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Christopher Stone, Project Lead for the Pacoima Sediment Removal Project stated at Eldridge Park’s October 22, 2013 community meeting that Maple Canyon being the selected SPS for a portion of the 7.2 MCY dredge of sediment from Big Tujunga Reservoir, no sediment would be trucked to Sun Valley Land Pits.
Mr. Stone’s comment is not consistent with a fair estimate of total truck trips impacting the East San Fernando Valley, considering three sources of Sediment Debris:
4.6 MCY for truck trips to Sun Valley of the overall 7.6 MCY from Pacoima Reservoir – if after subtracting 40% or 3 MCY marketable was processed in situ – not transported,
filling up Maple Canyon with 4.4 MCY of the overall 7.2 MCY from Big Tujunga Reservoir – leaving 2.8 MCY for truck trips to Sun Valley,
and 5.71 MCY from 113 Debris Dams from West and South areas for truck trips to Sun Valley,
totaling 14.71 MCY transported by 8 CY single load dump trucks equalling 1,838,750 truck trips over a 20 year project construction timeline with intensive truck trips occurring from 2016 to 2023. Even averaged out over twenty years, that’s a completely intolerable 183,875 truck trips every two years from Pacoima Reservoir, Big Tujunga Reservoir, and some 30 debris dams to Sun Valley’s Land Pits broadcasting carcinogenic air pollution dust, causing public safety risks and road damage.
Maple Canyon SPS was established in 1981 for previous cleanouts of the reservoir with the current remaining capacity up to 4.4 mcy. It currently holds approximately 3 mcy of sediment and the existing fill covers an area of approximately 28 acres. Excavated material will be transported approximately 1.8 miles to the existing SPS. Bulldozers and other heavy equipment would be operated continuously at the SPS in order to spread and compact the sediment. The addition of 4.4 mcy of sediment from this project will increase the SPS footprint by 29 acres. Areas within the increased fill footprint would be cleared and grubbed prior to the placing of sediment.
This magnitude of near 2 million truck trips, indeed, any number of truck trips in any event is unacceptable to communities most severely affected: Sylmar, Sun Valley, Pacoima, North Hollywood and to the East San Fernando Valley generally. The moral hazard to respiratory health, general health, road repair, safety, and social disruption is unacceptable. Mechanical conveyance is the most cost-economic method considering the social, health, ecologic costs of truck trips. Existing conveyances may be employed for cost savings.
There does not have to be alternatives pitting flora and fauna against health risks from hundreds of thousands of truck trips. Rewilding the foothills and canyons allows for natural deposition of alluvial sediment. Slope stabilization techniques allows for lowered and more controlled mud and debris flow before accumulating in Pacoima reservoir.
What has not yet been studied is the creation of cottage industries in situ sorting out sale-able component materials dredged from the reservoir: silt, decomposing organic matter, rock and gravel, and the deployment of a new system of smaller reservoirs to mitigate future volumes of sediment otherwise managed in more ‘business as usual’ DPW and LADWP failed methodologies that attempt to control nature rather than working and designing with nature.
Making up 70 years of neglect from allowing debris to negate the reservoir mission to protect downstream urbanized flooding in a twenty) year sentence of 7.6 cubic million yards transported from Pacoima Reservoir and 7.2 MCY from Big Tujunga Reservoir making 1,825,000 MCY single load haul truck trips each with a 8 cubic yard capacity terminating in historic ‘Pit District’ otherwise known as “Sun Valley” – is criminal and cannot be tolerated nor allowed to proceed as a plan.
Look, in lieu of this ill-fated Los Angeles County DPW plan, to mitigations from a proposed 170,000 truck trips over a 2 year period our community of activists extracted from LADWP over their Tujunga Spreading Ground dredge plan – being mechanical conveyance. If we can protect the community from 2 years of 170,000 truck trips, we certainly shall protect the same community from 20 years of 182,500 truck trips every 2 years – the equivalency of the LACDPW community-destroying ‘sediment management’ plan,
We can do this folks.