HomeMy WebLinkAboutPermit L93-0030 - KING COUNTY - METRO SOUTH OPERATING BASE / ENVIRONMENTAL IMPACT STATEMENT (EIS)l93-0030 metro south operating base underground storage tank replacement sepa
ENVIRONMENTAL IMPACT STATEMENT (EIS)
►:METRO"
Municipality of Metropolitan Seattle
Exchange Building • 821 Second Ave. • Seattle, WA 98104 -1598 • (206) 684 -2100
ADDENDUM
to the
ENVIRONMENTAL CHECKLIST
and DETERMINATION OF NONSIGNIFICANCE (DNS)
issued for the
SOUTH OPERATING BASE
UNDERGROUND STORAGE TANK REPLACEMENT PROJECT
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INTRODUCTION: On November 27, 1991, The Municipality of Metropolitan Seattle
(METRO) issued a Determination of Nonsignificance (DNS) and Environmental Checklist
for the South Operating Base Underground Storage Tank Replacement Project. A
consultant study to determine the extent of possible soil and groundwater contamination
was in progress at the time of issuance of the DNS and Checklist. This addendum
describes the results of that study and provides details about the remediation of soil and
groundwater contamination on the site.
BACKGROUND
On January 21, 1992, the consultant firm Enviros completed a focused soil and
groundwater assessment at Metro's South Operating Base as part of the project pre - design
effort. The results of the assessment indicated that there was petroleum contamination of
soils and groundwater at the site. Soil and groundwater samples were taken around the
existing UST's, and assumtions were made where samples could not be obtained. The
estimated volumes of petroleum- contaminated material that will require cleanup are 6,620
cubic yards (excavated volume) of soil and 800,000 gallons of groundwater. Larger or
smaller volumes could be found during actual construction. Metro staff believes the
estimated volumes are conservative (high).
Because the estimated contamination volumes were considerably higher than planning
level estimates, construction of the project was postponed by one year to permit further
assessment and design efforts. Metro and Enviros proceeded with additional site
assessments, treatment process studies, and a feasibility study. A final report by Enviros
outlined the work performed and presented a refined recommendation for the cleanup
method. Below is a summary of findings, conclusions and proposed treatment processes
from that report. A copy of the final report is available for review upon request. The
attached project site plan contains additional details.
PROPOSED SOIL TREATMENT PROCESS
The above volumes of contaminated soil are assumed to contain a high percentage of fine -
grained sands and silty sands. In the worst -case scenario, the contaminants would consist of
approximately equal percentages of gasoline, diesel and heavy oils. Metro staff believes
that these assumptions are conservative and that up to 8010 of the contaminated soils will
be gravels and coarse - grained sand, contaminated primarily with gasoline.
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The recommended cleanup methods include a combination of the thin spread (commonly
termed "landfarm ") and aerated pile processes to treat the contaminated soils. The
treatment work by these processes would be performed in a 2 -acre area of the undeveloped
portion of the South Base Annex facility.
Under the surface thin - spread treatment, the soils would be placed into a lined and bermed
cell and would be periodically tilled and mixed with water, oxygen and nutrients. This
process could be used to treat all contaminated soils expected at South Base, at a batch
production rate of approximately 2,000 cubic yards every 2 months.
Under aerated pile treatment, the soils would be partially sealed into a lined and bermed
cell containing an embedded system of perforated piping through which oxygen is drawn.
This process would be used for treating sand and gravely soils contaminated with light
hydrocarbons such as gasoline, at a production rate of approximately 500 cubic yards per
week. This treatment is not effective in removing diesels and heavy oils.
The proposed treatment combination will not leave highly contaminated residuals difficult
to treat or dispose of, such as the rinsate and sludge by- products of soil washing. If, at the
time of excavation, the nature and extent of contamination is significantly different than
anticipated, thermal or mechanical soil washing units could be mobilized for remediation.
Procedures for contaminated soils treatment will be as follows:
1. The thin spread and aerated pile processes would be performed in a 2 -acre area of
the undeveloped portion of the South Base Annex facility (see attached site plan).
2. Treated soils will be used as backfill material for the UST project to the maximum
extent consistent with the construction schedule.
3. If treated soils are not available for incorporation to the UST /Pavement project as
backfill, the contractor will import clean backfill material as required to maintain
contruction work uninterrupted.
