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. 19 July 2000
<br /> AGE-NC Project No 96-0232
<br /> Page 5 of 29
<br /> containing0 5 ml 18% hydrochloric acid as a preservative Care was taken to ensure that visible air
<br /> Y
<br /> bubbles were not present in the vials after filling and capping Water sample containers were labeled
<br /> with the proper identification and designation, date, time, and sampler's initials
<br /> 3 2 LABORATORY ANALYSIS OF WATER SAMPLES
<br /> Water samples, were logged on a chain-of-custody form, placed in a chilled container and
<br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis
<br /> generally for the following analytes (with the exceptions noted below)
<br /> • Total petroleum hydrocarbons quantified as diesel (TPH-d) by EPA Method 8015 Modified
<br /> • Methyl tertiary butyl ether (MTBE) by EPA Method 8020
<br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene,
<br /> ethylbenzene, xylenes, (BTEX), methanol, ethanol, 1,2-dibromoethane (EDB),
<br /> 1,2-dichloroethane (1,2-DCA), MTBE, tertiary butanol alcohol (TBA), di-isopropyl ether
<br /> (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) by EPA
<br /> Method 8260B
<br /> iThe samples collected on 05 April, 11, 18, 25 May, and 01, 07, 22 June were not analyzed for
<br /> TPH-d The samples collected on 05 April, 11 and 18 May, and 01, 07, 15, 22 June were not
<br /> analyzed for EDB and 1,2-DCA The samples collected on 05 April and 01, 07, 15 June were not
<br /> analyzed for methanol and ethanol The samples collected on 05, 07, 17, 28 April, 11, 18, 25 May,
<br /> and 15, 22 June were not analyzed for MTBE by EPA Method 8020
<br /> 3 3 LABORATORY RESULTS OF WATER SAMPLES
<br /> MTBE was detected in water samples collected during the initial sampling events at concentrations
<br /> as high as 1,800ugll TAME, ETBE, and TBA were detected at concentrations as high as 4 8µg11,
<br /> 1 6ug/l, and 41ugll, respectively MTBE concentrations in water samples have steadily decreased
<br /> to as low as 140 ug/l, but were detected at 160 ug/l for the last sampling event None of the other
<br /> analytes initially detected were detected above the laboratory reporting limits in the last eight
<br /> sampling events
<br /> The analytical results of the ground water samples are summarized in Table 7 Baker tank
<br /> Non-Hazardous Waste Manifests are presented in Appendix B The laboratory report and chain-of-
<br /> custody forms are presented in Appendix E
<br /> Adtianced CcoEn%sronmental, Inc
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