Presented by Fred Barker, P.E., MassDEP Boston Massachusetts Department of Environmental Protection Drinking Water Program

Chapter 8 – Finished Water Storage Tanks shall be designed to facilitate turnover in 3- 5 days Tank Inspections * Monthly ground level inspection * Annual roof top inspection * Comprehensive interior/exterior inspection every 3-5 years 2

Chapter 8 (cont.) Design standards have been updated * 6-foot fencing required * locks and alarms against trespassing Tank overflow pipe shall have 24-mesh screened outlet and internal 4-mesh screen upstream 3

Overflow Outlet with #4 Screen 4 Photos Courtesy of Haley and Ward, Inc.

Chapter 8 (cont.) Access manhole required that is at least 4 inches above the roof Ground level structures shall have access manhole at least 24 inches above the roof or finished grade level 5

Chapter 8 (cont.) Valve pit shall be provided with: * proper sampling tap * injection point for disinfection Vents shall open downwards and have 4-mesh or finer screen Roof shall be water-tight and sloped 6

Chemical Injection Nozzle Assembly 7 Pipe Cross C

Broken Roof Vent Screen Modern Larger Roof Vent Photos Courtesy of Haley and Ward, Inc. 8

Chapter 8 (cont.) Acceptable construction materials and standards are identified Safety and tank access shall be provided using ladders, guards, cages, and railings that meet OSHA standards 9

Ladder Within Access Tube Ladder with No Safety Accessories Photos Courtesy of Haley and Ward, Inc. 10

Chapter 8 (cont.) Anchor bolt devices shall be provided for rooftop inspections Riser pipes, overflows, and vents shall be designed to be prevent freezing Painting systems shall conform to AWWA specifications and NSF 61 Cathodic protection is recommended 11

Fall Restraint/Arrest Roof Anchor Photos Courtesy of Haley and Ward, Inc. 12

Chapter 8 (cont.) Tanks shall be properly disinfected and the chlorinated water must be disposed of properly Antennae on tanks shall conform to DWP Policy and not interfere with access by the water department 13

Chapter 9 – Distribution System Piping Temporary Piping * Shall meet NSF 61 and AWWA stds. * Shall be disinfected An annual unidirectional flushing program is recommended to maintain water quality 14

Chapter 9 (cont.) System Design * Pipe coatings and linings shall meet standards * System components shall meet NSF 61 (Annex G) * Dead ends shall be minimized by looping 15

Chapter 9 (cont.) System Design * Selection of pipe materials should consider if the area is subject to permeation by organic solvents * Systems without fire protection shall use 3-inch minimum pipe diameter 16

Chapter 9 (cont.) System Design * Areas with poor water quality should be flushed twice each year Hydrants & Air Relief Values * Hydrant antifreeze now specified * Use of manual air release valves is recommended 17

Chapter 9 (cont.) Water and sewer pipe crossings shall use sewer pipe rated for 150 psi within 10 feet of the water main All service connections should be metered individually Distribution system repairs shall be performed in accordance with AWWA standards 18

Any Smoking Questions??? 19

Contacts Boston - Fred Barker, P.E., Boston – Yvette DePeiza CERO - Purna Rao NERO – Sean Griffin SERO - Dan DiSalvio WERO – Mike McGrath MassDEP Drinking Water Program Director at Attn: Guidelines 20

The End 21