SOW Drawing 1.pdf

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CB CONC

STRUCTURE

RIM=361.13

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DISTRIBUTION

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US Army Corps of Engineers

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BENCHMARK DATA DATUM=NAVD88

BM ELEVATION DESCRIPTION

TBM-2 362.01 ACOE DISK AT EDGE OF PAVEMENT

CONTROL POINT TABLE

2 905874.5612 1230572.700 362.01 DISK WEST SIGHT RED

3 905952.5351 1230461.993 362.28 MON 3

4 906064.1319 1230353.426 362.71 MON 4

5 905856.6563 1230419.893 371.86 MON 5

PNT# NORTHING EASTING ELEV. DESCRIPTION

Feet

1:240

40200

DESIGN DATA

20 GPD/EMPLOYEE (OFFICE BUILDING)

10 EMPLOYEES

200 GPD

1,000 GAL.

250 SF

DESIGN FLOW _____________________________________________

# OF SEATS ________________________________________________

DAILY FLOW _______________________________________________

SEPTIC TANK USED __________________________________________

LEACH AREA USED __________________________________________

NO GARBAGE DISPOSALS ALLOWED

RECEIVING SOIL DEPTH >60", M.L.S.S. NOT REQUIRED

INVERT DATA

PIPE INVERT AT BUILDING FOUNDATION________________________

SEPTIC TANK IN ____________________________________________

SEPTIC TANK OUT __________________________________________

DISTR. BOX IN _____________________________________________

DISTR. BOX OUT ___________________________________________

INLET OF LEACHING CHAMBERS _______________________________

BOTTOM OF LEACHING CHAMBERS ____________________________

EST. SEASONAL HIGH GROUNDWATER (E.S.H.W.T.) ________________

358.20

357.36

357.11

355.14

354.97

354.92

354.25

352.25

SOIL LOG

DATE OF TESTS _____________________________________________

PRESENT AT TESTS __________________________________________

PERCOLATION RATE _________________________________________

10/28/2020

M. GODFREY, B. SPRAGUE

1.7 MIN./INCH

TP # DH-1 (ELEV. ±356.8)

0"-38" FILL ---- ------------- ------------- -------------

38"-86" C LS 10YR 4/6 MASSIVE FRIABLE

MOTTLES AT 45"

NO LEDGE

TP # DH-2 (ELEV. ±355.9)

0"-41" FILL ---- ------------- ------------- -------------

41"-86" C LS 10YR 4/6 MASSIVE FRIABLE

MOTTLES AT 44"

NO LEDGE

DESIGN CALCULATIONS

DESIGN FLOW = 20 GPD/EMPLOYEE (COMMERCIAL BUILDINGS - OFFICE)

DESIGN PERC RATE = 1 TO 10 MIN./IN

DAILY FLOW = (20 GPD/EMP) x (10 EMP) = 200 GPD; USE 200 GPD MIN.

ALLOWABLE LOADING = 0.8 GPD/SF

REQUIRED LEACHING AREA = (200 GPD)/(0.8 GPD/SF) = 250 SF

EFFECTIVE LEACHING AREA IN TRENCH CONFIGURATION = 3.6 SF/LF

EFFECTIVE LEACHING AREA = (250 SF)/(3.6 SF/LF) = 69.4 LF, USE 70 LF

SIZE OF TRENCHES NEEDED = FOR 2 TRENCHES, (70 LF)/(2 TRENCHES) = 36 LF/TRENCH;

4'-CHAMBERS INTERVALS NEEDED, USE 2 TRENCHES AT 36' EACH

4. THE CONTRACTOR SHALL VERIFY THAT ACTUAL SITE CONDITIONS ARE CONSISTENT WITH THE EXISTING

CONDITIONS DEPICTED ON THE CONTRACT DRAWINGS. DISCREPANCIES, OMISSIONS, AND ERRORS SHALL

BE REPORTED TO THE GOVERNMENT PRIOR TO THE START OF CONSTRUCTION.

5. LOCATIONS OF UNDERGROUND UTILITIES SHOWN ARE APPROXIMATE ONLY AND NOT ALL UNDERGROUND

UTILITIES MAY BE SHOWN. THE CONTRACTOR SHALL PROTECT ALL UNDERGROUND UTILITIES FROM DAMAGE

THROUGHOUT THE DURATION OF CONSTRUCTION AND BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES.

