The URL can be used to link to this page

Home My WebLink AboutRD-243-14a a Y r PARTING LOT �< \ v 1 BIT CURB 1211.25%. INSTALL TEMPORARY EROSION <4\ CONTROLS (SEE DETAILS) 2 J \ \\ 210. �J F i TEMPORARY COFFER DAM I (SHEET PILES, STEEL PLATES, JERSEY BARRIERS AND SAND BAGS, PROPRIETARY SYSTEM, OR APPROVED AL TERNA TI VE) - - - -- 213-- - ----------------- - x11.88 - X211.55 BOTTOM OF BANK '�? M INSTALL TEMPORARY COFFER DAM PRIOR \ :6x I x!11 �� TO INSTALLING TEMPORARY BYPASS PIPING APPROXIMATE R.O.W. _ _ _ _ _ INSTALL TEMPORARY BYPASS PIPING (78" MIN. HDPE OR APPROVED AL TERNA TI VE) \ - TEMPORAR Y DEWA TERING I �� ✓ - w� _. _ _ = _ w - w- - `o (FRAC) TANK AND EQUIPMENT -216 c �; W-A2 z1o�o flWF- - A3_- --------------- - - -__ 273------------- z- - -- - - - -- -- - - - - -- - -- -- 214 -- ---------- ' - - - - - - ----- - - - - -- ___ z -------------------- - - - -- ----- - - - - -- - -- 217 -------- - - - - ---216 __ �F A. - A1 ----- - - - - -- ---- -crx.- iITA -- 1J7J°MMzS' 77vv Tr( i - - D ^ - _ - - - WOODEN GU,4PD RAIL MV - m / / VVOODE N GUARD RAIL r' ✓1 UL Cr-f rwwrYl'1" �- 78"' TWIN -- �cPG � G INSTALL COMPOST SOCK SLOPE \moo STABILIZATION ALONG ALL AREAS OF _214-' -- '� \ DISTURBED STREAMBANK (SEE DETAILS) ' --21 JCBD TEMPORARY WELL POINT USED TO CONTROL GROUNDWATER ELEVATION N/F JAMES O'CONOR 73 HANCOCK AVE MAP 56 LOT 31 / / M E_ /JG'- OF PA' ✓� 11[-N i- ICR�II`vE �1 Y ��.9_.J� �9J \ - C =D(;. OF rAv-1 - - - - -- ,\ - -_ --------------------------- 217- -- -D 1� '_.-. LIJ�F ' - - -21 - - - -- - Y, �n,w MO° RCP-=--- - - - - -- - - - - - ----- - - - - -- Xo _ -- ---- =-.13- I f WF- D3 i\ \ X \, k'1F -C�\ 211.29�� \\ \� v ✓ w X \\ MWRA SMH i RIM EL. = 214.78 `oGf \\x �= 206.58 _ - - - - WFyc3 \ `\\ \\ ADDITIONAL TEMPORARY COFFERDAM W �\ 211.00 \ OR SIL TA TION BOOM (AS NEEDED) TO X \ \ \ry PREVENT BACKWATER AND PREVENT NI DOWNSTREAM SIL TA TION BOTTOM OF \� \ \\ z o \o_ m C rn N D rn C) o \ WAY Z\ I O C- 0 t APPROXIMA TE R. 0. W. I BANK y\ X\ NIF WF -C4) \ \�� X210.8 �Q,h TOWN OF LEXINGTON �M \ \ ` BEDFORD STREET MAP 56 LOT 30 THE FOLLOWING SEQUENCE IS PROVIDED FOR GUIDANCE TO THE CONTRACTOR FOR COMPLYING WITH ENVIRONMENTAL REQUIREMENTS. THE CONTRACTOR REMAINS RESPONSIBILE FOR MEANS AND METHODS OF CONSTRUCTION, AND CAN REASONABLY MODIFY THIS SEQUENCE, CONSISTENT WITH ALL APPLICABLE PERMIT REQUIREMENTS, 1. CULVERT REPLACEMENT AND ADJACENT STREAMBANK STABILIZATION WORK SHALL COMMENCE AFTER JULY 1ST AND BE COMPLETED 12. EXCAVATE THE BIKEWAY TO PREPARE FOR PLACEMENT OF THE NEW CULVERT, REMOVE THE EXISTING CULVERT AND STONE WINGWALLS, PRIOR TO OCTOBER 1ST. AND COMPLETE EXCAVATION AND FOUNDATION PREPARATION FOR THE NEW CULVERT. THE AREA OF DISTURBANCE SHALL BE KEPT TO A MINIMUM. 2. PLACEMENT OF TEMPORARY TRAFFIC CONTROL DEVICES TO CLOSE DOWN THE USE OF THE BIKEWAY. TEMPORARY TRAFFIC SIGNAGE SHALL BE USED TO SET UP A BIKEWAY DETOUR. 