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1117 Lone Palm, Suite B <br /> Modesto, California 95351 <br /> www.atc-enviro.com <br /> ���V [ED 209.579.2221 <br /> A S S O C I A T E S I N C <br /> Fax 209.579.2225 <br /> HEALTH <br /> October 9, 2001 :,WERVICES <br /> 17292.0002 / <br /> FY� <br /> Mr. Jeff�Wong <br /> San Joaquin County Public Health Services S �' <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Third Quarter 2001 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 /> 40 serve as a Third Quarter 2001 Monitoring report for the subject site(Figures 1 and 2). <br /> INTRODUCTION <br /> ATC's activities during the Third Quarter of 2001 included monitoring water levels and collecting <br /> groundwater samples from on-site monitoring wells MW1, MW2, MW3, MW4, and MW5, <br /> analyzing the collected groundwater samples for petroleum hydrocarbon constituents, and <br /> preparation of this quarterly report. The location of the wells are shown on Figure 2. <br /> GROUNDWATER MONITORING <br /> Groundwater Monitoring and Sam lin <br /> On September 17, 2001, ATC personnel conducted quarterly monitoring and sampling at the <br /> above referenced site. The wells were monitored, purged, and sampled in accordance with ATC's <br /> Workplan Addendum for Supplemental Subsurface Investigation at Stagg High School, 1621 <br /> Brookside Road, Stockton California, dated December 7, 2000 and ATC's Site Safety Plan <br /> submitted to PHS/EHD on July 1, 1999. <br /> Water level measurements were collected from wells Mw 1, MW2, MW3, MW4, and MW5 on <br /> September 17, 2001. The groundwater levels ranged in elevation from a high of—6.03 feet at <br /> MW4 to a low of --6.26 at MW5. The site's underlying groundwater direction of flow was <br /> �} observed to be to the north-northeast. Regional groundwater flow is estimated to be in an <br /> w:Iwordpro117292.00021repofu`3 qmr 2001.d— <br /> 1 � <br />