1. (a) For the purposes of this section, the following definitions shall apply:

   1. (1) “Full occupancy” for residential use means:

      1. a. Two people per bedroom for all residences or the actual current occupancy of each residence, whichever is greater; and
      2. b. For senior housing, 2 people per residence;
   2. (2) “Full occupancy” for commercial use means the maximum use proposed in the ISDS application, such as the maximum seating for a restaurant;
   3. (3) “Light commercial flow” means flows from specialty retail business, medical and professional offices, conference centers, non-industrial uses, and non-warehouse uses; and
   4. (4) “Heavy commercial flow” means flows from factories, hotel and motels with restaurants or in-house linen cleaning, food and beverage service facilities, food and beverage processing facilities, dine-in and drive-through restaurants, industrial and warehouse uses excluding storage only facilities, laundromats, nursing homes, hospitals, and institutional settings.
2. (b) In order to determine the appropriate size of the septic system components, such as the septic tank and bed, the daily flow volume of sewage in gallons per day shall be determined as specified in this section.
3. (c) For existing and new uses, flow shall be based on the unit design flows listed in Table 1008-1, unless otherwise permitted in (d).

4. (d) Metered water readings shall be allowed as an alternative to (c), above, for a shared ISDS serving multiple residential units with a combined total of more than 12 bedrooms and for commercial structures, provided that:

   1. (1) For existing uses, metered water readings for the use as specified in (e), below, are available;
   2. (2) For new uses, metered water readings for uses that are as similar as possible to the proposed use are used, taking into consideration factors such as occupancy and frequency of use, determined as specified in (e), below; and
   3. (3) Flows are adjusted to full occupancy.

5. (e) Design flows based on metered water readings, pursuant to (d), above, shall be calculated by finding the average of water meter readings over a period of time that is not less than one year for full-time uses and not less than 4 months and encompassing an entire season of use for seasonable uses, provided that:

   1. (1) For a shared ISDS serving multiple residential units with a combined total of more than 12 bedrooms, the water meter readings shall be adjusted to be representative of the volume of water that will be used at full occupancy by dividing the actual water meter readings by the average number of occupants during the metered period to obtain the average flow volume per occupant and then multiplying this number by the expected number of occupants in each residence at full occupancy pursuant to (a)(2), above;
   2. (2) For commercial structures, the water meter readings shall be representative of the use at maximum capacity, production, or output, as applicable;
   3. (3) The water meter readings shall not be taken during a period of zero occupancy for residential structures or periods of zero capacity, production, or output for commercial uses; and

   4. (4) The average water meter readings shall be:

      1. a. Multiplied by a minimum peaking factor of 2 for a shared ISDS serving multiple residential units with a combined total of more than 12 bedrooms or for commercial light flow; or
      2. b. Multiplied by a peaking factor of 3 for commercial heavy flow.

6. (f) The unit design flow figures referenced in (b) and (c), above, shall be as listed in Table 1008-1, below, subject to (f) through (h), below:

   Table 1008-1: Unit Design Flow Figures

   Use

   Unit Design Flow

   AIRPORTS

   5 GPD/Transient plus 10 GPD/Employee

   APARTMENTS

   See Dwellings

   BARS, LOUNGES

   See Food Service

   BED & BREAKFAST

   60 GPD/Guest, based on the greater of 2 guests per room or the actual number of guests the room is designed to accommodate, plus 10 GPD/Employee

   BUNKHOUSE

   60 GPD/Person

   RECREATIONAL CAMPGROUNDS & CAMPS:

   Site Using a Central Comfort Station

   45 GPD/site

   Site with 3-way Hookups; RVs and Park Models up to 400 SF

   60 GPD/Hookup or Unit

   Site Using an On-Site Dump Station only

   60 GPD/Site

   Cabin up to 400 SF with Water Service

   165 GPD/Cabin

   Cabins and Park Models over 400 SF

   See DWELLINGS/RESIDENTIAL STRUCTURES

   Construction Camps

   50 GPD/Person

   Day Camps (not including meals)

   15 GPD/Person

   Dining Facility

   3 GPD/Person/meal

   Residential Youth Recreation Camps

   30 GPD/Person plus 3 GPD/Person/meal

   CATERERS – Function Rooms

   12 GPD/patron

   CHURCHES:

   Sanctuary Seating

   3 GPD/Seat

   Church Suppers

   12 GPD/Seat

   COUNTRY CLUBS – PRIVATE

   Dining Room

   10 GPD/Seat

   Snack Bar

   10 GPD/Seat

   Locker & Showers

   20 GPD/Locker

   DAY CARE CENTERS

   10 GPD/Person

   DENTISTS

   10 GPD/Chair plus 35 GPD/Staff Member

   DOCTOR’S OFFICES

   250 GPD/Doctor

   DOG KENNELS

   50 GPD/Kennel, with one dog per kennel

   DWELLINGS/RESIDENTIAL STRUCTURES:

   Apartment or Condo - Studio or Single Bedroom

   225 GPD

   Apartment or Condo having 2 or more Bedrooms

   150 GPD/Bedroom

   Residence - Single-Family House

   300 GPD plus 150 GPD for each bedroom over 2

   Rooming House – With Meals

   75 GPD/Person

   Rooming House – Without Meals

   50 GPD/Person

   Senior Housing

   See Senior Housing

   FACTORIES (Exclusive of Industrial Waste):

