HomeMy WebLinkAboutMill River - Consultant Review - 40 DUNCAN DRIVE 12/28/2023
North Andover Health Department
Community and Economic Development Division
ONSITE WASTEWATER SYSTEM CONSTRUCTION NOTES
LOCATION INFORMATION
ADDRESS: 40 Duncan Drive MAP: 104.B LOT: 0051
INSTALLER: Peter Breen 978-687-7774
DESIGNER: Vladimir Nemchenok / Bill Dufresne
Merrimack Engineering 978-475-3555
PLAN DATE: 09.30.2023
BOH APPROVAL DATE ON PLAN: 10.25.2023
INSPECTIONS
TANK INSPECTION: 11.16.2023
DATE OF BED BOTTOM INSPECTION: 11.15.2023 – 11.16.2023
DATE OF FINAL CONSTRUCTION INSPECTION: 11/28/2023 – D. Ottenheimer
DATE OF FINAL GRADE INSPECTION: 11/30/2023 S. Peirce
SITE CONDITIONS
Contractor reports any changes to design plan
Existing septic tank properly abandoned, if
present
Internal plumbing all to one building sewer
Topography not appreciably altered
Comments: 11/28/23 – Two building sewer pipes are present as noted on design
plan. – D. Ottenheimer
SEPTIC TANK
Building sewer in continuous grade, on
compacted firm base
Cleanouts per plan
Bottom of tank hole has 6” stone base
Tank size and loading per plan
Monolithic tank construction
If monolithic, water tightness of tank has been
achieved by visual testing
Inlet tee installed, centered under access port
Outlet tee installed, centered under access port
Effluent filter installed
If effluent filter, riser to finished grade over filter
Riser with cover to within 6” of finish grade
installed over one access port
Manhole and riser minimum 20 inch diameter
Pipe penetrations appear watertight using
hydraulic cement
Comments: 11/28/23 – Building sewer pipes are backfilled, could not examine. –
D. Ottenheimer
PUMP CHAMBER
(Delete if not present) Bottom of tank hole has 6" stone base
Weep hole plugged
1000 gallon Pump Chamber installed
H-10 loading
Monolithic tank construction
Inlet tee installed, centered under access port
Pump(s) installed on stable base
Alarm float working
Pump On/Off floats working
Drain hole in pressure line
20” cover at final grade installed over pump
access port
Water tightness of tank has been achieved by
Visual testing
Hydraulic cement around inlet & outlet
Comments: 11/28/23 – Switched to different pump. Designer submitted cut
sheet previously. D. Ottenheimer
CONTROL PANEL
(Delete if not present) Alarm & Pump are on separate circuits
Visual & audible alarm works as intended
Location of control panel: Basement
Comments:
DISTRIBUTION-BOX
Installed on stable stone base
H-20 D-Box
Inlet tee (if pumped or >0.08’/foot)
Hydraulic cement around inlet & outlets
Even distribution observed
Schedule 40 PVC Pipe
Comments: 11/28/23 – One pipe exiting box was pitched up, contractor fixed
while present. – D. Ottenheimer
SOIL ABSORPTION SYSTEM (General)
Bottom of SAS excavated down to specified
soil layer, as provided on plan
Size of SAS excavated as per plan
Sand installed, if specified on plan
Sand displays few fines when handled
40 Mil HDPE barrier installed, if specified on
design plan
Laterals installed and ends capped or
connected to header and vented
Retaining wall material, location and height if
specified on plan
Comments:
FINAL GRADE
Final cover as per plan
Loamed
Seeded
Cover per plan
Comments:
DOCUMENTS NEEDED
Certification of Installation Form submitted
by designer and signed and dated by
designer and installer
As-Built Plan by designer
BM = 100.00
HR = 2.78
HI = 102.78
SYSTEM ELEVATIONS
ROD AS-BLT INVERT DESIGN INVERT
ELEVATION ELEV ELEV
Benchmark
Building Sewer OUT
Septic Tank IN 96.15
Septic Tank OUT 95.90
Pump Chamber IN 95.85
Pump Chamber OUT
Distribution Box IN 2.85 99.60 99.60
Distribution Box OUT 3.01 99.44 99.43
Lateral 1 BEGINNING 3.12 99.33 99.35
Lateral 1 END 3.24 99.21 99.20
Lateral 2 BEGINNING 3.13 99.32 99.35
Lateral 2 END 3.23 99.22 99.20
Lateral 3 BEGINNING 3.13 99.32 99.35
Lateral 3 END 3.24 99.21 99.20
Lateral 4 BEGINNING 3.11 99.34 99.35
Lateral 4 END 3.25 99.20 99.20
11/28/23 – Contractor reports tanks were set lower than specified on design plan
because the building sewer pipe was deeper than indicated on design plan. – D.
Ottenheimer