SITE INFORMATION AND CORRESPONDENCE_1985-1997

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Mr. Mike Infurna January 13, 1992 Page 4 Pacific Avenue and Benjamin Holt Drive. Based upon the contamination levels reported at these stations and their location in respect to the former Unocal site, it is KEI 's opinion that contamination from these sites has not impacted the subject site. It should be noted that the Montgomery Ward's Auto Center, located across from the former Unocal site on Robinhood Drive, appears to have (at one time) contained underground 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 work performed at this site was found in the SJCPHS files. The location of all of the sites discussed in this paragraph are shown on the attached Site Vicinity Map, Figure 2 . The work plan for the four new monitoring wells (as previously discussed) was submitted to the SJCPHS and to the RWQCB on August 23, 1991. Unocal will be requesting site access permission from the property owner (the Stone Bros. ) for the installation of the four new monitoring wells and the destruction of the three remaining on-site monitoring wells. As soon as access permission is received, KEI will obtain all necessary permits and perform the proposed work. As previously agreed with the SJCPHS, based on the results of the ground water samples collected from the new monitoring wells, Unocal and KEI will make additional recommendations for any additional subsurface investigation or remediation work that may be warranted. Lastly, Unocal has reviewed a letter written by Ms. Laurie Cotulla of the SJCPHS, dated September 27 , 1991. This letter acknowledges the receipt of the KEI workplan, and also states that an addendum to the workplan will be required in order to destroy monitoring wells MW3, MW4, MW5, and MW9 . However, as previously discussed, wells MW4 and MW5 appear to be underneath the recently constructed office building, well MW3 was apparently buried and destroyed during the construction of the office building (this well could not be located despite considerable hand and backhoe excavation) , and well MW9 was apparently destroyed and paved over during the construction of the office building parking lot. It is unfortunate that these four monitoring wells were not properly destroyed prior to commencement of construction at the site (Unocal was not notified by the property owner of the construction starting date) ; however, it does not appear to be practical to locate and properly destroy these wells at this point.