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1260 Graphics Drive <br /> Modesto, California <br /> 95351 <br /> (YVI%TC 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O C I A T E S I N C <br /> r <br /> November 3, 1998 <br /> 62574 <br /> l <br /> E <br /> Mr. Jeff Wong i <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Site Status Report, Fourth Quarter 1998, Smith Canal Pump Plant, Fontana Street <br /> and Smith Canal, Stockton, California, Site Code 1102 <br /> Mr. Wong: <br /> This letter report summarizes groundwater monitoring activities at the above referenced site <br /> (Figure 1) during the fourth quarter of 1998. These activities included monitoring fluid levels in <br /> r all site wells and collecting groundwater samples from wells MW3 and MW6 for laboratory <br /> analysis. <br /> FIELD WORK <br /> On October 5, 1998, static fluid levels were measured in monitoring wells MW1 through MW6. <br /> The water table elevation decreased an average of 0.83 feet since July 28, 1998. Table 1 <br /> summarizes the water level data collected during the reporting period and provides previous data <br /> for comparison. <br /> A groundwater gradient map was created for the October 5, 1998 monitoring event (Figure 2) <br /> using groundwater elevation data from all the wells monitored. Figure 2 depicts a generally north <br /> groundwater flow direction at a magnitude of approximately 0.009 ft/ft or 48 ft/mile. There is a <br /> slight mounding effect near well MW4 and that may be due to the presence of trace amounts of <br /> floating free product. <br /> Floating petroleum product was observed in well MW4 on October 5, 1998. No free product <br /> was recovered from the well because the quantity was too small to be collected into a bailer. <br /> Table 2 summarizes the product thickness measurements and volume of product removed from <br /> previous monitoring events. All bailed product has been stored in a DOT approved double <br /> containment drum pending appropriate disposal. <br /> wA943691quartlyl4gnr1998.doc 1 <br />