Notes
Slide Show
Outline
1
Supplemental Investigation Status
Non-Public Properties Study Area
Hamden, Connecticut
  • CTDEP Public Information Meeting
  • November 9, 2004
2
 Known Extent of Filling as of June 2004.
3
Field Investigation Tasks
  • Contiguous Fill Bare Spot Characterization (Where is surficial fill exposed and what substances are found there?)
  • Contiguous Fill Extent Delineation (Exactly where is the edge of the contiguous fill?)
  • Isolated Fill Assessment Inspections (Are there any other isolated fill areas?)
  • Isolated Fill Assessment Drilling (How thick is the isolated fill and what substances are found in it?)
  • Groundwater Investigation / Supplemental Fill Characterization (Does the fill impact the groundwater and has fill variability been determined?)


4
 
5
Access agreement map
6
 
7
Bare Spot photo
8
Typical property map with bare spots
9
Surficial Fill (Bare Spot) Samples Summary
  • 166 Samples Field Screened by XRF
  • 84 Samples (properties) tested in Lab for:
  •  -  Total and Leachable Metals
  •  -  Polyaromatic Hydrocarbons (PAHs)
10
XRF INSTRUMENT
11
 
12
Geoprobe Rig
13
Typical Boring Plan
14
Typical Cross Section
15
 
16
Typical property map with transect
17
Native Soil Transect Samples
  • 123 Samples Field Screened by XRF
  •   39 Samples Tested in Lab for:
  •  -  Total and Leachable Metals
  •  -  Extractable Petroleum Hydrocarbons
  •  -  Polyaromatic Hydrocarbons (PAHs)
  •  -  Chlorinated Pesticides *
  •  -  Polychlorinated Biphenyls (PCBs) *
18
 
19
 
20
Sample Inspection Form
21
 
22
Typical Property map with Isolated
Fill Borings
23
Isolated Fill Samples
  • 84 Native Soil & 30 Isolated Fill Samples Field Screened by XRF
  • 26 Isolated Fill Samples Tested for:
  •  -  Total and Leachable Metals
  •  -   Extractable Petroleum Hydrocarbons
  •  -  Semivolatile Organic Compounds (SVOCs)
  •  -  Chlorinated Pesticides
  •  -  Polychlorinated Biphenyls (PCBs)
24
 
25
Well Installation
26
Flush-mounted Well
27
Well Pair
28
Fill Sample
29
29 Additional Fill & Underlying Soil Samples Tested for:
  • Total and Leachable Metals
  • Extractable Petroleum Hydrocarbons
  • Polyaromatic Hydrocarbons (PAHs)
  • Chlorinated Pesticides
  • Polychlorinated Biphenyls (PCBs)
30
Resident Data Reports Mailed October 2004
  • Inside/Edge Fill Inspections – no bare spots, no borings
  • Inside/Edge Fill Inspections – bare spot samples
  • Inside/Edge Fill Borings &/or bare spot samples
  • Outside Fill Inspections – no borings, no samples
  • Outside Fill Inspections & Isolated Fill Borings
  • Results shared with CTDEP and DPH
31
Schedule of Remaining Tasks
  • Begin groundwater sampling Nov. 16, 2004.
  • Install remaining 4 wells – awaiting access.
  • Interim Report on Isolated Fill Nov. 30.
  • Draft Investigation Report end of March 2005.
  • Supplemental groundwater monitoring report – October 2005
32
QUESTIONS??