DAR File No. 32406

Environmental Quality, Drinking Water

R309-510

Facility Design and Operation: Minimum Sizing Requirements

NOTICE OF PROPOSED RULE

DAR File No.: 32406
Filed: 02/26/2009, 10:26
Received by: NL

RULE ANALYSIS

Purpose of the rule or reason for the change:

The purpose of this amendment is to address the conditions for which a reduction of requirements may be granted and the method of determining a value.

Summary of the rule or change:

This amendment clears up misgivings concerning what type of data is acceptable for a reduction of required source capacity, water right, and peak instantaneous demands; and establishes a number (90th percentile of readings) as a final value.

State statutory or constitutional authorization for this rule:

Section 19-4-104

Anticipated cost or savings to:

the state budget:

None--Since this amendment only clarifies this portion of the rule, and the reduced quantity for either source capacity, water right, or peak instantaneous demands will not increase workload or require additional personnel or other funds from the state budget.

local governments:

Little to None--Most, if not all, well functioning Public Water Systems operated by local government currently meet or exceed the minimum sizing requirements. This change will only impact those non-community type systems where water usage is less than required by rule. In these cases, after submission of acceptable data, these systems should be able to expand the number of service connections without adding new source capacity, water right, or increased piping.

small businesses and persons other than businesses:

Little to None--This change will only impact those non-community type systems where water usage is less than required by rule. In these cases, after submission of acceptable data, these systems should be able to expand the number of service connections without adding new source capacity, water right, or increased piping.

Compliance costs for affected persons:

Little to None--This change will only impact those non-community type systems where water usage is less than required by rule. In these cases, after submission of acceptable data, these systems should be able to expand the number of service connections without adding new source capacity, water right, or increased piping. By expanding the number of service connections, cost of water service to individuals served by these systems should actually be reduced.

Comments by the department head on the fiscal impact the rule may have on businesses:

The department agrees that the proposed changes to this rule will have little to no detrimental impact on existing water systems or to new public water systems. William Sinclair, Acting Executive Director

The full text of this rule may be inspected, during regular business hours, at the Division of Administrative Rules, or at:

Environmental Quality
Drinking Water
150 N 1950 W
SALT LAKE CITY UT 84116-3085

Direct questions regarding this rule to:

Bill Birkes at the above address, by phone at 801-536-4201, by FAX at 801-536-4211, or by Internet E-mail at bbirkes@utah.gov

Interested persons may present their views on this rule by submitting written comments to the address above no later than 5:00 p.m. on:

04/14/2009

This rule may become effective on:

04/21/2009

Authorized by:

Ken Bousfield, Director

R309. Environmental Quality, Drinking Water.

R309-510. Facility Design and Operation: Minimum Sizing Requirements.

R309-510-5. Reduction of Requirements.

If acceptable data are presented, certain number of days of peak day demand to establish minimum source capacity; certain number of years of annual demand to establish minimum water right requirements; and certain number of readings of peak hourly demand to establish minimum peak instantaneous demand;[at or above the 90% confidence level,] showing that the requirements made herein are excessive for a given project, the requirements may be appropriately reduced to the 90th percentile of readings, on a case by case basis by the Executive Secretary. In the case of Recreational Home Developments, in order to qualify for a quantity reduction, not only must the actual water consumption be less than quantities required by rule [(with the confidence level indicated above) ]but enforceable policy restrictions must have been approved which prevent the use of such dwellings as a permanent domicile and these restrictions shall have been consistently enforced. The Executive Secretary may re-consider any reduced minimums if the nature and use of the system changes.

 

R309-510-7. Source Sizing.

(1) Peak Day Demand and Average Yearly Demand.

Sources shall legally and physically meet water demands under two separate conditions. First, they shall meet the anticipated water demand on the day of highest water consumption. This is referred to as the peak day demand. Second, they shall also be able to provide one year's supply of water, the average yearly demand.

(2) Estimated Indoor Use.

In the absence of firm water use data, Tables 510-1 and 510-2 shall be used to estimate the peak day demand and average yearly demand for indoor water use.

