Addendum No. 3 Donner Lake Emergency Outlet … Lake Emergency Outlet Cleanout TMWA Bid No.: 2018-002 October 11, 2017 QUESTIONS, RESPONSES AND CLARIFICATION ... BLOCK SEEPAGE AT FACE
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775.834.8080 | tmwa.com | 1355 Capital Blvd. | P.O. Box 30013 | Reno, NV 89520-3013 Addendum No. 3 Donner Lake Emergency Outlet Cleanout TMWA Bid No.: 2018-002 October 11, 2017 QUESTIONS, RESPONSES AND CLARIFICATION QUESTIONS AND RESPONSES Question No. 1: Foxfire Constructors, Inc. has been in contact with Aqua-Barrier for the coffer dam to be used on the project. Their product is 18' to 20' wide and requires some friction to remain stable. They noted that the Geotechnical Report provided for the project, mentioned lose unstable soil and this will not support a water filled bladder dam. They had also mentioned that the Aqua-Barrier is not a good fit for this project. Aqua-Barrier was the coffer dam called out on Drawing C-1 for the cofferdam. Does the Owner have another option for the coffer dam to use on the project? Response to Question No. 1: A 6-foot tall backer cofferdam shall be included on the dry side of the 8-foot cofferdam for the entire length of the 8-foot cofferdam. Reference Drawing C7 with revised detail D/C7 as provided in Attachment A of this addendum. Any references in the Bid Documents to the cofferdam or 8-foot cofferdam shall be interpreted as a cofferdam system with the 8-foot primary cofferdam and a 6-foot backer cofferdam. An acceptable alternative to an Aqua-Barrier cofferdam is an AquaDam baffled cofferdam. Aqua Dam contact information: Aqua Dam, Inc. 121 Main St. / P.O. Box 144 Scotia, California USA 95565 Toll Free: (800) 682-9283 Phone: (707) 764-5099 Fax: (707) 764-2229
PROPERTY OFTRUCKEE MEADOWS WATERAUTHORITY, RETURN UPONCOMPLETION OF PROJECT
NOT REPRODUCIBLE DONNER OUTLET CLEANOUTTRUCKEE, CALIFORNIA LA
SANDR
A DENISE EDWARDS
C I V I L
STATE OF CAL I FORNIA
REG I
STER
ED PROFESSIONAL ENGINEER
No. C71029
9/21/17
BID SET
C7CIVIL DETAILS AND SITE PHOTOS
SECTION
PLAN
1
2
2
2
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NOTE 1. CONTRACTOR SHALL MATCH EXISTING CROWNS AND/OR CROSS CONTRACTOR SHALL MATCH EXISTING CROWNS AND/OR CROSS SLOPE OF EXISTING ROADWAY SECTIONS. 2. SCARIFY A MINIMUM OF 4" AND COMPACT SUBGRADE TO A SCARIFY A MINIMUM OF 4" AND COMPACT SUBGRADE TO A MINIMUM OF 95% RELATIVE COMPACTION. 3. COMPACT AGGREGATE BASE TO 95% RELATIVE COMPACTION.COMPACT AGGREGATE BASE TO 95% RELATIVE COMPACTION.
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SUBGRADE, SEE NOTE 1
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TYPE "A" BASE
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NOTE 1. CONTRACTOR SHALL REMOVE AND RESTORE FLOATING BARRIER AS CONTRACTOR SHALL REMOVE AND RESTORE FLOATING BARRIER AS REQUIRED.
