HomeMy WebLinkAboutD-286700n F
S
W
Al 4
l � w
N
e FH
¢u�o
iy Az2
3S°
a
i
J
E
8
a
9
S
rc
b
i
w
c
0
0
N
m
Z
O
CC U)
r`r�^ 5;
rrvJ, C:)
�Y d
qz
O O
I—
Df
En
(� Z
O
0 0
wzL C
y U _
I
z aW
W 0-
•v E
c �
•� d
atc
c
ov
a�
S
Q
O
z
�6
z
0
CONSTRUCTION PROVISIONS
S
THE PROJECT IS TO BE BUILT AND CONSTRUCTED IN ACCORDANCE WITH THE "1998 STANDARD SPECIFICATIONS FOR ROAD, BRIDGE,
AND MUNICIPAL CONSTRUCTION,' PREPARED JOINTLY BY THE WASHINGTON STATE DEPARTMENT OF TRANSPORTATION AND THE
WASHINGTON STATE CHAPTER OF THE AMERICAN PUBUC WORKS ASSOCIATION AS AMENDED REGULARLY BY THE WASHINGTON STATE
DEPARTMENT OF TRANSPORTATION, AND HEREINAFTER REFERRED TO AS THE "STANDARD SPECIFICATIONS," EXCEPT WHERE HEREIN
SUPPLEMENTED OR MODIFIED IN THESE DOCUMENTS. IMPROVEMENTS IN KING COUNTY RIGHT -OF -WAY SHALL ALSO CONFORM TO
THE LATEST REVISION OF THE KING COUNTY ROAD STANDARDS. IN CASES OF CONFLICT THE FOLLOWING SUPPLEMENTS AND
MODIFICATIONS SUPERSEDE THE STANDARD SPECIFICATIONS.
2. TRENCH EXCAVATION. FOUNDATION BEDDING AND BACKFILL
THE CONTRACTOR SHALL EXCAVATE ALL MATERIALS ENCOUNTERED TO THE DEPTH SHOWN ON THE DRAWINGS AS SPECIFIED, OR AS
DIRECTED BY THE ENGINEER.
WHEN NATIVE MATERIAL AT THE TRENCH BOTTOM IS SUITABLE FOR PIPE BEDDING, THE BOTTOM SHALL BE HAND FINISHED TO GRADE
SO THAT THE PIPE WILL HAVE UNIFORM SUPPORT ALONG THE BARREL AND BELL. AFTER THE PIPE IS IN PLACE, ADDITIONAL
HAND - SELECTED NATIVE MATERIAL SHALL BE PLACED AND TAMPED IN PLACE AROUND THE PIPE UP TO THE HORIZONTAL DIAMETER
OF THE PIPE
WHEN NATIVE MATERIAL AT THE TRENCH BOTTOM IS STONY OR OTHERWISE NON- UNIFORM, THE TRENCH SHALL BE OVER- EXCAVATED
4 INCHES BELOW THE SPECIFIED GRADE. THE CONTRACTOR SHALL THEN FURNISH AND PLACE A LAYER OF PIPE BEDDING MATERIAL
AS PROVIDED IN SECTION 9 -03.15 OF THE STANDARD SPECIFICATIONS TO THE SPECIFIED GRADE. AFTER THE PIPE IS IN PLACE,
ADDITIONAL BEDDING MATERIAL SHALL BE PLACED AND TAMPED IN PLACE AROUND THE PIPE UP TO THE HORIZONTAL DIAMETER OF
THE PIPE.
WHERE THE TRENCH BOTTOM IS IN A MATERIAL WHICH IS UNSUITABLE FOR FOUNDATION, OR MATERIAL WHICH WILL MAKE IT
DIFFICULT TO OBTAIN UNIFORM BEARING FOR THE PIPE, SUCH MATERIAL SHALL BE REMOVED AND A STABLE FOUNDATION
PROVIDED IN ACCORDANCE WITH PARAGRAPH 7- 10.3(8) OF THE STANDARD SPECIFICATIONS.
THE PORTION OF THE BACKFILL FROM TN
.E HORIZONTAL DIAMETER OF THE PIPE TO A POINT 1 FOOT ABOVE THE TOP OF THE PIPE
SHALL BE MADE WITH FINELY DIVIDED EARTH FREE FROM STONES LARGER THAN 2 INCHES IN DIAMETER. THE MATERIAL SHALL BE
CARRIED UP EVENLY ON BOTH SIDES OF THE PIPE SIMULTANEOUSLY IN APPROXIMATELY 6 -INCH LAYERS, AND EACH LAYER
THOROUGHLY COMPACTED WITH APPROPRIATE TOOLS IN SUCH MANNER AS TO AVOID INJURING OR DISTURBING THE COMPLETED
PIPELINE.
