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UST Closure Report November 10,2040 6425 PacX1c Avenue Project No 3954 Stockton,Cahforma _ _ _ Page 2 Soil samples were collected from six temporary borings at the locations shown on Figure 2 to determine if petroleum hydrocarbons constituents are present in native soils beneath the three former USTs Each bonng was continuously logged from a depth of 16 feet bg to the termination of the boring The purpose of this logging was to identify the depth of the backfill- native soil contact so that a native soil sample could be collected approximately two feet beneath this contact This sample depth was requested by the SJC-EHD Boring logs for the six temporary borings are included in Appendix D Soil samples were collected using a 3-foot long Geo-probe sampling core tube lined with 6 brass tubes The brass tube that was collected from 2 feet below the pea-gravel/native soil contact was selected for sampling Immediately after collecting the sample, the ends of the brass tube were covered with Teflon sheets and end caps were placed such that an airtight seal was maintained Soil from each sampled interval was placed in a zipiock baggie and placed in the sun for at least 112 hour The probe of an Hnu photo ionization detector (PID) was placed in the headspace of the baggie aifec this elapsed time and a reading of the total ionizable organic vapors was noted None of the bagged samples yielded detectable ionizable organic vapors These PID readings are recorded on the boring logs in Appendix D Since the backfill material will be excavated from the UST excavation prior to installation of the new USTs, Mr Michael Infurna granted a waiver to the grouting requirement for the temporary borings A copy of the letter granting the waiver of the grouting requirement is provided in Appendix E The samples were labeled in the field indicating project name (or number), sample number, sample depth, and date The same information was recorded on the chain of custody form Soil samples were placed in a cooler with ice and were delivered that same day to McCampbell Analytical,Inc in Pacheco, California The six soil samples were analyzed for TPH-g by EPA Method 8015 (modified), benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8020, and fuel oxygenates (MtBE, TAME, DIPE, ETBE and TBA) and lead scavengers (EDB and 1,2-DCE) by EPA Method 8260b 4.4 Soil Sample Results Sample ID TPH-S benzene toluene eth lbenzene xylenes MtBE 134A ND ND ND ND ND ND 134B ND ND ND ND ND ND B-5A ND ND ND ND ND ND 13-513 ND ND ND ND ND ND B-6A ND ND ND ND ND ND 13-613 ND ND ND ND .. ._...,_._,ND ND 11Tom1d\Centml Project Fr1e13954 Mason Swckton\UST Closure ReportlUST Closure Report doc