Dr Ken Ashley BC Ministry of Environment
Fisheries Branch
Hypolimnetic Aeration Project Sheldrake
Lake Nova Scotia
Ken
Finally got the funds together
to proceed with our pilot Hypolimnetic Aeration Project and
would like to move ahead and contract your services as Technical
Advisor as previously discussed. From our previous correspondence
I recollect you suggested about a week of your time would be
required at standard consulting rates and we have set aside up
to $3000 for that purpose.
I hope you still have the
Brief on Sheldrake Lake written by Shalom Mandeville dated 17
May 1994 which inspired our project and forms the basis for our
efforts to todate. (We still hope to persuade Shalom to become
involved in the implementation of the project he initiated but
he is heavily committed to local and international projects at
this time. We will keep trying.)
Referring again to your
e-mail, I note that you were careful to qualify your opinion
that hypolimnetic aeration appears as a suitable restoration for
this lake procedure with the observation that because of
certain anomalies, special design precautions might be necessary
to maintain stratification during summer. We particularly need
your expert advice in this regard. We have recently sounded the
Lake and confirmed the maximum depth as 22 feet.
Typically,
our funding has various strings attached including the need to
press ahead and commence operations this summer to conform to
the budgeting schedules of our sponsors.
The equipment
we are purchasing is being purchased from Mark One Air
Equipment Limited and consists of
1 model Pro4 Oxygen
Generator. Oxygen output flow of 32 SCFH. Output pressure of
45-50 PSIG. Output purity of 94%, +/-2%. Dimensions of 26" x
26" x 82", weight of 300 Lbs.
1 hydrovane
compressor model RU-S, rotary vane air compressor. This is
a modulating type compressor that is designed to operate 24
hours per day, all year. Power is 575/3/60 or 220/3/60.
I Wilkerson model. MI6-04-FOO, 11/2" NPT coalescing
filter, c/w auto drain.
1 reel of 1/2" hose, PVC
braided. P/N PVC-128-500. Length is 500 feet.
1
assortment of fittings, 2 ball valves and a pressure switch to
indicate if no oxygen is flowing, Includes a discharge
regulator.
1 Diffuser manifold with 1/2" NPT inlet and 4
x 1/2" diffuser tubes, and back flow check
As the
situation now stands we have ordered the compressor and separator
and are working at construction of a small shed on a concrete
pad near the lake and arrangements for power supplies. However
we need you advice particularly with respect to the diffusers,
regulation of release, and any other advice you may have to
offer.
We have initiated an intensive water sampling program
and plan for a complementary biological sampling program but
need direction on what samples to take, sampling protocols and
where to get them analyzed. We have asked a Dalhousie faculty
member for advice but would like any recommendations you may
have to offer. l
Since the Nova Scotia Ministry of the
Environment is a major sponsor of the pilot project it is hoped
that your technique will be applied in other shallow lakes
thoughout the province depending on results of the pilot
project. In this regard any public relations material you may
have would also be appreciated so we can get the attributions
right.
Yours aye Frank Hope
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