0017] The present invention is directed to a removable catch basin
filter assembly preferably configured to fit within a rectangular
or square shaped (and sometimes a round) catch basin of the type
that collects stormwater runoff (namely, a catch basin having a
catch basin opening surrounded by an upper perimeter recessed ledge
sized to receive and support a grate). The removable catch basin
filter assembly of the present invention comprises: a rectangular
or square shaped outer support frame sized to fit on the upper
perimeter recessed ledge of the catch basin and underneath the
grate; a flexible material (e.g., a geotextile material) detachably
connected to the outer support frame, the flexible material
comprising an upper perimeter flange attached to a lower filter
bag, the upper perimeter flange defining an inner bag opening and
an inner perimeter edge having four corners, the upper perimeter
flange being attached to the lower filter bag along the inner
perimeter edge to thereby define the inner bag opening, the lower
filter bag being sized and configured to fit within the catch
basin, the lower filter bag being made of a water permeable
material capable of filtering one or more contaminates contained
within stormwater runoff that collects within and permeates through
the lower filter bag; four receiving tabs positioned at or near the
four corners of the inner perimeter edge of the upper perimeter
flange, the four receiving tabs being configured to detachably
receive the four corners of the outer support frame; and a pair of
lifting straps attached at or near the four receiving tabs.
[0018] These and other aspects of the present invention will become
more readily apparent to those possessing ordinary skill in the art
when reference is made to the accompanying drawings in conjunction
with the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings are intended to be illustrative of certain
preferred embodiments of the present invention. Like reference
numerals have been used to designate like features throughout the
several views of the drawings.
[0020] FIG. 1 is a perspective view of a removable catch basin
filter assembly in accordance with the present invention, wherein
one of the two lifting straps is shown in a partial view to better
illustrate how the detachable outer frame member is detachably
connectable/connected into each of the four receiving tabs
positioned at the four corners of the inner perimeter edge of the
upper perimeter flange associated with the flexible material, and
wherein each of the corners includes a series of three tabs aligned
in a row.
[0021] FIG. 2 is a perspective view of the removable catch basin
filter assembly shown in FIG. 1, but wherein the detachable outer
frame member is detachably connected into each of the four
receiving tabs.
[0022] FIG. 3 is a perspective view of a removable catch basin
filter assembly in accordance with another embodiment of the
present invention, wherein the lower filter bag portion further
comprises a filtering media for enhanced filtering of oils, metals,
or both from stormwater.
[0023] FIG. 4 is a perspective view of the removable catch basin
filter assembly shown in FIG. 3, but wherein the filter assembly is
positioned within a catch basin.
[0024] FIG. 5 is a top plan view of a removable catch basin filter
assembly in accordance with an embodiment of the present invention
and illustrates (by way of broken lines) alternative larger
detachable outer support frames detachably connected to second and
third outer receiving tabs.
[0025] FIG. 6 is a top plan view of an exemplary "pattern" useful
in connection with the cutting of a flat permeable material sheet
into four separate pieces that are used (i.e., are sewn together)
to make an upper perimeter flange portion and a lower bag portion
of a filtering system in accordance with an embodiment of the
present invention.
[0026] FIG. 7A is a perspective view of an outer support frame made
from two heavy gauge U-shaped wires welded together in accordance
with an embodiment of the present invention.
[0027] FIG. 7B is a perspective view of an outer support frame made
from four L-shaped tubes that are telescopically interconnected
together in accordance with an alternative embodiment of the
present invention.
[0028] FIG. 8 is a perspective view of a removable catch basin
filter assembly in accordance with an alternative embodiment of the
present invention, and that shows an oil absorption "pillow" being
placed with the filtering system and the filtering system being
detached from a detachable outer support frame.
[0029] FIG. 9 is a perspective view of the removable catch basin
filter assembly of FIG. 8, but wherein the fabric material is
attached to the detachable outer support frame, and wherein one of
the four corner tabs is being pulled and tucked underneath the
outer support frame, and wherein each of the corners includes a
series of two tabs aligned in a row.
[0030] FIG. 10 is a perspective view of a removable catch basin
filter assembly in accordance with an alternative embodiment of the
present invention, and that shows a "pillow" being placed within
the flanged bowl and the flanged bowl being lowered into a catch
basin (with the grate being removed from the catch basin).
[0031] FIG. 11 is a perspective view of the removable catch basin
filter assembly shown in FIG. 10, but wherein the pillow has been
placed within the filtering system and the filtering system has
been lowered into the catch basin.
[0032] FIG. 12 is a perspective view of a removable catch basin
filter assembly in accordance with another embodiment of the
present invention, wherein the lower filter bag portion further
comprises a filtering media for enhanced filtering of oils, metals,
or both from stormwater.
DETAILED DESCRIPTION OF THE INVENTION
[0033] In the following detailed description, reference is made to
the accompanying drawings, which form a part hereof. In the
drawings, similar symbols or markings typically identify like or
corresponding elements, unless context dictates otherwise. The
illustrative embodiments described in the detailed description,
drawings, and claims are not meant to be limiting. Other
embodiments may be utilized, and other changes may be made, without
departing from the spirit or scope of the subject matter presented
herein.