6. THE CONTRACTOR SHALL CALL DIG SAFE AT 811 OR 1-888-DIG-SAFE NOT LESS THAN 72 HOURS PRIOR TO THE

START OF ANY EXCAVATION FOR VERIFICATION OF UNDERGROUND UTILITY LOCATIONS.

7. EXISTING BUILDING IS SERVICED BY A LOCAL SITE (PRIVATE) WELL.

8. NO PORTION OF THE PROPOSED SYSTEM IS LOCATED WITHIN 100' OF WETLANDS.

9. THE CONTRACTOR SHALL PUMP DRY THE EXISTING SEPTIC TANK AND DISTRIBUTION BOX (D-BOX) AND ABANDONED IN PLACE OR COMPLETELY REMOVED FROM THE SITE IN ACCORDANCE WITH SECTION II, SUBPART D OF THE CONNECTICUT

PUBLIC HEALTH CODE, JANUARY 2018.

10. IF ANY PORTION OF THE EXISTING SEPTIC TANK OR LEACH PIT ARE LOCATED WITHIN THE FOOTPRINT OF THE NEW TRENCHES, THE CONTRACTOR SHALL COMPLETELY REMOVE THEM AND BACKFILL WITH CLEAN SAND.

11. EXISTING MANHOLE FRAMES, COVERS, AND RISERS (AS NOTED) SHALL BE REMOVED AND DISPOSED OF OFFSITE.

12. CONTRACTOR SHALL STRIP AND REINSTALL TOP SOIL AND RESEED IN ALL DISTURBED AREAS AND GRADED AREAS SHALL BE LOAMED, SEEDED, AND MAINTAINED TO PREVENT EROSION. SEED WITH TURF SEED MIX SPECIFIED BELOW WITH 6" REQUIRED DEPTH OF LOAM: THE TURF SEED MIX SHALL BE COMPRISED OF 30% KENTUCKY BLUEGRASS (Poa Pratenses, "Kenblue" variety), 30% CREEPING RED FESCUE (Festuca rubra, "Boreal" variety), 30% PERENNIAL RYEGRASS (Lolium perenne) and 10%

DUTCH WHITE CLOVER. APPLY 5 LBS OF THIS SPECIFIED TURF SEED MIX PER 1,000 SF.

13. BOTTOM AND SIDES OF TRENCH EXCAVATION ARE TO BE RAKED (SCARIFIED) BEFORE INSTALLATION OF LEACHING CHAMBERS. ALL STONES EXCEEDING 2 INCHES IN DIAMETER, ALL LOAM, OR FOREIGN MATERIAL ENCOUNTERED DURING

EXCAVATION ARE TO BE REMOVED FROM THE LEACHING AREA TRENCH SURFACE.

14. FINISHED SURFACE ABOVE THE LEACHING AREA SHALL BE GRADED TO ASSURE WATER RUNOFF (2% MINIMUM SLOPE).

15. THE SEPTIC TANK SHALL BE A MONOLITHIC PRECAST CONCRETE STRUCTURE WITH INLET AND OUTLET WITH 4"

PVC SCH 40 BAFFLE TEES. THE TANK SHALL BE WATERTIGHT AND RATED FOR H-20 LOADING. INLET AND OUTLET

OPENINGS SHALL BE PROVIDED WITH BOOT FITTINGS TO ENSURE WATERTIGHT PIPE INSTALLATION. TANK, PIPE

OPENINGS, AND RISERS SHALL BE TESTED FOR WATERTIGHTNESS. SEPTIC TANK CONSTRUCTION AND MATERIALS

SHALL COMPLY WITH SECTION V OF THE CONNECTICUT PUBLIC HEALTH CODE, JANUARY 2018.

16. SEPTIC TANK SHALL HAVE TWO WATER TIGHT CONCRETE MANHOLE RISER TO GRADE, WITH CAST IRON FRAME AND SECURED COVER (NEENAH R-1916-F, OR APPROVED EQUAL) TO PREVENT UNAUTHORIZED ACCESS.

17. CONTRACTOR SHALL USE EXCAVATED MATERIAL FOR BACKFILL TO THE MAXIMUM EXTENT POSSIBLE. ANY IMPORTED FILL SHALL BE SELECT FILL MEETING THE REQUIREMENTS OF SECTION VIII, SUBPART A OF THE CONNECTICUT PUBLIC HEALTH CODE

AND TECHNICAL STANDARDS, JANUARY 2018.