AT THE TIME OF COMPLETION OF BACKFILL AND COMPACTION, ALL TRENCH BACKFILL WITHIN KING COUNTY RIGHT -OF -WAY SHALL BE
MECHANICALLY COMPACTED TO 95% OF MAXIMUM DENSITY. ANY TRANSVERSE OPEN CUT OF ANY KING COUNTY RIGHT -OF -WAY
SHALL BE BACKFILLED ENTIRELY WITH CRUSHED SURFACING TOP COURSE, AS SPECIFIED IN SECTION 9- 03.9(3) OF THE STANDARD
SPECIFICATIONS. BACKFILL COMPACTION ON PRIVATE EASEMENTS WHICH ARE NOT USED FOR DRIVING PURPOSES SHALL BE
MECHANICALLY COMPACTED TO 90% OF MAXIMUM DENSITY.
3. COVER OVER PIPELINFS
MAINS SHALL . BE INSTALLED WITH A MINIMUM DEPTH OF COVER OF 36 INCHES FOR 8 INCH DIAMETER AND SMALLER MAINS AND 48
INCHES FOR MAINS OVER 8 INCHES IN DIAMETER. EXCEPTIONS WILL BE': ALLOWED ONLY WITH THE PRIOR APPROVAL OF THE
ENGINEER. MINIMUM SEPARATION BETWEEN OTHER UTILITIES AND OTHER WATER MAINS SHALL BE 6 INCHES WITH SAND CUSHION.
THE PORTION OF THE BACKFILL FROM THE HORIZONTAL DIAMETER OF THE PIPE TO A POINT ONE (1) FOOT ABOVE THE TOP OF THE
PIPE, SHALL BE MADE WITH FINELY DIVIDED EARTH- FREE FROM STONES LARGER THAN TWO (2) INCHES IN DIAMETER.. THE MATERIAL
SHALL BE CARRIED UP EVENLY ON BOTH SIDES OF THE PIPE SIMULTANEOUSLY IN APPROXIMATELY SIX (6) INCH LAYERS AND EACH
LAYER THOROUGHLY. COMPACTED WITH APPROPRIATE TOOLS IN SUCH MANNER AS TO AVOID INJURING OR DISTURBING THE
COMPLETED PIPELINE
INS
CONTRACTOR SHALL LEAVE EXISTING WATER UNES IN SERVICE UNTIL ACCEPTANCE OF THE NEW WATER ONES.
THE CONTRACTOR SHALL NOTIFY THE WATER DISTRICT SUPERINTENDENT AND OTHER UTILITIES AT LEAST 48. HOURS (TWO WORKING
DAYS) IN ADVANCE OF ANY CONSTRUCTION AND MAKE THE NECESSARY ARRANGEMENTS WITH THE WATER DISTRICT SUPERINTENDENT
FOR THE CONNECTION TO THE EXISTING WATER MAIN. THE CONTRACTOR SHALL NOT OPERATE ANY GATE VALVE OF THE WATER
SYSTEM BEFORE OR DURING CONSTRUCTION WITHOUT PRIOR APPROVAL OF THE WATER DISTRICT. THE WATER DISTRICT
SUPERINTENDENT MAY ELECT TO FURNISH THEMAT'ERIAL, EQUIPMENT, AND LABOR NECESSARY FOR MAKING THE CONNECTION AND
THE CONTRACTOR SHALL PAY THE WATER DISTRICT ALL COSTS FOR THE CONNECTION. IN THE EVENT THE WATER DISTRICT
SUPERINTENDENT DOES NOT ELECT TO MAKE THE CONNECTION, HE MAY AUTHORIZE THE CONTRACTOR TO FURNISH THE MATERIALS,
EQUIPMENT AND LABOR NECESSARY FOR MAKING THE CONNECTION UNDER THE.SUPERWSION OF THE.W..TER DISTRICT.
WORK SHALL NOT BE STARTED UNTIL: ALL OF THE MATERIALS, EQUIPMENT, AND LABOR NECESSARY TO PROPERLY COMPLETE WORK
ARE ASSEMBLED ON THE SITE. ONCE WORK HAS STARTED ON A CONNECTION, IT SHALL PROCEED CONTINUOUSLY WITHOUT
INTERRUPTION AND AS RAPIDLY AS POSSIBLE UPJTIL COMPLETED.
