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16 October 2001 <br /> AGE-NC Project No. 01-0871 <br /> Page 2 of 4 <br /> 3.2. SOIL SAMPLE COLLECTION <br /> Discrete soil samples were collected at 5-foot intervals,beginning at 5 feet bsg,to the total depth of <br /> each boring; soil samples were collected using a Geoprobe soil sampling assembly loaded with four <br /> pre-cleaned 1.125-inch by 6-inch brass sleeves. <br /> Soil samples were preserved by covering both ends of the leading, soil-filled brass sleeve with <br /> Teflon sheets,capping,and sealing with tape.Each sample sleeve was labeled with soil probe boring <br /> location, depth, time, date and sampler's initials. <br /> Selected samples from the UST locations were logged on a chain-of-custody form, placed in a <br /> chilled container and transported to a California Department of Health Services (DHS)-certified <br /> laboratory for analysis for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M; <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl tertiary-butyl ether(MTBE) - in accordance with Method SW846 8021; and <br /> • Lead in accordance with Method SW846 6010B. <br /> 3.4. EQUIPMENT DECONTAMINATION <br /> Prior to sample collection, soil sampling equipment was thoroughly rinsed with clean water after <br /> washing with a solution of Alconox. Geoprobe rods were thoroughly cleaned prior to soil probe <br /> boring advancement. <br /> 4.0. FINDINGS <br /> Soil descriptions (lithologies), were determined from field data. Hydrocarbon impact to soil was <br /> characterized from field and laboratory analytical data. <br /> 4.1. STRATIGRAPHY <br /> The soil boring samples indicate that the vertical soil profile consisted of an orange brown,medium <br /> sand(which may be fill material)from the surface to approximately 5 feet bsg, an orange brown silt <br /> Advanced GeoEnvironmental,Inc. <br />