HomeMy WebLinkAboutConstruction Notes - Consultant Review - 203 MILL ROAD 6/6/2019
North Andover Health Department
Community and Economic Development Division
ONSITE WASTEWATER SYSTEM CONSTRUCTION NOTES
LOCATION INFORMATION
ADDRESS: 203 Mill Road (formerly 865 Johnson Road Lot 1B)
MAP: 107A LOT: 28
INSTALLER: Tim Quinlan 978-457-0528
DESIGNER: Vladimir Nemchenok – Merrimack Engineering Services
PLAN DATE: 6/8/2017 revised 1/8/2018, 1/24/2018,2/1/2018
BOH APPROVAL DATE ON PLAN: 6/18/2018
INSPECTIONS
TANK INSPECTION: 3/19/2019
DATE OF BED BOTTOM INSPECTION: 3/20/2019 and 3/21/2019
DATE OF FINAL CONSTRUCTION INSPECTION: 4/2/2019
DATE OF FINAL GRADE INSPECTION:
SITE CONDITIONS
Contractor reports any changes to design plan
N/A Existing septic tank properly abandoned
Internal plumbing all to one building sewer
Topography not appreciably altered
Comments: Installer moved D-box to be in the middle of the trenches to provide
an equal slope to between each trench
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
(gas baffle)
24" inch cover to within 6” of finish grade
installed over one access port
Hydraulic cement around inlet & outlet
Comments: Installer will have a cleanout installed between the two bends in the
building sewer line. He will send a photo to the BOH office upon completion.
DISTRIBUTION-BOX
Installed on stable stone base
H-20 D-Box
N/A 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
N/A40 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: Excavating field in stages due to high ground water. Bottom of bed
excavated down to elevation 219.5 on 3/20/2019 in stage 1. Stage 2 inspected
on 3/21/2019 same elevation.
FINAL GRADE
Loamed
Seeded
Cover per plan
Comments: inspected by S. Casey 6/5/2019
DOCUMENTS NEEDED
Certification of Installation Form submitted
By engineer and signed and dated by
Engineer and installer
As-Built Plan
BM = 228.00 (TOF)
HR = 3.96
HI = 231.96
SYSTEM ELEVATIONS
ROD AS-BLT INVERT DESIGN INVERT
ELEVATION ELEV ELEV
Benchmark
Building Sewer OUT 5.24 226.37 226.25
Septic Tank IN 5.41 226.20 226.05
Septic Tank OUT 5.78 225.83 225.80
Distribution Box IN 6.12 225.49 225.50
Distribution Box OUT 6.26 / 6.27 225.35 / 225.34 225.33
Lateral 1 TOP 6.29 / 6.70
Lateral 1 INVERT 225.32 / 224.91 225.30 / 224.90
Lateral 2 TOP 6.28 / 6.70
Lateral 2 INVERT 225.33 / 224.91 225.30 / 224.90
Bottom of Bed 8.01 223.95 223.90