Presentation to PlymouthCarver Aquifer Advisory Committee

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Presentation toPlymouth-Carver Aquifer Advisory
Committee

• Technical Memorandum 1
• CT-ENV-12210600000000002210

February 8, 2006
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Outline

• 1.0 INTRODUCTION
• 1.1 Background
• 1.2 Hydrogeology of PCA Area
• 1.3 Forecasts for PCA
• 2.0 PCAAC
• 2.1 Formation
• 2.2 Legislative Mandate
• 3.0 INTERVIEWS
• 3.1 Methodology
• 3.2 Interviewees
• 4.0 MUNICIPAL DOCUMENT REVIEW
• 5.0 LITERATURE REVIEW
• 4.1 Bylaws and Other Enforceable Policy
• 4.2 Intergovernmental Approaches
• 4.3 Protection Plans
• 4.4 Performance Standards
• 4.5 Findings and Recommendations

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INTRODUCTION
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INTRODUCTION
5
INTRODUCTION

• Rate of development is a ?

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PCAAC

• Formation
• Legislative Mandate

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INTERVIEWS

• Methodology
• Interviewees

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MUNICIPAL DOCUMENTS
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Soil Erosion Sediment ControlSand Gravel

• Vertical separation from groundwater
• Avoidance of steep slopes
• Restoration
• Prohibition of sand and graveling

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Stormwater

• Massachusetts Stormwater Manual
• No net increase in volume or rate from 1, 10, 25,
  50, and 100 year storms
• Reduction of impervious surface
• Recharge

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Water Supply

• Many significant increases planned
• Wells to the south have much better yields

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Wastewater

• No onsite OM requirements.
• Nitrate management in Bourne
• 10 PPM
• 42 inches of rain
• 0.6 lbs fertilizer per sqft
• Application rates per Table 7

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Wastewater

• Nitrate management in Plymouth
• BOD 10 PPM
• Suspended solids 10 PPM
• Phosphorus 1 PPM
• Nitrogen 5PPM
• 200 colonies/100ml
• Plympton effective 5ac zoning

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LITERATURE REVIEW

• Bylaws and Other Enforceable Policy
• Intergovernmental Approaches
• Protection Plans
• Performance Standards

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Spectrum of Options

• Fewer Restrictions
• People Get to Do What They Want

Efficiency Consistency

• Allow Development to Run Its Course.
• Work Separately to Control Development.
• Work Together to Establish Consistent and
  Appropriate Development Standards.
• Establish a Regional Authority.

Comfort Ease

• Better Planned Development
• Strong Resource Protection
• Higher Sustainability

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Bylaws and Regulations
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Performance Standards

• NITROGEN DISCHARGE CONCENTRATION
• 5 mg/l from any land use
• STORMWATER QUANTITY
• Reduction of 80 percent of total suspended solids
  from discharge.
• No net increase in peak flows or volume from 2-,
  10-, 25-, and 100-year storms.
• Maximize recharge to the extent possible.
• SOIL EROSION AND SEDIMENT CONTROL
• 80 percent reduction of total suspended solids.
• Avoidance of steep slopes (e.g., 15 percent
  grades or greater).
• Phasing projects to avoid overstripping plant
  cover.
• LAND USE DENSITY
• Cluster zoning.
• Special land-use densities in village centers.
• WATER WITHDRAWAL
• Allocations for water withdrawal.