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I It <br /> ma <br /> 1_..I - <br /> h,� <br /> Working To Restore Nature <br /> 1710 Main Street 1± ` 53 <br /> fir <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> January 4, 1994 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Quarterly Monitoring Report, October 1993 through December 1993, Site Code <br /> 1102, Smith Canal Pump Plant, Fontana Street and Smith's Canal, Stockton, <br /> California <br /> Dear Ms. Turkatte: <br /> This letter report summarizes groundwater monitoring activities at the above referenced site (Figure <br /> 1) during the fourth quarter of 1993. These activities included monitoring fluid levels in all site <br /> wells and collecting groundwater samples for laboratory analysis. <br /> FIELD WORK <br /> On December 1, 1993, static fluid levels were measured in monitoring wells MW1 through MW6. <br /> The water table had decreased an average of 0.63 feet since the previous monitoring event in August <br /> 1993. Table 1 summarizes the water level data collected this quarter and provides previous data for <br /> comparison. <br /> Water level measurements collected during this quarter indicate groundwater flows northwest, which <br /> is consistent with historical data. A groundwater gradient map was created using data collected from <br /> the December 1, 1993 monitoring event (Figure 2). The figure, created using a kriging program, <br /> depicts a northwesterly gradient of approximately 1.3 per cent, 69 feet per mile. <br /> Floating petroleum product was observed in well MW4. Approximately 800 milliliters of free <br /> product was recovered. Since May 29, 1992, approximately 5.87 liters of free product have been <br /> removed from MW4. Table 2 summarizes the product thickness measurements and volume of <br /> product removed. All bailed product has been stored in a DOT approved double containment drum <br /> pending appropriate disposal. <br /> Groundwater samples were collected on December 1, 1993 from wells MW2, MW3, MW5 and ` <br /> MW6. No groundwater sample was collected from MW4 due to the presence of free product. San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has granted <br /> semi-annual groundwater sampling for MW1, therefore, no sample was taken from this well. The <br /> next groundwater sampling for MW1 is tentatively scheduled for March 1994. Prior to sample <br /> OW03651QRTERLYI4QMR1993.FNL / C <br />