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i <br /> GROUND ZERO ANALYSIS, INC. <br /> ' 1714 Main Street <br /> Escalon,California 95320 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> � t <br /> July 17, 2001 JUL 18 ZOO, <br /> Ms Margaret Lagono ENVIRONS BT HEALTH <br /> San Joaquin County Public Health Services PERMIT/SERVICES <br /> ' Environmental Health Division <br /> 3 04 E Weber Ave , 3 rd Fl <br /> Stockton, CA 95202 <br /> ' Subject Second Quarter 2001 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California(Figure 1) <br /> 1 <br /> Dear Ms Lagono <br /> 1 <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize groundwater <br /> liesampling activities conducted during the second quarter 2001 at the subject site Site activities <br /> included monitoring groundwater elevations, sampling groundwater from monitoring wells MW1 <br /> through MW 14 and vapor wells VW 1 through VW6, exchanging water level data with Delta <br /> ' Environmental (Delta) the consultant for the ARCO (130 South Wilson Way) site, and surveying the <br /> ARCO wellheads to the 102 S Wilson Way datum <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), methanol and ethanol] <br /> ' The soil vapor extraction system (VES) was not in operation during the second quarter 2001 <br /> The system was shut down pending direction from PHSIEHD with respect to the confirmation <br /> soil borings, and remedial effectiveness evaluation performed in February 2001 <br /> 1 <br /> SITE ACTIVITIES <br /> ' Groundwater Monitoringand Sampling <br /> P g <br /> ' Depth to groundwater was measured on May 23, 2001 in wells MW 1 through MW 14 and vapor <br /> wells VW 1 through VW6 Depth to groundwater was then subtracted from each respective <br /> ' wellhead elevation to determine groundwater elevation On May 24, 2001, a Ground Zero <br /> ' -klq-\?QM2001 <br /> r <br />