Progress Report - Sites 26 (EATS) and 28 (WATS) Restoration Advisory Board Former NAS Moffett Field January 14, 2010 Julie Crosby, Navy, and Dan Leigh, Shaw Group

1. Installation Restoration Sites 26 and 28
Abiotic / Biotic Treatability Study
Restoration Advisory Board Meeting
January 14, 2010

2. IR Site 26 Treatability Study
Purpose of Treatability Test
Determine if combined abiotic/biotic treatment is a viable remedial alternative
for mitigating the remaining chlorinated ethenes (CEs) present in the upper
portion of the A-aquifer at IR Site 26.
Treatability Study Method:
Conduct Pilot Test in area of highest CE concentration in upper A-Aquifer at
Site 26
Pilot Test Method:
Install wells in Pilot Test area
Determine baseline conditions in pilot test area
Inject EHC® into Aquifer
Measure Distribution of EHC®
Measure changes in pilot test area geochemistry
Measure changes in pilot test area CE concentrations
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4. Hypothesized Reaction Pathways
Biotic Abiotic
PCE PCE
TCE Dichloroacetylene
TCE
Cis 1,2-DCE Trans 1,2-DCE 1,1-DCE, trans 1,2-DCE, cis1,2-DCE
Chloroacetylene
VC
VC
Ethene Ethene Acetylene
Ethane Ethane C4
α-elimination Hydrogenolysis
C4 compounds
β-elimination Hydrogenation

5. Indicators of Degradation Pathway
Abiotic Pathway
Biotic Pathway
• Dichloroacetylene
• Chloroacetylene
• Primarily cis 1,2-DCE • Acetylene
• 1,1-DCE
• Stoichiometric Conversion
• Low TCE, DCE, VC / ethene ratio
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7. Tetrachloroethene (PCE)

8. Trichloroethene (TCE)

9. Dichloroethene (DCE)

11. Radius of EHC Distribution Evaluation

17. pH Oxidation-Reduction Potential
8.0 250 W-AB-1
W-AB-1
200
W-AB-2
W-AB-2
7.5
150
W-AB-3 W-AB-3
100
Concentration (mV)
Concentration (SU)
7.0 W-AB-4 W-AB-4
50
W-AB-5 W-AB-5
6.5 0
WU5-24 WU5-24
-50
6.0 EXW-1 EXW-1
-100
-150
5.5
-200
5.0 -250
-30 0 30 60 90 120 150 -30 0 30 60 90 120 150
Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)
Dissolved Oxygen Specific Conductance
0.9 8
W-AB-1 W-AB-1
0.8 W-AB-2 7 W-AB-2
0.7 W-AB-3
6 W-AB-3
Concentration (mg/L)
W-AB-4
0.6 W-AB-4
5
SC (mS/cm)
W-AB-5
0.5 W-AB-5
WU5-24 4
0.4 EXW-1 WU5-24
3
0.3 EXW-1
2
0.2
0.1 1
0.0 0
-30 0 30 60 90 120 150 -30 0 30 60 90 120 150
Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)

18. Arsenic Manganese
40 60
W-AB-1 W-AB-1
35 W-AB-2 W-AB-2
50
30 W-AB-3 W-AB-3
Concentration (mg/L)
Concentration (ug/L)
W-AB-4 40 W-AB-4
25
W-AB-5 W-AB-5
20 30
WU5-24 WU5-24
15 EXW-1 EXW-1
20
10
10
5
0 0
-30 0 30 60 90 120 150 -30 0 30 60 90 120 150
Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)
Sulfate Methane
250 20,000
W-AB-1 W-AB-1
18,000
W-AB-2 W-AB-2
200 16,000
W-AB-3 W-AB-3
Concentration (mg/L)
Concentration (ug/L) 14,000
W-AB-4 W-AB-4
150 12,000
W-AB-5 W-AB-5
10,000
WU5-24 WU5-24
100 8,000
EXW-1 EXW-1
6,000
50 4,000
2,000
0 0
-30 0 30 60 90 120 150 -30 0 30 60 90 120 150
Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)

19. Ethenes & Ethane- Molar Concentration
Average Inside Treatment Area
(WA-B-2, WU5-24, EXW-1)
0.7 PCE
0.6
TCE
Concentration (umol/L)
0.5
Total DCE
0.4
VC
0.3
Ethene
0.2
0.1 Ethane
0.0 Total
Ethenes &
-30 0 30 60 90 120 150 Ethane
Days (Day 0 = May 27, 2009)

20. Ethenes & Ethane- Molar Concentration
Average Outside of Treatment Area
(WA-B-1, WA-B-3, WA-B-4, WA-B-5)
0.7 PCE
0.6
TCE
Concentration (umol/L)
0.5
Total DCE
0.4
VC
0.3
Ethene
0.2
0.1 Ethane
0.0 Total
Ethenes &
-30 0 30 60 90 120 150 Ethane
Days (Day 0 = May 27, 2009)

21. Ethenes & Ethane - Molar Concentration
Average Downgradient of Treatment Area
(WA-B-1, WA-B-3, WA-B-4, WA-B-5)
0.8 PCE
0.7
TCE
Concentration (umol/L)
0.6
Total DCE
0.5
0.4 VC
0.3
Ethene
0.2
Ethane
0.1
0.0 Total
Ethenes &
-30 0 30 60 90 120 150 Ethane
Days (Day 0 = May 27, 2009)

22. W-AB-3 (Upgradient, 7 to 17 ft bgs)
Ethenes & Ethane - Molar Concentration
0.6 PCE
0.5 TCE
Concentration (umol/L)
0.4 Total DCE
0.3 VC
0.2 Ethene
0.1
Ethane
0.0
Total
-30 0 30 60 90 120 150 Ethenes &
Ethane
Days (Day 0 = May 27, 2009)

23. Relative Fraction of CEs, Ethene and Ethane
EXW-1
Treatment Area Wells
W-AB-2
WU5-24
Upgradient
Well
W-AB-3

24. Relative Fraction of CEs, Ethene and Ethane
W-AB-1
Downgradient Wells
W-AB-4
W-AB-5

25. Preliminary Conclusions Site 26 TS
• pH, ORP, SC, T, in the treatment area are within the range
considered appropriate for biotic and abiotic degradation of the CEs
• DO, nitrate, arsenic, manganese, iron, sulfate and methane reducing
conditions have been established in the treatment area.
• Degradation of CEs is occurring.
• Cis 1,2-DCE stall is not occurring.
• Complete conversion of CEs to non-toxic degradation products is
occurring.
• Dechlorinating microbial culture (DHC) is present in the treatment
area.
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26. 26 Treatability Study Schedule
January, 5, 2010 -2nd Quarter GW Sampling Event
March 29, 2010 – 3rd Quarter GW Sampling Event
June 28, 2010 – 4th Quarter GW Sampling Event
August 25, 2010 -Draft Treatability Study Results Technical Memorandum
October 27, 2010 -Final Treatability Study Results Technical Memorandum
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27. Expanded Pilot Test (Site 28) Methodology
Evaluate Three Technologies:
In Situ Anaerobic Biotic/Abiotic Degradation (ISABA)
EHC
In Situ Anaerobic Biostimulation with Bioaugmentation (ISABB) Process
Sodium Lactate & SDC-9
Emulsified Oil & SDC-9
Conduct Concurrent Pilot Tests in Three Areas:
Building 88 Area
Traffic Island Area
Well W9-18 Area
27

28. Expanded Pilot Test Site 28
Well W9-19 ISABB - Emulsfied
Oil & SDC-9
ISABA - EHC
ISABB - Lactate &
SDC-9
Task 1
3
2
ConductMonitoring Wells
Install MIPs Investigation
Inject Substrates

29. Site 28 Pilot Test Schedule
February 2010 - Work Plans Finalized
March 2010 - MIPs Investigation
May 2010 -Treatability Study Progress Report
June, 2010 – Monitoring Well Installation
July, 2010 - Substrate Injection
August 2010 to July 2011 - Performance Monitoring
October 2011 – Treatability Study Final Report
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