4. Soils that do not respond to the selected treatment process in time to be used as
backfill, but meet the MTCA Class 2 standard by March, 1994, will be disposed of
by the contractor as construction debris. Other soils will continue to be treated at
the South Base Annex through September of 1994. After that, soils that meet the
MTCA Class 2 standard will also be disposed of as construction debris under a
separate contract, or used as backfill material for projects that Metro may have
under construction at the time.
5. Soils that have not attained the MTCA Class 2 standard by September of 1994, may
continue to be treated and dispersed at the Annex if economicaly feasible.
Otherwise, they will be disposed of as contaminated material at a permitted site.
The treatment operations will be conducted in accordance with the Washington
Department of Ecology guidance and regulations. During operation of the treatment
system, best management practices will be used to minimize the contact of contaminated
soils with surface water. Leachate will be controlled in a lined collector ditch and will be
pumped out periodically during treatment to prevent runoff to surface water. Erosion
control will be implemented during treatment operations in accordance with King County
standards.
2
PROPOSED GROUNDWATER TREATMENT PROCESS
The recommended treatment process for contaminated groundwater is air stripping. The
treatment work by this process will be performed in a 1,000 square foot area, east of the
Fuel /Wash Building at South Base (see attached site plan). The treatment equipment will
consist of a stripping tower and an oil /water separator. Once the contaminants have been
removed to allowable levels, the treated groundwater will be disposed of in the existing
sanitary sewer. Treatment will be accomplished as construction of the UST project
progresses.
Air stripping treatment removes contaminants by distributing water downward in a tower
packed with porous media, and blowing air upward through the packing media.
SURFACE WATER RUNOFF
Surface water controls are designed based on the "King County Surface Water Design
Manual." On site runoff controls are provided for the 2 -yr /24 hr, 10- yr /24 -hr, 100- yr /24 -hr,
and 100 -yr /7 -day storm events, such that post - development runoff from the site will
discharge at no more than 0.5 cfs greater than pre - development rates. Water runoff quality
and sediment control will also be provided using a wetpond and an oil pollution control on
the outlet structure. The wetpond and detention pond are "stacked" into one pond as
allowed by the Design Manual. Temporary and erosion controls will be implemented
during construction of the facility in accordance with King County requirements.
Off -site drainage which runs on to the proposed treatment facility will be collected in storm
drain collectors and routed around the site. Stormwater from the detention facility and the
off -site drainage collectors will then be routed north of the property to a natural drainage
which discharges to the Duwamish channel approximately 1/4 -mile north of the South Base
Annex. See attached site plan for details.
GRADING PLAN
Following is a summary of the grading plan for approximately 2 acres of property at the
Metro South Base that will be used as a temporary treatment facility for petroleum
hydrocarbon - containing soils.
The cut and fill volumes were calculated by dividing the site into three areas: the
remediation area, the detention pond, and the drainage ditch. The cross sections of these
areas were simplified. No fill was required for the initial grading, and the volume cut was
determined to be approximately 560 cubic yards. This volume is based on a 1 percent
downhill gradient in the remediation area from south to north.
Approximately 550 cubic yards of soil is needed to line the thin spread area (6 inches thick)
before the affected soil is placed. This soil can be taken from the excess soil that was cut
during grading; therefore, alleviating the need for borrow material. Approximately 1320
cubic yards of imported base course material is required to allow a 4 -inch layer under the
pavement.
The following material is required for the stormwater control facility. The spillway
between the two detention ponds, the ditch overflow, and the rip rap for outfall require 35
cubic yards of quarry spalls. The gravel filter berm requires 45 cubic yards of gravel. The
flexible pipe requires 150 cubic yards of gravel bedding, and the catch basins require 5
cubic yards of pea gravel for bedding.
3
. . ..,.
PROJECT SCHEDULE
Based on the scope of work detailed above for the recommended alternative, the major
milestones of the project schedule would be as follows:
Design Completion 03/26/93
Bid Opening 04/26/93
Notice to Proceed 06/10/93
Completion of Pavement Work
and Underground Installations 12/31/93
Completion of other work 03/05/94
Completion of Soils Treatment 03/05/94
Final Completion 03/05/94
DATE: April 14, 1993
CONTACT PERSON: Gary Kriedt, Environmental Planner
TELEPHONE NUMBER: (206) 684 -1166
ADDRESS: 821 Second Avenue, M.S. 120, Seattle, Washington 98104
This addendum is available in accessible formats on request.
