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k' ■ KLEINFELDER 3 BACKGROUND Kleinfelder conducted a Phase I Preliminary Environmental Site Assessment (ESA) and Limited Phase II Assessment of the property identified as the future grade separations on March Lane at the Union Pacific Railroad (UPRR) and the Southern Pacific Railroad (SPRR) crossings in Stockton, California. The ESA was completed in accordance with the scope and limitations of our proposal (20-3712-08 dated April 10, 1996) and ASTM Practice E1527-94. One of the items of concern was as follows. Two of the six Cortese listed facilities and a PHS/EHD listed facility that all occupied the same location (BP #11190, Mobile Service Station, and Tosco Northwest Company No. 11190, all located near the UPRR site) have the potential to adversely impact the UPRR site soil and groundwater. It is unknown if releases from these facilities have had an impact on groundwater. In addition, the vertical and lateral extent of soil contamination is unknown. Although the contamination may exist beneath the subject property, it is unlikely that it would encounter the actual work zone. The remaining four Cortese facilities, a LUST facility, and a Cal-Sites facility (Nor Mac, Inc., Fire Station #II, St. Mary's High School, Arnaiz Development/Palm Plaza Center, AAMCO,Coit Drapery Service,and HF Hawley Chemical Company)are unlikely to have an impact on the subject property because of their distance to the site and the contamination of soil only. However, if contamination arises on the subject property, clean-up is usually the responsibility of the responsible party, e.g. Tosco, Mobil, BP, AAMCO, etc. For clarification, Palm Plaza Center is located adjacent to the south of the UPRR site. The other facilities are located approximately one half to one mile from both sites. At the time of our previous ESA, the underpass project was not anticipated to encounter groundwater. It is our understanding that construction of the drilled shafts at the UPRR site will now encounter groundwater. Because the quality of the site groundwater is unknown, Kleinfelder recommended either using a shallow foundation system or sampling and analyzing site groundwater for Total Petroleum Hydrocarbons (TPH) as referenced to gasoline, Total Extractable Petroleum Hydrocarbons (TEPH) as referenced to diesel and motor oil, Benzene, Toluene, Ethylbenzene, and Xylene (BTEX), and total lead related to reported releases from Tosco, Mobil, and BP facilities. The main concerns if groundwater contamination exists is potential exposure of workers to the contamination and the handling and disposal of the contaminated soil/groundwater. The results of the subsequent investigation are detailed in this report as follows. 20-3712-08.E01/2018R510 Page 5 of 16 0 1998, Kleinfelder. Inc. July 9, 1998