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C A M B R I A <br /> Boring SB-5 will be drilled approximately 20 feet east of Boring GP-1 to assess the lateral <br /> extent of MTBE previously detected in Boring GP-1. <br /> The borings will be drilled with Geoprobe drilling equipment. A Cambria geologist will <br /> supervise the drilling and describe encountered soils using the Unified $oil Classification <br /> System and Munsell Soil Color Chart. Soil samples will be collected at five-foot intervals for <br /> lithologic description and possible chemical analysis. Soil samples will be screened in the field <br /> at 5-foot intervals -for organic vapors with an organic vapor meter (OVM). Organic vapor <br /> measurements will be recorded on the boring log for each well. <br /> © Soil samples will be retained in sample tubes and will be covered on both ends with Teflon <br /> sheets and plastic end caps. Soil samples will be labeled, entered onto a chain-of-custody <br /> record and placed into a cooler with ice for transport to a State of California certified <br /> laboratory for analysis. <br /> Each boring will be drilled to minimum f 40 fbg. Field evidence (soil staining, odor, and <br /> OVM measurements) will be evaluated in each boring to determine if petroleum hydrocarbons <br /> or MTBE are present. A boring will be drilled deeper if field evidence indicates petroleum <br /> hydrocarbons or MTBE are present. The boring will be terminate whe ther �nonger <br /> 5eld evidenc petroleum hydrocarbons or MTBE. <br /> Ground Water Sampling: If ground water is encountered in any of the borings, ground water <br /> samples will be collected. Ground water sampling will be performed using Geoprobe ground <br /> water sampling equipment. Ground water samples will be contained in approved sample <br /> containers, labeled, entered onto a chain-of-custody record and placed into a cooler with ice <br /> for transport to a State of California certified laboratory for analysis. <br /> Chemical Analysis: Ground water samples and selected soil samples will be analyzed for <br /> TPPH by EPA Method 8015 (modified), benzene, toluene, ethylbenzene, xylenes (BTEX) <br /> and MTBE by EPA Method 8020, and fuel oxygenates (TAME, ETBE, TBA, DIPE, and <br /> MTBE) by EPA Method 8260. <br /> Report Preparation: Following the receipt of analytical results from the laboratory, Cambria <br /> will prepare a written report which will include field procedures, laboratory results, boring <br /> logs, and conclusions. <br /> The scope of work described in this work plan will be performed under the supervision of a <br /> registered professional engineer. <br /> 240-0955 3 <br />