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Subsurface Conditions <br /> Five borings were advanced at the locations shown on Figures 1 and 2. One boring, B-5 <br /> was not drilled due to proximity of overhead electrical power lines. The surface of the <br /> parcel 5 was covered with asphalt pavements and Parcel 6 with hard packed gravel. Soils <br /> underlying pavements consisted of artificial fill and native clayey silts, sandy silts and silty <br /> clay to depths of about 5-feet. Areas of artificial fill occurred near the former battery <br /> storage area, and in the vicinity of the ground penetrating radar anomalies at HA-4 and HA- <br /> 5. Hand augering and excavation of HA-4 and HA-5 revealed fill consisting of concrete <br /> rubble with rebar,broken pavement and fill sand. <br /> Clayey silt containing sandy silt and silty sand strata occurred below the fill and generally <br /> below depths of about 5-feet. The silt contained caliche and was massive to crudely <br /> bedded. Boring B-2 revealed petroleum contaminated soil from depths of approximately <br /> 10- to 20-feet. The most heavily contaminated zone appeared to be localized at 15-feet. <br /> These contaminants were not observed in nearby Borings B-3 and B-4. Field soil pH <br /> measurements at B-2 and B-3 revealed a soil of pH 6 at depths of 5- to 10-feet. <br /> Groundwater was not encountered in any borehole. <br /> Chemical and Physical Analytical Methods <br /> Selected soil samples from the parcels were analyzed for Total Petroleum Hydrocarbons <br /> (TPH) as gasoline and diesel (TPHG, TPHD) using EPA Method 8015M,Benzene, <br /> Toluene, Ethylbenzene and total Xylenes using EPA Method 8020, for volatile and semi- <br /> volatile organics using EPA Method 8240 and 8270 and CAM 17 Metals. The results are <br /> presented in Tables 1 and 2 below and the analytical reports are attached. A single soil <br /> samples will be collected and tested for R-value using Cal-Trans Test 301, and the results <br /> of that testing are attached. <br /> Table 1. Chemical Analytical Data-Organic Compounds <br /> Sample TPHG TPHD Benzene Toluene Ethylben Xylene VOC-all <br /> No. <br /> mg/kg mglkg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> B-2-11.5 ND 4.5* ND ND ND ND NA <br /> B-2-16.5 17,000 ND ND 570 300 1,700 NA <br /> B-2-21.5 1.3 ND 0.017 0.069 0.013 0.076 NA <br /> B-3-11.5 NA NA ND ND ND ND ND <br /> B-4-11.5 NA NA ND ND ND ND ND <br /> Sample TRPH <br /> No. <br /> mg/kg <br /> B-6-11.5 ND NA NA NA NA NA NA <br /> *-Laboratory reports that the hydrocarbon does not match the diesel standard <br /> ND-None Detected NA-Not Analyzed mg/kg- milligram per kilogram <br /> VOC-all -Analyses by 8240A and 8270A, all analytes reported. Ethylben-Ethylbenzene <br /> Page 3 <br />