A
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REVISION
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L= 225.19'
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enviros
5808 LAKE WASHINGTON BOLLEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
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SOUTH BASE ANNEX
SITE IMPROVEMENTS
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— ACCESS ROAD
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N 86.45' 29"W(365.88') �-
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EDGE OF EXISTING PAVING
NEVI STORM MANAGE GE COLLECTION
(FOR PROFILE SEE DRO C604)
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16' • CPE
CONTRACTOR'S GATE
(EXIST 28' SLIDING GATE)
25' DRIVEWAY
SANITARY SEWER
PUMP STATION
N87.30' 37"
TRANSIT
TRAININ A
100'
1..50'
N 85 32' 54" W 114
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— - — CENTER UNE
— - - — PROPERTY LINE
— - - - — EASEMENT LINE
— —•— FENCE
•}* FH FIRE HYDRANT
o LP UGHT POLE
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—S5— SANITARY SEWER (CONCRETE
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PROPERTY
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N715'43'27"E
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5808 LAKE WASHINGTON BOILEVARD NORTHEAST
KIRKLAND. WASHINGTON 98033
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5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
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EXISTI
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IRRIGATION CONTROL VALVES
SLOPE 1•+ WISTING GRADE
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NOTES: _
1 EXISTING FENCE FOR METRO SOUTH CONSTRUCTION
_120•-- NEW CONTOURS
----•t2.0' EXISTING CONTOURS
EDGE OF NEW ASPHALT
-- CENTER UNE
- --- PROPERTY UNE
EASEMENT UNE
--X-- CONSTRUCTION FENCE
— .—•— EXISTING FENCE
-� FH FIRE HYDRANT
o Lp UGHT POLE
• PROTECTION POST
o FP RAG POLE
— SS SANITARY SEWER (CONC.
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DI DUCTILE IRON
o GC0 CLEAN -OUT TO GRADE
t0 20 30 40 50
SCALE: I. - 20'
SOUR NTERWi. EQUALS OA F001
GIMETRO IINDRIFoltY °"`°l'" %NW*
SOWN pIPSE / UNIT RE INA
UNDERGROUND TANK REPLACEMDIT
SOUTH BASE ANNEX
GRADING AND PAVING PLAN
EDGE OF EXISTING PAVING
•
•
12.0•
ASPFMLT ACCESS ROAD
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NEW ASPHALT PAVING
SEE DETAL B/CtT03'
AIL
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5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND• WASHINGTON 98033
-- 10.5'.. •__.___._.__.
-•-•". t 1
REINFORCED POLYETHYLENE UNED
DETENTION DITCH
11.5•••••`
sawn
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EXIST ELECTRIC CONDUIT
12.5•--
CONNECT NOV TEMPOSARt
FENCE ID E70 MHG FEE
LP
LOCIS' WOE
LOCKABLE WOKE
SEE NOTE 1
EXISTING CHAIN
LINK FENCE
SANITARY SEWER
PUMP STATION
i
IRRIGATION CONTROL VALVES
EXISTING CHAIN
LINK FENCE
N
NOTES:
1. CONTRACTOR TO INSTALL 3' 'NICE LOCKABLE CHAIN UNK GATE IN
EXISTING FENCE FOR METRO SOUTH CONSTRUCTION ACCESS.
—14.0'— NEW CONTOURS
L y,p•__... EXISTING CONTOURS
- -- EDGE OF NEW ASPHALT PAVEMENT
- — — CENTER UNE
_ _ PROPERTY UNE
EASEMENT LINE
X CONSTRUCTION FENCE
- —_— EXISTING FENCE
-4 Fri FIRE HYDRANT
o Lp UGHT POLE
PROTECTION POST
O FP FLAG POLE
— SS — SANITARY SEWER (CONCRETE
PIPE UNLESS NOTED)
DI DUCTILE IRON •
O GCO CLEAN -OUT TO GRADE
10 20 30 40 50
SCALE: 1' •• 20'
CONTOUR INTERVAL EQUhIS 0.5 FOOT
A
8
C
0
F
H
5
4
4
4
EL 11.0'
EL 11.5'
EL 4.87'
EL 8.67'
EL 10.9'
MAXIMUM WATER SURFACE
OF DESIGN STORM
G VE LI ER eERAT
RIP RAP, 1'-O.