 

TABLE 510-1
Source Demand for Indoor Use

Type of Connection   Peak Day Demand   Average Yearly Demand



 Year-round use

   Residential       800 gpd/conn      146,000 gal./conn

   ERC               800 gpd/ERC       146,000 gal./ERC

 Seasonal/Non-residential use

   Modern Recreation Camp          60 gpd/person      (see note 1)

   Semi-Developed Camp

    a.  with pit privies            5 gpd/person      (see note 1)

    b.  with flush toilets         20 gpd/person      (see note 1)

   Hotel, Motel, and Resort       150 gpd/unit        (see note 1)

   Labor Camp                      50 gpd/person      (see note 1)

   Recreational Vehicle Park      100 gpd/pad         (see note 1)

   Roadway Rest Stop                7 gpd/vehicle     (see note 1)

   Recreational Home Development  400 gpd/conn        (see note 1)



Note 1.  Annual demand shall be based on the number of days the

system will be open during the year times the peak day demand

unless data acceptable to the Division, with a confidence level of

90% or greater showing a lesser annual consumption, can be presented.

 

TABLE 510-2
Source Demand for Individual Establishments^(a)
(Indoor Use)

Type of Establishment                      Peak Day Demand

                                                (gpd)

Airports

 a.  per passenger                                  3

 b.  per employee                                  15
 
Boarding Houses

 a.  for each resident boarder and employee        50

 b.  for each nonresident boarders                 10

Bowling Alleys, per alley

 a.  with snack bar                               100

 b.  with no snack bar                             85

Churches, per person                                5

Country Clubs

 a.  per resident member                          100

 b.  per nonresident member present                25

 c.  per employee                                  15

Dentist's Office

 a.  per chair                                    200

 b.  per staff member                              35

Doctor's Office

 a.  per patient                                   10

 b.  per staff member                              35

Fairgrounds, per person                             1

Fire Stations, per person

 a.  with full-time employees and food prep.       70

 b.  with no full-time employees and no food prep.  5

Gyms

 a.  per participant                               25

 b.  per spectator                                  4

Hairdresser

 a.  per chair                                     50

 b.  per operator                                  35

Hospitals, per bed space                          250

Industrial Buildings, per 8 hour shift,

 per employee (exclusive of industrial waste)

 a.  with showers                                  35

 b.  with no showers                               15

Launderette, per washer                           580

Movie Theaters

 a.  auditorium, per seat                           5

 b.  drive-in, per car space                       10

Nursing Homes, per bed space                      280

Office Buildings and Business Establishments,

 per shift, per employee (sanitary wastes only)

 a.  with cafeteria                                25

 b.  with no cafeteria                             15

Picnic Parks, per person (toilet wastes only)       5

Restaurants

 a.  ordinary restaurants (not 24 hour service)  35 per seat

 b.  24 hour service                             50 per seat

 c.  single service customer utensils only    2 per customer

 d.  or, per customer served

 (includes toilet and kitchen wastes)              10

Rooming House, per person                          40

Schools, per person

 a.  boarding                                      75

 b.  day, without cafeteria, gym or showers        15

 c.  day, with cafeteria, but no gym or showers    20

 d.  day, with cafeteria, gym and showers          25

Service Stations(b) ,per vehicle served            10

Skating Rink, Dance Halls, etc., per person

 a.  no kitchen wastes                             10

 b.  Additional for kitchen wastes                  3

Ski Areas, per person (no kitchen wastes)          10

Stores

 a.  per public toilet room                       500

 b.  per employee                                  11

Swimming Pools and Bathhouses(c) ,per person       10

Taverns, Bars, Cocktail Lounges, per seat          20

Visitor Centers, per visitor                        5



NOTES FOR TABLE 510-2:

     1.  Source capacity must at least equal the peak day

demand of the system.  Estimate this by assuming the facility

is used to its maximum.

     2.  Generally, storage volume must at least equal one

average day's demand.

     3.  Peak instantaneous demands may be estimated by

fixture unit analysis as per Appendix E of the 2006[200]

International Plumbing Code.

     (a)  When more than one use will occur, the multiple

use shall be considered in determining total demand.

