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C. Soil and Groundwater Sampling ContiGroup proposes to collect continuous cores for lithologic evaluation and contaminant assessment in at least three of the proposed borings. Soil sampling will be conducted starting at ten feet bgs and will continue at approximately five-foot intervals to the maximum depth of each boring. Sampling frequency will be evaluated in the field, and may be adjusted based on observations of the geologist. A Maley & Aldrich geologist will log the samples using the Unified Soils Classification System. Groundwater samples will be collected from the two deep borings using Hydropunch sampling equipment. D. Laboratory Analysis of Samples All soil and groundwater samples will be analyzed by EPA Methods 8020 and 801 S for TPH(g), TPH(d), benzene, toluene, ethylbenzene and xylenes. E. Quality Assurance/Quality Control The analytical laboratory will adhere to its published QA/QC procedures for sample handling, analyses, equipment operation, and data reporting. Haley& Aldrich will audit the reported quality control data to confine that QA/QC protocols have been met. . F. Decontamination of Field Equipment All equipment to be used for soil and groundwater sampling will be properly decontaminated prior to each use. Drilling equipment will be steam-cleaned and air-dried prior to reuse. Sampling equipment, such as the Hydropunch and soil samplers, will be subject to a three- bucket wash. The three:-bucket wash consists of 1) scrubbing in a tap water and phosphate- free detergent mix; 2) tap water rinse; and 3) a final rinse with deionized water followed by air drying. G. Soil and Ground Water Residuals Management Because we are using a direct-push drilling method, soil cuttings will not be generated. Decontamination water generated during field activities will be stored temporarily on-site. When the analytical results of this work become available, we will complete waste a profile for the stored water and will coordinate appropriate disposal or recycling of this material. 2.03 Site Investigation Report Haley & Aldrich will prepare a Site Investigation Report detailing the results from the field activities described above. The report will follow,where applicable, the guidelines for site investigations in San Joaquin County. The report will include a summary of past work at the site; the purpose and scope for this site investigation; a description of the field activities (including any deviations from this work plan); results; and recommendations.