eastham water system water supply investigations status update board of selectmen september 21, 2009

Project Coordination ActivitiesProject Coordination Activities

Meeting with Cape Cod National Meeting with Cape Cod National Seashore –Seashore – August 27 August 27

Cape Cod Commission Cape Cod Commission USDA Meeting – September 16USDA 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 SchoolHydrogeologic Conditions

Deep boring installed to 400’

Water table at 50’

Good material to 105’Silts and clays below

Installed well at 90’

District H District H

District HDistrict HHydrogeologic Conditions Summary Hydrogeologic Conditions Summary

Deep boring: 405’ bgsDeep boring: 405’ bgs DTW – 30’ bgsDTW – 30’ bgs Potentially productive zones:Potentially productive zones:

Shallow 106-116’ bgsShallow 106-116’ bgsIntermediate 207-217’ bgsIntermediate 207-217’ bgs

Freshwater/Saltwater Interface 343 feetFreshwater/Saltwater Interface 343 feet

District HWell Installations

Deep well: 346’Deep well: 346’

Intermediate well: 207’ Intermediate well: 207’

Shallow well: 116’Shallow well: 116’

District H

Well Development

District H

Well Development

District H Drill Log

Potentially productive aquifer zone (sand) 80-218’

Fresh Water/Salt water interface: 143’ bgs

Specific Capacity Shallow: 33 gpm/ft Intermediate: 5-10+ gpm/ft

Water quality: Shallow – excellentIntermediate – Waiting on data

Silt and Clay

Sand

Fresh WaterSalt Water

District HDistrict HHydrogeologic IssuesHydrogeologic Issues

Response of salt water transition zone Response of salt water transition zone with pumpingwith pumping

Proximity of vernal poolsProximity of vernal pools Groundwater/vernal pool interactionGroundwater/vernal pool interaction

District H Deep Test Well

19.00

19.25

19.50

19.75

8/27/09 8/28/09 8/29/09 8/30/09 8/31/09 9/1/09 9/2/09 9/3/09 9/4/09 9/5/09

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 GDrill 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

8 15 22 29 6 13 20 27 3 10 17 24 31 7 14 21 28 5 12 19 26 2 9 16 23 30 7 14 21 28 4 11 18 25 1 8 15 22 1 8 15 22 29

Phase I Tasks

Task 1. Project and Regulatory Coordination

Task 2. Orleans Water Source Feasibility Study

Task 3. Site Survey

Task 4. Initial Site Investigations

Nauset Regional High School

District H

District G

Task 5. Groundwater Modeling

Task 6. Request for Site Exam

Nauset Regional High School

District H

District G

Task 7. Request Approval to Conduct Pump Test

NovemberOctober FebruaryDecember2009 2010

Project Task June JanuaryJuly August MarchSeptember

Discussion