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1117 Lone Palm Ave., Suite B V Modesto, California 95351 www.atc-enviro.com 209.579.2221 (: kT C Fax 209.579.2225 A S S O C I A T E S I N C October 9, 2002 54.62574.0002 Mr. Jeff Wong San Joaquin County Environmental Health Department 304 E. Weber Avenue, 3rd Floor Stockton, CA 95202 Subject: Site Status Report, Third Quarter 2002, Smiths Canal Pump Plant, 2144 Fontana Street, Stockton, California, Site Code 1102 Mr. Wong: This letter report summarizes groundwater monitoring activities at the above referenced site . --. (Figure 1) during the third quarter of 2002. These activities included monitoring fluid levels in all f F;rr site wells and collecting groundwater samples from wells MW1, MW2, MW3, MW4, MWS, MW6, and MW7 for laboratory analysis. FIELD WORK On October 1, 2002, static fluid levels were measured in monitoring wells MWI through MW7, The water table elevation decreased an average of 0.61 feet since May 2002. Table 1 summarizes the water level data collected during the reporting period and provides previous data for comparison. A groundwater gradient map was created for the October 1, 2002 monitoring event (Figure 2) using groundwater elevation data from all the wells monitored. Figure 2 depicts a generally north groundwater flow direction at a magnitude of approximately 0.006 ft/ft or 32 ft/mile. Floating petroleum product has previously been observed in well MW4. On October 1, 2002, only a slight, unmeasurable sheen was observed in well MW4. No free product was recovered from the well because the quantity was too small to be collected into a bailer. Table 2 summarizes the product thickness measurements and volume of product removed from previous monitoring events. Groundwater samples were collected on October 1, 2002 from all wells, MWl through MW7. Prior to sample collection, each sampled well was purged of a minimum of three well casing w:162574.021quar110gmr2002.doc 1 ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS