HomeMy WebLinkAboutConstruction Notes - Consultant Review - 204 MILL ROAD 4/16/2020
North Andover Health Department
Community and Economic Development Division
ONSITE WASTEWATER SYSTEM CONSTRUCTION NOTES
LOCATION INFORMATION
ADDRESS: 204 Mill Road MAP: 107A LOT: 63
INSTALLER: Todd Bateson
DESIGNER: John Sullivan
PLAN DATE: 5/29/19
BOH APPROVAL DATE ON PLAN:
INSPECTIONS
TANK INSPECTION: completed
DATE OF BED BOTTOM INSPECTION: completed
DATE OF FINAL CONSTRUCTION INSPECTION: 4/13/20
DATE OF FINAL GRADE INSPECTION: completed
SITE CONDITIONS
Contractor reports any changes to design plan
Existing septic tank properly abandoned
Internal plumbing all to one building sewer
Topography not appreciably altered
Comments: 4/13/20 – Contractor reports building sewer exiting house is slightly
lower than expected but cannot be raised.
SEPTIC TANK
Building sewer in continuous grade, on
compacted firm base
Cleanouts per plan
Bottom of tank hole has 6” stone base
Weep hole plugged
1500 gallon tank has been installed
H-10 loading
Monolithic tank construction
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)
24" inch cover to within 6” of finish grade
installed over one access port
Neoprene boots around inlet & outlet
Comments: 4/13/20 – H-10 tank provided, plan specifies H-20 tank. Installer
reports he spoke with designer and received authorization to change.
DISTRIBUTION-BOX
Installed on stable stone base
H-20 D-Box
Inlet tee (if pumped or >0.08’/foot)
Hydraulic cement around inlet & outlets
Observed even distribution
Speed levelers provided (not required)
Schedule 40 PVC Pipe
Comments:
SOIL ABSORPTION SYSTEM (General)
Bottom of SAS excavated down to C soil layer,
as provided on plan
Size of SAS excavated as per plan
Title 5 sand installed, if specified on plan
40 Mil HDPE barrier installed
Laterals installed and ends connected to
header (and vented if impervious material
above)
Elevations of laterals and chambers installed as on
approved plan
N/ARetaining wall (boulder / concrete / timber/ block)
Final cover as per plan
Comments:
SOIL ABSORPTION SYSTEM (Gravel-less Chambers)
Brand and Model of Chamber: Low Profile
Standard Quick 4 Infiltrator Chambers
Number of chambers per row: 11
Number of rows (trenches): 3
Comments: Total Chambers = _33___
FINAL GRADE
Loamed
Seeded
Cover per plan
Comments:
DOCUMENTS NEEDED
Certification of Installation Form submitted
By engineer and signed and dated by
Engineer and installer
As-Built Plan
BM = 99.66
HR = 3.93
HI = 103.59
SYSTEM ELEVATIONS
ROD AS-BLT INVERT DESIGN INVERT
ELEVATION ELEV ELEV
Building Sewer OUT 7.50 95.76 96.21
Septic Tank IN 7.61 95.65 95.87
Septic Tank OUT 7.84 95.42 95.62
Distribution Box IN 8.13 95.13 95.27
Distribution Box OUT 8.31 94.95 95.10
Lateral 1 INVERT 8.36 94.90 95.07
Lateral 2 INVERT 8.38 94.88 95.07
Lateral 3 INVERT 8.34 94.92 95.07
Top of Chamber 8.30 95.29 95.49
Bottom of Bed/Chamber 8.94 94.65 94.82