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1 <br /> 3.0 GROUNDWATER SAMPLING <br />' On April 25 and 26, 1995, groundwater samples were collected from monitor Wells <br /> MW-1 through MW-5 Each well was purged of approximately 3 well-casing volumes using a <br /> clean Teflon® bailer The purge water was collected and placed into a labeled DOT approved <br />' 55-gallon storage drum The purge bailer was thoroughly cleaned with Alconox and triple <br /> rinsed with distilled water prior to its use in each well <br /> After purging each well of three well casing volumes of water, a groundwater sample <br /> was collected from each well using a disposable polyethylene bailer The samples were <br /> carefully poured from the bailer into two 40 ml glass vials (VOA vials) and two 1 liter amber <br /> glass bottles The sample bottles were labeled, recorded on a chain-of-custody form, and <br />' stored in a chilled ice chest for transportation to American Environmental Network (AEN - a <br /> State certified analytical laboratory) A travel blank was prepared using distilled water to <br />' evaluate potential sample contamination Transport and handling of samples were performed <br /> under strict chain-of-custody protocol The groundwater analytical data sheets and chain-of- <br /> custody records are included as Appendix A <br />' The groundwater samples were analyzed for benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX) and purgeable Total Petroleum Hydrocarbons (TPH) using EPA Methods 602 <br />' and 5030, respectively, and extractable TPH using EPA Method 3510 The travel blank was <br /> analyzed for BTEX Results of the historical and recent groundwater chemical analyses are <br />' presented in Table 2 and shown on Figure 3 <br /> 4.0 DISCUSSION OF GROUNDWATER QUALITY <br /> Groundwater samples collected from Well MW-2 continued to yield the highest <br />' concentrations detected at the site Table 2 shows that the compounds detected in the <br /> sample collected from MW-2 gasoline range TPH (TPH-g = 0 9 mg/L), kerosene range TPH <br />' (TPH-k = 0 2 mg/L), benzene (31 µg/L), toluene (3 µg/L), ethylbenzene (40 pg/L), and total <br /> xylenes (13 µg/L) The detected concentrations indicate a small decrease since February <br />' 1995 for TPH-g, TPH-d (non-detect in April 1995), benzene, toluene and ethylbenzene, and a <br /> minor increase in the observed concentrations of TPH-k and ethylbenzene <br /> ��� 2 <br />