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22 May 2007 AGE-NC Project No. 97-0360 Page 2 of 6 Prior to mobilization. the proposed probe boring will be clearly marked and a utility clearance obtained through Underground Service Alert. 22. SOIL AND GROUND WATER SAMPLE COLLECTION AND ANALYSIS AGE proposes to advance six soil probe borings for the collection of shallow soil and ground water samples using direct push technology;the proposed probe boring locations may be modified due to field observations. The proposed probe boring locations are presented below and on Figure 2: • One boring approximately 84-to 85 feet southwest of EW-1 (total depth approximately 15 feet bsg, previously approved); to investigate the shallow soil and ground water south of the former UST area. • A second boring approximately 25 feet south of well MW-1, to investigate the shallow soil and ground water south of the fon-Ier UST area. • A third boring,approximately 20 feet west of well MW-3 (total depth approximately 10 feet bsg); tQ_invtestigate t-he shallow soil and ground water s� the former UST ar(, to investigate the shallow soil and ground water west of the former UST area. • A fourth boring, at well MW-1 (total depth approximately30 feet bsg) to investigate the shallow soil and ground water west of the former UST area. ti. • A firth boring,approximately 35 to 40 feet north of well MW-4(total depth approximately 15 feet bsg) to investigate the shallow soil and ground water north of the former UST area.. • A sixth boring, at well EW-I (total depth approximately 15 feet bsg) to investigate the shallow soil and ground water at the former UST area. As each boring is advanced, soil samples will be collected at 5-foot intervals beginning at 5 feet bsg and extending to the total probe boring depths. In addition, grab ground water samples will be taken in all borings at first encountered ground water. Ground water and selected soil samples from each probe boring will be submitted for laboratory analysis. Adequate shallow(five feet bsg)and deeper(15 feet bsg) soil samples will be analyzed to fill data gaps and provide a comprehensive delineation of deep soil contamination. The selected samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015M; and Advanced GeoEnvironmental,Inc.