1. Investigation of District Package Treatment Plants
West Newbury Working Group
December 4, 2017

2. Agenda Process to Date Build-out Scenarios
Assumptions
Results
Options for Potential Package Treatment Plant
Size
Location
Financing
Next Steps
Discussion
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

3. Process to Date

4. Why Evaluate Sewage Treatment Options?
Constraint on economic development in the Town Center
Difficulty/inability to replace systems that fail
Title V-compliant systems may prohibit/make certain uses more difficult
Land used for leach fields is land that cannot be used for buildings, parking, or amenities
Constraint on additional housing in the Town Center
Title V-compliant systems limit density
Land is devoted to septic systems rather than buildings
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

5. Working Group Meetings
July 27
Introduction to study process
Discussion of West Newbury’s needs, possibilities, and concerns
September 29
General information about sewage treatments – systems, management, financing, operating structures
Specific information about West Newbury and the potential implications
Resources and case studies for review
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

6. Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
September 28, 2017
Build Out Analysis

7. Four Scenarios Base Case Scenario: Town Center as service area
Base Case Scenario: Town Center with additional 4 parcels as service area
Scenario A: Mixed Use Town Center
Scenario B: Mixed Use Town Center and Expanded Service Area
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
September 28, 2017

8. Estimating the Current and Future Flows
91 total parcels with 25 unique property descriptions
Actual usage values wherever possible
For everything else, usage was estimated by pairing property descriptions with the most relevant Title V Criteria and its corresponding Design Flow
Any assumption moved towards greater estimated use, e.g. Single-Family homes were assumed to have 4 bedrooms (440 GPD), rather than three (330 GPD).
Sample Pairings (Assessor = Title V)
Single Family Residential = Family Dwelling, Single (110 GPD per Bedroom, min. flow: 330 GPD)
Developable Residential Land = Family Dwelling, Multiple (110 GPD per Bedroom, min. flow: 330 GPD)
Medical Office Building = Doctor’s Office (250 GPD per Doctor)
Auto Repair Facilities = Service Station, No Gas (150 GPD per Bay)
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

9. Base Case Scenario: Town Center
Total No of Parcels: 20
Betterment Units: 24
Estimated Current Flow: 8,881GPD
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

10. Base Case Scenario: Town Center+
4 parcels that are likely to be developed:
360 Main Street (“Mullen Property”)
34.19 acres (2 Parcels)
Map R10, Lot 33 and 42A (“Daley Property”)
8.5 acres (plus land outside center)
317 Main Street (“Dunn Property”)
14.78 acres
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

11. Base Case Scenario: Town Center+
360 Main Street (“Mullen Property”)
+ 34 Betterment Units (33 2-BR and 1 1-BR)
+ 7,400 GPD
Most aggressive scenario. Estimate is from a soil and percolation test dated 7/13/2005.
317 Main Street (“Dunn Property”)
+ 15 Betterment Units
+ 7,040 GPD (16 units x 4 bedrooms per unit x 110 gallons per day per bedroom)
Estimate was created by dividing the lot area (643,000 SF) by minimum lot size in Residential C district.
Map R10, Lot 33 and 42A (“Daley Property”)
+ 34 Betterment Units
+ 14,960 GPD (34 units x 4 bedrooms per unit x 110 gallons per day per bedroom)
Estimate was created with a unit count provided by the Town staff. This count assumes the development of a connected acre parcel that is not within the current study area.
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

12. Base Case Scenario: Town Center+
Total No of Parcels: 24/25
Betterment Units: 107(additional 83 Betterment Units)
Estimated Future Flow: 37,841GPD
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

13. Scenario A: Mixed Use Town Center
Total No of Parcels:20
Betterment Units: 31
Estimated Future Flow: 10,281GPD
Of the 20 parcels, just 7 are residential and could therefore accommodate further retail use.
Study assumes that all ground floor SF is newly dedicated to retail uses (50 GPD per 1,000SF, minimum: 200 GPD) but residential BR counts stay consistent
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

14. Scenario B: Mixed Use Town Center+
Total No of Parcels: 91
Betterment Units: 190
Estimated Future Flow: 73,430 GPD
Assumes Town Center parcels allow mixed use, sewage district expands to Bachelor Street in east, Newell Farm Drive in west and to Maple Street in South
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

15. Scenario Summary Totals (GPD) Base Case: Town Center
and Developable Parcels
Scenario A:
Mixed Use Town Center
Scenario B:
and Expanded Sewage District
Total No of Parcels 20
24/25 91
Betterment Units 24
107 31
190
Usage Flow (GPD)
8,881
37,841
+10,281
73,430
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

16. Massachusetts Regulatory Context
State Environmental Code, Title 5 (310 CMR 15.00)
Systems with design flows less than 10,000 gallons per day
10,000 gallons =~ 30 3-bedroom units or 200,000 square feet of retail space
Two types:
Individual houses or commercial properties
Shared or cluster systems up to residences
Administered by the Board of Health
Setbacks from wetlands and waterways, soil requirements and depth to groundwater requirements
Innovative/Alternative Septic Technologies
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

