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Fuller Mobile Home Park ' 365 F_ Louise Ave., Lathrop, California December 20, 1993 Phase II Site Characterization Page. 3 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 was containerized 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 is 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 the 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 mnphn& preservatives added (if any) and any filtration performed on the samples The samples were refrigerated immediately for delivery to the laboratory and under no circumstances were opened by anyone other than laboratory personnel Chain of Custody records were maintained at all times(Appendix B) 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 intervals of not more than 5 feet in order to evaluate the subsurface materials, however, this sampling interval may be waived in saturated sands in which sample recovery is not possible The soil samples were taken using a California Modified Split Spoon sampler with brass liners driven continuously by a wire line hammer ' The laboratory samples did not have head space and were immediately sealed in their liners using aluminum foil-lined plastic caps The remaining samples were removed from their liners to be used as an aide to the on-site geologist in logging the material at ' that depth Soil samples collected for analysis were analyzed using EPA method 8015 modified for total petroleum hydrocarbons in the gasoline range, EPA method 3 510/LLTFT for diesel range petroleum hydrocarbons and EPA method 8020 for BTX&E compounds The minimum detection limits used for each analyte were 0 005 mg/kg for BTX&E,