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<br />C:\TRICH\Jobs\4515582 Leprino Tracy\Report\Leprino Tracy CalARP 040221.docx 4-1 <br />4. Summary and Recommendations <br />4.1 Summary <br />A seismic assessment for equipment containing State Regulated Substances per <br />California Accidental Release Prevention (CalARP) Program was performed. The <br />475-year return period peak ground acceleration at the site was determined to <br />be 0.541g. The high level of ground shaking is due to proximity of the site to the Great <br />Valley Fault. Secondary seismic hazards such as ground rupture, soil liquefaction, and <br />slope failure were determined not as significant as that of ground shaking. <br />A detailed seismic walkdown review was performed on September 23, 2020 for the <br />CalARP regulated equipment to (1) screen out equipment that is inherently seismically <br />rugged; (2) identify potential seismic vulnerabilities of the equipment and piping; <br />(3) observe signs of deterioration or damage to the regulated equipment; and (4) collect <br />pertinent data for additional seismic analyses. <br />Only the structural integrity of the equipment anchorage or support system has been <br />evaluated. The seismic capacities of the observed vessels and equipment were <br />generally found to be adequate for an earthquake ground motion with a mean return <br />period of 475 years and they have sufficient structural integrity for storing hazardous <br />chemicals. Noted exceptions are identified in Chapter 3. Recommendations to mitigate <br />any observed deficiencies are presented below. <br />Where potential collapse of a structure may cause damage to the equipment or piping <br />containing regulated substances (resulting in release), the structure was evaluated as <br />part of this study. There are no structures in the immediate vicinity that pose a risk to <br />the regulated substance equipment or piping