Projected Use of Innovative/Alternative On-site Sewage Treatment Systems in Eastham, Under Current Regulations and Policies. Susan Rask Barnstable County Department of Health and Environment. Project funded by Barnstable County Wastewater Implementation Committee (WIC). Project Goals.
Projected Use of Innovative/Alternative On-site Sewage Treatment Systems in Eastham, Under Current Regulations and Policies
Department of Health and Environment
A public water supply is any well that serves more than 25 people for more than 60 days per year
In Eastham, most are Transient, Non-Community wells at restaurants and motels
RESULTS:I/A projected on
Parcels <10,000 s.f. = 276 I/A projected
Shown in pink on Map 2
Parcels >10,000 but <20,000 s.f. := 282 I/A projected
Shown in blue on Map 2
Parcels > 20,000 s.f. = 0 I/A projected
but these parcels were examined under Criteria 3 to see if they met 440 gpd/acre standard
On residential lots with well and septic, Title 5 allows
440 gpd/acre = 4 bedrooms/acre
or 2 bedrooms/0.5 acre, etc.
i.e. 1 bedroom per 10,000 s.f. lot size
Note: New Construction = addition of new design flow
Drinking wells intercepting plume at different distances from plume source and therefore showing different concentrations of nitrate
Current Eastham Drinking Well Results
90 lots shown in pink on Map 4
45% of total parcels in town exceed 4 BR/acre or 440 gpd/acre guideline (this doesn’t include analysis of commercial flow vs. lot size)
45% of total parcels in town exceed 4 BR/acre or 440 gpd/acre guideline
i.e. How much money would I have to set aside today to cover all costs associated with the system over it’s life span?
Yields present value of roughly $35,000.
I/A unit $10,000
Title 5 components $10-20,000
Brings total initial cost to $20-30,000
Brings present value cost to $45-55,000
i.e. Water In = Water Out
Average TN=18.4 median=15.2 mg/L
66% of samples met 20 mg/L limit but 33% did not