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ARCADIS September 23, 2013 <br /> Phase II ESA <br /> UPS Freight Lathrop <br /> (CA) <br /> Background <br /> Seven USTs were previously located onsite for the storage and distribution of <br /> petroleum hydrocarbons by a prior tenant and were removed in 1993. However, <br /> historical records indicate that a release of diesel fuel at the site occurred in 1993. In <br /> response to the release of diesel fuel, remediation efforts were completed and site <br /> closure was obtained in 1996. <br /> UPS is interested in purchasing the property from the current owner and initiated an <br /> investigation in the vicinity of the former USTs and dispensers to assess current soil <br /> and shallow groundwater quality; and compare that historical to today's cleanup <br /> standards <br /> Investigation Objectives <br /> The objective of the investigation activities was to assess for the presence of <br /> petroleum hydrocarbons in soil and groundwater in the vicinity of historical USTs at <br /> the site. Approximately seven borings(Figure 2, SB-1 through SB-7)were advanced <br /> at the site in accordance with the methods and procedures described below. <br /> Investigation Methods and Procedures <br /> The following presents the activities completed prior to and during investigation <br /> activities. <br /> Underground Service Alert, Utility Clearance, Permitting, and Access Agreements <br /> Prior to commencement of investigation activities, and in accordance with state law, <br /> Underground Service Alert(USA)was notified of the intent to conduct subsurface <br /> investigations at least 48 hours prior to initiation of intrusive field tasks. The proposed <br /> sampling locations were clearly marked with white paint as required by USA. <br /> In addition to contacting USA, a private utility locator was contracted to assess for <br /> locations of potential underground utilities(e.g., pipes, electrical conductors,fuel <br /> lines, and/or sewer lines)before intrusive work was performed. Each boring location <br /> was also advanced to a depth of five feet bgs using a hand-auger to further evaluate <br /> for the presence of underground utilities. <br /> Page: <br /> G.I MWW P51CeMaNWW*lalM1apl%bu 11 EMUm Popo& M_U3P EIIRMl 2/J <br />