3:15 p.m. Update from the Office of Conservation

Bayou Corne/Grand Bayou Response Activity

Wednesay, April 23 work-

Sinkhole Activity Code 1 – indicating work is allowed on sinkhole and within containment berms. Seismic monitoring indicates low levels of subsurface activity near sinkhole/Oxy 3.

Air Monitoring/Sub-slab Sampling and Ventilation

– Conducting ventilation system inspections

ORW/CPT Wells

– Continuing pumping on ORWs 4 (northwest of containment berm), 14 (Oxy 9 well pad), 15 (north of La 70, east of Gumbo Street), 48 (north of containment berm) and 54 (west of Bayou Corne, south of La 70)

– Redeveloping ORW 14 with nitrogen

– Removing pump from ORW 26 (north of containment berm)

– Installing pressure transducer in ORW 9 (west of containment berm)

Containment/ Roads/ Sinkhole/Survey

– Conducting sinkhole water profile

– Compacting limestone on south containment berm re-route

– Placing riprap on slope areas of south containment berm re-route

– Surveying south containment berm re-route for final elevation

– Installing pressure gauges on DPVE for Bubble Site 53 (south of Oxy 10 well pad)

– Venting DPVE for Bubble Site 26 (near Oxy 2 well pad)