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KEI-P88-1013 .R2 • July 15, 1992 Page 5 during the site excavation and were unsecured. Wells MW4 and MW5 appeared to be located beneath an office building recently constructed on the site. Well MW9 appeared to have been paved over during construction of a parking lot for the new office building. The conditions of the wells obscured by the building and parking lot were unknown to KEI . Well MW3 was unable to be located despite considerable hand and backhoe excavation in the vicinity. In addition, as previously mentioned, wells MW1 and MW7 were properly destroyed during the soil excavation project that was performed at the site. 2 . Based upon KEI 's site inspection, KEI recommended that all of the on-site wells that were located (MW2 , MW8 , and RW1) be properly destroyed. It was KEI ' s opinion that the damage inflicted on these wells during construction of the new office building was severe enough that any future sampling results obtained from these wells may not be representative of the actual conditions at the site. Well MW6 appeared to be intact and would remain as is; however, this well was dry. KEI recommended that four new monitoring wells be installed at the . site in order to determine the present ground water quality at the site. 3 . A review of all past or present environmental investigations performed in the vicinity of the subject site was conducted. The review of SJCPHS files revealed that subsurface investiga- tions at four sites in the area have been conducted. These sites are as follows: 1. ) a Chevron service station, located at the corner of Pershing Avenue and Robinhood Drive, 2 . ) a Shell service station, located at the corner of Pacific Avenue and Porter Avenue, 3 . ) a former Regal (now Exxon) service station, located at the corner of Pacific Avenue and Douglas Road, and 4 . ) a Chevron service station, located at the corner of Pacific Avenue and Benjamin Holt Drive. Based upon the contamination levels reported at these stations, and their locations with respect to the former Unocal site, KEI con- cluded that contamination from these sites had not impacted the subject site. It was noted that the Montgomery Ward' s Auto Center, located across Robinhood Drive from the former Unocal site, appeared to have, at one time, contained under- ground storage tanks. An inspection of this site revealed areas of concrete and asphalt disturbances that appeared to be the locations of former pump islands and underground storage tanks. However, no record of any subsurface investigation work performed on this site was found in the SJCPHS files. The locations of all of the sites discussed in this paragraph are shown on the attached Adjacent Sites Location Map, Figure 5 .