5. BLOCKING
ALL FITTINGS ARE TO BE BLOCKED WITH POURED CONCRETE AGAINST UNDISTURBED SOIL WITH SUFFICIENT CONCRETE AGAINST
UNDISTURBED SOIL WITH SUFFICIENT CONCRETE AND 3/4 -INCH ANCHOR RODS, IF REQUIRED, TO RESIST THE RESULTANT FORCES.
BLOCKING SHALL PROVIDE FOR REMOVAL. OF ANY CONNECTION TO THE FITTING. WITHOUT. DAMAGE TO THE FITTING. WHERE
UNFAVORABLE GROUND CONDITIONS ARE ENCOUNTERED, SPECIAL. BLOCKING WILL BE REQUIRED AS DIRECTED BY THE ENGINEER IN
THE FIELD. WHEN DIGGING NEAR FITTINGS OF EXISTING PIPELINES, TEMPORARY WOOD BLOCKING SHALL BE INSTALLED TO PREVENT
BLOWOUTS. SEE STANDARD DETAILS FOR THRUST BLOCKING DETAILS:
6. WATER WORKS TESTING
TESTING OF LINES SHALL BE IN ACCORDANCE WITH SECTION 7- 11.3(11) AND (12)N ACCORDING TO THE STANDARD SPECIFICATIONS.
MINIMUM TEST PRESSURE SHALL BE 250 PSI. DISINFECTION SHALL BE PER SECTION 7- 11.3(12).
7 REPAIR OF PIPELINE FAILURES
BROKEN OR OTHERWISE DEFECTIVE PIPE SHALL BE REMOVED AND REPLACED. REPAIR BANDS OR CLAMPS SHALL NOT BE USED TO
REPAIR BROKEN PIPE. -
B JACKED CROSSING
AT LOCATIONS SHOWN ON THE PLANS, WATER MAIN CROSSINGS OF ARTERIAL STREETS SHALL BE MADE BY JACKING, DRIVING, OR
AUGURING ASTFFL.CASING PIPE BENEATH THE SURFACE. STAKING. REQUEST TO THE ENGINEER SHALL BE MADE A MINIMUM. OF 5
WORKING DAYS PRIOR TO THE BEGINNING OF EXCAVATION OF THE BORE PIT. JACK CASING SHALL BELAID AT THE SPECIFIED
GRADE AND ALIGNMENT WHILE MAINTAINING CLEARANCE. IF CASING DOES NOT PROVIDE THIS IT SHALL BE ABANDONED, FILLED, AND
A NEW CASING INSTALLED TO MEET THIS LINE AND GRADE REQUIREMENT. NO OPEN. EXCAVATION SHALL BE MADE CLOSER THAN 6
FEET FROM THE EDGE OF PAVEMENT. DIAMETER OF CASING PIPE SHALL BE SUFFICIENT TO WITHSTAND. INSTA
LLA11ON FORCE AND
HIGHWAY LOADING. IT SHALL NOT BE LESS THAN 1/4 -INCH. AFTER THE WATER PIPE HAS BEEN ADJUSTED TO GRADE. MOIST SAND
SHALL BE TAMPED INTO THE CASING PIPE SO THAT ALL VOIDS WILL BE FILLED, AND THEN THE ENDS OF THE CASING SHALL BE
SEALED WITH BRICK AND MORTAR.
9. WATER SUPPLY
WATER SUPPLY FOR FILLING, TESTING, AND FLUSHING OF THE NEW MAINS WILL BE AVAILABLE FROM THE EXISTING DISTRIBUTION
SYSTEM; HOWEVER THE CONTRACTOR WILL. BE BILLED BY THE WATER DISTRICT FOR THE WATER USED AT THE RATE OF $1.50 PER
100 CUBIC FEET. THE CONTRACTOR MAY PROVIDE HIS OWN METERING FACILITIES TO THE SATISFACTION OF THE WATER DISTRICT, OR
ACCEPT THE QUANTITIES ESTIMATED BY THE WATER DISTRICT.
THE CONTRACTOR SHALL BE RESPONSIBLE FOR FLUSHING THE PIPELINE AND SHALL FURNISH ALL LABOR, EQUIPMENT, AND
MATERIALS NECESSARY TO ACCOMPLISH THE WORK. FLUSHING SHALL BE DONE UNDER THE SUPERVISION,OF WATER DISTRICT NO.
90, WHOM THE CONTRACTOR SHALL NOTIFY NOT LESS THAN 24 HOURS IN ADVANCE.
