July 2010

• DTSC approved Addendum No. 1 to the IRM Mitigated Negative Declaration (MND) to account for minor changes with the onsite work areas and the increased number of Southern Tarplants, a plant species whose growth on the Site grew significantly after the MND was finalized
• DTSC filed a Notice of Determination with the California State Clearinghouse for Addendum No. 1 to the IRM MND
• IRM kick-off meeting and Mitigation Monitoring and Reporting Program coordination meeting was held with DTSC/PCR Services
• Began mobilization of equipment to Site for IRM
• Began perimeter air monitoring, SCAQMD Rule 1150/1166 monitoring, and air sampling in accordance with the IRM Air Monitoring Plan (AMP) and SCAQMD Rule 1150/1166 permit
• DTSC/PCR began weekly tarplant protection fence inspections
• SCAQMD inspector began approximate weekly Site inspections for SCAQMD Rule 1150/1166 compliance

August 2010

• Began importing lime kiln material (LKM) used to condition tarry lagoon material for transport
• Began transportation and disposal of tarry material
• Orange County Vector Department (OCVD) inspected Site and confirmed that no rats were present onsite

September 2010

• Submitted Pit F Odor and Emission Pilot Test to DTSC
• Conducted semi-annual groundwater monitoring and sampling event
• Continued removal and disposal of tarry materials from lagoons

October 2010

• Continued removal and disposal of tarry materials from lagoons

November 2010

• Continued removal and disposal of tarry materials from lagoons
• Submitted the Interim Groundwater Monitoring Report to DTSC for September 2010 sampling event
• DTSC approved a Notice of Exemption (NOE), to allow the addition of LKM to Lagoon 3 in order to increase the berm stability by reducing excess moisture caused by recent rains

December 2010

• Continued removal and disposal of tarry material from lagoons
• Mailed Fact Sheet No. 11 to quarter-mile radius around the Site
• Placed public notice with a Site update in the Huntington Beach Independent and the Huntington Beach Wave newspapers
• DTSC approved Addendum No. 2 to the IRM MND to include partial removal of tarry material from Lagoon 3
• DTSC filed a NOD for Addendum No. 2 with the California State Clearinghouse
• Received over ten inches of rain during the month
• City of Huntington Beach conducted storm water inspection

January 2011

• Continued removal and disposal of tarry material from lagoons
• Began removal of limited tarry materials from Lagoon 3
• Submitted Special Purpose Discharge Permit (SPDP) application to Orange County Sanitation District (OCSD) to allow the pre-treatment and discharge of accumulated stormwater/ surface water onsite from recent rain events
• Received SPDP from OCSD to pre-treat and discharge stormwater/ surface water from the Site to the OCSD sewer system

February 2011

• Completed IRM removal and disposal of tarry materials from Lagoons 1, 2, and 3
• Pre-treated and discharged stormwater/ surface water from Site to OCSD sewer system per SPDP
• Completed geotechnical borings in Lagoons 1, 2 and 3

March 2011

• Completed IRM activities
• Conducted final Interim Removal Measure walk-through with DTSC
• Demobilized IRM equipment from Site
• Completed pre-treatment and discharge of onsite stormwater/surface water to OCSD
• Conducted semi-annual groundwater monitoring and sampling event

April 2011

• Submitted the Interim Groundwater Monitoring Report to DTSC for March 2011 sampling event
• Submitted Close of Project Discharge Volume Report per the SPDP to OCSD and DTSC
• City of Huntington Beach conducted storm water inspection