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t - <br /> t <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> ESCalon, California 95320 �� '� �+��� <br /> Telephone (209)838-9888 J <br /> F'aLsimile (209)838-9883 <br /> JAN 14 2002 <br /> January 11, 2002 ENVIRONMENT HEALTH <br /> Ms Rebecca Setliff PERMIT/SERVICES ' <br /> ,San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , 3rd Fl <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2001 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> Dear Ms Setliff <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize groundwater <br /> sampling activities conducted during the fourth quarter 2001 at the subject site Site activities <br /> included monitoring groundwater elevations in all site wells, sampling groundwater from <br /> monitoring wells MW3 through MW6, MW8, MW 10, MW 1 1 and MW 14 and vapor wells VW2, <br /> VW4, VW5, 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 tert-butyl ether (MTBE), ethyl tert- <br /> butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), tertiary butyl <br /> alcohol (TBA)] <br /> The soil vapor extraction system (VES) was not In operation during the fourth quarter 2001 <br /> SITE ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on December 6, 2001 in wells MW 1 through MW 14 and <br /> vapor wells VW1 through VW6 Depth to groundwater was then subtracted from each respective <br /> wellhead elevation to determine groundwater elevation Water levels at the site fell approximately <br /> 1 86 feet since last monitored in August 2001 <br /> roexigmrk4QM2001 <br />