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Presentation to the Moffett Restoration Advisory Board November 18, 2010: Former Orion Park Housing Area (OPHA) Supplemental Site Investigation for Groundwater
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FORMER ORION PARK HOUSING AREA (OPHA)AREA (OPHA)SUPPLEMENTAL SITE INVESTIGATION FOR GROUNDWATER
Restoration Advisory Board Project UpdateNovember 18, 2010
Former OPHA Site
Site Use
A1 –TrichloretheneTrichlorethene(TCE) Plume in Upper (A1) ZoneZone
A2 –TCE A2 TCE Plume in Lower A2 Zone
Supplemental Site Investigation (SSI)pp g ( )
Problem - TCE in upper (A1) zone & lower (A2) zones of pp ( ) ( )unconfined aquifer
Purpose – Assess whether an on-site source of TCE is present at f O i P k Aformer Orion Park Area Focus on 9 locations of concern (LOCs) for TCE
5 LOCs in AI zone
4 LOCs in A2 zone
Drill cone penetrometer/membane interface probes (MIP) at 28 to 50 locations
Then, push probes for grab groundwater samples at 0 to 18 locations (based on MIP results), analyze for TCE
Install 0 to 9 groundwater wells at sources, if any
Investigation Areas in Upper (A1) and Lower (A2) Zones(A2) Zones
Investigation A i UArea in Upper A1 Zone
Investigation gin Lower A2 Zone
5 Locations of Concern (LOCs) –Upper A1 Zonepp
4 Locations of Concern (LOCs) –Lower A2 Zone
Membrane Interface Probe (MIP)
MIP Responsep 20 readings/foot or 0.05-
foot increments P fil VOC t ti i Profiles VOC concentrations in
unsaturated & saturated zones
Instantaneous data outputs
Combined with cone penetrometer test (CPT) penetrometer test (CPT) sensors - records lithology
Membane Interface Probe (MIP) –I tImprovements
Hardware Software Improvements Hardware Improvements Improved sensor loop
Software Improvements Better correlation of readings
with CPT and MIP profilingp pinside probe
Better gas Direct feed into Geographic
Information System (mapping ) d lchomatographs
Follow standard-ti d
program) and Environmental Visualization Software (EVS) (Geology and Groundwater operating procedures (Geology and Groundwater modeling tool) for interpretation
Example - MIP Profile Indicates Source? - YESDiscrete Sample ResultsMIP LogsCPT Logs
TCE 1,1-DCE Depth
Discrete Sample ResultsMIP Logs
Capillary fringe
MIP log legendBaseline (variable)5.0 e +51.0 e +65.0 e +6
Maximum response at 10.45 feet
5.0 e 6
Example - MIP Profile Indicates Source? – No (Plume)
TCE 1,1-DCE Depth
Discrete Sample Results
Capillary fringe
MIP log legendBaseline (variable)5.0 e +51.0 e +65.0 e +6Initial response at water table
Maximum response at 26.45 feetp
SSI Schedule
Phase Description Dates
Investigation, Phase 1
Water Level Measurement & Monitoring Well Sampling
November 2010
Investigation SSI Investigation (CPT/MIP), January & February 2011Investigation, Phases 2 ,3 & 4
SSI Investigation (CPT/MIP),Direct-push Investigation, Monitoring Well Installation/Development & Sampling
January & February 2011
Investigation, Phase 5
Investigation –Derived Waste Management,Laboratory Analysis
February - June, 2011
Reporting Draft Report for review May 2011
dmy4
Slide 14
dmy4 put in tabledayna.yocum, 11/15/2010
OPHA Project Team Contactsj
US Army – Guy Romine – (443) 567-1772 US Army Guy Romine (443) 567 1772 US Army Corps of Engineers – Cynthia Burris (916)
557-6745557 6745 US EPA – Alana Lee – (415) 972-3141 Regional Water Quality Control Board Elizabeth Regional Water Quality Control Board – Elizabeth
Wells (510) 622-2440
Questions
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