045
PAGGI. MARTIN & DEL BENE LLP
Consulting Engineers & Land SUT'Oeyors
fJL/5
,I
54-56 Main Street
Poughkeepsie, New York 12601
914-471-7898
914-471-0905 (FAX)
Dutchess County Health Department
387-391 Main Mall
poughkeepsie, New York 12601
RECEIVED
AUG 1 6 1999
ELAINE SNOW
TOWN DEN
CLPRK
August 11, 1999
Attention: Daniel O'Connor, P.E.
Reference: Proposed Wappinger Water Improvements-1999
Dear Dan:
Enclosed please find a brief Engineer's Report describing the necessary proposed
improvements to be made to the Central Wappinger Water Improvement and
North Wappinger Water Improvement to maintain service to the existing residents.
As you are aware, the most recent drought has caused a decline in the
productivity of Hilltop wells to the extent that the Hilltop source can no longer
supply the residents of the Central Wappinger Water Improvement.
As you are also aware, we have recently experienced structural problems in the
two (2) storage facilities of the Central Wappinger Water Improvement (i.e. Hilltop
Storage Facility and the Rockingham Storage Facility).
It is proposed to do a three (3) phase series of improvements to the Town's water
systems to improve the reliability of the source, storage and distribution system.
The first phase is to help the Town through the immediate emergency that has
been declared by Supervisor Constance O. Smith.
As you are aware, the Hilltop wellfield is declining on a daily basis and at the time
of this writing, is not able to supply the average daily demand. For the last day,
we have been utilizing the Pizzagalli Interconnection to the extent possible, but as
you are also aware, that is limited by the amount of water the existing Atlas wells
can produce.
To that end, the Town has authorized the emergency drilling of two (2)
production wells at the Atlas Wellfield, and tying into the existing distribution
system of the North Wappinger Water Improvement. This should allow the
Pizzagalli Interconnection to operate to its originally designed capacity of 400
GPM. Utilizing the interconnection to that extent will allow the Hilltop wellfield to
rest and maintain itself at a more stable level. We hope that that will get us
through the present emergency period.
Joseph E. Paggl, Jr., P.E.
Ernst Martin, Jr., P.E., L.S.
Charles R. Del Bene, Jr., P.E.
Mr. Daniel O'Connor
RE: CWWI Improvements
- 2 -
August 11, 1999
The next phase will add a number of other improvements itemized in the
Engineer's Report that will improve the overall capabilities of the system, and will
allow the existing Hilltop source to have the ability to utilize the more dependable
Atlas Wellfield. We will also in that proposal have a redundant tank on the Hilltop
site in the event that there are additional structural failures to this facility. This
phase is planned to be done within the next year, and will hopefully be service
prior to the summer months of the year 2000.
The third and final phase is for treatment facilities, distribution, system
reinforcement, etc. That is also detailed in the Engineer's Report. A time
schedule for this phase is not known as we speak.
As you can see, I have also included a site plan showing the first two (2) wells
that will be drilled at Atlas, and a cross-section of the proposed wells that will be
installed at this site.
If you require further information, please do not hesitate to contact this office.
Very truly yours, /J. '4;).
I) ~.~.
./ C:~yl/--' IOf .
Joseph E. Paggi, Jr., P.E.
JEP:law
Enclosure
cc: Hon. Constance O. Smith, Supervisor w/enclosure
Hon. Vincent Bettina, Councilman w/enclosure
Hon. Joseph Paoloni, Councilman w/enclosure
Hon. Joseph Ruggiero, Councilman w/enclosure
Hon. Robert Valdati, Councilman w/enclosure
Hon. Elaine Snowden w /enclosure
Albert P. Roberts, Esq. w/enclosure
Michael Tremper w/enclosure
Michael Merriman w/enclosure
ENGINEER'S REPORT
WAPPINGER WATER IMPROVEMENT - 1999
No.1&. No.2
PREPARED FOR:
TOWN BOARD
TOWN OF WAPPINGER
20 MIDDLEBUSH ROAD
P.O. BOX 324
WAPPINGERS FALLS, NEW YORK 12590
AUGUST 11, 1999
PREPARED BY:
PAGGI, MARTIN &. DEL BENE LLP
CONSULTING ENGINEERS &. LAND SURVEYORS
54-56 MAIN STREET
POUGHKEEPSIE, NEW YORK 12601
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4lJS 1 G t:D
Sl..4ltv 1999
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BACKGROUND:
The Town of Wappinger currently owns, operates and maintains numerous water
districts within the central portion of the Town.
