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5 s <br /> • <br /> Soil samples were collected using new disposable plastic sleeves with Teflon tape and plastic <br /> caps placed on the ends The soil samples were analyzed for TPH-gasoline, TPH-diesel, <br /> TPH-motor oil, MTBE and BTEX compounds using EPA test methods 8015M and 8021B <br /> Silica gel cleanup was performed on the shallow soil samples as described in Section 4 3 The <br /> ' soil sample analytical results are provided on Table 3 and in Appendix C <br /> p Yt p pp <br /> 4.2.2 Groundwater Grab Sampling <br /> ' Twenty shallow groundwater grab samples were collected at 8 onsite locations and at 12 offsite <br /> locations(Figure 3) The four deeper groundwater grab samples (TR-7, 14, 18, and 24) were <br /> collected at depths between 12 5 and 19 feet Since water recovery was typically slow, <br /> temporary screens were installed using either a Hydropunch"� 1 75-inch diameter stainless steel <br /> ' filter screen system or a 1-inch diameter PVC slotted casing The screen type, interval, and the <br /> groundwater level measurements are provided on Table 2 The two deeper groundwater grab <br /> samples, TR-14 and TR-24, collected inside the direct-push Hydropunch®screen are indicative <br /> of the deeper groundwater The other two deeper samples, TR-7 and TR-18, may have been <br /> ' influenced by the shallower groundwater since the diameter of the 1-inch PVC pipe screen was <br /> smaller than the diameter of the borehole <br /> Sample collection was achieved by using disposable tubing equipped with a check-valve or a <br /> ' new disposable bailer Visual observations made during sampling included documenting the <br /> presence of hydrocarbon sheen and identifying any unusual odors The groundwater grab <br /> samples were tested for TPH-jet fuel, TPH-gasoline, TPH-diesel, TPH-motor oil, BTEX, and <br /> MTBE compounds using EPA test methods 8015M and 8021B Samples were tested for <br /> TPH jet fuel to evaluate whether the Chevron pipeline may have leaked The groundwater grab <br /> sample analytical results are provided on Table 4 and in Appendix C <br /> ' 4.3 Quality Assurance/Quality Control <br /> . Quality Assurance/Quality Control (QA/QC) measures were taken to confirm the integrity of the <br /> ' field and laboratory data generated during the monitoring program Field QA/QC measures <br /> Field lnva agatwn Report 10 8 December 2003 <br /> ' TREADWELL&ROLLO,INC <br />