HomeMy WebLinkAboutNORTHBIRD S-11857Northbird
511857
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHOP~GE, AK 99524
522-7773 677-7766 (FAX)
August31,2011
Municipality of Anchorage
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject:
Lots 1 through 3, Northbird Subdivision, S-11857-1
Water Availability Study
Dear Debbie:
A new Class C Well and Water System was recently constructed to serve the proposed
three lots of Northbird Subdivision. The location of the well is shown on the drawing
previously submitted. This well is 348' deep with casing the entire depth. The static
water level is at the surface and the well will require an artesian plug. The well log
indicates the well produces in excess of 100 gallons per minute.
It is my understanding the well will not be in service until after Northbird Subdivision is
platted and construction on the individual lots begins.
Sincerely,
Michael E. Anderson, P.E.
Attachments
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
622-7773 677-7766 (FAX)
July 13, 2011
Municipality of Anchorage
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Su~e~:
Lots 1 through 3, Northbird Subdivision, S-11857-1
Water Availability Study
Dear Debbie:
The proposed Northbird Subdivision is surrounded by the AWWU sewer system
throughout the entire area. Lots 1 through 3 will be served by AWWU sewer. The
majority of the lots in the area are served by wells that were developed many years ago.
We have made an exhaustive search, but have been unable to retrieve any information
either from the Municipal files or from the State of Alaska Department of Environmental
Conservation (ADEC). Our inventory however has revealed that the majority of the
wells are artesian and provide more than sufficient water to support the houses in the
area.
The area surrounding the proposed subdivision is currently served by a Class C Well
located on Lot 3. This well is controlled by a loosely formed homeowners association
and is located on land owned by the City. The ownership of the well is currently in
doubt, but maintenance is provided by the homeowners in the area. In addition, the
subdivision is close to Campbell Creek to the north which may add to the recharge of
the aquifer and explain the occurrence of the artesian wells in the area.
We recently completed a well flow test on the Class C Well. Unfortunately we were
unable to determine the depth of the well or complete a thorough inspectibn as the
ownership of the well is in doubt and we were unable to obtain permission to gain
entrance to the well house. The test was completed on the house currently in place on
Lot 3 of proposed Northbird Subdivision. Water was allowed to run freely from the hose
I~ots I - 3, Northbird Subdivision
July 13, 2011
Page 2
bib connected to the plumbing and measured with a water meter over time. A copy of
the field data is attached. The test was run for a period of four hours with an average
flow Of 14.9 gallons per minute. It is obvious based on the methodology of the test that
the well probably produces well in excess of this quantity of water.
A new Class C Well and Water System will be constructed to serve the proposed three
lots of Northbird Subdivision. The location of the well is shown on the attached drawing.
This well will only serve the three lots in the subdivision. Our study of the wells in the
area indicate this well will probably be artesian be placed to a depth of less than 200'.
The well will probably be founded in loose gravel formations. No bedrock should be
encountered as no evidence of bedrock was noted in the area. The production rate will
approach 15 gallons per minute and be sufficient to support three four bedroom homes
which will probably be constructed on the three lots in Northbird Subdivision in the
future.
Sincerely,
Michael E. Anderson, P.E.
Attachments
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