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1117 Lone Palm Avenue Suite B <br /> vMcsto cavornia 95351 <br /> r _Wwwatc-enviro com <br /> _ 209 579 2221 <br /> c� <br /> Fax 209 579 2225 <br />�h A S S O C I A T E S I N C <br /> CD <br /> July 27, 2000 <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 First Quarter 2000 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 First Quarter of 2000 <br /> The site location is shown on Figure 1 <br /> GROUNDWATER MONITORING AND SAMPLING <br /> ATC personnel performed groundwater monitoring and sampling on March 29, 2000 Field <br /> work consisted of measuring the depth-to-water in on-site wells MW-1 through MW-3 in <br /> addition to purging and sampling the wells <br /> Static groundwater elevations were measured in each monitoring well on March 29, 2000 <br /> Groundwater was measured at an average of approximately 6 19 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 northeasterly groundwater gradient averaging 0 03 ft/ft or approximately 158 feet/mile <br /> Groundwater monitoring data are summarized in Table 1 <br /> On March 29, 2000 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 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 ten casing volumes of water was removed from wells MW-1 and MW-2 Only one <br /> casing volume was purged from MW-1 due to slow recovery and an apparent obstruction was <br /> observed in the well at approximately 7 5 feet below the top of the well casing A dedicated <br />