MIN THICKNESS
FLOW CONTROL STRUCTURE
SEE DWG A/C604
R-25' MIN
EL 11.0'
EL 8.67'
EL 4.87'
1%/:11T1T
EL 10.5'
GRAVEL ACCESS ROAD,
EL 8.67'
EL 11.5'
EL 10.0'
EL 7.5'
EL 11.0'
EL 10.1'
EL 11.0'
11.0'
EL 8.17'
WET POND AND STORMWATER DETENTION FACILITY
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'4//> \r‘\‘
MIN
2'-0•
MIN
COMPACTED SUBGRADE
TO A DEPTH OF 8'
TYPICAL PAVEMENT CROSS SECTION
EL 11.5'
DETAIL (B
SCALE: r - 1'-Or C601 C602
POLYETHYLENE LINER
EL 11.0'
EL 8.25' MAX / \
18'-O MIN
STORMWATER DETENTION DITCH
SECTION
SCALE 1/4' - 1'-D•
Lq3-GDSo
No.
REVISION
BY APP'D DATE
GRAVEL FILTER BERM
SEE DWG C/C603
NEW ASPHALT
CONCRETE PAVEMENT
3'-0'
MIN
en viros
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
1727
EL 11.5'
EL 8.25'
GRAB FILTER BERM
SEE DWG /
EL 11.0'
ASPHALT PAVEMENT
ON ADJACENT SITE INTO POND
\t„
SITE BOUNDARY
J i
OMENCIk
vs(4/Wh
BERM
POND PROFILE
HORIZONTAL SCALE: 1' - 20'
VERTICAL SCALE: 1' - 5'
GRAVEL ACCESS ROAD POND ACCESS ROAD WITH
ASPHALT SURFACE
POND ACCESS ROAD
SECTION
HORIZONTAL SCALE: 1' - 10'
VERTICAL SCALE 1' - 5'
3/4 TO r CRUSHED ROCK
WITH LESS THAN 5/1 FINES
NEW ASPHALT CONCRI
PAVEMENT
ASPHALT-LNED
DITCH
GRAVEL FLL
SEEDWGI
THIN SPRE
11<
di mOTRO d thatu.
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*11
await
MUMNMOCCM
AS NOTED
CONTIOcT ram
T/11 11-93
SOWN RASE / IJIT REPAR
UIOERG 0I N D TANK REPLACEMENT
SOUTH BASE ANNEX
POND FACILITIES & DETAILS
B
C
0
E
F
H
MAXIMUM WATER SURFACE
OF DESIGN STORY
EL 11.0'
EL 8.67'
EL 4.87'
EL 4.67'
ACCESS ROAD
fERT
RIP RAP, 1'-O'
MIN THICKNESS
UCTURE
aaPa��a aI?a
giV•AAPIo •a
• COMPACTED SUBGRADE
TO A DEPTH OF r
ENT CROSS SECTION
Tam
C602
POLYETHYLENE LINER
EL 11.0'
EL 8.25' MAX
f MIN
EL 10.5'
GRAVEL ACCESS ROAD,
EL 11.5'
EL 10.0'
EL 8.67'
A loriir
YIN
ii
di
!i
`� I���L
�-1 EL 11.0'
EL 10.1'
EL 11.0'
11.0'
EL 8.17'
EL 7.5'
WET POND AND STCRMWATER DETENTION FACILITY
SFILTER DWG C/
SEE
BERM
C603
NEW ASPHALT
CONCRETE PAVEMENT
IETEN11ON DITCH
YIN
3'-0"
H
MIN
en viros
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
EL 11.5'
EL 8.25'
GRAVEL FILTER BERM
SEE DWG C/C603
EL 11.0'
11 -
10-
9
8
7 -
6
5 -
4
4
ASPHALT PAVEMENT GRAVEL ACCESS ROAD
ON ADJACENT SITE ¢ INTO POND
\L„
SITE BOUNDARY
1 3
I 3
Rsy lW C,
BERM
DETAIL
SCALE 1/2^ - 1'-7
POND PROFILE
HORIZONTAL SCALE: I. - 20'
VERTICAL SCALE: 1' - 5'
3/4" TO r CRUSHED ROCK
WITH LESS THAN 5% FINES
NEW ASPHALT CONCRETE
PAVEMENT
f
ASPHALT -LINED
POND ACCESS ROAD WITH / DITCH / GGRAVEL EE DWG CTER BERM
ASPHALT SURFACE - 1
'THIN SPREAD PILE
YIN.
