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CVY 1117 Lone Palm Avenue Suite B ATC I Modesto, CA 95351 209.579.2221 ' Fax 209.579.2225 A S S O C I A T E S I N C , February 1, 1999 62574 Mr. Jeff Wong San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Avenue, 3rd Floor Stockton, CA 95202 Subject: Site Status Report, First Quarter 1999, Smiths Canal Pump Plant, Fontana Street and Smiths Canal, Stockton, California, Site Code 1102 Mr. Wong: This letter report summarizes groundwater monitoring activities at the above referenced site (Figure 1) during the First quarter of 1999. These activities included monitoring fluid levels in all f5 site wells and collecting groundwater samples from wells MWl, MW2, MM3, MW5, and MW6 for laboratory analysis. FIELD WORK On January 14, 1999, static fluid levels were measured in monitoring wells MWl through MW6. The water table elevation increased an average of 0.18 feet since October 5, 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 January 14, 1999 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. 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 January 14, 1999. 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 recovered product has been stored in a DOT approved double containment drum pending appropriate disposal. w:1943691quarlly\I ynr 1999.doc 1 Mfr