1. (1) Each component of an on-site subsurface sewage disposal system shall be designed to treat sanitary sewage discharged from all buildings to be served by the system using the System Sewage Flow Design flows set forth at 310 CMR 15.203(2) through (5), except as provided in 310 CMR 15.203(6). Actual water meter data shall not be substituted for the design flow criteria for the activities listed in 310 CMR 15.203(2) through (5) unless pursuant to 310 CMR 15.416. Design flow is equivalent to estimated generated flow for the proposed use plus a factor representing flow variations.

   MINIMUM ALLOWABLE GPD FOR

   GALLONS SYSTEM

TYPE OF ESTABLISHMENT UNIT PER DAY DESIGN

1. (2) RESIDENTIAL Bed & Breakfast per bedroom 110 440 Bed & Breakfast per bedroom 110 with restaurant open per seat 35 1000 to public add Camp, resident, mess hall, per person* 35 washroom and toilets Camp, day, washroom per person 10 and toilets Camp, day, mess hall, per person 13 washroom and toilets Campground, showers and toilets per site 90 Family Dwelling, Single per bedroom 110 330** including, but not limited to, single family condominiums & cooperatives Family Dwelling, Multiple per bedroom 110 *** Family Mobile Home Park per mobile home 300 Motel, Hotel, Boarding per bedroom 110 House Retirement Mobile Home Park per site 150 Housing for the Elderly per two bedroom

   unit 150****

   Work or Construction Camp per person 50

* Person in the context of 310 CMR 15.203 means an individual. ** A system may be designed for flows of not less than 220 gpd, if a deed restriction essentially identical

to the model Grant of Title 5 Bedroom Count Deed Restriction developed by the Department, is provided that limits the dwelling to two bed rooms as the term "bedroom" is defined in 310 CMR 15.002. A home office or home retail business whose only employees reside in the home, where no additional wastewater is generated other than toilet and hand washing waste, is not considered a change in the type of establishment and does not require the addition of flow for the purpose of designing the system.

*** The number of bedrooms in a condominium shall be as specified in the Master Deed. Establish-

ment of bedrooms in excess of the specified number shall be considered an increase in design flow. A home office or home retail business whose only employees reside in the home, where no additional wastewater is generated other than toilet and hand washing waste, is not considered a change in the type of establishment and does not require the addition of flow for the purpose of designing the system.

**** One bedroom unit Housing for the Elderly, and units with more than two bedrooms shall be designed

based on 110 gallons per day per bedroom.

1. (3) COMMERCIAL Airport per passenger 5 150 Barber Shop/Beauty Salon per chair 100 Bowling Alley per alley 100 Country Club, dining room per seat 10 Country Club, snack bar or lunch room per seat 10 Country Club, lockers and showers per locker 20 Doctor Office per doctor 250 Dentist Office per dentist 200

   MINIMUM ALLOWABLE GPD FOR

   GALLONS SYSTEM

TYPE OF ESTABLISHMENT UNIT PER DAY DESIGN

1. (3) COMMERCIAL (continued)

Factory, Industrial Plant, per person 15 Warehouse or Dry Storage Space without cafeteria Factory, Industrial Plant, Warehouse or Dry Storage Space with cafeteria per person 20

Gasoline Station per island***** 75 300 with service bays per bay 125

***** Plus flows for bays, if any

Kennel/Veterinary Office per kennel 50 Lounge, Tavern per seat 20 Marina per slip 10 500 Movie Theater per seat 5 Non-single family/ per washing 400 automatic clothes washer machine Office building per 1000 sq.ft. 75 200 Retail Store (except supermarkets) per 1000 sq.ft. 50 200 Restaurant per seat 35 1000 Restaurant, thruway per seat 150 1000 service area Restaurant, Fast Food per seat 20 1000 Restaurant, kitchen flow per seat 15 [for sizing of grease trap only] Service Station per bay 150 450 [no gas] Skating Rink per seat 5 3000 Supermarkets per 1000 sq.ft. 97 Swimming Pool per person 10 Tennis Club per court 250 Theater, Auditorium per seat 3 Trailer, dump station per trailer 75

1. (4) INSTITUTIONAL Place of worship without kitchen per seat 3 with kitchen per seat 6 Correctional Facility per bed 200 Function Hall per seat 15 Gymnasium per participant 25 Gymnasium per spectator 3 Hospital per bed 200 Nursing Home/Rest Home per bed 150 Assisted Living Facilities per bed 150 Public Park, toilet per person 5 waste only

   MINIMUM ALLOWABLE GPD FOR

   GALLONS SYSTEM

TYPE OF ESTABLISHMENT UNIT PER DAY DESIGN

1. (4) INSTITUTIONAL (continued)

Public Park, bathhouse, per person 10 showers and flush toilets Day Care Facility per person 10

1. (5) SCHOOLS****** Elementary School, without cafeteria, gymnasium or showers per person 5 Elementary School, with cafeteria but no gymnasium with showers per person 8 Elementary School, with cafeteria, gymnasium and showers per person 10 Secondary/Middle School, without cafeteria, gymnasium or showers per person 10 Secondary/Middle School, with cafeteria but no gymnasium or showers per person 15 Secondary/Middle School, with cafeteria, gymnasium and showers per person 20 Boarding Schools, Colleges per person 65

****** All schools to be served by an alternative technology approved pursuant to 310 CMR 15.280 through

15.288 shall have an equalization basin as part of the system design and have it installed prior to the treatment device.

1. (6) Facilities other than those listed in 310 CMR 15.203(2) through (5), and nonresidential facilities with unique design features that result in significantly different design flows than those listed above may apply to the Department for a determination of design flow using actual meter readings of established flows from existing or similar installations without the need for a variance pursuant to 310 CMR 15.410 or 15.416. Prior to making a determination the Department will consult with the local Approving Authority. For state and federal facilities, the Department may also establish system design flows other than those listed above using actual meter readings of established flows from existing or similar installations. Any design flow established by the Department pursuant to 310 CMR 15.203(6), shall be based on 200% of average water meter readings in order to assimilate maximum daily flows or on other methods determined to be appropriate by the Department.
2. (7) In schools, flows generated from sinks or other drains receiving wastes from science laboratories, graphics arts classrooms, or vocational school activities, including, but not limited to, automotive repair painting, or metal fabrication are classified industrial wastes and shall be directed pursuant to an appropriate permit, to a sewer, if a sewer connection is feasible and, if not, then to an industrial waste holding tank in accordance with 314 CMR 18.000: Industrial Wastewater Holding Tank and Container Construction, Operation, and Record Keeping Requirements or an approved hazardous waste collection receptacle.