Small industrial plants maintaining a cafeteria and/or showers

and club houses or motels maintaining swimming pools and/or

laundries are typical examples of multiple uses.  Uses other

than those listed above shall be considered in relation to

established demands from known or similar installations.

     (b)  or 250 gpd per pump,

     (c)   20 x {Water Area (Ft2) / 30} + Deck Area (Ft2)

 

(3) Estimated Outdoor Use.

In the absence of firm water use data, Table 510-3 shall be used to estimate the peak day demand and average yearly demand for outdoor water use. The following procedure shall be used:

(a) Determine the location of the water system on the map entitled Irrigated Crop Consumptive Use Zones and Normal Annual Effective Precipitation, Utah as prepared by the Soil Conservation Service (available from the Division). Find the numbered zone, one through six, in which the water system is located (if located in an area described "non-arable" find nearest numbered zone).

(b) Determine the net number of acres which may be irrigated. This is generally done by starting with the gross acreage, then subtract out any area of roadway, driveway, sidewalk or patio pavements along with housing foundation footprints that can be reasonably expected for lots within a new subdivision or which is representative of existing lots. Before any other land area which may be considered "non-irrigated" (e.g. steep slopes, wooded areas, etc.) is subtracted from the gross area, the Division shall be consulted and agree that the land in question will not be irrigated.

(c) Refer to Table 510-3 to determine peak day demand and average yearly demand for outdoor use.

(d) The results of the indoor use and outdoor use tables shall be added together and source(s) shall be legally and physically capable of meeting this combined demand.

 

TABLE 510-3
Source Demand for Irrigation
(Outdoor Use)

Map Zone      Peak Day Demand         Average Yearly Demand

            (gpm/irrigated acre)       (AF/irrigated acre)

   1                2.26                      1.17

   2                2.80                      1.23

   3                3.39                      1.66

   4                3.96                      1.87

   5                4.52                      2.69

   6                4.90                      3.26

 

(4) Accounting for Variations in Source Yield.

The design engineer shall consider whether flow from the source(s) may vary. Where flow varies, as is the case for most springs, the minimum flowrate shall be used in determining the number of connections which may be supported by the source(s). Where historical records are sufficient, and where peak flows from the source(s) correspond with peak demand periods, the Executive Secretary may grant an exception to this requirement.

 

R309-510-8. Storage Sizing.

(1) General.

Each storage facility shall provide:

(a) equalization storage volume, to satisfy average[peak] day demands for water for indoor use as well as outdoor use,

(b) fire suppression storage volume, if the water system is equipped with fire hydrants and intended to provide fire suppression water, and

(c) emergency storage, if deemed appropriate by the water supplier or the Executive Secretary, to meet demands in the event of an unexpected emergency situation such as a line break or a treatment plant failures.

(2) Equalization Storage.

(a) All public drinking water systems shall be provided with equalization storage. The amount of equalization storage which must be provided varies with the nature of the water system, the extent of outdoor use and the location of the system.

(b) Required equalization storage for indoor use is provided in Table 510-4. Storage requirements for non-community systems not listed in this table shall be determined by calculating the average day demands from the information given in Table 510-2.

 

TABLE 510-4
Storage Volume for Indoor Use

            Type                         Volume Required

                                            (gallons)

           Community Systems

Residential;

 per single resident service connection          400

Non-Residential[Residentail];

 per Equivalent Residential Connection (ERC)     400



           Non-Community Systems

Modern Recreation Camp; per person                30

Semi-Developed Camp; per person

 a.  with Pit Privies                              2.5

 b.  with Flush Toilets                           10

Hotel, Motel and Resort; per unit                 75

Labor Camp; per unit                              25

Recreational Vehicle Park; per pad                50

Roadway Rest Stop; per vehicle                     3.5

Recreational Home Development; per connection    400

 

(c) Where the drinking water system provides water for outdoor use, such as the irrigation of lawns and gardens, the equalization storage volumes estimated in Table 510-5 shall be added to the indoor volumes estimated in Table 510-4. The procedure for determining the map zone and irrigated acreage for using Table 510-5 is outlined in Section R309-510-7(3).

