HomeMy WebLinkAboutREDromerob3Cit Clerk Memorandu m
August 17, 201 0
TO :Mayor Romero & Members of the City Counci l
FROM :Elaina Cano, City Clerk g.0
VIA:Katie Lichtig, City Manage r
SUBJECT :Laguna Lake Dredgin g
Mayor Romero has requested that the attached Red File be distributed in anticipatio n
for a presentation he will give regarding Item B3 - Laguna Lake Dredging .
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Following are my thoughts regarding Laguna Lake dredging . I'm planning on presenting them
at the beginning of the Council discussion period .
A . 100 years from now, do we want a lake or a marsh ?
Answer :A lake is a much better choice .
B.To preserve the lake, it must be dredged . What should be the borders/boundaries of th e
maintained lake ?
Answer :The lake should be dredged within City ownership, with portions near house s
and formal park finished to an urban standard . Remote areas can be left more natural .
C.How deep should the dredging be ?
Answer :Combine information from various studies so as to minimize mixing of botto m
sediment due to wind action, minimize plant growth from the lake bottom and maximiz e
lake surface uses such as sailing . Depth should be determined from the flow line of th e
box culvert under Madonna Road, which represents the "beginning of summer" wate r
level .
D . What method should be used for dredging ?
Answer :The least expensive and most practical method would be with use of a suctio n
dredge .
E.Where and how would dredging spoils be disposed of ?
Answer :By far the cheapest and easiest location for disposal is placement on th e
Madonna grazing land and the back acreage of Laguna Lake Park . After the material ha s
dried, it can be tilled in as a soil amendment to the existing sparse native material . The
contour of the land would not be visibly changed and the soil would be more fertile .
F.What would the cost be ?
Answer :The City could lease or lease/purchase a floating diesel-powered dredge and
several thousand feet of flexible pipe . There would be dozer cost in creating receivin g
cells, and with setting up the dredge and laying out pipe . Dredging operations could b e
carried out by a small crew of part-time temporary City employees . Costs would be a
G :\Council Support & Corresp\City Council Correspondence\Romero\Communication Items\Laguna Lak e
Dredging .doc
DATE :
TO :
FROM :
David F . Romero
SUBJECT :
Study Session Item 4 – Laguna Lake Dredging
February 1, 2005
City Council
Laguna Lake Dredging
February 1, 200 5
Page 2
fraction of those listed in the report . Work could be conducted seasonally, weather o r
budget permitted .
G.Would there be flood protection benefits ?
Answer :The dredging program would not provide additional flood protection .
However, flood protection could be provided relatively inexpensively by placing a
flapper gate on the lake side of drains leading from Oceanaire into Laguna Lake, an d
connecting the catch basins on Oceanaire to a drainage pipe which would discharge to th e
Laguna Lake outlet on the easterly side of Madonna Road .
H.What are the obstacles to the dredging program ?
Answer :The biggest obstacle is "political will". The City has been unable to mov e
ahead on this issue for over 35 years as the lake has continued to deteriorate . I believe
regulatory and funding obligations could be resolved if there were firm Council directio n
to move ahead .