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Canepa's Car Wash 248 E Park Street, Stockton, California aka: 642 N. Hunter Street Phase HSite Characterization and July 2, 1994 Quarterly Groundwater Report (Mary 1994) Page. 4 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 upon the ,judgment of the responsible professional) had been evacuated The water produced during well development and sampling was containenzed and left on-site in 55-gallon drums, or other suitable containers 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(24) hours prior to sampling ' All soil and groundwater samples were properly labeled with date collected, project number, sample coordinator, and sample identification Field records documented 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 by ' Greyhound Package Express and were under no circumstances opened by anyone other than laboratory personnel Chain of Custody records were maintained at all times (Appendix A&B) 1 3.4 Soil Sampling ' All soil sampling equipment was thoroughly steam-cleaned before and between sampling to prevent cross-contamination Relatively undisturbed soil samples were taken at fifteen feet and every five foot interval thereafter in order to evaluate the subsurface materials The soil samples were taken using a California Modified Split Spoon sampler with brass liners The sampler was driven continuously by a 140 pound ware-line hammer repeatedly falling 30 inches The blow counts necessary to drive the sampler were recorded on the Boring Log for each 6 inch interval to help evaluate the consistencies of the materials ' The laboratory samples did not have head space and were immediately sealed in their liners using aluminum foil-lined plastic caps All soil samples were properly labeled with project name/number, date and time collected, sample identification ' and analysis requested Samples were additionally sealed in air-tight plastic bags before being refrigerated for delivery to the laboratory by Greyhound Package Express, and were under no circumstances opened by anyone other than laboratory