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I <br /> E <br /> GROUND ZERO ANALYSIS, INC. L /L 01 <br /> 1714 Main Street L <br /> ' Escalon,California 95320 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> ' October 5, 2001 <br /> Ms Margaret Lagono <br /> ' San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , 3rd Fl <br /> Stockton, CA 95202 <br /> ' Subject Third Quarter 2001 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> ' Dear Ms Lagono <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize groundwater <br /> sampling activities conducted during the third quarter 2001 at the subject site Site activities <br /> included monitoring groundwater elevations, sampling groundwater from monitoring wells MW 1 <br /> tthrough MW5, MW7, MW8, MW9, MW12 and MW14 and vapor wells VWl and VW3 <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 third quarter 2001 <br /> tSITE ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on August 29, 2001 in wells MW l 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 <br /> � 1 <br /> 1 -ek\gmrl3QM2001 <br />