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

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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