10. EXISTING UTILITIES
THE CONTRACTOR SHALL BE RESPONSIBLE FOR LOCATING ALL EXISTING UTILITIES WELL ENOUGH IN ADVANCE OF THE EXCAVATION TO
PREVENT DAMAGE DURING CONSTRUCTION. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ANY DAMAGE WHATSOEVER RESULTING
FROM HIS OPERATIONS ON THE PROJECT.
11, WARRANTY PERIOD
THE PARTY MAKING THE APPLICATION FOR A LINE EXTENSION, AND HIS CONTRACTOR, SHALL BE RESPONSIBLE FOR THE MATERIALS
AND FOR SATISFACTORY OPERATION OF THE FACILITY FOR A PERIOD OF ONE YEAR FROM THE DATE OF ACCEPTANCE OF THE
COMPLETED PROJECT AND THE BILL OF SALE TO THE DISTRICT.
N►aMt •�7 -t�ll7
ROLL # 168
NW 1/4, NW 1/4, SEC. 14, T•WP. 23 N., RGE. 5 E., W.M.
MATERIALS
1. DUCTILE IRON PIPE
PIPE SHALL BE NEW 1/16 -INCH CEMENT MORTAR -UNED, SEAL - COATED, THICKNESS CLASS 52 CONFORMING TO THE STANDARD
SPECIFICATIONS 9- 30.1(1) UNLESS NOTED ELSEWHERE ON THE PLANS. JOINTS SHALL BE PUSH -ON TYPE WITH RUBBER GASKET
WHICH FITS INTO AN ANNULAR GROOVE JOINTS AT VALVES OR FITTINGS MAY BE MECHANICAL JOINT OR FLANGED DEPENDING ON
SPECIFICATION AND DRAWING REQUIREMENT.
2. FITTINGS
FITTINGS FOR DUCTILE IRON PIPE SHALL CONFORM TO SECTION 9- 30.2(1) OF THE STANDARD SPECIFICATIONS AND MAY BE FLANGED,
MECHANICAL, OR PUSH -ON AS REQUIRED. RESTRAINED MECHANICAL JOINTS TO BE MEGA -LUG, MANUFACTURED BY EBBA IRON,
INC., OR APPROVED EQUAL FIELD -LOK GASKETS MAY BE USED IF SPECIFIED ON THE DRAWINGS OR DIRECTED BY THE ENGINEER.
3. FIRE HYDBARTS
FIRE HYDRANTS SHALL BE EITHER CLOW MEDALLION, MUELLER CENTURION 250 OR M&H 929 AND CONFORM TO THE LATEST
REVISION OF AWWA C -502, EXCEPT AS .HEREIN MODIFIED. HYDRANT SHALL HAVE A MINIMUM OF 5 1/4" MAIN VALVE OPENING, 6
WITH INCH MECHANICAL JOINT OUTLET, TWO (2). 3/4 -INCH DIAMETER TIE RODS FURNISHED 6 INCH AUXILIARY GATE VALVE FLANGED
TO MAIN TEE AND VALVE BOX; RISER TO SUIT TRENCH DEPTH AT EACH INSTALLATION. HYDRANT SHALL BE FURNISHED WITH
BREAK -OFF FLANGE ON BARREL AND BREAK -OFF COUPLING FOR THE STEM. THE HYDRANT SHALL BE FURNISHED WITH TWO (2)
2 -1/2 INCH HOSE CONNECTIONS AND ONE 4 -INCH PUMPER CONNECTION ALL WITH NATIONAL STANDARD THREADS AND OPERATING
NUTS WHICH TURN COUNTERCLOCKWISE TO OPEN; ALL ACCORDING TO WATER DISTRICT STANDARDS. NOZZLES SHALL BE FITTED
WITH RENEWABLE BRONZE NIPPLES LOCKED IN PLACE IN FIRE PROTECTION DISTRICT NO. 25, LARGER PUMPER PORT SHALL BE
4-1/2 INCH AND EQUIPPED WITH A 5-INCH STORTZ ADAPTER MEETING OR EXCEEDING THE FOLLOWING SPECIFICATIONS:
A. STORTZ ADAPTER TO BE FORGED AND /OR EXTRUDED 6061 -116 ALUMINUM ALLOY, HARDCOAT ANODIZED.
B. THREADED PORTION TO HAVE NO LUGS AND TWO SET SCREWS 180( APART.
C. STORTZ FACE TO BE METAL, NO GASKET TO WEATHER.
D. STORTZ CAP TO BE FORGER AND /OR.. EXTRUDED - 6061 -156 ALUMINUM ALLOY, HARDCOAT ANODIZED.
E. STORTZ CAP TOHAVE SYNTHETIC MOLDED RUBBER GASKET
F. STORTZ CAP TO BE ATTACHED M HYDRANT ADAPTER- WITH 1/8 -INCH COATED S.S. AIRCRAFT CABLE.
G. CAP TO BE CONNECTED AND DISCONNECTED WITH STORTZ WRENCHES ONLY. TORQUE TO u'E SUFFICIENT SO CAP
CANNOT BE REMOVED BY HAND_
H. BLUE REFLECTIVE MARKERS SHALL BE TYPE 1 AS DESCRIBED IN SECTION 9 -21.1 OF THE STANDARD SPECIFICATIONS.
IS
GUARD POSTS SHALL CONFORM TO STANDARD SPECIFICATIONS 9- 30.5(6) AND BE BURIED TO A MINIMUM DEPTH OF 3 FEET. GUARD
POSTS SHALL BE SET WITH THEIR TOPS AT THE SAME ELEVATIONS AS THE BONNET FLANGE OF THE HYDRANT. THE EXPOSED
PORTION OF THE GUARD POSTS SHALL BE PAINTED WITH TWO COATS OF EXTERIOR CONCRETE PAINT, COLOR TO BE YELLOW. TWO
GUARD POSTS SHALL: BE INSTALLED FOR EACH FIRE HYDRANT UNLESS OTHERWISE DIRECTED BY THE OWNER OR THE ENGINEER.
5. GATE VALVES
GATE VALVES SHALL BE RESILIENT WEDGE VALVE IN COMPLIANCE WITH AWWA C509 STANDARDS. VALVE END CONNECTIONS MAY BE
FLANGED, MECHANICAL JOINT OR PUSH-ON AS REQUIRED. VALVE STEM EXTENSIONS WITH PLATE WELDED TO OPERATING NUT WILL
BE REQUIRED WHERE OPERATING NUT IS MORE THAN 4 FEET BELOW SURFACE THE VALVE STEM EXTENSION TOP SHALL BE
INSTALLED WITHIN 18 INCHES TO 24 INCHES BELOW FINISH GRADE
6. WET TAPS
TAPPING SLEEVE SHALL BE JGM 412 STEEL OR ROMAC 'SST" STAINLESS STEEL SLEEVE WITH FULL COVERAGE RUBBER GASKET, OR
APPROVED EQUAL
VALVE SHALL BE A RESILIENT SEATED VALVE MADE FOR TAPPING. U.S. PIPE METROSEAL 250 OR APPROVED EQUAL. ALSO SEE
THE 8 -INCH GATE VALVE BID ITEM FOR ADDITIONAL DETAILS. SUBMITTALS REQUIRED FOR ALL MATERIALS.
7. VALVE MARKER POSTS
VALVE MARKER POSTS SHALL BE FURNISHED AND INSTALLED AS DIRECTED. MARKER POSTS. SHALL BE CONCRETE WITH 4 INCHES
MINIMUM SQUARE'. SECTION, 42 -INCH LENGTH, AND SHALL BE REINFORCED WITH ONE NO. 3 - 39' LONG REINFORCING STEEL BAR
GRADE 60. MARKERS SHALL BE PLACED AS DMECTEED BY THE ENGINEER. MARKERS SHALL BE SET SO AS TO LEAVE 18 INCHES
EXPOSED A13OVE GRADE THE EXPOSED POSITION OF THE MARKER POSTS SHALL BE PAINTED WITH TWO COATS OF EXTERIOR
CONCRETE PAINT, COLOR TO BE SAFETY YELLOW. TWO INCH HIGH LETTERS SHALL BE STENCILED WITH BLACK EXTERIOR MASONRY
PAINT ON THE FACE OF THE POST GIVING THE FOLLOWING INFORMATION: THE SIZE OF THE VALVE (E.G. 6 -INCH GATE VALVE), AND
THE DISTANCE IN FEET AND INCHES TO THE VALVE.
8. VALVE BQX
CAST IRON VALVE BOX WITH. LID- MARKED "WATER', RICH MANUFACTURING COMPANY, SERIES 940 OR AS APPROVED BY DISTRICT.
EACH BOX SHALL BE ADJUSTED TO MATCH THE FINISH GRADE AT THE VALVE LOCATION. ALL VALVE BOX COVERS SHALL BE
PAINTED AS DESIGNATED BY THE WATER DISTRICT.
ORIENT THE VALVE BOX SO THE "EARS' ARE SET THE SAME AS THE PIPE DIRECTION.
PROVIDE 4 INCH THICK BY 2 FEET WIDE ASPHALT OR CONCRETE COLLAR AROUND VALVE BOX COVERS IN UNIMPROVED AREAS,
LANDSCAPE AREAS AND EASEMENTS.
