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NOV-16-2001 1215 P.03i20 10 September 2001 AGB-NC Project No. 01-0861 Page 2 of 4 According to the CV-RWQCB IS January. 2001 letter, the maximum and average Ili-leachable Chromium VI repotted.in samples collected-by MonierL.ifetile was 20 micrograms per liter.(pg(L), which may he partially erroneous. AGE was retained to collect sample#from the waste the stockpile located at the subject site it 925 West Anderson Street, Stocktor9.Caisfornia.)&.Ross Atkinson was contacted by AGE to determine the'mamber of samples and obtsW approval of the sampling method prior to collection of samples. Pursuant to#telephone conference with Mr:Atkinson,the scope of work included-the collecdari and analysis of twenty concrete waste file samples. Sample locations were determined using a 20-foot grid pattern over the orginally 200-foot by 280-foot stockplle which was divided into 132 equal grid squares(Fds). Pursuant to the suggestion of W.Atkinson, Et.random number generator was then used to determine the twenty grids to be sampled. Grids sampled are illustrated on Figure 2, After construction of the stockpile map,'but prior to sainpling an 23 August 2001,the stockpile had been consolidaWd and the aerial dimensions reduced; therdbre, some of the randomly selected Vids could not be sampled.Where the randomly-selected Sad could not be sampled,the closest Ascent,unsampled grid was chosen. yi r a .. 2A. WASTI TILE SAMPI.Z COLLECTION PROCMURES Samples were collected on 23 August 2001 utilizing an excavator to pothole in each desired sampling location. samples were oblleeted from the excavator bucket using a metric soil sampler and 2-inch by 6-inch brass sleeves. The sleeves were packed fill of soil to minimize head apace, the ends were covered with TeSbn sheets and were then sealed with a plastic end cap and duct tape. Each sleeve was labeled with the sample identification, collection date and time.and with the sample collectors initials. The preserved sample was thenstaredin a chilled container pending shipment to a OM-certified analytical laboratory under chain of custody for analysis- -Each sample was analyzed for the following; • Total petroleum hydrocarbon`s quay fieri as diesel(TPH-d) by EPA Method 80ISM; +. TPH-d(EPA'80I S"using a WET Method with DI water; and, • IlexavalerA chromium (Chromium VI) by EPA Method. 7196A (Waste Bxtraction Test; - WET)using dc-ionized(AI)water.