Laserfiche WebLink
i <br /> • 22 November 1999 <br /> AGE-NC Project No 95-0103 <br /> ' Page 2 of 5 w <br /> 22 GROUND WATER SAMPLE COLLECTION � <br /> Water samples were retrieved from each purged well using new disposable bailers The samples <br /> were transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials containkng 0 5 ml <br /> hydrochloric acid (18%) as a sample preservative, and three samples were collected in one liter " <br /> 'amber bottles The samples were transported in a chilled container under chain-of-custody to m' <br /> McCampbell Analytical, Inc (MAI)a state-certified laboratory in Pacheco, California for chemical <br /> laboratory analyses Samples were analyzed for <br /> ai I <br /> r t� <br /> ' Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Volatile aromatic compounds(benzene,toluene,ethyl-benzene and total xylenes BTEX)and <br /> methyl-tert-butyl ether(MTBE) in accordance with EPA Method 8020 and' ` <br /> • Oxygenating fuel additives tertiary butyl alcohol (TBA),di-isopropyl ether (DIPS), methyl-' <br /> ' Cert-butyl ether (MTBE), ethyl tertiary,butyl ether (ETBE) and tertiary amyl methyl ether <br /> (TAME) in accordance with EPA Method 8260 Modified <br /> 1 <br /> , t <br /> V <br /> ' 3.0. FINDINGS <br /> Analytical data from water analysis are presented below and in Tables 2 through 3 Copies of the I ' <br /> field measurements and laboratory reports are included in Appendices A and B �E <br /> 31 GROUND WATER ELEVATION <br /> t <br /> The ground water elevations were calculated by subtracting the depths to ground water from the L <br /> ' surveyed well casing elevations(Table 1) Ground water elevation decreased approximately 15 feet <br /> between June and September 1999 The upper surface of the saturated zone on the site appears to <br /> be directed off-site toward the southwest(MW-5)and directed off-site towards the,northwest(MW- <br /> 6) There is an apparent ground water ndge on the northern portion of the property near well MW-I, <br /> MW-4 and well MW-6 Figure 3 depicts the ground water elevation contours at the site <br /> . , <br /> 3 2 HYDROCARBON-IMPACTED GROUND WATER <br /> s <br /> Eight water samples were analyzed by MAI <br /> , 1 <br /> Advanced GeoEnwonmcnul,Inc <br />