13. STARTING AT THE END AS DIRECTED BY THE SHOP DRAWINGS, INSTALL THE CULVERT CUTOFF WALLS AND WINGWALL FOOTINGS. 3. PERFORM BIKEWAY ALTERATIONS SUFFICIENT FOR EQUIPMENT ACCESS FOR CULVERT RECONSTRUCTION. 14. INSTALL THE NEW CULVERT SECTIONS AND WINGWALLS ON TOP OF CUTOFF WALLS, FOOTINGS, AND PREPARED BASE. 4. TEMPORARY EROSION CONTROLS, COFFER DAMS, AND BYPASS PIPING (OR APPROVED ALTERNATIVE BYPASS) SHALL BE USED TO 15. IT IS AT THE CONTRACTORS DISCRETION WHETHER TO FILL CULVERT SECTIONS WITH DESIGNED STREAM BED MATERIAL AS WORK MAINTAIN NATURAL FLOWS IN THE STREAMBED IMMEDIATELY UPSTREAM AND DOWNSTREAM OF THE WORK AREA, AND TO PREVENT PROGRESSES OR AS A FINAL STEP. AS NOTED ON THE DETAIL SHEETS: THE USE OF A SEPARATE TOP SLAB OPTION OR ACCESS SEDIMENT DISCHARGE TO STREAM, IN ACCORDANCE WITH PERMIT CONDITIONS. MANHOLES OPTION IS AT THE DISCRETION OF THE CONTRACTOR. A CONTINUOUS BOX CULVERT, TOP SLAB OPTION, OR SEALABLE ACCESS MANHOLES, MEETING ALL REQUIRED SPECIFICATIONS MAY BE USED UPON ACCEPTANCE BY THE ENGINEER. 5. INSTALL TEMPORARY BYPASS PIPING, OUTSIDE THE LIMITS. OF NEW CULVERT STRUCTURE, IN THE GENERAL LOCATION SHOWN IN THE EXISTING EDGE OF PAVEMENT PLAN VIEW, AS REQUIRED BY FIELD CONDITIONS. INSTALLATION OF THE TEMPORARY BYPASS PIPING SHALL BEGIN FROM THE DOWNSTREAM 16. GRADE STREAMBED MATERIAL WITHIN BOX CULVERT AS DEPICTED ON PLANS. THE FULL CONSTRUCTION OF THE DESIGNED STREAMBED END. DO NOT ACTIVATE BYPASS PIPING UNTIL BIKEWAY DETOUR PREPARATIONS ARE COMPLETE. MATERIAL AND STREAMBANKS WITHIN THE CULVERT MUST BE COMPLETED AS SPECIFIED ON THE PLANS. 6. A TEMPORARY COFFERDAM SHALL BE INSTALLED AROUND THE UPSTREAM END OF THE TEMPORARY BYPASS PIPING PRIOR TO PUTTING OPTIONAL CONSTRUCTION METHOD: INSTALL THE TOP SLAB PORTION OF THE BOX CULVERT OR SEALABLE ACCESS MANHOLE COVERS AND HEADWALLS AND SECURE AS SPECIFIED BY THE MANUFACTURER. THE TEMPORARY BYPASS PIPING INTO USE. PROPOSED EDGE OF PAVEMENT 17. COMPLETE BACKFILLING OF CULVERT STRUCTURE. 7. THE UPSTREAM WATER LEVEL OF THE STREAM SHALL BE GRADUALLY LOWERED THROUGH THE USE OF TEMPORARY BYPASS PIPING, EXISTNG DRAIN UNE PUMPING, OR OTHER APPROVED MEANS, AS TO AVOID LARGE VOLUMES OF WATER AND EROSIVE VELOCITIES TO DISCHARGE DOWNSTREAM. 18. INSTALL COMPOST SOCK SLOPE STABILIZATION ALONG ALL AREAS OF DISTURBED STREAMBANK, SHAPE STREAMBANKS TO BLEND WITH BED MATERIAL IN THE CULVERT. 8. THE UPSTREAM COFFERDAM SHALL BE INSTALLED TO CONTROL SURFACE WATER ACTION AND MAINTAIN ANY NECESSARY WORK IN THE EXISTNG UTILITY POLE DRY. 19. REMOVE TEMPORARY BYPASS PIPING, STABILIZE AND REESTABLISH STREAM BANK WHERE TEMPORARY PIPE WAS IN USE. 9. CULVERT STRUCTURE PLACEMENT SHALL BE CONDUCTED DURING LOW FLOW CONDITIONS AT A TIME WHEN NO RAIN IS PREDICTED FOR 20. REMAINING COFFER DAM SHALL BE REMOVED IN CONJUNCTION WITH THESE ACTIVITIES. IN ALL CASES OF COFFERDAM REMOVAL THE THE ANTICIPATED TIME REQUIRED FOR INSTALLATION. RELEASE OF FLOWS SHALL BE GRADUAL AS TO AVOID LARGE VOLUMES OF WATER AND EROSIVE VELOCITIES TO DISCHARGE DOWNSTREAM. 