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i <br /> I I <br /> E Lr <br /> GROUND ZERO ANALYSIS, INC. 1! 1 9 <br /> r <br /> 1714 Main Street <br /> Escalon,California 95320 <br /> Telephone: (209)838-9888 <br /> Facsimile- (209)838-9883 <br /> ' November 1, 1999 <br /> ' Mr Ron Rowe <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 1999, Report, Knowles/Roek Property, 102 South Wilson Way, <br /> Stockton, California (Figure 1) <br /> Dear Mr Rowe <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize activities during <br /> the third quarter 1999 at the subject site Groundwater related activities included monitoring <br /> ' groundwater elevations, purging and sampling groundwater, and analyzing samples for total <br /> petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) Additionally, as requested by San Joaquin County Public Health Services <br /> ' Environmental Health Division (PHS/EHD), samples from wells MW1, MW3, MW4, MW7, <br /> MW 11, MW 12, and MW 13 were analyzed for oxygenates [methyl tert-butyl ether (MTBE), ethyl <br /> tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), and <br /> ' tertiary butyl alcoholltert-butanol (TBA)] using EPA method 8260 <br /> During the third quarter 1999 (July 1 through September 30, 1999), the Soil Vapor Extraction <br /> ' System (VES) operated for 1,827 hours, removing an estimated 450 pounds of hydrocarbons <br /> from the subsurface Since full time operation began on November 19, 1997 the VES has <br /> operated for a total of 10,751 hours, removing approximately 12,450 pounds of hydrocarbons <br /> ' from the subsurface The system operated properly during the first and second months of the <br /> third quarter 1999 In September, the system shut down several times for unknown reasons <br /> Ground Zero restarted the system each time The system was functioning properly during the <br /> ' most recent maintenance inspection on October 11, 1999 <br /> roeklgm63gm 1999 <br />