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i 1 <br />' GROUND ZERO ANALYSIS, INC. <br />� 1 . 1714 Main Street <br /> Fscalon, California 95320 �Eca <br /> n <br /> ' Telephone (209)838-9888 <br /> Faesunde (209)838-9883 t �'� ��� <br /> � 1 JAN 2 0 2004 <br /> ENVIRONMENT HEALTH <br /> January 16, 2004 PERMIT/SERVICES <br /> ' Mr Nuel Henderson <br /> San Joaquin County <br /> ' Environmental Health Department <br /> 304 E Weber Ave , 3rd Floor <br /> Stockton, CA 95202 <br /> 1 Subject Fourth Quarter 2003 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> Dear Mr Henderson <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork <br /> conducted at the subject site during the fourth quarter of 2003 Groundwater related activities <br /> '. included monitoring groundwater elevations in all site wells, sampling groundwater from <br /> monitoring wells MW3 through MW6, MW8, MW 10, MW 11 and MW 13B through MW 16B, <br /> ' and sampling groundwater from vapor wells VW4 and VW6 <br /> Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> ' toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene <br /> dibromide (EDB), and gasoline oxygenate additives [methyl-tent-butyl ether (MTBE), ethyl- <br /> tent-butyl ether (ETBE), di-isopropyl ether (DIPE), tent-amyl methyl ether (TAME) and tent- <br /> ' butyl alcohol (TBA)] <br /> The soil vapor extraction system was operated for a short period of time to evaluate the <br /> I ' potential hydrocarbon mass removal rate under current conditions <br /> ' GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on November 18, 2003 in monitoring wells MW 1 through <br /> ' MW16B and in vapor wells VW1 through VW6 Depth to groundwater was then subtracted <br /> from each respective wellhead elevation to determine groundwater elevation Water levels at <br /> the site fell approximately 10 foot since the third quarter event (August 26, 2003) <br /> ' G\GROUNDZE\RQEK\QMR2003\4gm2003 doe <br />