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CONTRACTOR SHALL EXCAVATE AROUND, BUT NOT REMOVE OR MODIFY ROCK
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SCREEN
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16" RESTRAINED BYPASS PIPE
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SANDBAGS
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8' COFFERDAM
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AIR PURGE FITTING
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PLASTIC LINED SUMP INSTALLED IF NECESSARY TO CONTAIN LEAKAGE AT BYPASS PIPE
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SANDBAGS ADD MULTIPLE LAYERS AS NEEDED TO CONTAIN WATER
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SUMP PUMP, SIZE AS REQUIRED
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PUMP AND PIPE SIZE AS REQUIRED
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24/7 900 GPM (MIN) BYPASS PUMP AND PIPING SYSTEM SEE NOTE 1
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SCREEN W/1" MAX OPENINGS
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16" RESTRAINED ISOLATION VALVE; TYPE BY CONTRACTOR
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PUMP 900 GPM MIN. TEMPORARY BYPASS PUMP BY CONTRACTOR
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APROX FIRM SOIL ELEV: 5924 ± 1'
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MUD LINE ELEV: 5925.5
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TO DOWNSTREAM OF DAM
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NOTE: 1. DISCHARGE DOWNSTREAM OF DAM. DISCHARGE DOWNSTREAM OF DAM. PIPING SHALL RUN WITHIN CHANNEL EMBANKMENTS AND/OR ALONG EXISTING DISTURBED PATHS. PIPING MAY BE COMBINED WITH DEWATERING PIPING. 2. CONTRACTOR TO ROUTE BYPASS CONTRACTOR TO ROUTE BYPASS PIPING AS NEEDED. 3. CONTRACTOR SHALL LOCATE CONTRACTOR SHALL LOCATE COFFERDAMS IN RELATION TO PROPOSED CHANNEL AS NEEDED TO GRADE CHANNEL PER SHEET C5C5
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ELEV: 5926
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ELEV: 5927 TO 5929.5
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8' COFFERDAM
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ELEV: 5932 ±
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16" ELBOW
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BLOCK SEEPAGE AT FACE OF COFFERDAM
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SANDBAGS OR SECONDARY COFFERDAM BLADDER PER COFFERDAM MFR. RECOMMENDATIONS TO SEAL AROUND PIPE UNDER COFFERDAM
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2" VALVE AND SADDLE TO CONNECT AIR PURGE TO CLEAN SCREEN
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BASE BID
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BYPASS PIPING BID ITEM
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16" RESTRAINED BYPASS PIPE
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TEMPORARY ABOVE-GROUND BYPASS PIPING; SIZE, TYPE, AND CONFIGURATION BY CONTRACTOR
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TEMPORARY ABOVE-GROUND BYPASS PIPING; SIZE, TYPE, AND CONFIGURATION BY CONTRACTOR
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6' BACKER COFFERDAM ENTIRE LENGTH
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6' BACKER COFFERDAM ENTIRE LENGTH
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NOTES 1. ACCESS RAMPS SHALL CONSIST OF FURNISHING, INSTALLING AND ACCESS RAMPS SHALL CONSIST OF FURNISHING, INSTALLING AND REMOVING MATERIALS TO CONSTRUCT TEMPORARY ACCESS AS SHOWN ON THE PLANS. MATERIALS THAT ARE REQUIRED INCLUDE GEOTEXTILE FABRIC AND EARTH FILL. 2. FILL SHALL BE CLEAN AND FREE FROM ORGANIC MATTER AND FILL SHALL BE CLEAN AND FREE FROM ORGANIC MATTER AND OTHER DELETERIOUS SUBSTANCES. 3. A GEOTEXTILE FABRIC SHALL BE PLACED AS A SOIL SEPARATING A GEOTEXTILE FABRIC SHALL BE PLACED AS A SOIL SEPARATING BARRIER BETWEEN THE EXISTING GROUND SURFACE AND ALL SOIL MATERIAL PLACED TO CONSTRUCT THE TEMPORARY ACCESS RAMP. 4. AFTER THESE RAMPS ARE NO LONGER NEEDED, ALL SOIL.MATERIAL AFTER THESE RAMPS ARE NO LONGER NEEDED, ALL SOIL.MATERIAL AND FABRIC SHALL BE REMOVED IN A MANNER THAT PREVENTS SOIL SPILLAGE ONTO THE EXISTING GROUND SURFACE.