10. ADJUST EROSION CONTROLS AS REQUIRED TO PROTECT STREAM AND WETLANDS FROM SEDIMENT RESULTING FROM CONSTRUCTION 21. CONSTRUCT REMAINING BIKEWAY IMPROVEMENTS AND REINSTALL WOODEN GUARDRAIL. ACTIVITY. EXISTING STONE WALL XRE -'a 1 22. REMOVE ALL TEMPORARY TRAFFIC CONTROL DEVICES AND OPEN ROADWAY TO TRAFFIC. 11. INSTALL DEWATERING .EQUIPMENT IN PREPARATION FOR COMPLETE EXCAVATION. A bEWATERING FRAC TANK WITH SEDIMENTATION FILTRATION BAG SHALL BE USED PRIOR TO DISCHARGE. 23. REMOVE REMAINING EROSION CONTROLS WHEN ALL SURFACES HAVE BEEN STABILIZED. MINUTEMAN D SCALE 1 = 10' LEGEND: APPROX. ROW EXISTING SURVEY MARKER APPROXIMATE RIGHT -OF -WAY 170 EXISTING W CONTOUR -IF APPROXIMATE PROPERTY UNE EOP EXISTING I' CONTOUR EXISTING EDGE OF PAVEMENT EOP -170- - PROPOSED 5' CONTOUR PROPOSED EDGE OF PAVEMENT -D EXISTNG DRAIN UNE - -160- - PROPOSED V CONTOUR PROPOSED CULVERT T EXISTNG UTILITY POLE EXISTING GUARD RAIL i'N EXI57NG SIM -a -.s PROPOSED GUARD RAIL ,° 12• EXISTING TREE W/IRUNK DIAMETER EXISTING STONE WALL XRE -'a 1 EXISTING WET-AND FAG COFFER DAM EROSION CONTROLS 0 SHEET PILES LIMIT OF WORK A- ci&3i JERSEY BARRIER - - - - APPROX. PROPERTY LINE 10 5 0 10 20 Scale V =10` P.E. STAMP GENERAL NOTES 1. DRAWINGS BASED ON TOPOGRAPHIC SURVEY CONDUCTED ON JULY 28, 2014, AUGUST 14, 2014 & SEPTEMBER 3, 2014 BY GCG ASSOCIATES, INC. ELEVATIONS SHOWN HEREON ARE REFERENCED TO THE NAVD 1988 DATUM. 2. WETLAND DELINEATION PERFORMED ON JUNE 25, 2014 BY COMPREHENSIVE ENVIRONMENTAL, INC. 3. STREET LINES AND PROPERTY LINES ARE BASED ON SURVEY CONDUCTED ON JULY 28, 2014 BY GCG ASSOCIATES, INC. 4. ROADWAYS AND DRAINAGE STRUCTURE LOCATIONS DEPICTED ON THIS MAP ARE APPROXIMATE AND MUST BE VERIFIED BY THE CONTRACTOR. THE LOCATION AND DEPTH OF DRAINAGE PIPES SHOWN ON THESE PLANS ARE APPROXIMATE AND SHALL BE VERIFIED BY THE CONTRACTOR PRIOR TO CONSTRUCTION. 5. THE CONTRACTOR SHALL EXERCISE EXTREME CAUTION TO PREVENT ANY DAMAGE TO ADJACENT PROPERTIES. ALL AREAS WHICH ARE AFFECTED BY THE CONTRACTOR'S OPERATIONS SHALL BE RETURNED TO THEIR ORIGINAL CONDITION OR BETTER, AT NO ADDITIONAL COST TO THE OWNER. 6. ANY CHANGE IN FIELD CONDITIONS SHALL BE REPORTED TO THE ENGINEER TO INSURE THAT ANY MODIFICATIONS TO THE ORIGINAL DESIGN ARE PROPER AND ADEQUATE TO SERVE THE PROJECT'S NEEDS AND COMPLY WITH THE: APPLICABLE STANDARDS AND REGULATIONS. 7. CONTRACTOR SHALL IMMEDIATELY REPAIR OR FILL ANY POTHOLES THAT OCCUR DUE TO CONSTRUCTION. No.' Revision /Issue I Date COMPREHENSIVE ENVIRONMENTAL INCORPORATED 225 CEDAR HILL ST. MARLBOROUGH, MA 01752 MINUTEMAN BIKEWAY N. LEXINGTON BROOK CULVERT REPLACEMENT WATER MANAGEMENT AND EROSION CONTRRL PLAN Town of Lexington, MA Project No.: 228 -5 Sheet Dote: FEBRUARY 2015 Drawn By: E CJ 2 Checked By: : M LL Scale: 1" = 10' -3 RECORD PRARN De-24-