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Ms. Kasey Foley • October 31, 2014 Page 2 of 3 A core drill will be advanced through the concrete pad in the approximate locations shown in Photos #1 through #5. After the cores have been removed, a soil sample will be collected from about 6 inches below the bottom surface of the concrete. All soil samples will be collected by or under the direction of a professional geologist registered in California. Soil samples will be obtained using a split-spoon or slide hammer sampler with brass or stainless steel liners. A chip sample will also be obtained from the concrete core that was within 2 inches of the soil interface. The field geologist will screen extracted soil and concrete cores for physical evidence of contamination(e.g.,odors, chemical sheen,or discoloration). The soil samples will be sealed with Teflon tape, capped, labeled, and placed in a pre-chilled ice chest. Concrete chip samples will be placed in clean sample containers. Chain-of-custody procedures will be used to record the sample possession from time of collection to receipt at the laboratory. The chain-of-custody procedure includes sample seals, sample labels, a field logbook, a Chain of Custody Record, and a sample analysis request sheet. Each sample collected will be analyzed by a state-certified laboratory for Total Petroleum Hydrocarbons reported as motor oil (TPH-mo) by Environmental Protection Agency(EPA)Method 8015M. Prior to core drilling and sample collection, drilling permits will be obtained, if required. After the samples are collected, each boring will be backfilled with grout. Bath Basement Samples Two sample locations have been selected in areas where significant oil staining in the concrete floor has been observed. One sample location is under the former Lehr gear system, and one is located where an oil pump system was situated. The approximate sample locations are shown in Photos#6 and#7. Holes through the concrete floor will be core-drilled to collect samples in the approximate locations shown. After the cores have been removed, a soil sample will be collected from about 6 inches below the bottom surface of the concrete. All soil samples will be collected by or under the direction of a professional geologist registered in California. Soil samples will be obtained using a split-spoon or slide hammer sampler with brass or stainless steel liners. A chip sample will also be obtained from the concrete core that was within 2 inches of the soil interface. The field geologist will screen extracted soil cores for physical evidence of contamination (e.g., odors,chemical sheen, or discoloration). The soil samples will be sealed with Teflon tape,capped, labeled,and placed in a pre-chilled ice chest. Concrete chip samples will be placed in clean sample containers. Chain-of-custody procedures will be used to record the sample possession from time of collection to receipt at the laboratory. The chain-of-custody procedure includes sample seals, sample labels, a field logbook, a Chain of Custody Record, and a sample analysis request sheet. Each sample collected will be analyzed by a state-certified laboratory for TPH-mo by EPA Method 8015M. Prior to core drilling and sample collection, drilling permits will be obtained, if required. After the samples are collected, each boring will be backfilled with grout. 1 orkc Engineering,LLC