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' 30 June 2004 <br /> . AGE-NC Project No 98-0433 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLE COLLECTION <br /> Prior to the collection of ground water samples, the depth to ground water was re-measured in each r <br />' well to ensure that a minimum of 80% of the Initial water volume had recharged Water samples <br /> were then collected from each well using a disposable plastic bailer In addition,a water sample was <br /> collected from the domestic well (DW-1) on the site by allowing the well pump to operate for one <br />' minute, then collecting a water sample from a dedicated sample tap <br /> The water from each monitoring well was transferred into three chilled 40-mi volatile organic <br />' analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative and one <br /> 1-liter amber bottle without preservative Water from the domestic well was poured directly Into the <br /> sample containers from a dedicated sample tap <br />' After collection,the samples were labeled and placed in a chilled container for transportation under <br /> chain-of-custody to Cal Tech Environmental Laboratories, Inc (CTEL), a state of California <br />' Department of Health Services-certified analytical laboratory Each sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified, and, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl <br />' tertiary butyl ether(MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether(ETBE),tertiary amyl methyl ether(TAME), ethylene dibromide(EDB), <br /> 1,2-dichloroethane(1,2-DCA), n accordance with EPA Method 8260 <br />' Modified <br /> 2 3 FREE PRODUCT GAUGING AND RECOVERY <br /> Under the California Underground Storage Tank Regulations,Article 5, Section 2655, free-product <br /> was previously measured and recovered using a passive skimmer deployed in the wells MW-1 and <br /> MW-6 until 07 November 2003 The free-product interface was not detected during the quarter, <br />' however an adsorbent material, or petroleum recovery-sock was placed within the two wells The <br /> filter is hydrophobic and petroleum will collect on the scouring media, without collecting ground <br /> water A set of data sheets from the product gauging events is Included in Appendix A <br /> J <br /> Advanced GeoEnvironmental,Inc <br />