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16 September 1998 AGE NC Project No. 95=0197 Page 2 of 7 • Report preparation. ; 2.1. -PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from.the PHS-EHD. As required by PHS-EHD permitting, a health and safety plan will be prepared in'accordance with Occupational Safety and Health Guidance Manual for Hazardous .Waste Site-Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, each proposed well location will be clearly marked and an utility clearance obtained through Underground Service Alert. 2.2. SOIL SAMPLE COLLECTION AND ANALYSIS Initially, AGE proposes to advance four soil borings at-the site.to evaluate the lateral and vertical extent of petroleum hydrocarbon impaction. Each of these borings will be completed as a grou.!J water monitoring well. Proposed boring/well locations are illustrated in Figure 2. B ed.on soil contamination encountered from boring B 1 at depths between 15 and 25 feet below sradebs AGE proposes to install'one u radient round water monitoring well west of g (bsg), p p pg g g B1. second crossgradient monitoring well is proposed.north of B3 based on soil and ground water contamination encountered-from boring B3 at depths Between 15 and 25 feet bsg. wo dditional downgradient ground water monitoring wells are warranted in southeast and east portions of the site based on soil and ground water contamination encountered from boring B6 at depths between 15 and 25 feet bsg. All borings are proposed to be advanced t(ki 5;fff"IZIj However; total depths of borings will be based on field observations and field screening using an organic vapor monitor(OVM). Soil samples will be collected from each boring at five-foot intervals beginning at 5 feet bsg to the total depth. Field procedures for advancement of borings and collection of soil samples are presented in Section 3.2. At least one sample from each boring-will be submitted for laboratory analysis. _ Selected soil samples will be analyzed by a State.of California Department. of Toxic Substances Control (I)TSC)-certified-laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH=g) and diesel (TPH-d) in accordance with EPA Method 8015 Modified/5030; • Volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTEX) and methyl tert- butyl ether(MTBE) in accordance with EPA Method 8020; and Advanced GeoEnvironmental,Inc.