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How will this facility be kept operational once it is constructed considering the amount of dewatering that needs to occur?

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June 15, 2020
June 15, 2020

How will this facility be kept operational once it is constructed considering the amount of dewatering that needs to occur?

After construction, the water level in the facility would be higher than the surrounding groundwater. Also, the site would be surrounded by a slurry cutoff wall. […]
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June 15, 2020
June 15, 2020

Is there a possibility that the geotechnical reports DWR is currently conducting could change where the intakes are located?

It is possible that geotechnical conditions may result in minor adjustments to facility locations within currently identified intake sites; however, major changes are not anticipated at […]
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June 15, 2020
June 15, 2020

Can we have the GPS coordinates of the three favorable intake sites?

“The approximate GPS coordinates for the intakes described at the January 22, 2020, SEC meeting are provided below. As discussed in the January 22, 2020, SEC […]
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June 15, 2020
June 15, 2020

Would it be possible for the upcoming packet to get a map with the alignment for the tunnel that has the following? 1) Highways, railroads — any major infrastructure that is easy to label. It needs a few more markers for users. 2) A legend for miles. 3) Names of the islands through which it passes and refuges — public boat launches if time permits. My request is for readability.

All maps presented since January 2020 at the Stakeholder Engagement Committee meetings include major highways, railroads, legend in miles and names of the islands. A separate […]
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June 15, 2020
June 15, 2020

Is there a map reflecting existing water infrastructure and facilities such as intakes, diversion works and conveyance facilities?

This map was presented to the SEC during the February 12, 2020, meeting.
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June 15, 2020
June 15, 2020

What constitutes a recreational facility in terms of representing sensitive receptors?

The map presented at the December Stakeholder Engagement Committee meeting was prepared with information collected in past studies. The recreational areas shown on that map included […]
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June 15, 2020
June 15, 2020

Regarding flow at the intake: At the last meeting someone asked about negative or reverse flow in the river at the intake. There was an instant response of, “No, never negative,” but I wonder what that looks like at high or low tide. That is a big issue out here, and I personally would like to understand those flows at the intake during the complete tide cycle, i.e., top, bottom, half tide rising (flooding), half tide falling (ebbing). At full “take” what are the flows just above, just below and going out of the system? I assume that just below there is always a positive downstream cfs there even when it is peak flooding. Specific numbers like that would help. It would probably be good to measure during the driest drought time, low river flow. If we can get those flows, I can put stuff like that to bed when talking with people.

The project would not significantly impact the magnitude of reverse flows that would already occur in the river/Delta system. The project would divert water until the […]
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June 15, 2020
June 15, 2020

How does the project team know about the soil composition at the depths of the tunnel, which is over 100 feet below the surface?

“The geotechnical team has collated data from soil borings conducted not only for the prior project but from other construction projects across the Delta, including design […]
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June 15, 2020
June 15, 2020

Do any of the images or videos shared show tunneling through peat soils?

The demonstrations shown likely did not show peat soils. For the Delta Conveyance tunnel, based upon existing available geotechnical information, peat soils would not exist at […]
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June 15, 2020
June 15, 2020

How long would it take a salmon fry to move past ¼ mile of intakes and how many times would that fry have to swim back out of the flow? Is it possible that the outgoing tide at the lower end of the screen will be full of dead fish that didn’t have the stamina to continue swimming for the entire length of the intake, and how has that been factored into the design?

The fish passage time across the intakes would depend upon the flow velocity in the Sacramento River, depth of the water and fish swimming patterns across […]
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June 15, 2020
June 15, 2020

Heritage would be an important factor to add to the siting ranking criteria. In one of the previous meetings a comment was made about staying out of environmental considerations. How can at least some high-level aspects of environmental considerations be completely disregarded in the ranking of potential sites?

“The DCA siting analyses presented at the SEC are focused on design and construction considerations of physical facilities. Environmental considerations will be evaluated as part of […]
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June 15, 2020
June 15, 2020

Where are the alternatives that are being suggested in scoping meetings?

Alternatives are developed by DWR as part of completion of the EIR in accordance with CEQA, including consideration of scoping comments. Scoping comments will inform the development of alternatives. At this […]
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