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2.0 SAMPLING PLAN The objective of this sampling plan is to study the distribution of DBCP in the soil column underlying agriculture fields where D13CP was his- toricaily applied. The methodologies that will be employed to meet this objective are described below in detail, followed by a description of the sampling protocol that will be adhered to during sampling events. All samples will be analyzed at a California-certified laboratory. 2.1 SAMPLING SITES Sampling sites were selected based on the historical application of DBCP. Specific drilling locations at each site were chosen based on the ease of access, lack of overhead and underground utilities, and mini- mal impact to crops. The drilling sites are names: below: • Parlier: fallow vineyard. • Kings Canyon Road: orchard. Quality Avenue: orchard. • Indianola A-eilue: fallow orchard. � • Lodi: fallow vineyard. 3 Site plans for the proposed drill lacatiun6 are presented in figures 2 - 6 respectively. Soil borings will be drilled using, a truck-mounted hollow•-stern, auger. Continuous soil samples will be collected from ground surface until groundwater is intercepted, Soil siunples will be collected on two-and- one-half foot sampling depth intervals, using an 18-inch long by 2-inch diameter split-spoon sampler lined with three 6=inch stainless steel or brass sample tubes_ The split-spoon sampler will be driven ahead of the hollow-stem auger to collect soil samples. Once the split-spoon sampler has been withdrawn froin the auger, the three 6-inch sampling tubes will be taken from the split-spoon and the soil will ha rlastiified. Soils at the end of each tube will be classified, using visual manual methods (ASTM D 24£8-84) by a qualified geolo- gist. One ox more sampling tubes will then be selected for laboratory 1 analysis. The number of sampling tubes selected for laboratory analysis from each sampling depth interval will be based on: 2.1