9. PIPE BEDDING MATERIAL
GRANULAR MATERIAL, COMMONLY KNOWN AS PEA GRAVEL, MEETING SECTION 9 -03.15 OF THE STANDARD SPECIFICATIONS SHALL BE
USED.
G
CRUSHED GRAVEL SURFACING SHALL CONFORM TO THE REQUIREMENTS OF SECTION 9- 03.9(3) OF THE STANDARD SPECIFICATIONS.
It. BACKFILL GRAVEL
BACKFILL GRAVEL SHALL BE MADE WITH FINELY DIVIDED EARTH FREE FROM STONES LARGER THAN TWO (2) INCHES IN DIAMETER.
12. ASPHALT CONCRETE PATCH
WHERE ASPHALT CONCRETE PATCH IS SCHEDULED, THE EXISTING SURFACE SHALL BE .CUT ON A NEAT LINE WITH A CUTTING DISC
OR SIMILAR APPROVED TOOL PRIOR TO EXCAVATION. FOLLOWING BACKFILL AND COMPACTION OF THE TRENCH, AND IMMEDIATELY
PRIOR TO RESURFACING THE EDGES OF THE SURFACING SHALL BE RETRIMMED 6 INCHES WIDER THAN THE EXCAVATION WITH
STRAIGHT VERTICAL EDGES FREE FROM .IRREGULARITIES. 1 -1/4 INCH MINUS CRUSHED GRAVEL BASE SHALL BE PLACED TO A
COMPACTED THICKNESS OF 5 INCHES. FOLLOWED BY 5/8 MINUS CRUSHED GRAVEL PLACED TO A COMPACTED THICKNESS OF 1 -1/2
INCHES. A COMPACTED MINIMUM 2 INCH THICK LIFT OF CLASS B ASPHALT CONCRETE SHALL THEN BE PLACED AND COMPACTED TO
THE GRADE OF THE ORIGINAL SURFACE. ALL ASPHALT JOINTS SHALL BE SCALED WITH APPROVED SEALER.
FOR APPROVAL
BY, ?✓
FAIT'S ,
SURFACE RESTORATION
GENERAL
ALL UNPAVED SURFACES SHALL BE RESTORED TO A CONDITION EQUAL TO THAT WHICH EXISTED FRIOR TO CONSTRUCTION. ALL
TREES, SHRUBS, AND ANY IMPROVEMENTS SHALL BE SAVED, RELOCATED, OR REPLACED BY CONTRACTOR UNLESS SPECIFICALLY
NOTED OTHERWISE ON THE DRAWINGS OR IN EASEMENT STIPULATIONS. PRE - CONSTRUCTION PHOTOGRAPHS SHALL BE USED TO
APPROVE RESTORATION.
LANDSCAPING
LANDSCAPE RESTORATION SHALL BE PERFORMED BY CONTRACTOR USING THE SERVICES OF A QUALIFIED LANDSCAPE GARDENER
WHOSE PRINCIPAL BUSINESS IS THIS TYPE OF WORK. WHERE ORNAMENTAL TREES AND SHRUBBERY ARE IN THE WORK AREA, THEY
SHALL BE CAREFULLY REMOVED WITH THE EARTH SURROUNDING THEIR ROOTS WRAPPED IN BURLAP AND REPLANTED IN THEIR
ORIGINAL POSITIONS WITHIN 4 DAYS. WORK MAY BE REQUIRED TO BE HALTED ELSEWHERE ON THE PROJECT TO ENSURE THIS WORK
IS DONE IN A TIMELY MANNER. TREE AND SHRUBBERY REMOVAL AND TRANSPLANTING WILL BE DONE ONLY BY A LANDSCAPE
GARDENER. ORNAMENTAL TREES AND SHRUBBERY MUST BE PROTECTED, BUT IF THROUGH SOME UNAVOIDABLE SITUATION SUCH
TREES. OR SHRUBBERY ARE DESTROYED OR DAMAGED, WHETHER IN PUBLIC OR PRIVATE PROPERTY, THEY SHALL BE REPLACED BY
CONTRACTOR WITH MATERIAL OF EQUAL QUALITY AND NO ADDITIONAL COMPENSATION WILL BE ALLOWED FOR SUCH REPLACEMENT.
