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I <br /> EEC 5411-4 UniFirst Stockton August 8,2002 <br /> psConfirmation samples will be collected as follows <br /> o Notify the SJCDEH prior to collecting any confirmation samples, so that SJCDEH <br /> can be present for sampling, if necessary <br /> o All samples will be collected in brass sample sleeves or laboratory grade sample jars <br /> ' Samples will be labeled with the date and time sampled, project number, and unique <br /> sample identification number Samples will be placed on iced storage for transport to <br /> a State of California laboratory certified to perform the requested analyses, utilizing <br /> ' proper Chain of Custody protocol If a mobile laboratory is utilized, the sample will <br /> be entered on the Chain of Custody and transferred immediately to the mobile <br /> laboratory for analyses <br /> ' o Sampling Locations - Samples will be collected from the bottom and sides of the <br /> final excavation, as well as from the excavated soil Samples may also be collected <br /> ' during excavation of know hydrocarbon-impacted soils to monitor the progress of <br /> remediation These samples will be collected as follows <br /> ■ Excavation Base The base of the excavation will be divided into 15 foot <br /> (225 sq ft) grids One sample will be collected from each fifteen foot sample <br /> grid <br /> ' ■ Excavation Walls Samples from the excavation walls would be collected at <br /> staggered depths along the vertical profile Samples would be collected at 5 <br /> foot depth increments at each wall (example a 20 foot deep excavation <br /> would require a sample at a depth of 5, 10, and 15 foot depth) <br /> ' Stockpiled Soil Soil destine for offsite disposal will be sampled at intervals <br /> of one sample per 100 cubic yards, or more frequent if required by the <br /> disposal facility Soil which is being tested for possible re-use at the site will <br /> ' be sampled at intervals of one sample per 50 cubic yards or more frequent <br /> o Laboratory Methods—All samples collected during excavation and confirmation <br /> ' testing will be analyzed for total petroleum hydrocarbons (TPH)by Environmental <br /> Protection Agency Method (EPA) 8015 modified for gasoline and diesel fuel and for <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX)and methyl-tertiary butyl ether <br /> (MTBE)by EPA Method 8020 Due to the age of the reported gasoline station <br /> (1950), no MTBE or other fuel oxygenates are anticipated <br /> 1 <br /> 1 <br /> 1 � <br />