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3.0 PHASE II LIMITED SUBSURFACE INVESTIGATION ERM-West performed ground water sample collection activities on August 26, and September 7 and 8, 1994. Sample locations were determined during the Phase I and Regulatory Compliance Audit facility walk-through. The location of the ground water samples is shown in Figure 3. 3.1 SCOPE OF WORK The scope of work ERM-West conducted for this field investigation is shown below in italics. Ground water samples were collected from four locations on the subject property. Sampling locations were determined by ERM-West personnel during the Phase I/Audit walk-through. Locations were selected based on an assumed ground water flow direction toward the southwest (Woodward- Clyde 1988), and on the location of the wastewater treatment system and chemical storage area at the subject facility. Ground water samples were analyzed for volatile orgastic compounds (VOCs) using EPA methods 8240, semi-volatile organic compounds (VSOCs) including polynuclear aromatic hydrocarbons (PAHs) using EPA method 8270, and total and dissolved metals using a combination of EPA methods 6010 and 7000. The metals analyzed are those named in the California Code of Regulations Title 22 §66261.24: Ag, As, Ba, Y' Be, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Sb, Se, Tl, V, Zn. 3.2 SAMPLE COLLECTION AND ANALYSES 3.2.1 Methodology Ground water samples were collected from four locations at the subject property (LH-1/LH-1R, LH-2, LH-4, and LH-5) employing the cone penetration testing (CPT)/HydroPunch method. Following collection of erved at 4°G and remained in the ground water samples, samples were pres _ custody of the sampler until submitted to Sequoia Analytical Laboratory for analyses of VOCs, VSOCs, and total and dissolved metals. The HydroPunch employed a probe consisting of a 2-inch steel tube equipped with a detachable 24 uasow.o ERM-WEST.INC.