Overview of the First Quarter 2015

Surveillance andMaintenance Report for the LM Rocky Flats Site

January–March 2015

Quarterly Monitoring and Reporting Quarterly reports are required under the Rocky Flats Legacy Management

Agreement (RFLMA) to document that the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) remedy continues to be protective• Primary goal is surface water protection

Response action under the final remedy for Rocky Flats • Maintain two landfill covers• Maintain four groundwater treatment systems• Surface water and groundwater monitoring• Physical controls

Signage Restricted access

• Institutional controls No building construction or occupation Restrictions on excavation and soil disturbance No surface water consumption or agricultural use No groundwater wells except for monitoring Landfill covers and engineered remedy

components protection

2

Surface Water Monitoring

First Quarter 2015

Selected RFLMA Surface Water Monitoring Locations

4

Indiana StreetWalnut Creek

Woman Creek

Woman Creek

N. Walnut Creek

S. Walnut Creek

Central OU Boundary

PLFTS

Pond C-2

Pond A-4

Pond B-5

GS10

SW093

SW027

GS59 WOMPOC

WALPOC

PresentLandfill

OriginalLandfill

Performance Monitoring at Original Landfill (OLF) and Present Landfill (PLF) OLF (Woman Creek – location GS59)

• All sampling results met water quality standards during the quarter

PLF (System Effluent – location PLFSYSEFF)• Routine quarterly sampling result for vinyl

chloride was 0.23 g/L Above RFLMA standard of 0.2 g/L

Prompted increased sampling frequency (monthly) per RFLMA evaluation protocols

• Three consecutive monthly sampling results above standard (0.24 – 0.26 g/L) Prompted former PLF Pond outfall to No

Name Gulch (location NNG01) sampling

• Vinyl chloride not detected at NNG01; sampling frequency reverted to quarterly per RFLMA protocols

55

Point of Evaluation (POE) Monitoring All RFLMA POE analyte

concentrations were not reportable throughout the first quarter of calendar year (CY) 2015

66

Point of Compliance (POC) Monitoring Reportable 12-month rolling average uranium

concentrations were initially observed at WALPOC on October 31, 2014

Uranium was no longer reportable at WALPOC as of January 31, 2015

All other RFLMA POC analyte concentrations remained below reporting levels throughout the firstquarter of CY 2015

777

Questions?

88

First Quarter 2015

10

NOTE: Groundwater treatment system locations omitted for clarity

RFLMA Monitoring Light sampling quarter

• 10 Resource Conservation and Recovery Act wells (quarterly) Statistical evaluation of results will be presented in

annual report

11

Non-RFLMA Monitoring Treatment systems

• East Trenches Plume Treatment System (ETPTS): air stripper Sampled to support reconfiguration project

• Solar Ponds Plume Treatment System (SPPTS): microcell and lagoon testing

12

Treatment System Activities Mound Site Plume Treatment System (MSPTS)

• Air stripper maintenance ETPTS

• Completed reconfiguration project SPPTS

• Continued microcell tests• Continued pilot-scale lagoon tests (including sampling)

Replaced blankets with insulated covers• Maintained pumps, solar/battery power facility

13

ETPTS Reconfiguration Project Completed electrical work Completed air-stripper enclosure Activated air stripper January 16, 2015

• Collected samples to confirm treatment effectiveness Initial samples: Trichloroethene concentrations slightly above

RFLMA target• Blower motor output increased• Subsequent samples met all applicable RFLMA standards

Manufacturer cites this unit as the only fully off-grid, solar/battery air stripper known

14

15

Questions?

1616

1

10

100

1000

100001/

1/20

09

5/5/

2009

9/7/

2009

1/10

/201

0

5/15

/201

0

9/17

/201

0

1/19

/201

1

5/24

/201

1

9/26

/201

1

1/29

/201

2

6/2/

2012

10/4

/201

2

2/6/

2013

6/11

/201

3

10/1

4/20

13

2/16

/201

4

6/20

/201

4

10/2

3/20

14

2/25

/201

5

6/30

/201

5

Con

cent

ratio

n (u

g/L)

Sample Date

Influent VOCs

Effluent VOCs

Media Repl 09

Orig. AS on

New AS on

AS Inf VOCs

AS Eff VOCs

1

10

100

1000

10000

1/1/

2014

1/31

/201

4

3/2/

2014

4/1/

2014

5/1/

2014

6/1/

2014

7/1/

2014

7/31

/201

4

8/30

/201

4

9/29

/201

4

10/3

0/20

14

11/2

9/20

14

12/2

9/20

14

1/28

/201

5

2/27

/201

5

3/30

/201

5

4/29

/201

5

5/29

/201

5

6/28

/201

5

Con

cent

ratio

n (u

g/L)

Sample Date

Total VOCs Detected in ETPTS Influent vs. Effluent

Influent VOCs

Effluent VOCs

Media Repl 09

Orig. AS on

New AS on

AS Inf VOCs

AS Eff VOCs

First Quarter 2015

Site Operations

Quarterly Sign Inspections

18

RFLMA physical control All signs are in good condition

Site Operations – OLF Performed three monthly inspections – One special

inspection due to more than 10 inches of snowmelt Monitored eight settlement monuments and seven

inclinometers

191919

Site Operations – OLF (continued) Completed the project to reconfigure the East Perimeter Channel

in mid-January Observed cracking and slumping in several locations on the east

side of the OLF in March Filled cracks as feasible, based on soil conditions CDPHE and the U.S. Environmental Protection Agency inspected

the landfill on March 17, 2015 The geotechnical engineer inspected the landfill on March 19

20

Site Operations – OLF (continued)

21

22

Site Operations – PLF Performed one quarterly inspection – One special

inspection due to snowmelt of more than 10 inches

23

Questions?

2424