ARCHIVED REPORTS XR0011668 - Laserfiche WebLink

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Clayton F1,41Rd%w%.T#1 ONSiLF�`:+ According to our record review, the site has been used as a bank building since 1961. Two smaller buildings were visible in the 1952 and 1937 aerial photos. We did, not discover any indication of hazardous waste handling or disposal on the subject site. r ' 3.0 ONSEM FINDINGS This section presents our observations made during our site walkthrough. 3.1 UNDERGROUND STORAGE TANKS The use of underground storage tanks (USTs) for storage of hazardous or toxic materials/wastes is regulated on the state and federal level. Underground storage systems can become an environmental liability if a leak results in soil and groundwater contamination. Clayton observed no readily apparent visible evidence of USTs onsite during the site walkthrough. Also, American Savings indicated no knowledge of the existence of any— USTs on the site. However, lack of visible evidence and owner/operator knowledge of USTs does not preclude the possibility that USTs could be present on the site. A tank could have been used without the knowledge of the current owner/operator. Visible evidence of USTs may not be present or may have been obscured from view during the onsite walkthrough. 3.2 PCB-CONTAINING MATERIALS During the site walkthrough, the facility was inspected for the presence of liquid- cooled electrical units (transformers and capacitors). Such units are notable because they may be PCB sources. PCB units may subject the owner/operator to various regulatory requirements. The release of PCB fluids or their combustion products (in the event of a fire) is a potential environmental liability and may require costly remediation. The electrical transformer serving this building was located offsite about 30 feet to the west of the subject site. This transformer is enclosed in a concrete vault under the sidewalk. No leak or spill was observed from this transformer. Clayton contacted Mr. Ernie Phillips of the Stockton Pacific Gas & Electric Company to inquire about the PCB content of the transformer. Mr. Phillips said that this transformer serves the entire block. He added that sampling and analysis would be necessary to determine the PCB content of this transformer. The facility is illuminated with fluorescent light fixtures. Older fluorescent light fixtures have ballasts that often contain PCBs. Fluorescent light tubes contain varying amounts of mercury. Clayton considers the potential for contamination from these fixtures to be low, unless they are very old or are leaking. During our site walkthrough, Clayton noted that the fixtures appear to be of new construction, and that there were no visible leaks. Special concern about the disposal of fixtures is -3- 13724Arep