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K r <br /> GROUND ZERO ANALYSIS, INC. <br /> Maui Street <br /> Esca VED <br /> >Jscalon, California 95320 ( u� <br /> Telephone (209)838-9888 <br /> Facsimile (209) 838-9883 SEP 2 7 2006 <br /> ENVIRONMENT HEALTH <br /> September 26, 2006 PERMIT/SEFMCES <br /> Mr Nuel Henderson <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Ave , 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2406 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 second quarter of 2006 Groundwater related activities <br /> included monitoring groundwater elevations in all site wells and sampling groundwater from <br /> select site wells <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 /> dlbromide (EDB), and gasoline oxygenate additives [methyl-tent-butyl ether (MTBE), ethyl- <br /> tert-butyl ether (ETBE), di-isopropyl ether (DIPS), tent-amyl methyl ether (TAME) and tert- <br /> butyl alcohol (TBA)] <br /> GROUNDWATER ACTIVITaES <br /> Groundwater Monitoring and Smnnpling <br /> In conjunction with Stratus Environmental, Inc , who monitored and sampled wells at the <br /> adjacent ARCO site, depth to groundwater was measured on May 30, 2006 in monitoring <br /> wells MW1 through MW17C and in vapor wells VWl through VW6 Depth to groundwater <br /> was then subtracted from each respective wellhead elevation to determine groundwater <br /> elevation Water levels at the site rose an average of 2 78 feet since last measured during the <br /> first quarter event in March 2006 The potentiometrtc surface was above the top of the <br /> screened intervals in monitoring wells MW3 through MW 1313, MW 1513, MW 15C, MW 16B, <br /> MW17C and vapor wells VW1 and VW4 <br /> G IGROUNDZE\ROEK\QMR1200612gm2006 doc <br />