ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL

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FROM Ground Zero Analysis PHONE NO. : 209 952 9992 Sep. 30 i99G 04:37RI F3 'lull Roy's Towing Page 2 concentrations of petroleum hydrocarbons and/or lead. The sample collected from the sump contained elevated lead concentrations and detectable levels of petroleum hydrocarbons. Prior to the Right of Way (ROW) acquisition, Kaldveer Associates (Kaldveer) performed a soil quality investigation for CalTrans on the eastern portion of the site shown on Figure 2. In June 1991, Kaldveer drilled 33 exploratory soil borings in the acquisition area to depths of 10 feet below ground surface (bgs). Soil borings were located in a grid-like pattern, but some were shoved to locations of apparent staining. Three near-surface soil samples collected by hand, and a total of bb soil samples collected from the borings at depths of 1 and 4.5 feet bgs were submitted to a CalTrans-approved laboratory. Selected samples were analyzed for total recoverable petroleum hydrocarbons (TRPH), total petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd, respectively), benzene, toluene, othyibenzone, total xylenes (BTEX), halogenated volatile organic compounds (HVOCs), ethylene glycol, CAM 17 metals and total lead. The results of the Kaldveer investigation delineated three possible areas of contamination. "Area I", located in the vicinity of the workshop, had indications of surficial (less than 4.5 feet) petroleum hydrocarbon contamination. One sample collected in this area also had an elevated concentration of lead. "Area II" (located south of the work shop) and "Area III" (made up of three individual locations near the southern portion of the ROW acquisition area) had equivocal evidence of surficial petroleum hydrocarbon contamination. Evidence of petroleum hydrocarbon contamination consisted of detectable levels of TRPH, +/-TPHd. It should be noted that TRPH was not detected in any of the samples collected from a depth of 4.5 feet. Detectable levels of "TPHd" were reported in nearly every sample analyzed, mostly at very low concentrations near the laboratory detection limit. The laboratory reports, however, indicated that all samples that contained detectable "TPHd" were "atypical of diesel fuel.." The TPHd results in general are considered by Ground Zero to be highly suspect. TPHg and benzene were not detected in any sample analyzed. The locations of the areas of concern are shown on Figure 2. Ethylene glycol was not detected in any sample analyzed. Very low levels of methylene chloride and trichlorofluoromethane ("Freon 11") were reported in a number of samples collected from the CalTrans ROW. The source of the reported methylene chloride was most likely in the laboratory. The source of the Freon may possibly have been the laboratory as well. We understand that CalTrans excavated and removed suspected contaminated soil from the ROW area. Based on the results of the DHS and Kaldveer sampling, the Superior Court ordered the owners of the property to conduct a soil investigation.