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C A M B R I A Mr. Bob Gondek March 11, 2004 EMERGENCY RESPONSE ENVIRONMENTAL ACTIVITIES The objectives of the environmental portion of CPL'S emergency response activities were to protect human health and the environment.To these ends, CPL: • Established an exclusion zone and monitored vapor concentrations in ambient air; • Stopped the leak; • Contained and recovered released crude oil; • Assessed the general extent of crude oil impact to site soils; and • Excavated and stockpiled crude oil-saturated surface soils. Cambria's December 5, 2003 Draft Field Sampling and Interim Cleanup Workplan, (revised on December 8, 2003) proposed a general framework for the environmental response. Details of these response activities are presented below. Safety Evaluation and Monitoring CPL established an exclusion zone at the Site by encircling the oil-impacted area with caution tape and by controlling access to the Site through the property entrance at Mountain House Parkway. Initial response included Level C (respirator required) personal protection equipment (PPE) and oxygen, hydrogen sulfide, and lower explosive level (LEL) monitoring within the exclusion zone. Beginning on December 5, 2003, Certified Industrial Hygienist (C" David Beadle monitored benzene and total volatile organic compound (VOC) vapor concentrations in the exclusion zone. Based on Mr. Beadle's monitoring results, PPE within the exclusion zone was downgraded to Level D. CPL'S Level D PPE includes fire retardant clothing due to the potential risk of explosion during welding and other pipeline repair activities in the presence of crude oil. Release Containment Emergency crews, including CPL personnel and contractors Foss Environmental Services, Inc., and ARB, Inc., began containment work at the Site on December 4, 2003. The emergency crews stopped the surface migration of crude oil and recovered as much of the released oil as feasible. Berm, Trench, and Pit Construction: Berms were constructed at the outer edges of observed impacts to limit the lateral spread of oil. As soon as the point of pipeline puncture could be safely approached, the emergency crews excavated a trench and receiving pit to capture oil flowing from the pipeline. Figure 2 shows containment berm locations and the location of the receiving pit_Photographs 5 through 8 also depict these features. Vacuum Truck Recovery of Crude Oil: Crude oil flowing from the rupture entered the trench and flowed into the receiving pit where Foss Environmental Services and MP Environmental 3