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GEOTEXTILE FABRIC
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NOTES 1. WITHIN THE PARK BOUNDARY, TEMPORARY ACCESS PROTECTION WITHIN THE PARK BOUNDARY, TEMPORARY ACCESS PROTECTION SHALL BE INSTALLED AT ALL UNPAVED VEHICLE ACCESS ROUTES AND PIPE ACCESS ROUTES THAT ARE OUTSIDE OF THE DESIGNATED LIMITS OF DISTURBANCE AS SHOWN ON THE PLANS, UNLESS OTHERWISE SPECIFICALLY EXCLUDED. 2. THE UNPAVED “FIRE ACCESS” ROAD TO THE BOULDER STAGING THE UNPAVED “FIRE ACCESS” ROAD TO THE BOULDER STAGING FIRE ACCESS” ROAD TO THE BOULDER STAGING ROAD TO THE BOULDER STAGING AREA DOES NOT REQUIRE PROTECTION PER THIS DETAIL. 3. WIDTH OF PROTECTION MAT SHALL BE AS REQUIRED TO PREVENT WIDTH OF PROTECTION MAT SHALL BE AS REQUIRED TO PREVENT VEHICLES FROM TRAVELING ON UNPAVED SURFACES OUTSIDE OF LIMITS OF DISTURBANCE. 4. PROTECTION SHALL BE PROVIDED UNDER ALL PIPING INSTALLED PROTECTION SHALL BE PROVIDED UNDER ALL PIPING INSTALLED ON UNPAVED SURFACES OUTSIDE OF THE LIMITS OF DISTURBANCE. 5. TEMPORARY PROTECTION MATS SHALL BE DURADECK, GEOTERRA, TEMPORARY PROTECTION MATS SHALL BE DURADECK, GEOTERRA, SOLIDGROUND TRACTION MATS, OR EQUAL. 6. PROTECTION SYSTEM SHALL BE INSTALLED AND REMOVED WITHOUT PROTECTION SYSTEM SHALL BE INSTALLED AND REMOVED WITHOUT DISTURBING THE EXISTING GROUND. 7. A GEOTEXTILE FABRIC SHALL BE PLACED AS A SOIL SEPARATING A GEOTEXTILE FABRIC SHALL BE PLACED AS A SOIL SEPARATING BARRIER BETWEEN THE EXISTING GROUND SURFACE AND THE PROTECTION MAT.
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VARIES
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VARIES
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TEMPORARY MAT PROTECTION
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AA GEOTEXTILE FABRIC
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EXISTING GROUND
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RECOMMENDED
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SUBMITTED
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APPROVED
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SHEET NUMBER
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OF
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REVISION
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DESCRIPTION
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BY
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APP
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DATE
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DRAWN
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WORK ORDER NO.
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DESIGNED
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DATE
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CHECKED
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PH 775-834-8000 / FX 775-834-8003
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RENO, NEVADA 89520-3013
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1355 CAPITAL BLVD. / PO BOX 30013
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TMWA - 2018-002
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PATH: \\BCSACFP01\PROJECTS\51000\151083 - DONNER LAKE DREDGING PROJECT _TMWA\CADD\2-SHEETS\C-CIVIL FILE: 2018-002_C7-CIVIL DETAILS AND SITE PHOTOS.DWG \\BCSACFP01\PROJECTS\51000\151083 - DONNER LAKE DREDGING PROJECT _TMWA\CADD\2-SHEETS\C-CIVIL FILE: 2018-002_C7-CIVIL DETAILS AND SITE PHOTOS.DWG FILE: 2018-002_C7-CIVIL DETAILS AND SITE PHOTOS.DWG 2018-002_C7-CIVIL DETAILS AND SITE PHOTOS.DWG October 11, 2017 - 2:31 PM, Cadd User: Larry Bullock - 2:31 PM, Cadd User: Larry Bullock2:31 PM, Cadd User: Larry Bullock, Cadd User: Larry BullockLarry Bullock