17. Scenario Summary Totals (GPD) Base Case: Town Center
and Developable Parcels
Scenario A:
Mixed Use Town Center
Scenario B:
and Expanded Sewage District
Total No of Parcels 20
24/25 91
Betterment Units 24
107 31
190
Usage Flow (GPD)
8,881
37,841
+10,281
73,430
Suggested Systems
Cluster Systems
Satellite System
Cluster system--serving nearby properties with an aggregate flow less than 10,000 gallons per day (gpd), roughly equivalent to 30 three-bedroom homes.
Satellite system--serving an area of a town with an aggregate flow greater than 10,000 gpd (and thus requiring a DEP groundwater discharge permit), and as much as 300,000 gpd.
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

18. Construction Costs: $ per gpd of Capacity
Based on Comparison of Costs for Wastewater Management Systems Applicable to Cape Cod – April 2010 (ENR Construction Cost Index of 8600)
10,000 gpd: $70 per gpd of design flow ($87 per gpd – May 2017)
100,000 gpd: $35 per gpd of design flow ($44 per gpd – May 2017)
1,000,000 gpd: $17 per gpd of design flow ($21 per gpd – May 2017)
May 2017 costs based on ENR Construction Cost Index of 10692
gpd = gallons per day
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

19. Construction Costs: $ per gpd of Capacity
$49 ($61 – 2017 $)
$39 ($48 – 2017 $)
Source: Comparison of Costs for Wastewater Management Systems Applicable to Cape Cod. – April 2010 (ENR Construction Cost Index of 8600)
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

20. O&M Costs: $/Yr gpd of Actual Flow
Based on Comparison of Costs for Wastewater Management Systems Applicable to Cape Cod. – April 2010 (ENR Construction Cost Index of 8600)
10,000 gpd: $13 per gpd of average flow ($17 per gpd – May 2017)
100,000 gpd: $5 per gpd of design flow ($7 per gpd – May 2017)
1,000,000 gpd: $2 per gpd of design flow ($3 per gpd – May 2017)
May 2017 costs based on ENR Construction Cost Index of 10692
gpd = gallons per day
O&M = Operations and Maintenance
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

21. O&M Costs: $/Yr gpd of Actual Flow
$9 ($12 – 2017 $)
$7 ($9 – 2017 $)
Source: Comparison of Costs for Wastewater Management Systems Applicable to Cape Cod. – April 2010 (ENR Construction Cost Index of 8600)
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

22. Order of Magnitude Cost Estimates:
Unit
Unit Price
Base Case:
: Town Center
Tow::n Center
and Developable Parcels
Scenario A:
Mixed Use Town Center
Scenario B:
Mixed Use Town Center with Expanded Sewage District
Total No of Parcels 20
24/25 91
Betterment Units 24
107 31
190
Usage Flow (GPD)
 GPD
8,881
37,841
10,281
73,430
Suggested Systems
Cluster Systems
Satellite System
System Costs $
772,895
2,305,256
894,734
3,560,399
O&M Costs
99,372
329,322
115,037
456,461
Collection System Lengths
Main Street (LF) LF
1,600
2,500
4,500
Maple Street (LF)
300
900
Disposal System Length
2,600
Order of Magnitude Cost of Collection System at $240/LF
12" Gravity Sewer
240
456,000
672,000
1,296,000
Total System Costs
1,228,895
3,601,256
1,974,734
5,480,399
System Costs/Betterment Unit
51,204
33,657
63,701
28,844
Yearly O&M Costs
4,141
3,078
3,711
2,402
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

23. Assumptions
Construction Cost Data from 14 facilities located in southeastern Massachusetts built over a 13-year period prior to 2009
Report data adjusted to make it current to 2009 based on ENR Cost Construction Index Data further projected forward to May 2017 based on ENR Cost Construction Cost Index 10692
Design flows range from 15,000 gpd to 2.3 million gallons per day (mgd)
Calculation included deriving pure construction cost of treatment, and excluding costs of collection, transport or disposal. The cost estimating procedure later adds a consistent allowance for non- construction aspects of capital cost such as design, permitting, construction phase engineering services, legal expenses and land
Cape Cod study includes the general cost of land in Construction Costs. For West Newbury the cost of may increase or reduce the construction cost based on the need to acquire land or use Town owned land
Collection system calculations assume that the system will comprise of gravity sewers. Pump Stations have been excluded from the cost
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
December 4, 2017

24. Next Steps

25. Next Steps: Massachusetts Smart Growth Toolkit
Develop a Comprehensive Wastewater Management Plan
Identify Larger Projects as Anchor Opportunities
Identify and Procure Sources of Public Funding
Provide Density Incentives Where Appropriate
Be Aware of TDML Programs and Nitrogen Sensitive Areas in Your Community
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
September 28, 2017

26. Next Steps for West Newbury
This Process
Presentation to the Board of Selectmen
Final PowerPoint; draft and final report
Future Actions
Community conversation (use materials from this process)
Determine who connects now; in the future
Evaluate options for plant type, sites, financing mechanisms
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
September 28, 2017

27. Discussion
Harriman DHCD | West Newbury: Investigation of District Package Treatment Plants
September 28, 2017