HomeMy WebLinkAboutEQUESTRIAN HEIGHTS S-6975March 23, ].983
TO:
Planning Department
FROM:
Department of Health and Environmental Protection
SUBJECT:
CASE NO. S-6975 Bavarian Heights Subdivision
The Department has reviewed the soils data and the
proposed engineering design of drainage network and
finds the department can grant concept approval.
The design of the drainage network may ]:educe the water
table to a significant depth so lots will support: septic
system. However, to assure that all lots will support
onsi~e septic systems a monitoring program will be adopted
for twelve months. A monthly monitoring report must be
submitted to the department by the engineering firm and
substautiated by a HEP person reviewing the project.
The Department prefers using perforated PVC standpipe
I" in diameter placed at five monitoring stations in
percable and nonpercable locations with two stations in
the tract areas. Also, Gold (]reek flow change monitoring
chart be submitted before and after construction of
drainage network. If monitoring proves to be successful
percolation tests can then be renewed in all questionable
and nonpercable tests to establish leach field and
trench size.
Environmental Specialist
91.0~0 (4/7G)
& ENGINEERS, INC.
S
7125 OLD SEWARD HIGHWAY · ANCHORAGE, ALASKA 99502
March 16, 1983
Robert Robinson
Dept. of Health and Environmental
9th & "L" Street
Anchorage, Alaska 99501
Bavarian Heights Subdivision
Platting Case No. S-6175
RE:
Protection
Dear Mr. Rebinson:
Bavarian Heights subdivision is currently being review-
ed by your department for conformance with the required
environmental standards for on-site waste water disposal.
Included in the package submitted to your department was a
narrative report, percolation test data, and cross-sectional
soils profiles at various locations across this subdivision.
This letter is written to further explain our intended
methods of conformance with yeur department's policies. The
proposed drainage system of fin drains as referenced in the
narrative packet and subdivision drawings haw~ been engineer-
ed to lower the groundwater table on all of the affected
lots within this subdivision. The groundwater problems in
this subdivision presently exist in the highly permeable
sand and sandy gravel strata. Placement of these fin drains
will intercept this groundwater and re-channelize it through
the subdivision with the ultimate outfall being Gold Creek,
which is where the existing groundwater presently flows.
The engineering design for these fin drains requires
that the drain pipe be a minimum of 8" in diameter and will
be placed at the base ef the gravel stratum where this stra-
tum interfaces with the impermeable silt and clay layers
belew. The fins for the system as proposed, are available
in all lengths from 2 feet to as much as 20 feet. The sys-
tem as designed, will require that these fins extend from
the drain pipe up through the gravel stratum to the point at
which this stratum interfaces with 'the silty sand and sandy
silt layers above.
EAGLE RIVFR ANCHORAG[-' HOMER
(907) 694-9846 (907) 349.6561 (907) 235-8179
Municipality of Anchorage
MEMORANDUM
DATE:
TO:
FROM:
SUBJECT:
June 27, 1985
Jerry Weaver, Community Planning Department
Robert W. Robinson, Manager, Environmental Health Division, DHHS ~
S-6875 Bavarian Heights Subdivision
This memorandum ia submitted to clarify and confirm the requirements of
the Environmentftl Health Division relative to tile final approval of the
Bavarian Heights Subdivision. As you and ~ discussed in our recent
meeting, our requirements are as follows:
1o Subsequent to the completion of the proposed curtain drain system,
there must be water monitoring tests t~en in the test holes on
lots 1 through 9 in Block 1 so as to determine the depth to the
seasonally high ground water table. These tests must be tM¢en
monthly throughout a minimum of one c(~nplete freeze/thaw cycle.
This would require a minimum direction of ~welve nx)nths of monthly
monitoring tests.
2. There are several lots in Block 2 which are also underlain with
shallow groundwater table. As in item 1 above, there must also be
monthly monitoring tests taken on these lots for a minimum duration
of one year.
3. Prior to development, all other lots must go through the normal on-
site disposal permitti~g process which will require that each lot
have sufficient area free of structures, driveways, parking areas,
etc., which will support the original and two replacement on-site
disposal sites.
JW/m/MWD1