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1260 Graphics Drive V Modesto, California 95351 209.579.2221 Fax 209.579.2225 i 1 f -ATC r f A S S O C I A T E S I N C . kJ� - i September 21, 1998 62574 raj Mr. Jeff Wong San Joaquin County Public Health Services Environmental Health Division t r 304 E. Weber Avenue, 3rd Floor Stockton, CA 95202 Subject: Site Status Report, Third Quarter 1998, Smith Canal Pump Plant, Fontana Street and Smith Canal, 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 1998. These activities included monitoring fluid levels in all site wells and collecting groundwater samples from well MW2, MW3, and MW6 for laboratory analysis. �y j FIELD WORK On July 28, 1998, static fluid levels were measured in monitoring wells MWl through MW6. The water table elevation decreased an average of 1.45 feet since April 3, 1998. 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 July 28 and September 18, 1998 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 0.007 ft/ft or 37 ft/mile. There is a slight mounding effect near well MW4 and that may be due to the presence of trace amounts of floating free product. Floating petroleum product was observed in well MW4 on July 28, 1998. 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. All bailed product has been stored in a DOT approved double f. containment drum pending appropriate disposal. s w:W43691quaAIy\3grw1998Aoc 1 E!