2 RYER ISLANDS IN

SOLANO COUNT

2016 DSC use of the wrong data from DRMS for the

Delta Levee Investment Strategy

Update of the ongoing use of incorrect data compiled by URS for the DRMS Phase 1 Report published by DWR, with incorrect

technical data still in use as of July 2016 Data compiled by NSS

http://deltacouncil.ca.gov/docs/delta-levees-

investment-strategy-dlis-risk-analysis-

methodology-report-july-2016-37mb

Letter to DSC

Independent

Science Board

advising of the use

of incorrect data

from DRMS Phase

1, with request to

correct data

related to Ryer

Island located

northeast of Rio

Vista

DSC response:

Acknowledging the incorrect

Data of DRMS …

DSC says DRMS

incorrect data was not

used for DLIS, then

says alternative data

was compiled (even

though the DRMS

Phase 1 report is

referenced for the data)

DSC acknowledges some

assets were missed, agrees to

add those assets, but does so in

an illogical way.

DSC says population total

comes from USACE…which

used DRMS. In any case DSC

says the population of Ryer

Island, based on census data, is

320 people protected by the

levees, assuming people on the

water side of levees would not

be at risk. (What about blocked

access due to road damage

from levee failure?

http://deltacouncil.ca.gov/docs/delta-levees-investment-strategy-dlis-risk-analysis-

methodology-report-july-2016-37mb accessed again 7-29-16 5:49 am PT

Despite assurances by DSC

representative, decisions are

proposed to be based on the

“best available science”. Yet

look at all the incorrect data

that is being used for just

ONE of the islands of the

Delta!

It appears information from

both Ryer Islands was

combined to create one

record, resulting in quite

substantial incorrect data in

use for the DSC decision

process, particularly for the

Ryer Island northeast of Rio

Vista.

Population: 0 or 320?

Acres:

BCDC Ryer Island restoration:

Suisun Marsh area 2007

Exhibit X 2016 Waterfix Protest hearing: Snug Harbor Resorts, LLC

evidence

Exhibit X 2016 Waterfix Protest hearing: Snug Harbor Resorts, LLC

evidence

http://deltacouncil.ca.gov/docs/delta-levees-investment-strategy-dlis-risk-

analysis-methodology-report-july-2016-37mb

Pages 1, map page 58, 64, 84, 128,190 , 359***, 475, 483, 495

DRMS references from DLIS: 386,

http://www.water.ca.gov/floodsafe/fessro/levees/drms/docs/Flood_Hazard_TM

.pdf

Page 1, 68 map, 92 flow stations,

http://www.water.ca.gov/floodsafe/fessro/levees/drms/docs/Risk_Report_Secti

on_13_Final.pdf page 31, map page 47 missing other ryer, 59 frequency, 60-

corrected map so show the properties,

Section of 2007 W6-1 from Ca Dept of Conservation showing gas and oil wells