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property AST, the presence of the AST is not expected to represent a significant environmental concern. Refer to the Drains, Sumps and Clarifiers segment below for a discussion of a 5,000-gallon AST associated with the forklift cleaning area of the subject property. ELECTRICAL OR MECHANICAL EQUIPMENT LIKELY TO CONTAIN FLUIDS Toxic polychlorinated biphenyls (PCBs) were commonly used historically in electrical equipment such as transformers, fluorescent lamp ballasts, and capacitors. According to United States EPA regulation 40 CFR, Part 761, there are three categories for classifying such equipment; <50 ppm of PCBs is considered "Non-PCB"; between 50 and 500 ppm is considered "PCB- Contaminated"; and >500 ppm is considered ' PCB-Containing". Pursuant to 15 U.S.C. 2605(e)(2)(A), the manufacture, process, or distribution in commerce or use of any polychlorinated biphenyl in any manner other than in a totally enclosed manner was prohibited after January 1, 1977. Transformers The management of potential PCB-containing transformers is the responsibility of the local utility or the transformer owner. Actual material samples need to be collected to determine if transformers are PCB-containing. One pad-mounted transformer was observed on the subject property during the site inspection. The transformer is owned and operated by PG&E, and based on the presumed date of installation, is not expected to be PCB containing. Federal Regulations (40 CFR 761. Subpart G) require any release of material containing greater than 50 ppm PCB and occurring after May 4, 1987, be cleaned up by the Owner (PG&E) following the United States Environmental Protection Agency's (USEPA) PCB spill cleanup policy. Since the subject property was developed in 2000, PCB-containing transformers should be of low concern. No spills, staining or leaks were observed on or around the transformer. Based on the good condition of the equipment, the transformer is not expected to represent a significant environmental concern. INTERIOR STAINS OR CORROSION Minor surficial staining was observed within the subject property warehouse and within one of the subject property kitchens. The staining appears to be from leaking mechanical equipment and/or refrigerators and is surficial in nature. Based on the small size and the surficial nature of the staining, the staining is not expected to represent a significant environmental concern. Additionally, staining was observed within the subject property forklift washing area. Refer to the DRAINS, SUMPS AND CLARIFIERS segment of Section 7.1 below for further discussion. POOLS OF LIQUID A pool of liquid was observed on the floor within one of the subject property offices. The liquid appeared to be water and may have been the result of water intrusion at the subject property. No obvious visual signs of mold growth were observed in the vicinity of the pool. However, repairs to prevent water intrusion and damage in the impacted area should be performed in order to minimize the potential for future mold growth. Project No. 297376 AE1 June 22, 2011 Page 25 i�uil'UlidiiiS