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Item No. 8.a.
Request to Allow Trees within
the Iron Horse Corridor
Jarred Miyamoto -Mills
January 26, 2012
Central Contra Costa Sanitary District
Request to Allow Trees
in IHC Easements
• In 1985, CCCSD paid $5.4 million for easements in the
former Southern Pacific Railroad Right -of -Way.
• IHC easements extend about 15 miles from the San
Ramon Pumping Station to Monument Blvd.
• The Collection System Master Plan projects that an
A -Line Relief Interceptor in the IHC will be required to
convey wet weather flows between Ygnacio Valley Road
and Monument Blvd at some time in the future.
• A parallel interceptor is also needed in this alignment to
allow diversion of flow from the existing A -Line when
repair or renovation is needed.
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Request to Allow Trees
in IHC Easements
• The Walden District Improvement Association (WDIA)
has requested that CCCSD allow about 30 volunteer
trees to remain within the easement in Walnut Creek and
Pleasant Hill.
• The District Code prohibits trees in easements, so staff
denied the WDIA request.
• WDIA has asked the Board to consider granting an
exception to the prohibition.
Request to Allow Trees
in IHC Easements
• CCCSD and Contra Costa County have cooperated to
maintain a consistent and clear policy of not permitting
trees in CCCSD's IHC easements.
• CCCSD has not required removal of mature trees along
the edge of the easements.
• If additional trees are allowed to grow in the easements,
removal for future maintenance access or A -Line Relief
Interceptor construction could be problematic and costly.
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IHC Map
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IHC Photos
Typical 1lfew of Iron Horse Corridor
Manhole Covers Along Trail
Landscaped Section of Iron Morse Corridor
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Request to Allow Trees
in IHC Easements
• Alternatives:
- Deny WDIA's request.
Direct staff to prepare terms, conditions and
documents for the granting of an exception to the
District Code prohibition of trees in easements.
• Recommendation:
- Deny WDIA's request.
MISS
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