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K L F I N F E L D E R Sample Collection and Handling Procedures The stainless steel hand auger, sampler and sample tubes were cleaned between locations with a LiquinoxO (laboratory-grade detergent) wash followed by a potable water and distilled water rinse. The stainless steel tubes used for collecting the samples were then sealed following collection of the sample with Teflon° sheeting and tight-fitting plastic end caps. After collection, the soil samples were labeled, logged on a chain-of-custody form, and immediately stored in an iced cooler pending transportation to the analytical laboratory. The soil samples were transported under chain-of-custody control to Kleinfelder's office and then transported by courier in a chilled container to Alpha Analytical Laboratory, Inc. (Alpha) of Sparks, Nevada. The chain-of-custody form was signed by each individual who handled the samples, including the sampler and the receiving employee at Alpha Analytical. Alpha is certified by the State of California to perform the analyses requested. The samples were �. analyzed on an standard 10 working day turnaround schedule for completion. ANALYTICAL RESULTS A total of four discrete and one composite soil samples were collected by Kleinfelder and submitted for analysis. The five soil samples were analyzed for the following: • Total Purgeable Petroleum Hydrocarbons (Gasoline Range) [TPH-G] by EPA Method 8015B/DHS LUFT • Benzene, toluene, ethylbenzene,xylenes [BTEX] by EPA Method 8260B `a • Total Extractable Petroleum Hydrocarbons as referenced to Diesel [TPH-D] by EPA Method 8015B/DHS LUFT • Total Lead by EPA Methods ,r a Soluble Lead using Distilled Water Extraction by EPA Methods, and • Five Oxygenates (MTBE, TBA, DIPE, ETBE, and TAME)by EPA Method 8260B A summary of the analytical results is illustrated in the attached Table 1. TPH-D and total lead were detected in one or more of the five soil samples collected from within the trench excavation 6P and associated stockpile. TPH-D was not detected in a sample collected from the northern sidewall at a depth of approximately 5 feet bgs. TPH-G, BTEX, and the five oxygenates were not detected at or above laboratory reporting limits from the five soil samples submitted for #.• analyses. TPH-D was detected at concentrations ranging from 8.6 to 240 milligrams/kilogram (mg/kg) from the discrete samples collected from within the excavation. TPH-D was detected at 13 mg/kg from the composite sample collected from the stockpiled soil. Total lead was detected from discrete soil samples at concentrations ranging from 5.6 to 140 mg/kg. These samples were 20-4659-01.E01/2011 81442 Page 3 of 6 ®2001,Kleinfelder, Inc. November 28,2001