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Clayton ENVIRONMENTAL CONSULTANTS Mr. Robert Wooton Page 2 Stockton Savings Bank Clayton Project No. 70448.00 August 30, 1996 • One UST is suspected to be beneath the sidewalk located on the eastern side along San Joaquin Avenue. Information such as the age of the tank, its capacity, its material, and its contents concerning the onsite tank was not available. The evidence of a suspected UST is the piping from the former boiler leading to the eastern wall in the basement fronting San Joaquin Avenue (please see photographs in Appendix A). Clayton did not observe any other piping,fllpipe or vents indicating the location of the suspected UST during the site visit. • In our review of fuel leak cases and sites with other documented problems, we identified 18 fuel leak sites within a 1/2-mile radius, and one site with other documented problems within a 1-mile of the subject site. Five of the fuel leak sites may have negatively impacted environmental conditions of the subject site. We also observed one underground storage tank (UST) and one aboveground storage tank (AST) in the parking lot of the San Joaquin County Courthouse maintenance facility adjacent to and north of the subject site. Clayton recommends an annual check with the San Joaquin County Environmental Health Division to keep updated on remediation and investigation work in progress on the offsite sources of the contamination which could impact the subject site. • During our assessment of the building, we conducted a limited visual survey of suspect ACM. We identified and listed the 13 types of suspect ACM in Section 4.3. The air cell pipe insulation can assumed to contain asbestos due to the history of its manufacturing. As part of the limited survey, Clayton collected three bulk samples of each of the other two types of pipe insulation. These samples were analyzed using polarized light microscopy (PLM). Analysis indicated that both types of pipe insulation contained 40% asbestos. The pipe insulation was observed to be significantly damaged in the vicinity of the presumed former location of the building's boiler. It appears that some of the pipe insulation had been removed. There are still some small pieces of insulation in the removed areas. Some of the ends of the insulation are torn and ragged. We observed pieces of insulation debris on the basement floor. The jackets of some of the insulation appear to have been damaged by moisture and by being physically impacted and are hanging loose. The undamaged ends of the piping are not wrapped. Because of these observations, Clayton recommends that a more comprehensive survey of the building's suspect ACM be conducted. We also recommend that the damaged sections of the identified, or assumed asbestos- KAEMR\P70448N70448ROO.232 f