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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 P, .�� Q <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> Apn1 19, 2001 <br /> Mr Jeffrey Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fust Quarter 2001 Groundwater Monitoring and Sampling Report <br /> Speedy Mart, 8200 N Highway 99, Morada, CA <br /> Dear Mr Wong <br /> This letter report presents the results of the first quarter 2001 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> SITE ACTTVTI'IES <br /> Activities at the site included monitoring groundwater levels in site monitoring wells, purging and <br /> sampling groundwater from site monitoring wells, and sampling several nearby domestic wells <br /> Samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, total xylenes (BTEX), oxygenated gasoline additives, 1,2-dichloroethane (1,2-DCA), <br /> and ethylene dibromide (EDB) In addition, a sample collected from well MW9(B) was also analyzed <br /> for nitrates and nitrites <br /> FIELD WORK <br /> Groundwater Monitoring and Sampling <br /> An experienced Ground Zero technician monitored water levels and sampled site monitoring wells <br /> MW1 through MW9(B) between February 2 and February 5, 2001 Groundwater elevations were <br /> calculated by measuring the depth to groundwater in each well and subtracting the measured depth <br /> from the respective well head elevation Groundwater elevations in shallow monitoring wells rose an <br /> average of 0 65 feet between October 2000 and February 2001 The groundwater elevation in well <br /> ! MW9(B), which was completed in a deeper aquifer, rose 129 feet during the same period <br /> Groundwater flow m the shallow aquifer was generally east-northeast, although an apparent <br /> G1Data1GROUNDZEITULF-BURG1Reports\QMR11QM2001 doc <br />