[0034] Accordingly, and in view of the foregoing and referring now
to the drawings, and more particularly to FIGS. 1 through 14, the
present invention is directed to a removable catch basin filter
assembly 10 configured to fit within a catch basin 12 (best shown
in FIG. 12) of the type that collects and transmits stormwater
runoff. The catch basin 12 is generally rectangular or square
shaped; however, other geometries such as circular shaped are
considered to be within the scope of the present invention. As best
shown in FIG. 12, the catch basin 12 defines an upper perimeter
recessed ledge 14 sized to receive and support a grate 16.
[0035] As shown throughout the drawings, the removable catch basin
filter assembly 10 of the present invention comprises two distinct
and separable components; namely, (1) a rectangular or square
shaped rigid outer support frame 18 that is selectively sized to
fit on the upper perimeter recessed ledge 14 of the catch basin 12
and underneath the grate 16, and (2) a flexible material 20 that
defines a flanged bowl, wherein the flexible material 20 is
detachably connectable to the outer support frame 18 by way of four
receiving tabs 19a, 19b, 19c, 19d positioned at or near the four
corners 28a, 28b, 28c, 28d of the inner perimeter edge 26 of the
upper perimeter flange 22. As best shown in FIG. 7A, the outer
support frame 18 may be made from two heavy gauge U-shaped wires
welded together in an interlocking and confronting relationship so
as to define a square or rectangle. Alternatively, the outer
support frame 18 may be made similar to that of a picture frame, or
may even be (as best shown in FIG. 7B) made from four L-shaped
interconnected tubes telescopically adjustable to one another (so
as to define a plurality of different sized squares and/or
rectangles adapted to fit a plurality of different sized catch
basins). In all embodiments, however, the outer support frame 18 is
sized to fit on the upper perimeter recessed ledge 14 of the catch
basin 12.
[0036] As best shown in FIGS. 5 and 6, the flexible material 20 may
be made from a plurality of geotextile fabric pieces sewn together
along their respective edges so as to define an upper perimeter
flange 22 attached to a lower filter bag 24. As best shown in FIGS.
8 and 9, the junction of the lower filter bag 24 and the upper
perimeter flange 22 defines the inner perimeter edge 26 and its
four corners 28a, 28b, 28c, 28d. In other words, the upper
perimeter flange 22 is preferably attached to the lower filter bag
24 along an inner perimeter edge 26 to thereby define a flanged
bowl.
[0037] As best shown in FIG. 10, the lower filter bag 24 is sized
and configured to fit within the catch basin 12, whereas the upper
perimeter flange 22 is in some embodiments mostly external to the
catch basin 12 and lies flat on the ground 13. The lower filter bag
24 is preferably made of a water permeable material (e.g., a
geotextile fabric) capable of filtering one or more contaminates
contained within stormwater runoff (that collects within and
permeates through the lower filter bag 24 during a rainfall event).
The lower filter bag 24 preferably also contains one or more
spillways 23 positioned on its sidewalls to facilitate stormwater
overflow. In some embodiments (and as shown in FIGS. 3, 4, and 12),
the lower filter bag 24 contains, or is otherwise lined with, an
additional filtering media 25 for extra absorption and enhanced
filtering of oils, metals, or both from stormwater. For example,
the additional filtering media 25 may be a sodium-based ion
exchange resin adapted to remove one or metal contaminants
contained within the stormwater. In still further embodiments, a
separate pillow 27 containing additional filtering media may be
placed within the lower filter bag 24 to further enhance the
filtering and removal capabilities (of the removable catch basin
filter assembly 10).
[0038] In accordance with the present invention, the four receiving
tabs 19a, 19b, 19c, 19d are configured to detachably receive the
respective four corners 18a, 18b, 18c, 18d of the rigid outer
support frame 18. Because the upper perimeter recessed ledge 14 of
the catch basin 12 may be of slightly variable size, each of the
corners 28a, 28b, 28c, 28d associated with the inner perimeter edge
26 preferably includes a series of two or three tabs aligned in a
row 19a-a'', 19b-b'', 19c-c'', 19d-d''. In this configuration,
outer support frames 18 of slightly larger dimensions may be
selected and connected to the flexible material 20 in a readily
detachable manner. In all embodiments, however, the fabric material
20 is attached to the detachable outer support frame 18 by
appropriately inserting each corner 18a, 18b, 18c, 18d of the outer
support frame 18 into each respective receiving tab 19a, 19b, 19c,
19d of the flexible material 20 (which may be accomplished by
appropriate pulling and tucking of the fabric material 20 about the
rigid outer support frame 18).
[0039] In order to facilitate the insertion and/or removal of the
catch basin filter assembly 10 into and/or out of the catch basin
12, a pair of lifting straps 30a, 30b is provided (attached at or
near the four receiving tabs 19a, 19b, 19c, 19d). In some
embodiments, the pair of lifting straps 30a, 30b crisscross each
other (because in this configuration weight distribution during
lifting tends to be more balanced resulting in enhanced
ergonomics).
[0040] For purposes of illustration and not limitation, the
following examples more specifically disclose certain exemplary
test results associated with a removable catch basin filter
assembly made in accordance with the present invention.
