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vr�y 1117 Lone Palm Avenue, Suite B <br /> • Modesto, CA 95351 <br /> www atc-enviro com <br /> s r,4 <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S 1 N C <br /> April 28, 2003 U-W <br /> 17292 0001 CE&ED <br /> MAY ° 1 2003 <br /> Mr Jeff Wong ENWF,' <br /> San Joaquin County QNMENT NEA <br /> Environmental Health Department PERPv11T/SERVICESTN <br /> 304 E Weber Street, Third FIoor <br /> Stockton, California 95202 <br /> Subject Fourth Quarter 2002 Groundwater Monitoring Report, Franklin High School, 300 <br /> North Gertrude Avenue, Stockton, California <br /> Dear Mr Wong <br /> ATC Associates Inc , on behalf of the Stockton Unified School District, has prepared this letter <br /> to serve as a Fourth Quarter 2002 Monitoring report for the subject site (Figure 1) <br /> INTRODUCTION <br /> • ATC's activities during the Fourth Quarter of 2002 included monitoring the water level and <br /> collecting a groundwater sample from on-site monitoring well MW-1, analyzing the collected <br /> groundwater sample for petroleum hydrocarbon constituents, and preparation of this quarterly <br /> report <br /> GROUNDWATER MONITORING <br /> Groundwater Monitoring and Sampling <br /> On December 12, 2002 ATC personnel conducted quarterly monitoring and sampling at the <br /> above referenced site The well was monitored, purged, and sampled in accordance with ATC's <br /> Site Safety Plan and Quality Assurance/Quality Control Plan submitted to San Joaquin County <br /> Public Health Services/Environmental Health Department (PHS/EHD) on February 1, 1999 <br /> i <br /> The depth to groundwater in the monitoring well was 62 78 feet below grade, indicating a <br /> decrease in the water table of 2 80 feet since water depth was last measured in May 2002 The <br /> groundwater monitoring data are summarized in Table 1 <br /> Monitoring well MW1 was purged a minimum of three well volumes and until the stabilization <br /> of electric conductivity, pH, and temperature was observed Subsequent to purging, groundwater <br /> was sampled and transferred to appropriate sample containers, using a clean, disposable bailer <br /> with a bottom-emptying device to reduce volatilization Sample containers were then labeled <br /> m <br /> W 117292 00011reportsl4 qmr 2002 doe I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />