W912DR18R0055_-_Attachment__I_-_OU7_Optimization_Memo.pdf

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DMW-33B

PIT 1

PIT 2

PIT 3FORMER ABOVE GROUND

FUEL STORAGE TANK

SECONDARY CONTAINMENT BERM

CMT18

CMT20

CMT21

CMT22

CMT24

CMT24

CMT25

DMW22E

MWFTA13

MWFTA17

MWFTA21

MWFTA28B

MWFTA29B

MWFTA2A

MWFTA30B

MWFTA31B

MW102

CMT18

CMT20

CMT22

CMT24

DMW29B

MWFTA14

MWFTA15

MWFTA16

MWFTA18

MWFTA19

MWFTA20

MWFTA4

MWFTA8

MW100

MW101

MW103

MW99

PWFTA2

AEHADG10

AEHADG11

AEHADG8

AEHADG9

CMT18

CMT20

CMT21

CMT22

CMT24

CMT25

DMW13A

DMW19A

DMW20A

DMW21A

DMW22A

DMW25A

DMW26A

DMW27A

DMW29A

DMW33A

DMW35A

EBF05S

MWFOS2

MWFOS3

MWFOS4

MWFTA1

MWFTA10

MWFTA11

MWFTA12

MWFTA22

MWFTA23

MWFTA24

MWFTA25

MWFTA26

MWFTA27

MWFTA27A

MWFTA3

MWFTA5

MWFTA6

MWFTA7

MWFTA9

MWPAH1

MW108

MW109

MW116

MW117

MW118

MW119

MW120

MW121

MW122

MW123 MW124

MW125

MW127 MW128

MW138

MW139 MW140

MW141

MW142

MW143

MW144

MW145

MW146

MW147

MW148

MW149

MW150

MW36

MW40

MW41

MW42

MW43

MW44

MW46

MW47

MW48

MW50

MW51

MW52

MW53

MW54

MW55

MW56

MW57

MW59

MW60

MW61

MW62

MW64

MW65

MW68 MW69

MW71 MW72

MW74 MW75 MW76

MW77

MW78

MW79 MW80

MW81

MW82

MW83MW84

MW85

MW86

MW87

MW88

MW89

MW90

MW91

MW92

MW93

MW94

MW95

MW96

MW97

MW98

P1BWA58

P1BWA66

P1BWA67

P1BWB63

P1BWB70

P1BWB73

P2BWA45

P2BWB49

PZ1

PZ2

PZ3

PZ4

PZ5

PZ6

PZ7

PZ8

PZ9

PWFTA1

CMT23

INJ128

INJ129

INJ130

INJ131

INJ132 INJ133

INJ134

INJ135

INJ136

INJ137

INJ104

INJ105

INJ106

INJ107

INJ151

INJ152

INJ153

INJ154

INJ155

INJ156

INJ157

INJ158

INJ159

INJ160

INJ161

INJ162

INJ163

INJ164

INJ165

INJ166

INJ167

INJ168

INJ169

INJ170

INJ171

INJ-202

INJ-200

INJ-201 INJ-203

INJ-204

INJ-205

INJ-206

INJ-207

INJ-208

INJ-209

INJ-211

INJ-213

INJ-212

INJ-210

Bldg. 112Bldg. 74

Warehouse 4

Bldg. 24

OS-2

OS-1

Bldg. 94Bldg. 96

Bldg. 193

Area 1

Area 5

Area4

Area 3

Area 2

G Rd

Q Rd

P Rd

O Rd

Defense General

M Rd

KIN

GSL

AN

D CREE

K

11788500

11788500

11789000

11789000

11789500

11789500

Data Sources: AECOM, GIS Data;

ESRI, ArcGIS Online, Aerial Imagery Coordinate System: VA State Plane, South Datum: NAD 83 Units: Feet

0 100 200

Feet

Legend U.S. Government Property

OU-7

Biowall Location Fire Training Area Pit Location

! SVE/DPE Pilot Test Well (1995) DDC Pilot Test Area (1999)

!. DDC Well (1999) EVO Injection Area (January 2016) In-situ Bioremediation Area

Monitoring Wells @? Lower WBU Injection Well @? Upper WBU Injection Well !A Bedrock Monitoring Well !A Saprolite Monitoring Well @A Lower WBU Monitoring Well

Monitoring Well, WBU Unknown &, Lower WBU Piezometer &, Piezometer, WBU Unknown

TCE Plumes (LWBU) (Spring 2016) 5 µg/L 50 µg/L 500 µg/L 5000 µg/L

Bedrock Well ID Saprolite Well ID Lower WBU Well/PZ ID Unknown WBU Well/PZ ID Upper WBU Well ID Groundwater Elevation

MW102

MW100

MW124

CMT23

Defense Supply Center Richmond Richmond, VA

³ Figure 1 OU7 Remedial Technologies and Pilot Tests

95.01

OU-7 SVE/DPE Pilot Test (1995) The test was conducted in August and September 1995. Based on the results, the DPE technology was recommended for consideration as part of an overall remediation plan.

Density Driven Convection (DDC) Pilot Test (1999) A pilot system consisting of one DDC well, nine nested piezometers and an above ground pressurized air supply system were used to test the effectiveness of DDC in reducing concentrations of COCs in groundwater and to evaluate the feasibility of using DDC as a full scale remedial technology. The system was operated from December 17, 1998 to January 18, 1999.

In this technology, air injected at the bottom of the DDC well, rises in a series of slugs creating the flow of water through the DDC well, and ultimately leading to a circulation of water within the aquifer surrounding the well. Dissolved volatile compounds would be stripped off the groundwater as the water flows through the well and the oxygenated groundwater circulated through the aquifer would stimulate bioremediation within the contaminated aquifer.

Results of the test suggested that DDC would be a feasible remedial option for the site. It showed that DDC can reduce dissolved VOC concentrations at least 19 feet away in 26 days of operation.

OU-4 Time Critical Removal Action (2004) 987 cubic yards of soil were excavated in order to remove contaminant mass from the vadose zone at OU4.

OU-7 Enhanced In-situ Biodegradation Treatability Tests (2007 & 2009) They were implemented in the Pits 1 and 2 areas of OU7 Lower WBU. These tests consisted of placement of two PRBs or treatment walls (biowalls) containing organic mulch and sand downgradient of FTA Pit 1 and FTA Pit 2 source areas.

A separate in-situ bioremediation treatability test was conducted in the FTA Pit 3 area in April 2009. Approximately 2,125 gallons of ~ 6 percent (volume/volume) EVO was injected in an area of elevated chlorinated solvent concentration in the OU7 Lower WBU.

OU-7 MNA, LTM

(2012 - present) ROD for OU7 was signed in 2012. The final remedy for OU7 consisted of in-situ bioremediation consisting of EVO injections in source areas and downgradient high concentration areas, MNA and Long Term Monitoring and Institutional Controls.

OU7 In-Situ Bioremediation and ICs (2013 - present) As part of the final remedy, in-situ bioremediation that included injections of EVO was initiated in 2013 to treat CVOCs in the lower WBU at the source area and downgradient plumes. Institutional controls were also established to prevent exposure to OU-7 groundwater.

INJ128

1 inch = 75 feet

Proposed Wells ") Proposed Injection Well - 2017 Network Expansion (by ACE) ") Proposed Injection Well - Remedy Optimization