EXAMPLES
[0041] The effectiveness of separations technology may be
determined by the percentage of removed unwanted substance(s) from
the solution or slurry. Although current stormwater separation
devices may be capable of removing metallic compounds from water,
when tested, their removal efficiency rates are invariably low at
around 5%-15%. The present invention when having an optional
additional filtering media made up of a sodium-based ion exchange
membrane has the capacity to remove up to 92% of all metals from
stormwater. Organics and suspended solids may also be efficiently
removed. The present invention removes metallic compounds found
within contaminated stormwater while maintaining concentrations of
total dissolved solids (TDS) and dissolved hydronium ions (pH).
[0042] The water treatment inserts may be replaced after
approximately three months, however, the frequency may be increased
in high-risk pollution areas or when there is an intensive use of
possible contaminants. The metallic compound absorption insert
removes debris, suspended solids, oil-based products and heavy
metals out of stormwater.
[0043] The present invention may be installed and maintained by the
in-house maintenance crew of an industrial facility, as it is easy
to use and includes ergonomic features.
ANALYTICAL TEST RESULTS
[0044] Project: Aerospace
TABLE-US-00001 Sample: GKN Front Inlet Lab ID: 259411001 Parameters
Results/Units 200.8 MET ICPMS Analytical Method: EPA 200.8 Copper
10.4 .mu.g/L Lead 2.9 .mu.g/L Nickel 1.5 .mu.g/L Zinc 39.5 .mu.g/L
HEM, Oil and Grease Analytical Method: EPA 1664A Oil and Grease ND
mg/L 2540D Total Suspended Solids Analytical Method: SM 2540D Total
Suspended Solids 38.0 mg/L 4500H+ pH, Electrometric Analytical
Method: SM 4500-H + B pH at 25 Degrees C. 6.1 Std. Units
[0045] Project: Aerospace
TABLE-US-00002 Sample: GKN Back Alley Outlet Lab ID: 259411004
Parameters Results/Units 200.8 MET ICPMS Analytical Method: EPA
200.8 Copper 10.6 .mu.g/L Lead 12.2 .mu.g/L Nickel 0.86 .mu.g/L
Zinc 51.9 .mu.g/L HEM, Oil and Grease Analytical Method: EPA 1664A
Oil and Grease ND mg/L 2540D Total Suspended Solids Analytical
Method: SM 2540D Total Suspended Solids 4.0 mg/L 4500H+ pH,
Electrometric Analytical Method: SM 4500-H + B pH at 25 Degrees C.
6.4 Std. Units
[0046] Aerospace--TDS Spike of Collected Storm Water (Listed in
Ppb)
TABLE-US-00003 Metals PreFilter Inlet PostFilter Outlet % Removal
14 Apr. 2011 Back Alley Extracted Chromium 881 98 88.9% Nickel 815
68.9 91.5% Copper 3,540 616 82.6% Zinc 39,700 2,910 92.7% Cadmium
<100 <10 Barium 3,790 305 92.0% Lead 23,800 2,520 89.4% 25
Apr. 2011 Back Alley Chromium 14.1 1.4 90.1% Nickel 12.5 1.4 88.8%
Copper 52 7.57 85.3% Zinc 897 126 86.0% Cadmium <1 <1 Barium
92 7.86 91.5% Lead 202 16 92.1% Turbidity 41 8.9 78.3% 1269.3
160.23 87.4% 27 Apr. 2011 Front Parking Chromium 2.44 2.89 -18.4%
Nickel 3.7 2.12 42.7% Copper 14 12.9 4.4% Zinc 44 58 -33.5% Cadmium
<1 <1 Barium 16 17.1 -8.2% Lead 6 5 5.3% Turbidity 7.9 19
-140.5% 84.7 98.6 -16.4%
[0047] Aerospace--TDS Spike of Collected Slurry Water (Listed in
Ppb)
TABLE-US-00004 Metals PreFilter Inlet PostFilter Outlet % Removal
26 Oct. 2011 Back Alley Nickel 3.8 0.86 77.4% Copper 28 10.6 62.1%
Zinc 367 51.9 85.9% Lead 60 12.2 79.6% Totals 459 75.56 83.5% Oil
& Grease 1400 ND 100.0% TSS 90000 4000 95.6% pH 6 6.4 26 Oct.
2011 Front Parking Lot Nickel 1.5 1.1 26.7% Copper 10 7.5 27.9%
Zinc 40 24 40.5% Lead 2.9 3.1 -6.9% Totals 54.3 35.2 35.2% Oil
& Grease ND ND 0.0% TSS 38000 8000 78.9% pH 6 6.4
[0048] While the present invention has been described in the
context of the embodiments illustrated and described herein, the
invention may be embodied in other specific ways or in other
specific forms without departing from its spirit or essential
characteristics. Therefore, the described embodiments are to be
considered in all respects as illustrative and not restrictive. The
scope of the invention is, therefore, indicated by the appended
claims rather than by the foregoing descriptions, and all changes
that come within the meaning and range of equivalency of the claims
are to be embraced within their scope.
* * * * *