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penetration cone. The probe was driven into the subsurface materials and then <br /> retracted from the cone to expose a screen to the water bearing zone. Ground <br /> water at the subject facility was encountered at approximately 28-feet below <br /> ground surface. <br /> - Ground water samples were collected with a stainless steel bailer that was <br /> lowered into the screen. The bailer was steam cleaned between sample <br /> locations to prevent cross-contamination. Following sample collection, the <br /> CPT borings were backfilled to grade with bentonite grout. <br /> Due to unanticipated subsurface conditions at the subject property (i.e., <br /> silty/clayey sediments and an extremely slow ground water recharge), ground <br /> water samples were only collected from four (LH-1/LH-R, LH-2, LH-4) LH- <br /> 5) of the six proposed sample locations noted in the original proposal. ERM- <br /> West attempted to collect samples from the six proposed locations. Due to <br /> subsurface conditions, however, sufficient quantities of ground water for the <br /> required analyses were unable to be obtained. Sampling location LH-2 yielded <br /> i insufficient water to collect enough sample for VSOCs and metal analyses. <br /> i <br /> 1, Analytical Results <br /> A summary of ground water analytical data is included in Table 1. Laboratory <br /> analytical data sheets and chain-of-custody documentation are included in <br /> Appendix G. All ground water samples collected and analyzed were highly <br /> Iturbid. <br /> 3.2.2 Sampling Location LH-11LH-IR <br /> 1 Samples from location LH-1/LH-IR were analyzed for VOCs, VSOCs, and <br /> total and dissolved metals. Location LH-1R is adjacent to location LH-1. <br /> Due to subsurface conditions and slow ground water recharge, only sufficient <br /> quantities of ground water for VOCs analysis were obtained from location LH- <br /> 1. Therefore, ERM-West personnel collected samples for VSOCs and metals <br /> analyses from location LH-1R. Based on an assumed ground water flow <br /> direction toward the southwest, location LH-1/LH-1R is considered the most <br /> down-gradient sampling point at the subject property. <br /> 1 VOCs were not detected above method detection limits in the samples from <br /> this location. VSOCs diethyl phthalate and phenol were detected at 4.6 <br /> micrograms per liter (gg/L) and 5.8 gg/L, respectively. <br /> L� <br /> 25 uesooc.a <br /> —I ERM-WEST.INC. <br />