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1117 Lone Palm Avenue <br /> Suite.B.... <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> I Fax 209.579.2225 <br /> A S S O C I A T E S I N C <br /> n1 7t <br /> June 26, 2000 <br /> 17292.0002 <br /> Mr. Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Second Quarter 2000 Groundwater Monitoring Report, Stagg High School, 1621 <br /> Brookside Road, Stockton, California <br /> Dear Mr. Wong: <br /> ATC Associates Inc., on behalf of the Stockton Unified School District, has prepared this letter to <br /> serve as a Second Quarter 2000 Monitoring report for the subject site (Figure 1). <br /> INTRODUCTION <br /> ATC's activities during the Second Quarter of 2000 included monitoring water levels and <br /> collecting groundwater samples from on-site monitoring well MW 1, analyzing the collected <br /> groundwater samples for petroleum hydrocarbon constituents, and preparation of this quarterly <br /> report. The location of the well is shown on Figure 3. <br /> GROUNDWATER MONITORING <br /> Groundwater Monitoring and Sampling <br /> On June 5, 2000, ATC personnel conducted quarterly monitoring and sampling at the above <br /> referenced site. The well was monitored, purged, and sampled in accordance with ATC's Site <br /> Safety Plan and Quality Assurance/Quality Control Plan (QA/QC Plan) submitted to PHS/EHD <br /> on February 1, 1999_ <br /> The groundwater level in the monitoring well was measured at 10.80 feet below grade, indicating <br /> a drop in the water table of 1.98 feet since water depth was last measured in March 2000. The <br /> groundwater monitoring data are summarized in Table 1. <br /> �• Monitoring well MW 1 was purged a minimum of three well volumes and until the stabilization of <br /> electric conductivity, pH, and temperature was observed. Subsequent to purging, groundwater <br /> w:\17292.0002Vcpofu\2 qmr 2000.doc 1 <br />