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r <br /> E � <br /> ARCAUIS Ms. Lori Duncan <br /> October 8, 2008 <br /> • Approximately ten times the volume of standing water was purged from the <br /> existing monitoring well and newly installed monitoring wells;field parameters <br /> were recorded on a well-volume basis <br /> • After the purge cycle was complete, a groundwater sample was collected for <br /> analysis with a decontaminated '/2-gallon stainless steel bailer and transferred to <br /> the appropriate laboratory-supplied sample containers prefilled with preservative. <br /> Groundwater monitoring and sampling field data sheets for the existing and newly <br /> installed monitoring wells is presented in Attachment 6. Purge water and equipment <br /> decontamination water generated during the sampling event was containerized for <br /> offsite disposal. <br /> Groundwater Analytical Data <br /> Following well development, groundwater samples were collected from monitoring <br /> wells MW-1, MW-2, MW-3, MW-4 and MW-5. Subsequent to collection, samples <br /> were packed on ice, cooled to approximately 4° centigrade, and shipped, under <br /> appropriate chain-of-custody protocols, to Lancaster for analysis. Analyses for all <br /> groundwater samples included the following parameters: <br /> • TPH-GRO (C6-C12), TPH-DRO (C10-C28), TPH-MO (C16-C36), methanol, and <br /> ethanol by USEPA Method 8015 <br /> L • BTEX by USEPA Method 8260B <br /> • TBA, MTBE, ETBE, TAME, DIPE, 1,2-DCA, and EDB by USEPA Method 8260B. <br /> Quality assurance/quality control (QA/QC) samples inclusive of trip blanks were <br /> submitted for laboratory analysis. A laboratory supplied trip blank accompanied each <br /> sample delivery group. QA/QC samples were analyzed for TPH-GRO, BTEX, TBA, <br /> MTBE, ETBE, TAME, DIPE, 1,2-DCA, EDB, methanol, and ethanol for all laboratory <br /> submissions. Analytical results for the groundwater samples collected by ARCADIS <br /> are included in Attachment 7. <br /> Surveying <br /> On July 14, 2008 Muir Consulting, Incorporated (Muir) surveyed top of casing and <br /> rground surface elevations at the newly installed and existing monitoring wells <br /> Page: <br /> C ,lam cisosWflcedatalSacmmento-CA\EMACHEVRONM907a606—bles1RepoftkAs essment1 M75AssessmentRepod_181810950doc 6/10 <br />