CONTRACTOR SHALL TAKE EVERY PRECAUTION TO PROTECT EXISTING ORNAMENTAL TREES THAT ARE NOT REMOVED. PROTECTION
MAY INCLUDE TYING BACK EXISTING LIMBS WHERE NECESSARY FOR WORK ROOM. SUCH TYING BACK SHALL BE DONE CAREFULLY TO
AVOID BREAKAGE OR OTHER LIMB DAMAGE. NO LIMBS SHALL BE REMOVED OR TRIMMED WITHOUT THE WRITTEN PERMISSION OF THE
PROPERTY OWNER, WITH A COPY OF SUCH PERMISSION GIVEN TO OWNER.. IF SUCH REMOVAL OR TRIMMING IS APPROVED IN WRITING,
IT SHALL BE PERFORMED IN A PROFESSIONAL MANNER BY A QUALIFIED LANDSCAPE GARDENER.
LAWN (CULTIVATED)
IN AREAS WHERE EXISTING LAWNS ARE DISTURBED, THE LAWNS SHALL BE REPLACED WITH A MINIMUM OF 4 INCHES OF NEW TOPSOIL
AND EITHER EXISTING OR NEW SOD TO MATCH THE REMOVED SOD. RESEEDING WILL NOT BE ALLOWED.
LAWN (UNCULTIVATED PASTURE OR VACANT LAND
UNCULTIVATED LAWNS, PASTURE, AND VACANT LAND SHALL BE RESTORED WITH A PASTURE GRASS IN ADDITION TO THE
PROTECTION, RESTORATION, OR REPLACEMENT OF ANY IMPROVEMENTS OR TREES OTHERWISE CALLED FOR. DISTURBED AREAS SHALL
NOT BE LEFT UNPROTECTED FOR LONG PERIODS. TEMPORARY SEEDING, COVERING, OR OTHER PROTECTION SHALL BE USED AS
REQUIRED.
PREVIOUSLY ESTABLISHED GRADES CONFORMING TO THE REQUIREMENTS OF THE DRAWINGS SHALL BE MAINTAINED IN A TRUE AND
EVEN CONDITION. IF NECESSARY, REPAIRS SHALL BE MADE BEFORE SEEDING.
THE SURFACE TO BE SEEDED SHALL BE CLEARED OF STONES OR OTHER DEBRIS LARGER THAN 1 INCH. THE TOP 4 INCHES SHALL
BE CULTIVATED BY RAKING OR ROTOTILLING AFTER ALL COMPACTION AND PRIOR TO SEEDING. THE SURFACE SHALL BE APPROVED
BY THE ENGINEER BEFORE BEGINNING SEEDING OPERATIONS.
SEED MIX, FERBUZER, AND MULCH SHALL BE HYDROSEEDED WITH APPROPRIATE EQUIPMENT UPON APPROVAL OF THE SEED BED.
APPROPRIATE QUANTITIES OF SEED, FERTILIZER AND MULCH SHALL BE COMBINED WITH THE PROPER AMOUNTS OF WATER TO -ENSURE
THE UNIFORM COAT SPRAYED ON THE SOIL ACCOMMODATES THE FOLLOWING RATES:
SEED MIX: 40% PERENNIAL RYEGRASS 6
10% WHITE CLOVER I i•
307 FESCUE.
20% RED CREEPING FESCUE
APPLY AT THE RATE OF 100 POUNDS PER ACRE.
MULCH: SILVA -FIBER MULCH APPLIED AT FROM 1,500 POUNDS
TO 2,000 POUNDS PER ACRE.
FERTILIZER: COMMERCIAL_ MIX 10/20/20 OF NITRATE, PHOSPHATE,
AND POTASH APPLIED AT RATE OF 450 POUNDS PER ACRE.
METHOD OF APPLICATION AND PROPORTIONS OF SEED MIX MAY BE REVISED TO SUIT TYPE OF SOIL AND TIME OF YEAR, PROVIDED
PRIOR APPROVAL IS GIVEN BY ENGINEER.
CONTRACTOR SHALL PROTECT AND MAINTAIN NEWLY SEEDED AREAS. WHERE SEEDED AREAS FAIL TO DEVELOP AFTER NORMAL
ALLOWANCE FOR GERMINATION , CONTRACTOR SHALL RE -SEED.
EROSION CONTROL
CONTRACTOR SHALL EXERCISE ALL NECESSARY PRECAUTIONS THROUGHOUT THE LIFE OF THE CONTRACT TO PREVENT POLLUTION,
EROSION, SILTATION AND DAMAGE TO ANY WATER COURSES.