POND ACCESS ROAD
SECTION
HORIZONTAL SCALE 1' - 10'
VERTICAL SCALE 1• - 5'
y "ME
T A o Iloablp.Mt, d Netopolltaa Seattle
OTT:
HATCH 1993
COMM L
W.CCW�o/ome
r.
AS NOTED
!WM V.M-'19
AR�PR]f.
cONT* cT No:
T/II 11-93
SOUTH BASE / UPC REPAR
UICERGROUFC TANK LACOE T
SOUTH BASE ANNEX
POND FACILITIES do DETAILS
numo:
X14
OMwC No
C603
WIT ND Of
32 63
5
4
3
2
Source File PAPROJECTS\TRANIASE\Sl\X14\1X14C603
BY APP'D DATE
A 8
•
D
G
H
FLEX COUPLING
12- to CPE PIPE- \
SHEAR GATE WITH CONTROL
ROD FOR CLEANOUT/DRAIN
(SEE KING COUNTRY ROAD
STANDARDS DWG 53)
12' • CMP PIPE
EL 11.25'
1'-6'
MIN
EL 10.0'
0.005 FT/FT
EL 6.67'
PIPE SUPPORT (SEE NOTE 5)
1'-Er LENGTH OF PIPE ATTACHED BY
GASKETED BAND TO ALLOW REMOVAL•
RESTRICTOR PLATE. WELDED
TO PIPE WITH 4.35' ORIFICE
NOTES:
•
11 EL 6.67'
24 DIA ACCESS OPENING WITH SOLO LOCKING
UD, CAST FRAME IN TOP SLAB (SEE NOTE 3 AND
KING COUNTY ROAD STANDARDS OWGS 49 & 50)
3/4' GALV REBAR SPACED 4' OC IN
FRAME. LENGTH OF OPENING IS 2'-O'
/-MAXIMUM WATER SURFACE
OF DESIGN STORM
0.005 FT/FT
a
1. USE MIN 54' DIA CATCH BASIN TYPE 2.
SEE KING COUNTY ROAD STANDARDS DWG 52.
2. OUTLET CAPACITY: NOT LESS THAN COMBINED INLETS.
3. METAL PARTS: CORROSION RESISTANT. GALVANIZED PIPE PARTS
TO HAVE ASPHALT TREATMENT 1.
4. FRAME ANO LADDER OR ItPS OFFSET S0:
A. CLEANOUT GATE IS VISIBLE FROM TOP.
B. CLIMB -DOWN SPACE 1S CLEAR OF RISER AND CLEANOUT GATE.
C. FRAME IS CLEAR OF CURB.
S. PROVIDE AT LEAST ONE 3' x .090 GAGE SUPPORT BRACKET
ANCHORED CONCRETE WALL (MAX 3'-0' VERTICAL SPACING).
L-93,-003ci
FLOW CONTROL STRUCTURE
PLAN
SCALE: 3/4' -
No.
REVISION
BY APP'D DATE
\--12 • CPE PIPE
54' • TYPE 2 CATCH BASIN
(SEE KING COUNTY ROAD
STANDARDS DWG 52)
12' • CPE INLET PIPE
24' • ACCE55 OPENING
CATCH BASIN STEPS
SEE NOTE 4
enviros
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
20.00
15.00
10.00
5.00
20.00
15.00
10.00
5.00
20.00
15.00
10.00 —
5.00
T�
com
co
4
0
12' DIA CPE PIPE
150' 0 0.005 FT/FT
FINISH GRADE
N
U W
I • I '
0+00 20
I I I
40
60
80
1+00
20
40
18' DIA CPE PIPE
0
+
150' • 0.004 FT/FT
EXISTING GRADE
T
I I I
60 80 2+00 20 40 2+60
STORM DRAIN PROFILE
16' 01A CPE PIPE
18. DIA CPE PIPE
DUSTING GRADE
I I
2+20 40
60
80
150' • 0.004 FT/FT
FINISH GRADE
3+00
20
16' DIA CPE PIPE
40 60
80
I I
4+00
STORM DRAIN PROFILE
60' • 0.004 FT/FT
20 40 80 60 5+00
te' oA CPE PIPE
E +
▪ •
Ti▪ W
150' • 0.0035 FT/FT
EXISTING PAVING
130' • 0.0035 FT/FT
SEE DET A/C605
5+00 20
12' DIA CPE PIPE FROM
FLOW CONTROL STRUCTURE
IE 8.00'
40
60
60
6+00
20
r� y-,14.1
40
60
1.
