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' Boyett Petroleum January l S, 2001 • 419 South Main Street, Manteca, California Page S Interim Report of Findings for Lateral Extent of Groundwater Contamination ' followed by a cement grout to the surface. ' 3.3 Well Development and Sampling The wells were developed until the well water appeared clear of sediment, or until an appropriate number of well volumes (based on the judgment of the responsible professional) had been evacuated. The water produced during well development was containerized and left on-site in 55-gallon drums for disposal as 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 wells were allowed to stabilize for twenty-four hours prior to sampling. All soil and groundwater samples were properly labeled with date collected, project number, sample coordinator, and sample identification. Field records 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 were refrigerated immediately for delivery to the laboratory and under no circumstances opened by anyone other than laboratory personnel. Chain of Custody records were maintained at all times. The groundwater analytical data will ' be included in the December, 2000 Quarterly Monitoring Report. ' 3.4 Soil Sampling All soil sampling equipment was thoroughly cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples were taken at intervals of not more than five feet (5) in order to evaluate the subsurface materials. All soil samples were screened with a properly calibrated field PID. The soil samples were taken using a California Modified Split Spoon sampler with brass liners. The sampler was driven continuously by a wire line hammer. The laboratory samples did not have head space and were immediately sealed In ..� L-II.*---- 11;__'4 _dr%o Tl•o- rornviin;na sample wac remnved UIVi_ iUMIA L&O"Ir, 1V11V11\J _._a rauvrav --ry i.._ —��_.�--_� ____r__ .. - from its liner to be used as an aide to the on-site specialist in logging the material at ithat depth. 1 1