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

BENCHMARK

SOIL TEST LOCATION

PERC. TEST LOCATION

EXISTING BITUMINOUS CONCRETE

PROPOSED SEWER LINE

EXISTING VEGETATION

EXISTING MANHOLE

NEW MANHOLES

LEGEND

PROPOSED CONTOUR

SITE PLAN

OBSERVATION PORT (TYP)

(ONE PER TRENCH)

CHAMBER END CAP (TYP)

36 LF LEACHING TRENCH

9 CHAMBERS PER TRENCH

(TYP OF 2)

NEW D-BOX

INSTALL

4" CLEANOUT

TO GRADE

NEW 1000 GAL.

SEPTIC TANK

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TIE INTO EXISTING 6" CI BUILDING

SEWER AT FOUNDATION WALL WITH

4" CI-TO-PVC FLEXIBLE RUBBER COUPLING

100' WELL OFFSET

REMOVE MANHOLE FRAME AND COVERS, AND

ABANDON EXISTING SEPTIC TANK IN PLACE

(SEE NOTE 9, THIS SHEET)

REMOVE MANHOLE FRAME AND COVERS, AND

ABANDON EXISTING D-BOX IN PLACE

(SEE NOTE 9, THIS SHEET)

EXISTING LEACH FIELD TO

REMAIN IN PLACE

SEPTIC SYSTEM CONSTRUCTION NOTES

SCALE: 1" = 20'

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% 4

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4" DIA PVC SCH 40 PIPE

S = 0.05%

EXSTING SEWER LINE

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SS

50' WELL OFFSET

CONNECT ENDS WITH 4" SCH 40

PVC PIPE (USE TOP PORTS)

18. ALL CONSTRUCTION AND MATERIALS SHALL BE IN ACCORDANCE WITH THE CONNECTICUT PUBLIC HEALTH CODE AND TECHNICAL STANDARDS, JANUARY 2018. STONE AGGREGATE, SELECT FILL, AND NON-WOVEN FILTER FABRIC SHALL MEET THE REQUIREMENTS OF SECTION VIII, SUBPART A OF THE CONNECTICUT PUBLIC HEALTH CODE, JANUARY 2018.

19. A CONNECTICUT LICENSED PROFESSIONAL SURVEYOR SHALL FIELD STAKE THE NEW SEPTIC SYSTEM AND SHALL SET A STABLE TEMPORARY

BENCHMARK (NAVD88) AS MAY BE NEEDED BY THE CONTRACTOR.

20. ALL WORK SHALL BE PERFORMED BY A CONNECTICUT LICENSED SEPTIC SYSTEM INSTALLER. THE LICENSED INSTALLER SHALL BE ONSITE AT ALL

TIMES DURING CONSTRUCTION.

21. AT LEAST 48 HOURS PRIOR TO REQUESTING A FINAL INSPECTION THE INSTALLER SHALL PREPARE AND PROVIDE THE GOVERNMENT WITH A PRELIMINARY

SKETCH (BY HAND OR CAD) SHOWING THE FINAL LAYOUT, ELEVATIONS, PIPE LENGTHS, AND INVERTS FOR THE COMPLETED SEPTIC SYSTEM. IF PRELIMINARY

SKETCH IS APPROVED, A FINAL INSPECTION BY THE GOVERNMENT WILL BE ARRANGED WITH THE INSTALLER WITHIN 24 HOURS OF PRELIMINARY SKETCH

APPROVAL. THE SYSTEM SHALL NOT BE BACKFILLED WITHOUT WRITTEN APPROVAL FROM THE GOVERNMENT.

22. WITHIN 7 DAYS FROM THE DATE OF THE FINAL INSPECTION, THE CONTRACTOR SHALL SUBMIT TO THE GOVERNMENT AS-BUILT DRAWING(S) THAT HAS BEEN PREPARED AND STAMPED BY A CONNECTICUT LICENSED PROFESSIONAL LAND SURVEYOR (PLS). THE CONTRACTOR SHALL ALSO SUBMIT TO THE GOVERNMENT THE ELECTRONIC CAD FILES FOR THE AS-BUILT DRAWING(S). THE CAD DRAWING FILES SHALL BE PREPARED IN AUTOCAD RELEASE 2018. THE AS-BUILT DRAWING(S) SHALL SHOW COMPLETE HORIZONTAL AND VERTICAL LOCATIONS OF ALL SYSTEM COMPONENTS FOR THE COMPLETED SEPTIC SYSTEM, BOTH ABOVE AND BELOW GRADE, INCLUDING RIM AND INVERT ELEVATIONS. THE

AS-BUILT DRAWING(S) SHALL ALSO SHOW FINAL GRADES OVER THE ENTIRE SYSTEM.