   Without Cafeteria or Showers

   10 GPD/Person

   With Cafeteria, No Showers

   15 GPD/Person

   With Cafeteria and Showers

   20 GPD/Person

   Warehouses

   10 GPD/Person

   FIRE STATIONS – Without full-time employees; without floor drains or food preparation

   5 GPD/Person

   FOOD SERVICE:

   Cafeteria or table service, plus toilet and kitchen waste

   40 GPD/Seat plus 20 GPD/Employee

   Cafeteria or table service, paper service, plus toilet and kitchen waste

   20 GPD/Seat plus 20 GPD/Employee

   Drive-through Restaurants

   3 GPD/Meal Served plus 20 GPD/Employee

   Ice cream dipper

   100 GPD/dipper plus 20 GPD/Employee

   Kitchen Waste only

   3 GPD/Meal served plus 20 GPD/Employee

   Bars and lounges

   20 GPD/Seat plus 20 GPD/Employee

   Function Rooms

   12 GPD/Seat plus 20 GPD/Employee

   GYMS

   See Recreational Facilities

   HAIRDRESSERS

   150 GPD/Chair plus 20 GPD/Employee

   HOSPITALS

   200 GPD/Bed plus 20 GPD/Employee

   HOTELS AND MOTELS

   200 GPD/Room plus 10 GPD/Employee

   INSTITUTIONS OTHER THAN HOSPITALS

   See Residential Institutions

   LAUNDROMATS, COIN-OPERATED

   500 GPD/Machine

   LOUNGES

   See Food Service, Bars/Lounges

   MANUFACTURED HOUSING PARKS:

   Single bedroom homes

   225 GPD

   Homes with more than one bedroom

   150 GPD/Bedroom/Site with 300 GPD/Site minimum

   MOTELS, see HOTELS

   NURSING HOMES

   125 GPD/Bed plus 20 GPD/Employee

   OFFICE BUILDINGS:

   Without Cafeteria

   10 GPD/Employee

   With Cafeteria

   15 GPD/ Employee

   Unspecified Office Space

   5 GPD/100 SF

   PICNIC PARKS

   See Recreational Facilities

   PUBLIC RESTROOM (NO SHOWERS)

   5 GPD/Transient if not included in other design flows

   RECREATIONAL FACILITIES

   Gyms & Exercise Facilities with Toilet Waste Only

   5 GPD/Member + 20 GPD/Employee

   Gyms & Exercise Facilities with Showers and Toilets

   15GPD/Member + 20 GPD/Employee

   Sporting Complex with Showers and Toilets

   15 GPD/Participant plus 3 GPD/Spectator seat plus 20 GPD/employee

   Sporting Complex with Toilet Waste Only

   5 GPD/Participant plus 3 GPD/Spectator seat plus 20 GPD/Employee

   RESIDENTIAL INSTITUTIONS OTHER THAN HOSPITALS AND NURSING HOMES

   135 GPD/Bed plus 20 GPD/Employee

   RESTAURANTS

   See Food Service

   SCHOOLS:

   Boarding

   100 GPD/Resident student or employee

   plus Day School loading for non-resident students and employees

   Day, Without Gym, Cafeteria, or Showers

   10 GPD/Student or employee

   Day, Without Gyms or Showers, with Cafeteria

   15 GPD/Student or employee

   Day, With Gyms, Showers, and Cafeteria

   25 GPD/student plus 15 GPD/employee

   SENIOR HOUSING

   150 GPD/2 Bedroom unit with a maximum of 2 persons occupancy per unit

   SERVICE STATIONS

   75 GPD/Island plus 10 GPD/Employee

   SKATING RINKS

   See RECREATIONAL FACILITIES

   SKI AREAS

   See Recreational Facilities

   STORES:

   Dry Goods

   5 GPD/100 SF plus 10 GPD/employee

   Supermarkets with Meat Dept. without Garbage Grinder

   7.5 GPD/100 SF

   Supermarkets with Meat Dept. with Garbage Grinder

   11 GPD/100 SF

   SWIMMING POOLS, Public

   See Recreational Facilities

   TENNIS COURTS

   See Recreational Facilities

   THEATERS

   3 GPD/Auditorium Seat/Show

   TOWN HALLS

   5 GPD/Seat for total seating capacity

   TOWN OFFICES

   10 GPD/Office employee plus 5 GPD /Transient

   TRAVEL TRAILER PARKS

   See Camps

   WAREHOUSES

   See Factories

7. (g) For any combination of uses, such as a day camp that serves meals, a recreational facility that has a cafeteria, a ski area that has a day care, or a single-family residence that also has a studio or one bedroom apartment, the combined total flows shall be used to determine lot loading, but EDA size shall be determined as separate uses and sized in accordance with Env-Wq 1010 for tank sizing, Env-Wq 1016 for bed sizes, and Env-Wq 1024 for ITA approvals and approved manuals for bed sizes.
8. (h) If the use for any structure is not listed in Table 1008-1, the permitted designer shall estimate the maximum daily flow using one or more of the uses that are listed in Table 1008-1 and that best represent the structure’s use or uses, and submit documentation to support the estimated maximum daily flow.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; amd by #12716, eff 1-24-19; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36 (formerly Env-Wq 1008.03)