CONTRACTOR SHALL PREVENT SLOUGHING AND RAVELLING OF CUT SLOPES AND NATURAL SLOPES THAT ARE DISTURBED. SURFACE
RUNOFF SHALL. BE PREVENTED FROM FLOWING INTO EXCAVATIONS BY USING CURBS, BERMS, DRAINAGE DITCHES, SWALES OR OTHER
APPROVED METHODS. MANAGEMENT OF WATER PUMPED FROM EXCAVATIONS AND FLOWING FROM DISTURBED AREAS DURING
CONSTRUCTION IS THE RESPONSIBILITY OF THE CONTRACTOR.
TEMPORARY EROSION PROTECTION SHALL BE USED AND MAINTAINED DURING CONSTRUCTION TO PROTECT SLOPE SURFACES,
ADJACENT AREAS AND RECEIVING WATERS. AS TEMPORARY EROSION PROTECTION, STRAW, JUTE MATTER, VISQUEEN SHEETING OR
OTHER APPROVED FORMS OF GROUND COVER SHALL BE USED ON ALL AREAS DISTURBED BY CONSTRUCTION. SLOPED SURFACES
SHALL BE RESTORED SO THAT .SURFACE RUNOFF DOES NOT BECOME CHANNELED OR FLOW ALONG THE WATER LINE ALIGNMENT.
TO PROMOTE ..REVEGETATION,DISTURBED AREAS SHALL BE COVERED WITH 2 TO 3 INCHES OF VEGETATIVE SOIL SUCH AS THE
STRIPPED FOREST DUFF AND ORGANIC SOIL, OR IMPORTED TOPSOIL. THE VEGETATIVE SOIL SHALL BE TRACKED IN PLACE WITH THE
EQUIPMENT RUNNING PERPENDICULAR TO THE SLOPE CONTOURS SO THAT THE TRUCK GROUSER MARKS PROVIDE A TEXTURE TO
HELP RESIST EROSION. THEREAFTER, ALL DISTURBED AREAS SHALL BE HYDROSEEDED.
IN ORDER TO EFFECTIVELY CONTROL POLLUTION, EROSION, RUN -OFF AND RELATED DAMAGE, CONTRACTOR SHALL SUBMIT TO
ENGINEER FOR REVIEW AND APPROVAL AND PRIOR TO COMMENCING CONSTRUCTION A WRITTEN PLAN FOR PERFORMING ITEMS OF
TEMPORARY WORK INCLUDING BUT NOT LIMITED TO, THE FOLLOWING:
CONSTRUCTING DITCHES, SANDBAG BERMS, CULVERTS, SILT FENCES, ETC., TO CONTROL SURFACE WATER.
PROTECTING SLOPES BY COVERING OR BY OTHER MEANS UNTIL PERMANENT EROSION CONTROL MEASURES AREEFFECTIVE..-
TEMPORARY SHORING OF TRENCH EXCAVATIONS.
IN ADDITION, CONTRACTOR, AS A MINIMUM, SHALL: R�
F GROUND A CE WATERS FROM PIT SITES OR TRENCH EXCAVATIONS TO ADJACENT
NOT ALLOW DISCHARGE 0 ND /OR SURFACE �''� _
WETLANDS OR STREAMS, IF THE WATER TO BE DISCHARGED CONTAINS SILT OR OTHER FOREIGN MATERIALS.
NOT ALLOW DISCHARGES FROM PIT OR TRENCH EXCAVATIONS TO INCREASE THE EXISTING TURBIDITY OF THE 1 '
RECEIVING WATERS. GpR
O•� s
TAKE NECESSARY STEPS TO CONTROL DRAINAGE AND /OR EROSION FROM THE CONSTRUCTION AREA TO MINIMIZE-
SILT AND SEDIMENT POLLUTION OF ADJACENT WETLANDS AND STREAMS.
WHEN THE TEMPORARY CONTROL FACILITIES ARE NO LONGER NEEDED, THEY SHALL BE REMOVED AND THE AREAS •,9t.
RESTORED TO A CONDITION BETTER THAN OR EQUAL TO THEIR ORIGINAL CONDITION. ::
ftL
IN THE EVENT THAT A SUSPENSION OF WORK IS ORDERED FOR AN EXTENDED PERIOD OF TIME, CONTRACTOR SHALL
TAKE ALL ACTION NECESSARY TO CONTROL EROSION, POLLUTION AND RUN -OFF DURING THE SHUTDOWN PERIOD.
4205 148th Ave. N.E. Suite 200
WATER DISTRICT NO. 90 Bellevue, Washington 98007
'Con Fax 425.885.7963
VAI DESIGN
APPROVED
CONSTRUCTION ENGINEERING • PLANNING • SURVEYING
DRAWINGS: DATE:
Q OCT A N00 94168C631 ,