�nI
yilti
60
STORM DRAIN PROFILE
ocsamck
g44/w4
1151.
11/4
7+00 20 40 60 60 81
�,'�*.METH O 11121248ntY� "90191• BMWs
AS NOTED
CCNINCT N0:
T/1. 11-93
SOUTH BASE PAST EMIR
UNDENG•0190 TAMK REAACEii4T
SOUTH BASE ANNEX
FLOW CONTROL STRUCTURE
AND STORM DRAIN PROFILE
•
C
b
W EL 6.67'
b
N
20.00
24' DIA ACCESS OPENING WITH SOU) LOCKINGUD. CAST FRAME IN TOP SLAB —
NOTE 3 AND
KING COUNTY ROAD STANDARDS(SEE DWCS 49 & 0) —co
oO
15.00 _ c��+
3/4' GALV REBAR SPACED 4' OC IN
FRAME, LENGTH OF OPENING IS 2'—O —
MAXIMUM WATER SURFACE
�OF DESIGN STORM
0.005 FT/FT
SECTION
SCALE 3/4' - 1'—
ETS.
ED PIPE PARTS
Xl ClEANOUT GATE.
r BRACKET
LL.. SPACING).
FLOW CONTROL STRUCTURE
PLAN
SCALE: 3/4' - 1'-0'
12 0 CPE PIPE
54 0 TYPE 2 CATCH BASIN
(SEE KING COUNTY ROAD
STANDARDS DWG 52)
1r 0 CPE INLET PIPE
24' 0 ACCESS OPENING
CATCH BASIN STEPS
SEE NOTE 4
10.00
5.00
20.00
15.00 _
10.00
5.00
20.00 _
15.00
10.00
5.00 —
+
O
12' DIA CPE PIPE
150' • 0.005 FT/FT
FINISH GRADE
18' DIA CPE PIPE
N
n
U
I•
0+00 20 40 60 80 1+00 20 40 60 80 2+00 20 40 2+60
0
150' • 0.004 FT/FT
EXISTING GRADE
T
1 1 1 1 1 I 1 I I
STORM DRAIN PROFILE
18 DIA CPE PIPE
18' DIA CPE PIPE
Exotic GRADE
150' • 0.004 FT/FT
FINISH GRADE
I I I I I I I I
2+20 40 60 80 3+00 20 40 60 80 4+00 20 40 60 80 5+00
STORM DRAIN PROFILE
60' • 0.004 FT/FT
18 DIA CPE PIPE
150' • 0.0035 FT/FT
EXISTING PAVING
I
18' DIA CPE PIPE
130' • 0.0035 FT/FT
0
SEE DET A/C605 � 1Wi
5+00
12' DA CPE PIPE FROM
FLOW CONTROL STRUCTURE
IE 8.00'
20 0
60 60 6+00
BY APP'0 DATE
en viros
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
20 40
tom' -14 I
6o
80 7+00
STORM DRAIN PROFILE
I I i
20 40 60
i
6o 8+00
GEVON17k
RJG/W4
114
a
ate
m ET R o ,dgm,tp.yt, aE 11:feo,dll.• 61wti,.
WALE
AS NOTED
COKI O NO:.
T/Y 11-93
SOUTH BASE / UNIT WPM
UN0ERG 0U10 TANK REPLACOANT
SOUTH BASE ANNEX
FLOW CONTROL STRUCTURE
AND STORM DRAIN PROFILE
DOT.:
ilARCH 1013
RE NO:
X14
OMwIG NO:
C604
WET NO: OF
33 63
A
c
H
1.I 1 I —I I
—111 11111
NOTE EXTEND RIPRAP MINIMUM
TO EITHER SIDE OF OUTFALL PIPE.