The largest district is the Central Wappinger Water Improvement (CWWI), which
was authorized by the Town Board in 1973. The sources for the CWWI are two
(2) well fields located on the Sprout Creek recharged by the Sprout Creek Aquifer.
They are the Hilltop Wellfield and the Rockingham Wellfield. It has been
demonstrated historically and substantiated professionally by the Dunne
GeoScience Report that the well fields are effected by seasonal drought
conditions that exist in the Sprout Creek and, as such, are not able to meet
average daily demands during these time periods.
With that in mind, the Town purchased the privately held Atlas Water Company in
1991 and formed the North Wappinger Water Improvement (NWWI). Of
significant importance here was the purchase of 11 acres of land along the
Wappinger Creek that was envisioned to provide a central water source for the
Town. The Town had a detailed aquifer capacity analysis done by Leggette,
Brashears & Graham in 1995. This report indicated that the safe yield for the
Atlas Wellfield was in the neighborhood of 1,500 GPM. This flow was calculated
using drought conditions with very little recharge from the Wappinger Creek.
There were four (4) existing water districts, which purchased the Atlas Water
Company in 1991. These included the following:
. North Wappinger Water Improvement
. Central Wappinger Water Improvement
. Cranberry Hills Water Improvement
. Myers Corners II Water District
CURRENT CONDITIONS:
During the last week of July 1999, a leak developed in the Rockingham Water
Storage Facility of the Central Wappinger Water Improvement. While repairing
that leak, another leak also developed at the Hilltop Water Storage Facility of the
same Improvement. The repairs were made on an emergency basis, and the
tanks now are not leaking. The tank repair company has informed us that the
work that was done on the tanks should be considered temporary and not
permanent. It was also stated to us that the general overall condition of the
tanks was from fair to poor.
We are also currently in a state of a drought emergency in the Town of
Wappinger. The levels of the Hilltop and Rockingham wells have been dropping
steadily as the duration of the drought increases. Most recently, in conversations
with the operator, it has been brought to my attention that the wells at the Hilltop
source have had to have been cut back to a lower flow to allow pumping levels to
remain above the screen.
- 1 -
Sprout Creek is for all intents and purposes dry, and the well field is operating at
about 35% capacity.
As of the writing of this report, the Central Wappinger Water Hilltop wells are not
able to meet the average daily demand of that portion of the system.
To that end, the operators of the system, Camo Pollution Control, has started the
Pizzagalli Booster Station, which is located on the interconnecting line between
the distribution system of the North Wappinger Water Improvement and the
Central Wappinger Water Improvement. This interconnection was originally
designed to allow the flow of 400 GPM from North Wappinger to Central
Wappinger, however, the decline of the North Wappinger wells presently
precludes that from happening.
The operator has determined that they can pump a maximum of approximately
150 GPM from North Wappinger to Central Wappinger for short periods of time
during the day without having severe negative effects on the distribution system
of North Wappinger Water. This is being done as we speak to augment the flow
to the Hilltop system.
With the above in mind, on August 4th, 1999, the Town Board adopted a
Resolution to allow the drilling of two (2) wells at the Atlas Wellfield and placing
these wells into service to allow the Pizzagalli Interconnection to be able to
operate as close as possible to it's design flow (i.e. 400 GPM). This Resolution
was adopted with the understanding that Camo Pollution Control and our office
had confirmed the severity of the drought conditions and, in writing, indicated to
the Town Board that an emergency condition exists, and immediate action by the
Town will need to be taken for the general health, safety and welfare of the
residents.
