ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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FROM Ground 2e-o Analysis PHONE N0. . 2109 952 90=12 Apr. 17 02:20PM PO at depths of approximately 1 and 5 feet below those structures. A soil boring was advanced by hollow stem auger drill rig to a depth of 40 feet next to the leach pit. Samples from this boring were collected for analysis at depths of 27, 35 and 40 feet. During the week of March 24, 1997 confirmation soil samples were collected at three locations or the northeast pardon of the site. The septic tank was loc..ated, and accessed and liquid and sludge samples collected for analysis. LABORATORY ANALYSES As specified in the approved Workplan, samples submitted to the laboratory were analyzed for various constituents either knowr_ or suspected to be present on the property. The suite of analyses for all samples included Total Recoverable Petroleum Hydro-owbons and Total Lead. Samples collected from the sump/septic/leachfield system were also analyzed for Volatile Organic Compounds (solvents, etc.), gasoline and diesel hydrocarbons. Based on the Total Lead results, certain samples were further analyzed for Soluble Lead. The sample with the highest petroleum hydrocarbon concentration was also analyzed for Toxicity by the 96 hour Static Acute Bio-Assay. ANALYTICAL RESULTS Lead: With the exception of soil samples collected at a depth of 1 footon the northeastern portion of the property and the samples collected from within the septic tank Total Lead was found at background levels (+/- 10 ppm) or at slightly elevated concentrations. The samples from the northeastern portion of the property (locations A, B, C and confirmation locations AA, BB and CC) contained moderately elevated concentrations of Total Lead (66 to 200 ppm). These do not exceed the CA Title 22 Threshold Limit Concentration ("TTLC") of 1,000 ppm. The equivalent soluble concentrations in these samples (7 to 22 ppm) do however exceed the Title 22 Soluble Threshold Limit Concentration ("STLC") of 5 ppm. As such the soil in this area has the characteristic of a hazardous waste. The sample of the liquid from within the septic tank contained soluble lead below the STLC concentration (2.6 ppm). The sample of sludge from within the septic tank contained 120 ppm total lead and 0,6 ppm soluble lead. These are below their respective TTLC and STLC criteria. Petroleum Hyder Whons: Samples collected at a depth of 1 foot on the northeastern portion of the property contained moderately elevated concentrations of petroleum hydrocarbons. The suite of analyses run on these samples identifies the contaminant as being characteristic of oily