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` � t <br /> 5 e <br /> t - <br /> `13 July 2004 <br /> AGE-NC Prod ect No 00-0769 <br />' Page 2 of,7 <br /> r <br /> Purged water was temporarily stored on-site in 55-gallon DOT-approved H-17 storage drums <br />' pending proper disposal <br /> 22- <br /> COLLECTION AND ANALYSIS OF GROUNDWATER SAMPLES <br /> _ r <br />' Ground water samples were collected from wells MW-213 and MW-3B utilizing new, 2-Inch <br /> diameter disposable polyethylene bailers Samples were collected from wells MW-1, MW-2A, <br /> MW-313,MW-4A through MW-913 utilizing 318-Inch or 518-inch diameter polyethylene tubing The <br />' samples were transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18% hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles <br /> were not present In the vials after filling and capping The sample vials were then labeled with the <br />' monitoring well designation,date,time of sampling'and the sampler's initials Following collection, <br /> samples were placed in a chilled container and transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br />' analytical laboratory, and analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> • Method 8015 Modified, and' <br /> VOCs, including benzene, toluene, ethyl benzene and total xylenes (BTEX) and the fuel <br />' additives methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary-butyl <br /> ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), <br /> 1,2-dibromoethane (EDB) and 1,2-dichloro ethane (1,2-DCA) in accordance with EPA <br /> Method 8260B - <br /> ' r <br /> 2 3 WELL HEAD SURVEY <br /> r i <br /> On 20 October 2003, a California state-licensed survey engineer from Baumbach & Piazza, Inc _ <br /> (B&P) surveyed the elevation at the top of the well casing of single-completed monitoring wells <br /> MW_l,MW-2A,MW-213,MW-3A,MW-311 and multi-chamber wells MW-4 through MW-9 to the' <br />' nearest 0 01-foot relative to City of Stockton Bench Mark#184 at 11 44 feet above mean sea level <br /> (msl) The results of the monitoring well survey are contained in Table 1 The surveying report <br /> (B&P) is presented in Appendix C <br /> 3.0. FINDINGS <br /> . <br /> Groundwater elevation,flow direction and gradient were inferred from field data The hydrocarbon- <br /> impact to ground water was quantified by laboratory analysis of ground water samples <br /> Advanced GeoEnviron mental,Inc <br /> + J 1 <br /> h A <br />