MITER CUT PIPE
TO MATCH SIDE
Y 0.035FT/FT . F ^
ter DIA CPE PIPE
EODUIIADON
TANK
SPOT*
GROUNDWATER EXTRACTION
PUMP P1
GROUNDWATER FROM
UST EXCAVATION AREAS
IE 5.0'
RIPRAP. 1'-0. MIN THICKNESS
OUTFALL
DETAIL (A�
SCALE: 3/8" - 1'-0' C601 C604
TRANSFER
PUMP P2
SEDIMENT FILTERS
do
EMISSION
J/—CONTROL
e UNIT
AMBIENT AIR —Er
BLOWER 81
SUMP F
AR STRIPPER
MOBILE GROUNDWATER TREATMENT SYSTEM,
PIPING & INSTRUMENTATION DIAGRAM
DETAIL
SC. ALE NITS
Lq3-On30
No.
REVISION
BY
APP'D
DATE
FLOW
METER
g TRANSFER
PUMP P3
en viros
TREATED EFFLUENT
CISCHARGE TO
SANITARY SEWER
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
LIFT ROD
TOP SLAB
SHEAR CLJ ROUT GATE
1/3" • CPE PIPE (TYP
FLOW —
MORTAR FILL
REINFORCING STEEL
(FOR SEPARATE BASE
ONLY) 0.23 SO IN/FT
IN EACH DIRECTION
FRAME AND GRATE
SEE NOTE 2
LADDER RUNG
HANDHOLDS
LEVEUNG BRICKS
OR EQUAL
CAP TEE
FLDOBLE COUPLING
18' 0 CPE PIPE (TYP)
PRECAST BASE AND
INTEGRAL RISER
REINFORCING STEEL
FOR PRECAST
CRAL RISER 0.15 SO IN/FT
IN EACH DIRECTION
6' MIN BEDDING
FOR PRECAST BASE
NOTES:
1. FOR MORE DETAILS AND NOTES SEE DWG 33 CATCH BASIN TYPE 2 KING COUNTY
ROAD STANDARDS 1967.
2. FOR CATCH BASINS 4 THROUGH 6 USE 24 DIA MANHOLE RING AND COVER.
STORM DRAINAGE CATCH BASIN
DETAIL
SCALE: 3/44 - 1'-7
R.1G/HJGH
NOTES:
1. SEDIMENT IN RUNOFF FROM DISTURBED AREAS SHALL BE CONTROL
AT MINIMUM BY FILTER FENCE. STRAW 8111E BARRIERS. DMA SEX
DAMS. OR TEMPORARY SEDIMENT TRAPS.
2. RESTORE AREAS OUTSIDE UNITS OF FAL BY LEVELING AND SM0071
THE GROUND SURFACE.
3. REMOVE AND RESTORE DISTURBED AREAS OF ALL TOi0RARY ESC
FACILITIES AT COMPLETION OF CONSTRUCTION IN COMPLMNCE WHIN
SPECIFICATIONS.
4. ALL REQUIRED STORM WATER DETENTION FACILITIES MUST BE CONS
AND IN OPERATION PRIOR TO ANY PAVING UNLESS OTHERWISE APP
BY THE ENGINEER.
5. THE CONTRACTOR SHALL BE RESPONSIBLE FOR CLEAN UP OF STRI
AND ADJACENT PROPERTY AS REQUIRED DURING CONSTRUCTION.
P & ID LEGEND
VALVE AND PIPING SYMBOLS
-Ms
VALVE
CHECK VALVE
UNION
VALVE OPERATOR SYMBOLS
-0To- HANOVMEEL OR LEVER
EQUIPMENT SYMBOLS
SEDIMENT FILTER
m TURBINE OR PROPELLER
TYPE O,' MEER
BLOWER
PUMP
UNE SYMBOLS
PROCESS PIPES AND CRAWLS
ELECTRIC SGNAL
PROCESS UNE ABBREVIATIONS
• SAMPLE POUR
O DRAIN
✓ VENT
GENERAL INSTRUMENT SYMBOLS
• INTERLOCK
• SINGLE VARIABLE
mETRO et listreguilm IllsWe
r�. ldf44s,
WALE:
A3 NOTED
CONTRACT NO:
T/11 11-93
SOUTH BASE / UNIT REPAIR
UNDERGROUND TAW RRACE NDR
SOUTH BASE ANNEX -
GROUNDWATER TREATMENT SYSTEM P & ID
AND MISCELLANEOUS DETAILS
WRAP 3"-cf MINIMUM
NOTE: EXTEND
SIDE OF OUTFiU. PIPE.
