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Canepa's Car Wash 6230 Pacific Avenue, Stockton, California December 30, 1993 Interim Status Report, Phase H Investigation Page, 3 boring The screen and filter pack sizes are as noted on the Bonng/Well Completion Logs (Appendix F) The filter pack extends at least two feet above the perforated zone A bentonite seal two feet thick was placed in the annular ' space above the filter pack followed by a cement grout to the surface Seal and filter pack elevations vaned based on the underlying geology ' 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 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 pnor to sampling 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 twenty 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 driven continuously by a 140 pound wire-line hammer repeatedly falling 30 inches The blow counts necessary to drive the samples were recorded on the boring log for each d 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 immediately refrigerated for delivery to the laboratory, and were under no circumstances opened by anyone other than laboratory personnel Chain of1 T10*nri�r 1nnWJrin rnrn .rr.� ..fin .....J a 11 a .Y__ T_ ......ct,A. .. .A. ` _bill—a,n+auicU ai all Unies he r ernaimng samples were removed from their liners and used as an aide to the on-site geologist in logging the matenal at that depth Soil samples collected for laboratory analysis were analyzed using EPA method 8020 for BTX&E, method 5030/LUFT for total petroleum hydrocarbons - gasoline, and method 3550 for total petroleum hydrocarbons - diesel The bottom