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CONSTRUCTION UPDATE
Napa Plant Site
Central Unit
Napa Plant Site – Central UnitProject Location
Major Design Elements
Construction Photos
Channel Excavation
Construction Photos
South Perimeter
Levee Lowering
Public Access Features
Construction Photos
Barge Channel Breach
Construction Photos
Construction Photos
MONITORING AND ADAPTIVE MANAGEMENT
Napa Plant Site
Central Unit
Water Quality Monitoring
• Water quality parameters: salinity, turbidity, temperature, pH, and dissolved oxygen (DO).
• Time: Data collected during an ebbing tide Frequency:– Within 3 days prior to breaching– Once during the first 24 hrs after breaching and again
within 5 days after breaching– Weekly for the first month after breaching– Monthly until water quality objectives have been met
for 3 consecutive months
Per California Regional Water Quality Control Board
Sampling Locations• 6 locations for Central Unit
Breach. Shown on map as yellow dots
• NR-3 - Napa River, location 3• CUB-DS-150 - Central Unit Breach
Downstream 150 ft• CUB - Central Unit Breach• CUB-US-150 - Central Unit Breach
Upstream 150 ft• NR-2 - Napa River, location 2• NR-1 - Napa River, location 1
• Additionally sampled at the North Unit Breach (not included on following charts for clarity)
Salinity
20.00
21.00
22.00
23.00
24.00
25.00
9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6
Sa
linit
y (
pp
t)
NR-3 CUB-DS-150 CUB CUB-US-150 NR-2 NR-1
Salinity• Performance Standard – Outflow from site will
increase by no more than 5 ppt during any tide cycle.• Results – Within performance standards
BREACH9/29/09
Turbidity
0
10
20
30
40
50
60
70
80
9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6
Tu
rbid
ity
(N
TU
)
NR-3 CUB-DS-150 CUB CUB-US-150 NR-2 NR-1
Turbidity• Performance Standard – Outflow from site will not increase turbidity by more than 5 NTU
during any tide cycle or by more than 10% if background is > 50 NTU.• Results – Turbidity spikes in the first few days but returned to performance standards after 1
week.
BREACH9/29/09
Temperature
16.00
17.00
18.00
19.00
20.00
21.00
9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6
Te
mp
era
ture
oC
NR-3 CUB-DS-150 CUB CUB-US-150 NR-2 NR-1
Temperature• Performance Standard – Outflow from site will not increase temperature by more
than 2.8o C in the wet season and 5.6o C in the dry season during any tide cycle.• Result – Within performance standards
BREACH9/29/09
pH
7.00
7.10
7.20
7.30
7.40
7.50
7.60
7.70
7.80
7.90
8.00
9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6
pH
NR-3 CUB-DS-150 CUB CUB-US-150 NR-2 NR-1
pH• Performance Standard – Outflow from site will not cause changes
greater than 0.5 units of pH during any tide cycle.• Results – Within performance standards
BREACH9/29/09
Dissolved Oxygen
5.00
6.00
7.00
9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6
Dis
so
lve
d O
xy
ge
n (
mg
/L)
NR-3 CUB-DS-150 CUB CUB-US-150 NR-2 NR-1
Dissolved Oxygen• Performance Standard – Outflow from site will not decrease DO to a
concentration lower than 5.0 mg/L during any tide cycle.• Results – Within performance standards
BREACH9/29/09