METER CUT PIPE
TO MATCH SIDE
C601 C604
t.TREATMENT SYSTEM
ENTATION DIAGRAM
BY
APP'D
DATE
en virus
5808 LAKE WASHINGTON BOULEVARD NORTHEAST
KIRKLAND, WASHINGTON 98033
TOP SLAB
SHEAR CLEAROUT GATE
16 • CPE PIPE (TYP
FLOW —
MORTAR nu
LIFT ROD
FRAME AND GRATE
SEE NOTE 2
A
REINFORCING STEEL
(FOR SEPARATE DBASE
ONLY) 0.23 IN EACH DIRECTION
- +I
SEPARATE CAST IN PLACE
BASE OR SEPARATE
PRECAST BASE
LADOER G
HANDHCthS
OR EQUALBR
CUP TEE
FUMBLE COUPLING
I • CPE PIPE
— . FLAW
7 PRECAST BASE AND
INTEGRAL RISER
REIFORCING STEEL
(FOR
INTEGRAL BASE).5 SQ IN/FT
IN EACH DIRECTION 9
6' MIN BEDDING
FOR PRECAST BASE
NOTES:
1. FOR MORE DETAILS AND NOTES SEE DWG 33 CATCH BASIN TYPE 2 KING COUNTY
ROAD STANDARDS 1967.
2. FOR CATCH BASINS 4 THROUGH 6 USE 24' DIA MANHOLE RING AND COVER.
STORM DRAINAGE CATCH BASIN
DETAIL
SCALE: 3/4' - 1'-O'
NOTES:
1. SEDIMENT IN RUNOFF FROM DISTURBED AREAS SHALL BE CONTROLLED
AT MINIMUM BY FILTER FENCE. STRAW BALE BARRIERS. DITCH SEDIMENT
DAMS, OR TEMPORARY SEDIMENT TRAPS.
2. RESTORE AREAS OUTSIDE UNITS OF FILL BY LEVELING MID SMOOTHING
THE GROUND SURFACE.
3. REMOVE AND RESTORE DISTURBED AREAS OF ALL TEMPORARY ESC
FACILITIES AT COMPLETION OF CONSTRUCTION IN COI/PUMICE WRN THE
SPECIFICATIONS.
4. ALL REQUIRED STORM WATER DETENTION FACIU11ES MUST BE CONSTRUCTED
AND IN OPERATION PRIOR TO ANY PAVING UNLESS OTHERWISE APPROVED
BY THE ENGINEER.
S. THE CONTRACTOR SHALL BE RESPONSIBLE FOR CLEAR UP OF STREET
AND ADJACENT PROPERTY AS REQUIRED DURING CONSTRUCTION.
P & ID LEGEND
VALVE AND PIPING SYMBOLS
—lit-
-ijH
VALVE
CHECK VALVE
UrMON
VALVE OPERATOR SYMBOLS
-DTo-- KM/WHEEL OR LEVER
EQUIPMENT SYMBOLS
AT —
▪ SEDIMENT FILTER
m TYPE OW MEOR PROPELLER
BLOWER
PUMP
LINE SYMBOLS
PROCESS PIPES AND CHANNELS
ELECTRIC SIGNAL
PROCESS UNE ABBREVIATIONS
IP SAMPLE POINT
D DRAIN
V VENT
GENERAL INSTRUMENT SYMBOLS
Oi INTERLOCK
SINGLE VARIABLE
▪ METRO Ylol t>r of ll•hY!•ilsS 11Mattb
DAL
wog 1663
�J,J?
155
NECONN��orao[
L,l12sy
74V4-
>
AS NOTED
IOIIIR R NO:
T/Y 11-93
SOUTH dLSE / UNIT KFJA6t
UNDERGROUND TAIL lA1 OE II
SOUTH BASE ANNEX
GROUNDWATER TREATMENT SYSTEM P & ID
AND MISCELLANEOUS DETAILS
FIEF
X14
OWNING Kt
C605
SHUT Or
34 63