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10 Treadwell&Wlo <br /> These businesses sold new and used tires and patched, plugged, mounted and dismounted tires <br /> In addition, the earlier business performed frame and wheel alignments Based on these <br /> ' activities, only lubricating grease would have been the type of petroleum product used In 1998, <br /> the City of Tracy demolished the building for the widening of West Grant Line Road There was <br /> ' no contamination or underground storage tanks, drums, wells or septic tanks encountered during <br /> the removal of the building foundation, the concrete pit, and associated parking lot' 24.°'1` `�`9 JW'A z j c.a44 uuda� <br /> sap AU)xec�t <br /> The groundwater at the Site is contaminated with gasoline, diesel, and motor oil There is no <br /> ' evidence that a fueling station or an underground storage tank was ever present at the Site There <br /> are no reported spills or indications of surface contamination at the Site Consequently, there is <br /> no onsite source of contamination The gasoline, diesel and motor oil contamination in they °;� <br /> groundwater is from an offsite source There are numerous potential offsite source areas that <br /> ' have or potentially have contaminated the groundwater with the most likely sources to include <br /> Former Chevron Station and commingled plumes from the Mobil and Scotties Service <br /> ' Stations, <br /> ' • Aged Chevron fuel pipeline along West Grant Line Road, <br /> • Adjacent Self-Service Car Wash, <br /> ' • Former Wheel Country/Service Station and <br /> ' • Former Shell Station(7-11 Store) <br /> ' The contamination found to extend from the former Chevron station to the Tracy Wash & Lube <br /> was also found to extend east onto the Site property Chevron has not adequately characterized <br /> ' the lateral and vertical extent of their plume, and they appear to be the most likely responsible <br /> party for contaminating the Site property <br /> The depth to shallow groundwater vanes from 4 to 7 feet bgs It appears that the dominant flow <br /> ' direction for the area is to the northwest with local variation to the west and northeast Due to <br /> ithe presence of groundwater at such shallow depths, there is additional concern that the utility <br /> 1 <br /> Site Assessment Report 12 21 May 2003 <br /> ' TREADWELL&ROLLO,INC <br />