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26 June 1992 <br /> (GeoAudit CV 45-49C5-1. 10) <br /> Page 2 of 3 <br /> (Alpha Analytical Laboratories in Ukiah) . The samples were analyzed <br /> for total petroleum hydrocarbons (TPH as gasoline and diesel) and <br /> volatile aromatics (BTE&X) . <br /> Soil from the second brass tube was extruded and screened for the <br /> presence of organic vapors using a photo-ionization detector (PID: <br /> Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene) . The <br /> soil was then described in accordance with the Unified Soil <br /> Classification System (see Boring Log) . <br /> The boring was completed as a groundwater monitoring well by the <br /> installation of 0. 020 screen PVC liner from 35 to 54 . 5 feet. <br /> Bentonite pellets were used from 33 to 35 feet and the well was <br /> backfilled to the surface with Portland Cement. <br /> On 4 June 1992 a water sample was collected from the monitoring <br /> well. A PVC bailer was used to surge and purge the well, and <br /> approximately 7 gallons of water were removed from the well to <br /> stabilize temperature, pH and conductivity. The water was stored in <br /> a 55-gallon drum on-site. A water sample was then collected using <br /> a disposable plastic bailer. The sample was collected in two 40 ml <br /> EPA vials and 1 liter amber bottles. The water sample was analyzed <br /> for TPH as gasoline, TPH as diesel and BTE&X. <br /> FINDINGS <br /> The boring penetrated interbedded clay, silty clay, and clayey <br /> sand. The upper five feet of the soil profile consists of backfill <br /> material and gravel. Clayey sand and sandy silt are present from 6 <br /> to 20 feet, and silty to gravelly clay and clayey sand are present <br /> from 21 to 54 . 5 feet. Water was encountered at about 43 feet in the <br /> boring (see boring logs) . <br /> A moderate to strong hydrocarbon odor was present in soil samples <br /> B1-35 to B1--50, but no volatile organic vapors were detected by the <br /> PID. A slight hydrocarbon odor was also present in the water <br /> sample. <br /> Toluene was detected in all three soil samples, ranging from 0. 0075 <br /> to 0. 014 Ag/g (Table 1) . Xylenes were detected only in sample B1-35 <br /> at 0. 0097 µg/g. No benzene, ethylbenzene or TPH were detected in <br /> any of the soil samples. <br /> • In the water sample, TPH as gasoline was detected at 260 µg/L (ppb) <br /> and TPH as diesel was detected at 310 µg/L (Table 1) . No BTE&X <br /> contamination was detected. <br />