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TOWNSHIP OFFICES 915 VALLEY ROAD, GILLETTE, NJ 07933
908-647-8000 / www.longhillnj.gov
FORM MAY 2018
TOWNSHIP OF LONG HILL
COUNTY OF MORRIS
GILLETTE, HOMESTEAD PARK, MEYERSVILLE, MILLINGTON, STIRLING
ENGINEERING OFFICE
APPLICATION FOR LOT GRADING PLAN & INSPECTION
FOR OFFICE USE
Date Application
Received:
$400.00 Fee Received &
Check Number:
Comments Issued /
Date:
Prior to the issuance of a building permit, the Applicant shall submit four (4) copies of a lot grading plan to the Township Engineer along with
the fee of $400.00. The fee shall cover the cost of a preliminary site visit, review of initial submission and one (1) revision, two (2) site
inspections and submission of one (1) inspection report to the Construction Official. If more than two (2) inspections of a property are required
for any reason, the Applicant shall pay a fee for each additional inspection, based on the Township Engineer’s, or his representative’s regular
hourly rate. All fees for any additional inspections shall be paid prior to the issuance of a Certificate of Occupancy.
Approval by the Township Engineer of a Lot Grading Plan shall be required prior the issuance of building permit for the following:
A) The erection of any new dwelling which is not shown upon an approved site plan, or
B) Any other project requiring inspection or review by the Township Engineer not covered by engineering inspection fees such as drywell
design and inspection.
Unless advised otherwise, the Township Engineer will notify the Applicant and the Township Construction Official of the approval in
writing.
Work Site
Mailing Address:
Block & Lot(s):
Applicant Information:
Property Owner Information:
Name:
Name:
Address:
Address:
City & Zip:
City & Zip:
Phone #:
Phone #:
Email:
Email:
Plans Prepared By:
Name / Address / Phone
Means of Sewage Disposal:
_____ SEWER _____ SEPTIC If a septic system is proposed, 2 copies with Board
of Health stamp must accompany this application.
I hereby agree to comply with all Ordinances and governing regulations of the Township of Long Hill. If any work shall be done
in violation of any local, state or federal regulations the Township Engineer, or his representative, shall have the right to stop work
on the premises until such violation shall have been removed and there shall be no liability on the part of the Township because of
such stoppage of work.
Signature of Applicant Date
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TOWNSHIP OFFICES 915 VALLEY ROAD, GILLETTE, NJ 07933
908-647-8000 / www.longhillnj.gov
FORM MAY 2018
DRYWELL DESIGN CALCULATIONS
Drywells are an integral part of stormwater management. They provide a means of reducing runoff from a property by
allowing the water to seep into the ground and recharging the groundwater.
Per Section §146.8 of the Township of Long Hill Land Use Ordinance, drywells are required for any new impervious
areas such as roof areas, patios, driveways, recreation courts, etc. that are over 400 square feet in size. This provision
applies to the cumulative total of new impervious areas. (Example: A 350 SF addition and a 100 SF patio; the
cumulative total is 450 SF and a drywell is required.)
Drywells shall have the capacity to store a volume equal to four (4) inches of runoff from the impervious areas. The
following information can be used to help size drywells if you do not have a design by an engineer.
To determine the required size of the drywell, divide the total impervious area (A) by 100, then multiply that number
(B) by the corresponding tank volume/foot (C). This will provide the required depth of the drywell for a given
diameter tank.
CALCULATIONS:
The total new impervious area Square Feet
(A)
÷ 100 =
(A) (B)
x = vertical linear feet (VLF)
(B) (C) The required drywell depth below the pipe bottom.
For 6’ Diameter Drywell: Use C = 0.6 (0.6 VLF of drywell tank is required per 100 SF of impervious area)
For 8’ Diameter Drywell: Use C = 0.4 (0.4 VLF of drywell tank is required per 100 SF of impervious area)
EXAMPLES: (See construction details on the next page)
1) A 700 SF addition is proposed. The total new impervious area is 700 SF (A)
700 (A) ÷ 100 = 7 (B) Using a 6’ diameter drywell, (C) = 0.6
7 (B) x 0.6 (C) = 4.2 VLF requiredTherefore, the drywell tank must be at least 4.2 feet deep, below the pipe bottom.
2) A 1,000 SF addition and a 500 SF patio are proposed. The total new impervious area is 1,500 SF (A)
1,500 (A) ÷ 100 = 15 (B) Using an 8’ diameter drywell, (C) = 0.4
15 (B) x 0.4 (C) = 6.0 VLF required Therefore, the drywell tank must be at least 6 feet deep, below the pipe bottom.
3) Total new impervious area is 1,330 SF (A)
1,330 (A) ÷ 100 = 13.3 (B) Using a 6’ diameter drywell, (C) = 0.6
13.3 (B) x 0.6 (C) = 7.98 VLF required Therefore, the drywell tank must be at least 8 feet deep, below the pipe bottom.
You can use 1 / 6’ tank 8’ deep or 2 / 6’ tanks 4’ deep
NOTE: Please attach this calculation page and the drywell detail page to your Lot Grading Plan.
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TOWNSHIP OFFICES 915 VALLEY ROAD, GILLETTE, NJ 07933
908-647-8000 / www.longhillnj.gov
FORM MAY 2018
DRYWELL CONSTRUCTION DETAIL