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WR MIM ME ....... t I Ev.; M�79 ................ propent In the roll and In not likely to mialtuid the clisint or contractor Into offhnullng or backfilling with coli 11tockpiler. that are relativcly clonn tit the nurfaco, but unacceptably contaminated through thn remainder of their volume. a CONFIRMING SAMPLES OP STOCKPILED MATH'RIAL'. SLIMP)MI were obtained of stockpiled material left on the site after the excavation of the main ganolina ctoraga tanks. Sample collection paints; were laid out in a pattern designed to survey the entire area over which the material had boon spread. The SURVEY designation indicaten that the pattern was selected prior to digling into the subject material. At cacti sampling point in the pattern the surface soil wan dug away and sample material was obtained from a depth of nix or more inches below the noraled surface. This wan done to avoid Including the surface soil which was presumed to be thoroughly aerated and obtain coil that wan not open to the air In order to confirm that the material was sufficiently aerated to require no further handling(. SAMPLE CONTAINERS Our firm uses new sample containerr of the type upecified by either EPA or the RWQCB for the collection of samples at cites whero underground storage tanks are involved. Water samples are contained in 40 ml volatile organic analysis vials (VOAs) when analysis for gasoline rand similar light volatile compounds is Intended. Those containers are prepared according to EPA SW 846 and will contain a small amount of preservative when the analysis in for TPII an gasoline or EPA 602. Vials intended for EPA 601 analysis and EPA 624 GCMS procedures are not preserved. Closure in accomplished with an open headed (syringe accessible) plantic screw cap brought down on top of a Teflon faced septum which is used to caul the sample without headapace. Water samples intended for Betnivolatile and nonvolatile analysis such as total oil and grc"c (TOG) and diesel (TPII 11131') are collected and transported in properly prepared new glass liter bottles. Dark amber glass is used in the manufacture of these bottles to reduce any adverse effect on the sample by sunlight. Antimicrobial preservative may be added to the sample liquid it a prolonged holding time In expected prior to analysis. Closure is accomplished with a heavy plas.1c: scraw cap. Soil samples for volatile, sem'votatile and nonvolatile analyses are all collected in properly prepared now brass liners which are 2 inches in diameter by 4 Inches In length. Closure is accomplished with press fit plastic end caps which Are fitted to the open ends or brass tube after a sheet of aluminum [oil in wrapped over the exposed sample material. A non- contribuL(ne/nonbubtractive tape In wrapped completely around the joint arena where the plastic caps meet the outer wall of the brass tube. No preservative-other--than cold storage-Im-u&cd-an gampicr. captured-in-r4mPla containers of this typo. Sampling Report 88280-M-2 Chevron 1918 SECTION THREE/page 8