The Town Board also authorized any necessary modifications to the Pizzagalli
Interconnection to allow the transfer of this water from North Wappinger Water to
Central Wappinger.
The total costs for the new wells, appurtenances and modifications to the
Pizzagalli Interconnection will not exceed the total of $500,000.00.
PROPOSED PHASE II IMPROVEMENTS:
It is proposed under Phase II to make certain improvements to provide an
additional source of water to the Central Wappinger Water Improvement and to
further provide better, more stable service to the North Wappinger Water
Improvement. It is also the goal of this improvement to allow the supply to the
Cranberry Hills Water Improvement and reinforce the supply to the Myers Corners
II Water District.
- 2 -
Earlier in 1999, we had made a proposal to the Town of Wappinger for the
Combined Wappinger Water Improvement, which had a project cost of
approximately $18,000,000.00. This detailed numerous items that were to be
constructed in the Town and was an ultimate goal and plan for the Town of
Wappinger. We are now proposing that certain items of work be done to meet
the immediate (1 year approximately) goals and design and construct these items
in a manner that they would be able to be incorporated into the larger overall
Improvement without modifications. These improvements would be:
~ Completion of the Atlas Wellfield for up to five (5) wells, including appropriate
well pumps and necessary controls.
~ Dedicated tank line between the Atlas Well field and the Hilltop Water Storage
facility.
~ Retro-fitting the Pizzagalli Interconnection to become a pressure reducing
station to backfeed the North Wappinger Water District.
~ Construction of a clear well at the Atlas site, including hi-lift pumping that will
transport the water through the dedicated tank line to the Hilltop Water
Storage facility.
~ An appropriately sized, Phase 1, water storage facility at the Hilltop site
(approximate size one million gallons).
~ Tele-metering and control work between the Hilltop site and the Atlas
Wellfield.
Total project costs, including hard and soft costs, for the above is
$5,750,000.00. There are approximately 5,000 benefit units in the Central
Wappinger Water Improvement, North Wappinger Water District, Myers Corners II
Water District, Cranberry Hills Water Improvement and the Ardmore Hills Water
Improvement. These existing users are to pay for the $5,750,000.00
Improvement.
- 3 -
ULTIMATE PHASE III IMPROVEMENTS:
It should be noted that there is additional work that would be necessary to be
done to accomplish the entire Proposed Combined Wappinger Water Improvement
as previously discussed with the Board.
The items that would remain to be done would be:
. Additional well at the Rockingham Wellfield.
. A booster station on Cedar Hill Road.
. An additional pressure reducing station going down to the North Wappinger
Water system.
. Distribution reinforcements along Myers Corners Road and All Angels Hill
Road.
. The Atlas Filtration Plant.
. The Rockingham and Hilltop Chlorine Detention Facilities.
. Cedar Hill Storage Facilities.
. Additional storage facilities at the Hilltop site.
The above does not include tying in of any of the satellite districts, including
Oakwood and/or Wappinger Park. This has been discussed by the Board, but is
not part of this proposal.
The thrust of this proposal is to perform the above work, which is felt necessary
to be done to remove the emergency status of the Central Wappinger Water
Improvement as it relates to source capacity and storage capacity.
FLOODPLAIN MANAGEMENT:
It would appear from the updated Flood Insurance Rate Maps (FIRM) that the
100-year floodplain in the area of the Atlas Wellfield is between elevation 100 at
the southern end of the wellfield to 104 at the north end of the wellfield.
With that in mind, it is recommended that all improvements be constructed three
foot above the 100 flood elevation or to an elevation of 107.
Although the floodplain elevation has been lowered somewhat this appears
consistent with the floor elevation of production Well No.1, which is at elevation
105.6.
- 4 -
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