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CBoyett Petroleum May 18, 2000 419 South Main Street, Manteca, California Page 5 Work Plan for Lateral Extent of Groundwater Contamination (Adden(lum) placed in the annular space above the filter pack followed by a cement grout to the surface. Seal and filter pack elevations may change based on the underlying geology (Appendix Q. 3.3 Well Development and Sampling The well will be developed until the well water appears clear of sediment, or until an appropriate number of well volumes (based on the judgment of the responsible professional) have been evacuated. The water produced during well development will be containerized C and left on-site in 55-gallon drums of other suitable containers for disposal of hazardous waste if deemed necessary upon receipt of laboratory results. Disposal will be the responsibility of the client unless other arrangements have been made. The well will be Callowed to stabilize for twenty-four hours prior to sampling. All soil and groundwater samples will be properly labeled with date collected, project number, sample coordinator, and sample identification. Field records will document the above information and other significant data, such as names of on-site personnel, sampling methods, date and time of sampling, the number of well volumes removed before sampling, preservatives added (if any), and any filtration performed on samples. The samples will be refrigerated immediately for delivery to the laboratory and will under no circumstances be opened by anyone other than laboratory,personnel. Chain of Custody records will be maintained at all times (Appendix D). 3.4 Soil Sampling All soil sampling equipment will be thoroughly steam cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples will be taken at intervals of not more than five feet (5') in order to evaluate the subsurface materials, however, this sampling interval may be waived if saturated sands are encountered in which sample recovery is not possible. All soil samples will be screened with a properly calibrated field PID. The soil samples will be taken using a California Modified Split Spoon sampler with brass liners. The sampler will be driven continuously by a wire line hammer. The laboratory samples will not have head space and will be immediately sealed in their liners using Teflon® lined plastic caps. The remaining sample will be removed from its liner to be used as an aide to the on-site specialist in logging the material at that depth. 6.