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• GROUND ZERO ANALYSIS, INC. <br /> 1714 Main street <br /> Eso-alon, California 95320-1927 <br /> Telephone (249)838-9888 <br /> Facsimile (209)838-9883 <br /> October 29, 2001 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Quarterly Groundwater Monitoring Report,3n1 Quarter 2001 <br /> Tuff Boy Trailers, 5151 Almondwood Drive, Manteca, CA, Site Code 1424 <br /> Dear Ms Duncan <br /> This letter report presents the results of the third quarter 2001 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> SITE ACTMTTES <br /> I <br /> Activities at the site included measuring water level elevations, purging and sampling groundwater <br /> from site wells, and analyzing samples for total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), oxygenated gasoline additives, 1,2-dichloro ethane (1,2- <br /> DCA), and ethylene dibromide(EDB) <br /> FIELD WORK <br /> Groundwater Monitoring and Sampling <br /> Monitoring wells MW1 through MW4 were monitored and sampled on September 10, 2001 <br /> Groundwater elevations were calculated by subtracting the measured depth to groundwater in each <br /> well from the respective wellhead elevation The depth to groundwater in the wells ranged from 5 78 <br /> to 6 61 feet below ground surface (bgs) Groundwater beneath the site rose an average of 0 67 feet <br /> since last measured on June 29, 2001 A potentiometric surface map generated from the September <br /> 10, 2001 monitoring data is shown on Figure 2 The groundwater gradient on September 10, 2001 <br /> was relatively flat, at approximately 0 001 feet per foot, and groundwater flowed generally to the <br />. north-northeast Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are <br /> G\Data\GROUNDZE1TuifBoy\ReportslQMR\3QM2001 doe <br />