MEMORANDUM DATE: February 24, 2011 TO: Jim Jordan, Ai3 Architects, LLC CC: Andrew Chagnon, P.E. – Pare Corporation FROM: Timothy P. Thies, P.E. RE: Available Fire Flow Evaluation East Bridgewater High School

PARE Project No.: 10191.01 Pare Corporation (PARE) has prepared this memorandum to summarize the results of the fire flow testing performed on February 18, 2011 at the East Bridgewater High School in East Bridgewater, MA. The testing was performed to evaluate the available fire flow from the East Bridgewater water distribution system in the vicinity of the existing high school to assist the project’s mechanical engineer with the design of the fire suppression system for the proposed high school. Personnel from the East Bridgewater Department of Public Works and the Town Engineer, Mr. John Haines, assisted PARE during the fire flow testing. Two (2) fire flow tests were performed at the locations shown on the attached Hydrant Flow Test Sketch. The flow testing locations that were used are in Bedford Street (Route 18) and Central Street and in close proximity to the proposed connections to the water system as part of redevelopment of the school site. The water main in Bedford Street is reported to be a 12” ductile iron pipe that was installed in 2009, and the water main in Central Street is reported to be a 12” asbestos cement pipe. The results of the tests are summarized in Table 1.

Table 1. February 18, 2011 Hydrant Flow Test Results

Test No. 1 (10:00 am – 10:30 am) Test No. 2 (10:30 am – 11:00 am)

Hydrant Static Pressure

Residual Pressure

Observed Flow Rate

Static Pressure

Residual Pressure

Observed Flow Rate

Flow 87 psi 78 psi 1,190 gpm 71 psi 61 psi 1,060 gpm Residual 86 psi 82 psi n/a 65 psi 61 psi n/a The results of the hydrant flow testing and the calculations prepared by PARE are representative of the conditions in the water system at the time of the testing. Specifically, DPW personnel assisting PARE with the tests indicated that a pump was operating from one of the Town’s well stations at approximately 400 gpm during the flow testing. There are two well station/treatment facilities in the Town’s water system, and the pumping rate of the other station is approximately 700 gpm. This station was not on-line at the time of the hydrant flow testing according to DPW personnel. Both of

Mr. Jim Jordan, Ai3 Architects, LLC February 24, 2011 Page 2

the stations are south of the school, and treated water is pumped from each station to a 1.5 million gallon storage tank located to the north of the school. PARE also estimated the flow rate anticipated to be available for fire flow while maintaining a residual pressure of 20 psi based on the results of each flow test. These calculations were performed in accordance with the American Water Works Association (AWWA) Manual M32 – Distribution System Analysis for Water Utilities, which states that “it is generally acceptable to maintain system pressures of 20 psi” during fire flow demand calculations. The results of these calculations are summarized in Table 2. Hydrant flow test reports showing these calculations are also attached.

Table 2. Fire Flow Available at 20-psi Residual Pressure

Flow Rate Observed During Test

Residual Pressure Observed During Test

Flow Rate Estimated at 20-psi Residual Pressure

Hydrant Test #1 1,190 gpm 82 psi 5,407 gpm Hydrant Test #2 1,060 gpm 61 psi 3,917 gpm

The flow rates estimated for a 20-psi residual pressure presented above are theoretical values. They may not reflect what would be available during a fire event at the site due to the limitations of the fire hydrants. It is likely that more than one hydrant would need to be opened to obtain the flow rates indicated in Table 2. It should also be noted that the results presented do not account for any of the modifications proposed to the water distribution system on the school site. Additional analysis would be required to evaluate the impact that the proposed on-site water distribution system modifications may have on the available fire flow at the school. Please contact Andrew Chagnon or myself should you have any questions or require additional information, thank you. - TPT G:\10191.00 East Bridgewater, MA Hydrogeological Evaluation\Hydrant Flow Testing\Fire Flow Testing Memorandum.doc

HYDRANT FLOW TEST REPORT #1 EAST BRDIGEWATER HIGH SCHOOL

Location: Bedford Street (Route 18) Date: February 18, 2011

Test Made By: East Smithfield DPW Time of Test: 10:00 – 10:30 AM +/-

On Site: Brandon Blanchard, Tom Perry (PARE); Jim Haines (East Bridgewater Town Engineer);

Personnel (4) from East Bridgwater Department of Public Works

Purpose of Test: Estimate the available fire flow in Bedford Street outside of the East Bridgewater High

School site

Consumption Rate During Test 1: 1,190 gpm at 4 min = 4,760 gal.

If Pumps Affect Test, Indicate Pumps Operating: According to East Bridgewater DPW, one pump was

running at approximately 400 gpm during test.

Test Results Flow Hydrant: Static: 87 psi Residual Hydrant: Static: 86 psi

Size Nozzle: 2½ inch Residual: 82 psi

Residual Reading: 78 psi

Flow Rate: 1,190 gpm (50 psi)

Calculation of Available Flow at 20 psi (QR)

QF = 1,190 gpm (flow rate observed during test)

hR = 86 – 20 = 66 psi

hF = 86 – 82 = 4 psi

QR = QF * (hR0.54 / hF

0.54) = 1,190 * (66 ^ 0.54) / (4 ^ 0.54)

QR = 5,407 gpm

Note: Flow hydrant located near entrance to school property along east side of Bedford Street.

Residual hydrant to the south and on opposite (west) side of Bedford Street.

Report by: Brandon M. Blanchard, P.E.

HYDRANT FLOW TEST REPORT #2 EAST BRDIGEWATER HIGH SCHOOL

Location: Central Street & Plymouth Street Date: February 18, 2011

Test Made By: East Smithfield DPW Time of Test: 10:30 – 11:00 AM +/-

On Site: Brandon Blanchard, Tom Perry (PARE); Jim Haines (East Bridgewater Town Engineer);

Personnel (4) from East Bridgwater Department of Public Works

Purpose of Test: Estimate the available fire flow in Central Street and Plymouth Street near East

Bridgewater High School

Consumption Rate During Test 1: 1,060 gpm at 4 min = 4,240 gal.

If Pumps Affect Test, Indicate Pumps Operating: According to East Bridgewater DPW, one pump was

running at approximately 400 gpm during test.

Test Results Flow Hydrant: Static: 71 psi Residual Hydrant: Static: 65 psi

Size Nozzle: 2½ inch Residual: 61 psi

Residual Reading: 61 psi

Flow Rate: 1,060 gpm (40 psi)

Calculation of Available Flow at 20 psi (QR)

QF = 1,060 gpm (flow rate observed during test)

hR = 65 – 20 = 45 psi

hF = 65 – 61 = 4 psi

QR = QF * (hR0.54 / hF

0.54) = 1,060 * (45 ^ 0.54) / (4 ^ 0.54)

QR = 3,917 gpm

Note: Flow hydrant on Central Street near Town Hall. Residual hydrant at intersection of Central

Street and Plymouth Street at Town Common.

Report by: Brandon M. Blanchard, P.E.