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L ' • •f ise t:. SWFN ENVIRONMENTAL TECHNOLOGIESCORPORATiON September 16, 1997 94369 Mr. Steve Sasson San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Avenue, 3rd Floor Stockton, CA 95202 Subject: Site Status Report, Third Quarter 1997, Smith Canal Pump Plant, Fontana Street and Smith Canal, Stockton, California, Site Code 1102 Mr. Sasson: This letter report summarizes groundwater monitoring activities at the above referenced site (Figure 1) during the third quarter of 1997. These activities included monitoring fluid levels in all site wells and collecting groundwater samples from wells MW2, MW3, and MW6 for laboratory ,.. analysis. FIELD WORK On July 2, 1997, static fluid levels were measured in monitoring wells MW1 through MW6. The water table elevation decreased an average of 0.31 feet since April 18, 1997. 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 2, 1997 monitoring event (Figure 2) using groundwater elevation data from all the wells monitored. Figure 2 depicts a general north- northwest groundwater flow direction. Floating petroleum product was observed in well MW4 on July 2, 1997. Approximately 0.100 liters of free product were recovered from the well. 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 containment drum pending appropriate disposal. Groundwater samples were collected on July 2, 1997 from wells MW2, MW3, and MW6. No groundwater sample was collected from MW4 due to the presence of free product. Prior to w:1943691quarllyl3gmrl997.doe 1 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 Engineering Consulting Remediation • Construction