Amanda Stone Director, Waste Programs Division Arizona Department - - PowerPoint PPT Presentation

amanda stone
SMART_READER_LITE
LIVE PREVIEW

Amanda Stone Director, Waste Programs Division Arizona Department - - PowerPoint PPT Presentation

Amanda Stone Director, Waste Programs Division Arizona Department of Environmental Quality Emerging Issues in Arizona Long Term Stewardship UXOs Vapor Intrusion Perchlorate 1,4-dioxane Long Term Stewardship: Arizonas


slide-1
SLIDE 1

Amanda Stone

Director, Waste Programs Division Arizona Department of Environmental Quality

slide-2
SLIDE 2

Emerging Issues in Arizona

  • Long Term Stewardship
  • UXOs
  • Vapor Intrusion
  • Perchlorate
  • 1,4-dioxane
slide-3
SLIDE 3

Long Term Stewardship: Arizona’s Solution

  • Declaration of Environmental Use

Restriction, enacted in 2000

  • Engineering and institutional controls
  • Groundwater, soil, landfills
  • Fee and financial assurance
  • Inspections to verify implementation
slide-4
SLIDE 4

Long Term Stewardship, cont.

  • 66 DEURs filed to date

– 61 institutional controls – 5 engineering controls

  • 1 FTE dedicated to compliance – 128a

funding

  • 97 inspections conducted to date - 1

facility out of compliance

slide-5
SLIDE 5

UXOs - Issues

  • ~ 25 practice bomb target sites DoD FUDs
  • Urban expansion - encroaching on

formerly rural bomb target sites

  • DoD FUDs prioritization not keeping pace

with changing land use patterns

  • Developers requesting NFA through VRP

for residential development – no ADEQ standard for “how clean is clean”

slide-6
SLIDE 6

UXOs - Issues, cont.

  • Williams Field Bomb Target Range # 6

near Florence.

  • Barriers to sale because of potential

liability.

slide-7
SLIDE 7

UXOs – Response

  • Retained consultant to evaluate VRP site

work using DoD guidance

  • Reprioritization requested for several sites
  • Limit NFA to approval of site

assessment/cleanup protocol

slide-8
SLIDE 8

Vapor Intrusion - Issues

  • Emerging issue nation-wide
  • No enforceable Arizona indoor air

standards

  • Risk communication
  • Political sensitivity – indoor air samples
  • Integrity of indoor sampling data
slide-9
SLIDE 9

Vapor Intrusion - Response

  • ADEQ soil rule allows vapor sampling to

demonstrate compliance

  • Working with ADHS to certify lab methods

(EPA 8260)

  • Vapor sampling guidance finalized this

year

  • ADEQ currently evaluating available

guidance/models

slide-10
SLIDE 10

Perchlorate - Impacts

  • 480 ppb from Lake Mead contaminated

Colorado River

  • CAP water reinjection into recharge basins

and used for irrigation

  • Concentrations between 4-11ppb in

recharged groundwater throughout state

  • Industrial sites have impacted

groundwater

slide-11
SLIDE 11

Perchlorate - Response

Lake Mead source (Las Vegas Wash) contained – significant reduction in Colorado River concentrations – under 5ppb Arizona groundwater health-based guidance level: 14 ppb Arizona soil standard established: 55 ppm Soil rule requires residual soil concentrations be protective of groundwater/ecological receptors

slide-12
SLIDE 12

Perchlorate - Response

  • UPCO – RCRA corrective action under

consent order and permit

  • Talley – RCRA (burn ground closure) and

APP closure currently being modified.

  • YMCAS – RCRA permit requires periodic

sampling in detonation pit

slide-13
SLIDE 13

1,4-Dioxane – Tucson International Airport Area Superfund Site

TCE, PCE, TCA in groundwater – from Air Force Plant 44 operations 1,4-dioxane used as stabilizing additive for TCA until 1971 Detection limit was not sensitive enough to detect 1,4-dioxane during original groundwater sampling ROD finalized to address only VOCs

slide-14
SLIDE 14

1,4-dioxane, cont.

  • Air strippers/pump and treat system installed in

1987 to address TCE, PCE, TCA. Did not remove 1,4-dioxane

  • Treated water reinjected at plume perimeter,

unknowingly spreading 1,4-dioxane

  • 2002 – large plume of 1,4-dioxane discovered

after development of methods with lower detection limit

  • Reinjection system modified to minimize 1,4-

dioxane spread

slide-15
SLIDE 15

1,4-dioxane, cont.

  • No MCL or AWQS
  • EPA issued administrative order under

Safe Drinking Water Act. Order required expedited system installation

  • EPA cleanup goal for new treatment

system at this site – 3ppb

  • ROD will be modified
slide-16
SLIDE 16

1,4-dioxane, cont.

  • Advanced oxidation treatment system

currently being installed (hydrogen peroxide and ozone).

  • New system operational early 2009