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24 October 2001 AGE-NC Project No. 01 -0877 Page 4 of 7 3 .2, DRILLING AND SOIL SAMPLE COLLECTION AGE proposes to initially advance four soil probe borings at the site to collect samples for the site assessment. Proposed probe boring locations are illustrated in Figure 2 . Based on soil contamination encountered beneath the former USTs, dispensers and waste-oil fill port, AGE proposes soil probe borings in the following locations : • Adjacent to the northern margin of the UST excavation pit; • Adjacent to the southern margin of the UST excavation pit; • Adjacent to the eastern margin of the UST excavation pit; and Adjacent to the southern margin of the dispensers and waste-oil fill port locations. The proposed probe boring locations may be modified due to field conditions or additional borings may be advanced to determine the lateral extent of hydrocarbon impacted soil and ground water, with approval by the PHS-EHD. Each proposed boring will be advanced to 30 feet bsg or until the field observations and field screeningwith an organic vapormeter (OVM) indicates that detectable petroleum hydrocarbon vapor is not present in the screened soil samples from two consecutive five-foot intervals. At least one boring in the former UST area and one boring in the former dispenser area will be advanced to as much as 40 feet bsg if necessary to collect ground water samples. Soil samples will be collected at 5-foot intervals beginning at 5 feet bsg to the total depth of each boring. Field procedures for advancement of borings and collection of soil samples are presented in Section 4.2. Selected soil samples from each probe boring will be submitted for laboratory analysis. The selected soil samples will be analyzed by a State of California Department ofHealth Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d and TPH-mo) by EPA Method 8015 Modified; • Oil and Grease in accordance with EPA Method 9070; • Volatile organic compounds including benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 8260. Advanced GeoCnvironmental, Inc.