Eastham Water System Water Supply Investigations Status Update Board of Selectmen September 21, 2009.

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Presentation transcript:

Eastham Water System Water Supply Investigations Status Update Board of Selectmen September 21, 2009

Project Coordination Activities Meeting with Cape Cod National Seashore – August 27 Meeting with Cape Cod National Seashore – August 27 Cape Cod Commission Cape Cod Commission USDA Meeting – September 16 USDA Meeting – September 16

Nauset Regional High School Drill Site

Drill Site at NRHS

Mud System

Drill Cuttings - Aquifer Zone

Well Screen

Well Development

Nauset High School Hydrogeologic Conditions Deep boring installed to 400’ Water table at 50’ Good material to 105’ Silts and clays below Installed well at 90’

District H

Hydrogeologic Conditions Summary Deep boring: 405’ bgs Deep boring: 405’ bgs DTW – 30’ bgs DTW – 30’ bgs Potentially productive zones: Shallow ’ bgs Intermediate ’ bgs Potentially productive zones: Shallow ’ bgs Intermediate ’ bgs Freshwater/Saltwater Interface 343 feet Freshwater/Saltwater Interface 343 feet

District H Well Installations Deep well: 346’ Intermediate well: 207’ Shallow well: 116’

District H Well Development

District H Well Development

District H Drill Log Potentially productive aquifer zone (sand) ’ Fresh Water/Salt water interface: 143’ bgs Specific Capacity Shallow: 33 gpm/ft Intermediate: gpm/ft Water quality: Shallow – excellent Intermediate – Waiting on data Silt and Clay Sand Fresh Water Salt Water

District H Hydrogeologic Issues Response of salt water transition zone with pumping Response of salt water transition zone with pumping Proximity of vernal pools Proximity of vernal pools Groundwater/vernal pool interaction Groundwater/vernal pool interaction

District H Deep Test Well Tidal influences on water level in deep test well

Vernal Pools Single Family Residential > 80,000 sq. ft. General Business General Industrial Single Family Residential 40,000-79,999 sq. ft. Conservation/ Passive Recreation

District G Drill Site Drill site and 400’ buffer entirely within Town-owned land Currently installing deep boring Site has available land for more than one test site

Eastham Water Supply Investigations Updated Schedule

Discussion