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SC&D Boyett Petroleum <br /> 419 South Main Street March 18, 1999 <br /> Ile Manteca, California Page. 4 <br /> by a cement grout to the surface (Appendix B). Seal and filter pack elevations <br /> may change based on the underlying geology. <br /> 3.3 Well Development and Sampling <br />' The well will be developed until the well water appears clear of sediment, or <br /> until an appropriate number of well volumes (based upon the judgment of the <br /> responsible professional) have been evacuated. The water produced during well <br /> development will be containerized and left on-site in 55-gallon drums or other <br /> suitable containers for dispo <br /> ' ei t of laboratory result Disposal will be the responsibility of the Lclientunless other arrangemen s ave een made. a wells wll a owto <br /> nor to sampling. <br /> All soil and groundwater samples will be properly labeled with date collected, <br /> project number, sample coordinator, and sample identification. Field records <br /> will document the above information and other significant data, such as names <br /> of on-site personnel, sampling methods, date and time of sampling, the number <br /> ,! of well volumes removed before sampling, preservatives added (if any), and any <br /> filtration performed on samples. <br /> The samples will be refrigerated immediately for delivery to the laboratory and <br /> will under no circumstances be opened by anyone other than laboratory <br /> personnel. Chain of Custody records will be maintained at all times (Appendix <br /> C). <br /> ' 3.4 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam-cleaned before and <br /> between sampling to prevent cross contamination. Relatively undisturbed soil <br /> samples will be taken at intervals of not more than 5 feet in order to evaluate <br /> the subsurface materials, however, this sampling interval may be waived in <br /> saturated sands in which sample recovery is not possible. <br /> The soil samples will be taken using a California Modified Split Spoon sampler <br /> with brass liners. The sampler will be driven continuously by a wire line <br /> hammer. <br /> ' The laboratory samples wi ve head space and will be immediately sealed <br /> in their liners us' g aluminum foil lined plastic caps. The remaining sample <br />