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KLEINFELDER SOIL STOCKPILE One four point composite sample was analyzed from an approximately 75 yard stockpile located approximately 100 feet west of MW -3. The stockpile was reportedly generated during excavation of soil from the former UST area. The composite sample was analyzed for petroleum constituents as listed in Section 4.6.4 (see Table 5 for results). TPH-D and TPH-MO were detected at 83 and 190 mg/kg. Total lead was detected at 12 mg/kg, respectively. Based on these findings, it appears diesel and motor oil impacted soil remain in this stockpile 5.2.3 Deep Soil Boring and Well Boring Soil Sampling Results FORMER UST AREA Three deep borings (DB -1, DB -2 and DB -3) were advanced in two former UST areas at the subject site (Plate 4). A total of seven soil samples were collected in this area and analyzed for various petroleum constituents as listed in Section 4.2. The two excavation areas were easily identified due to two large asphalt patch areas. Based on a past report by Weston Consultants the USTs were removed and contaminated soil was excavated from the UST areas. Reportedly a formulated all tank was located in the northern -most excavation and a former weed oil tank and unleaded gasoline tank was located in the southern excavation area. The former NOA ESA noted that although petroleum impacted soil was excavated, that petroleum impacted soil remained at depth (southern excavation) and that there was a potential for petroleum constituents to impact groundwater beneath this area. DB -1 was advanced to a total depth of approximately 30 feet bgs through the northern excavation area. Two samples were collected at depths of approximately 16 and 31 feet bgs. The analytical results were reported as non -detect at or above laboratory reporting limits for various petroleum constituents including oxygenates. Additionally, discolored soil or petroleum like odors were not noted from cuttings or soil samples collected at this location. Based on the field observations and analytical results it does not appear petroleum impacted soils remain in this UST excavation at the explored depths and location of DB -1. Two borings, DB -2 and DB -3 were advanced in the former southern UST area to approximately total depths of 50 and 30 feet bgs, respectively. Two soil samples collected in the western portion of this excavation area (DB -3) at depths of 15 and 30 feet were reported as non -detect for the various petroleum constituents. Three soil samples were collected in deep boring DB -2 advanced in the eastern portion of the southern excavation in the estimated area of remaining contaminated soil. The three soil samples were collected at depths of 30, 40 and 50 feet bgs. TPH-D, TPH-G, toluene, ethylbenzene and total xylenes were detected at elevated levels in this sample. However the 40 foot sample had markedly lower concentrations of these same analytes, some of which were non -detect. The 50 foot sample was reported as non -detect for all requested petroleum constituents. Field observations indicated discolored soils with petroleum like odor from depths ranging from 25 to 45 feet bgs. Based on this data, it appears petroleum impacted soil remains in the eastern portion 362741 sTQ3R1919 Page 14 of 19 12004 Kleinfelder, Inc. January 3, 2004