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Mr. Wayne Dietz July 14,2008 <br /> 2154 S. El Dorado Street Investors, a California Limited Partnership Page 7 of 8 <br /> The disposal of the drums will be documented under separate cover. <br /> CONCLUSIONS <br /> Based on our site investigation and review of the sample analytical results, ROKEN has reached <br /> the following conclusions: <br /> The site is a roughly rectangular but irregularly shaped, 1.93-acre property located on the northeast <br /> corner of El Dorado Street and Eighth Street. The most of the site is covered with loose fill soil. <br /> Asphalt concrete surfaces were noted in the western section of the site along El Dorado Street. <br /> Several piles of asphalt and soil were located in the southwestern portion of the site. Four (4) <br /> USTs have been identified in the southwest comer of the site. Others have reported areas <br /> containing buried debris at various on-site locations,primarily in the central and eastern portion. <br /> Soil encountered during this investigation generally consisted of several feet of fill, reddish <br /> brown silty sand and sandy clay with some interbedded graded sand to approximately 25 to 30 <br /> feet bgs, and greenish brown, silty and sandy clay below to depths of approximately 45 feet bgs. <br /> The general water level was measured in temporary well locations at approximately 26 feet bgs. <br /> Smog America, an automobile repair facility is located on the northwest comer of the site. <br /> Quick-N-Save, a gasoline station and market at 2057 S. EI Dorado Street is located <br /> approximately 120 feet northwest of the site, on the west side of S. El Dorado Street. Quick-N- <br /> Save is currently under investigation with SJCEHD oversight due to a reported leaking UST(s) <br /> and subsequent gasoline impact to groundwater. The position of our groundwater sample <br /> locations GW-1 through GW-5 were down gradient of Smog America and Quick-N-Save so <br /> groundwater analytical results could provide an indication of whether releases of hazardous <br /> substances or petroleum hydrocarbons at these sites have impacted groundwater beneath the site. <br /> The VOC and GRO analytical results for samples collected at GW-2 and GW-4 indicate that the <br /> documented gasoline release to groundwater at Quick-N-Save has likely impacted the <br /> groundwater beneath the site in the northwest portion of the site. It is also possible but less <br /> likely, based on site conditions known at this time, that the gasoline detected in groundwater at <br /> GW-2 and/or GW-4 resulted from a release at Smog America or a release on the subject site <br /> itself. <br /> SVOCs were detected in groundwater at all 10 sample locations GW-1 through GW-10. The <br /> concentrations of the SVOCs exceeded the ESLs at all locations. The source of the detected <br /> SVOCs is unknown but they could be associated with material combustion, miscellaneous <br /> debris, pesticides or other materials. <br /> The analytical results for groundwater samples collected from sample locations GW-6 through <br /> GW-10 indicate that there is significant gasoline impact to groundwater in southern portion of <br /> the site which is most likely attributed to gasoline releases from one or more of the on-site USTs <br /> in this area. Low levels of DRO were detected in groundwater at these sample locations but the <br /> levels did not exceed the ESL. Lead concentrations detected in groundwater exceeded the ESL <br /> at three (3) sample locations (GW-7, GW-9 and GW-10). Numerous VOCs which are known <br /> gasoline constituents (including Benzene) were detected at high concentrations in groundwater <br />