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V 1117 Lone Palm Avenue Suite B <br /> Modesto California 95351 <br /> WWwatc-enviro com <br /> I 209 579 2221 <br /> Fax 209 579 2225 <br /> .C)l gtiC 2? 1143 <br /> August 21, 2001 <br /> 54 92054 0002 <br /> Mr Michael J Infurna Jr <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , Fourth Floor <br /> Stockton, CA 95201-0388 <br /> Subject Third Quarter 2001 Groundwater Monitoring for Gemelos Property, 2421 Holly <br /> Drive, Tracy, CA, Site Code 1412 <br /> Dear Mr Infurna <br /> This letter report summarizes fieldwork completed by ATC Associates Inc (ATC) on behalf of <br /> • Mr John Gemelos at 2421 Holly Drive, Tracy, California during the Third Quarter of 2001 <br /> The site location is shown on Figure 1 <br /> GROUNDWATER MONITORING AND SAMPLING <br /> ATC personnel performed groundwater monitoring and sampling on July 13, 2001 Field work <br /> consisted of measuring the depth-to-water in on-site wells MW-1 through MW-3 in addition to <br /> purging and sampling the wells <br /> Static groundwater elevations were measured in each monitoring well on July 13, 2001 <br /> Groundwater was measured at an average of approximately 7 18 feet below ground surface (bgs) <br /> A groundwater gradient map was created with the data The gradient map, presented as Figure 3, <br /> depicts a north-northwesterly groundwater gradient averaging 0 003 ft/ft or approximately 15 8 <br /> feet/mile Groundwater monitoring data are summarized in Table 1 <br /> On July 13, 2001 groundwater samples were collected by ATC from monitoring wells MW-1, <br /> MW-2, and MW-3 Groundwater samples were collected from the monitoring wells after <br /> stabilization of pH, electrical conductivity (EC), and temperature All wells monitored were <br /> purged and sampled according to ATC's Quality Assurance/Quality Control Plan on file with the <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) A <br /> minimum of three casing volumes of water each was removed from wells MW-1, MW-2, and <br /> MW-3 A dedicated disposable bailer was used to collect each water sample Field parameters <br /> and purged volumes are shown on well purge logs included in Attachment 1 <br /> w lwordpro192054192054 0217-2001 qm doc <br />