 

TABLE 510-5
Storage Volume for Outdoor Use

Map Zone                           Volume Required

                              (gallons/irrigated acre)

   1                                   1,782

   2                                   1,873

   3                                   2,528

   4                                   2,848

   5                                   4,081

   6                                   4,964

 

(3) Fire Suppression Storage.

Fire suppression storage shall be required if the water system is intended to provide fire fighting water as evidenced by fire hydrants connected to the piping. The design engineer shall consult with the local fire suppression authority regarding needed fire flows in the area under consideration. This information shall be provided to the Division. Where no local fire suppression authority exists, needed fire suppression storage shall be assumed to be 120,000 gallons (1000 gpm for 2 hours).

(4) Emergency Storage.

Emergency storage shall be considered during the design process. The amount of emergency storage shall be based upon an assessment of risk and the desired degree of system dependability. The Executive Secretary may require emergency storage when it is warranted to protect public health and welfare.

 

R309-510-9. Distribution System Sizing.

(1) General Requirements.

The distribution system shall be designed to insure that minimum water pressures as required in R309-105-9 exist at all points within the system. If the distribution system is equipped with fire hydrants, the Division will require a letter from the local fire authority stating the fire flow and duration required of the area to insure the system shall be designed to provide minimum pressures as required in R309-105-9 to exist at all points within the system when needed fire flows are imposed upon the peak day demand flows of the system.

(2) Indoor Use, Estimated Peak Instantaneous Demand.

(a) For community water systems and large non-community systems, the peak instantaneous demand for each pipeline shall be assumed for indoor use as:

Q = 10.8 x N^0.64

where N equals the total number of ERC's, and Q equals the total flow (gpm) delivered to the total connections served by that pipeline.

For Recreational Vehicle Parks, the peak instantaneous flow for indoor use shall be based on the following:

 

TABLE 510-6

Peak Instantaneous Demand for Recreational Vehicle Parks



Number of Connections                     Formula

      0 to 59                             Q = 4N

     60 to 239                            Q = 80 + 20N0.5

    240 or greater                        Q = 1.6N



     NOTES FOR TABLE 510-6:

     Q is total peak instantaneous demand (gpm) and N is the

maximum number of connections.  However, if the only water use

is via service buildings the peak instantaneous demand shall

be calculated for the number of fixture units as presented in

Appendix E of the 2006[2000] International Plumbing Code.

 

(b) For small non-community water systems the peak instantaneous demand to be estimated for indoor use shall be calculated on a per-building basis for the number of fixture units as presented in Appendix E of the 2006[2000] International Plumbing Code.

(3) Outdoor Use, Estimated Peak Instantaneous Demand.

Peak instantaneous demand to be estimated for outdoor use is given in Table 510-7. The procedure for determining the map zone and irrigated acreage for using Table 510-7 is outlined in Section R309-510-7(3).

 

TABLE 510-7

Peak Instantaneous Demand for Outdoor Use



Map Zone                      Peak Instantaneous Demand

                                 (gpm/irrigated acre)

   1                                     4.52

   2                                     5.60

   3                                     6.78

   4                                     7.92

   5                                     9.04

   6                                     9.80

 

(4) Fire Flows.

(a) Distribution systems shall be designed to deliver needed fire flows if fire hydrants are provided. The design engineer shall consult with the local fire suppression authority regarding needed fire flows in the area under consideration. This information shall be provided to the Division. Where no local fire suppression authority exists, needed fire flows shall be assumed to be 1000 gpm unless the local planning commission provides a letter indicating that the system will not be required to provide any fire flows, in which case fire hydrants will not be allowed to be installed on any mains.

(b) If a distribution system is equipped with fire hydrants, the system shall be designed to insure that minimum pressures required by R309-105-9 exist at all points within the system when fire flows are added to the peak day demand of the system. Refer to Section R309-510-7 for information on determining the peak day demand of the system.

 

KEY: drinking water, minimum sizing, water conservation

Date of Enactment or Last Substantive Amendment: April, 2009[March 8, 2006]

Notice of Continuation: April 2, 2007

Authorizing, and Implemented or Interpreted Law: 19-4-104