23. THE LEACHING AREA SHALL BE COVERED BY THE LICENSED INSTALLER WITHIN TWO WORKING DAYS FOLLOWING GOVERNMENT INSPECTION AND APPROVAL.

24. CONTRACTOR TO INSTALL MAGNETIC TAPE ABOVE ALL COMPONENTS OF SEPTIC SYSTEM AT A DEPTH OF 6 - 12 INCHES.

25. THE LICENSED INSTALLER SHALL PROVIDE A SEIVE ANALYSIS FOR STONE AGGREGATE PROVIDED.

26. HEAVY EQUIPMENT SHALL NOT BE DRIVEN OVER THE LEACHING SYSTEM AREA.

27. IF A PART OF THIS DESIGN IS TO BE ALTERED, THE GOVERNMENT SHALL BE NOTIFIED IN WRITING BEFORE CONSTRUCTION.

28. SOIL EVALUATION DATA OBTAINED FROM DEEP OBSERVATION HOLES AS SHOWN ON THE CONTRACT

DRAWINGS IS LIMITED TO SOIL CONDITIONS FOUND ONLY AT EACH DEEP OBSERVATION HOLE. THE RESULTS

ARE NOT CONSIDERED AN IMPLIED OR EXPRESSED WARRANTY OF SOIL CONDITIONS BEYOND LIMITS OF SUCH

DEEP OBSERVATION HOLES.

29. THE SEPTIC SYSTEM HAS BEEN DESIGNED TO PROCESS ONLY DOMESTIC SANITARY SEWAGE AT THE INDICATED

LOADING RATE. THE SYSTEM IS NOT DESIGNED TO ACCOMMODATE A GARBAGE DISPOSAL OR OTHER HIGH WATER USE UNITS.

30. ALL EXISTING FILL MATERIAL SHALL BE REMOVED WITHIN FOOTPRINT OF THE LEACHING TRENCHES AND ALL AROUND SYSTEM 5 FEET BEYOND EDGES OF

TRENCHES. USE SELECT FILL (SEE NOTE 18) AS NEEDED TO REPLACE FILL MATERIAL AROUND SYSTEM AND BETWEEN BOTTOM OF TRENCHES AND NATURAL SOIL.

1. THE GENERAL CONTRACTOR SHALL BE RESPONSIBLE FOR HORIZONTAL AND VERTICAL CONTROL OF ALL SYSTEM COMPONENTS.

HORIZONTAL COORDINATES SHOWN ARE IN U.S. SURVEY FEET AND REFERENCE THE CONNECTICUT (ZONE 0600) STATE PLANE COORDINATE SYSTEM (NAD83) AND ALL ELEVATIONS INDICATED REFER TO THE NORTH AMERICAN VERTICAL DATUM OF 1988

(NAVD88).

2. EXISTING SEWER PIPE INVERT AND TYPE FROM BUILDING OBTAINED FROM USACE RECORD DRAWING 'THAMES RIVER FLOOD CONTROL, WEST THOMPSON DAM, UTILITY BUILDING AND PARKING AREA', DATED APRIL 1963, REVISED 16 MAY 1963. THE

CONTRACTOR SHALL VERIFY THE EXISTING BUILDING SEWER ELEVATION AND PROVIDE THE GOVERNMENT WITH THE

ELEVATION FOR VERIFICATION PRIOR TO STARTING THE CONSTRUCTION OF THE SEPTIC SYSTEM.

3. EXISTING CONDITIONS SHOWN ARE FROM THE CORPS OF ENGINEERS SURVEY CONDUCTED DURING NOVEMBER 2020. ACTUAL LOCATION AND ALIGNMENT OF UNDERGROUND UTILITIES MAY VARY FROM THAT SHOWN ON THE DRAWINGS. THE CONTRACTOR IS RESPONSIBLE FOR FIELD VERIFICATION OF ALL UTILITIES PRIOR TO COMMENCING WORK AND SHALL PROTECT ALL EXISTING UTILITIES FROM ANY AND ALL DAMAGES THROUGHOUT THE DURATION OF THE PROJECT. THE CONTRACTOR SHALL BE FULLY RESPONSIBLE FOR

ANY AND ALL DAMAGES TO EXISTING UTILITIES. BENCHMARK DATA IS AS FOLLOWS:

LIMITS OF SELECT FILL

(SEE NOTE 30)

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AutoCAD SHX Text

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AutoCAD SHX Text 0515-P-1

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0515-DH-1

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TBM B