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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209) 838-9888 <br /> Faesunde: (209) 838-9883 <br /> I ' <br /> February 2, 1999 <br /> 1 Mr. Ran Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Quarter 1998 Report, Knowles/Roek Property, 102 South Wilson Way, <br /> Subject Fourth Q po <br /> Stockton, California (Figure 1) <br /> 1 <br /> ' Dear Mr Rowe- <br /> Ground Zero Analysis, Inc. (Ground Zero) has prepared this report to summarize activities <br /> during the fourth quarter 1998 at the subject site Groundwater related activities included <br /> monitoring groundwater elevations, purging and sampling groundwater, and analyzing samples <br /> for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX). Additionally, after approval by San Joaquin County Public Health Services <br /> Environmental Health Division (PHS/EHD), samples from wells MW1, MW3, MW4, MW11, <br /> MW 12, and MW 13 were analyzed for the oxygenated fuel additives methyl tert-butyl ether <br /> ' (MTBE), ethyl tert-butyl ether (ME), di-isopropyl ether (RIPE), tertiary amyl methyl ether <br /> (TAME), and tertiary butyl alcohol/tert-butanol (TBA) using EPA method 8260 <br /> During the fourth quarter 1998 (September 14 through December 31, 1998), the VES operated <br /> for 1,777 hours, removing an estimated 1,350 pounds of hydrocarbons from the subsurface <br /> Since full time operation began on November 19, 1997 the soil vapor extraction system (VES) <br /> ' has operated for 5,742 hours, removing an estimated 10,850 pounds of hydrocarbons from the <br /> subsurface <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> ' Groundwater monitoring was conducted on November 10, 1998 The depth to groundwater was <br /> measured in each well and subtracted from the wellhead elevation to determine groundwater <br /> elevation Water levels fell an average of 0 16 feet since last monitored on August 11, 1998 <br /> 1 <br /> noeklq=Wgm1998 <br />