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I+<S' <br /> Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> April 22, 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: First Quarter 1994 Monitoring and Sampling Report, Site Code 1102, Smith Canal <br /> Pump Plant, Fontana Street and Smith's Canal, Stockton, California <br /> Dear Ms. Turkatte: <br /> This letter report summarizes groundwater monitoring activities at the above referenced site (Figure <br /> 1) during the first quarter of 1994. These activities included monitoring fluid levels in all site wells <br /> and collecting groundwater samples for laboratory analysis. <br /> rsr <br /> FIELD WORK <br /> On February 3, 1994, static fluid levels were measured in monitoring wells MW1 through MW6. <br /> The water table had risen an average of 0.6 feet since the previous monitoring event in December <br /> 1993. Table 1 summarizes the water level data collected this quarter and provides previous data for <br /> comparison. <br /> A groundwater gradient map was created for the February 3, 1994 monitoring event using a kriging <br /> program (Figure 2). The figure depicts a northwesterly gradient which varies from approximately <br /> 0.009 to 0.015 or approximately 48 to 79 feet per mile, which is consistent with historical data. <br /> Floating petroleum product was observed in well MW4. Approximately 100 milliliters of free A/ / <br /> product was recovered. 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 February 3, 1994 from wells MWl, MW2, MW3, MW5 <br /> and MW6. No groundwater sample was collected from MW4 due to the presence of free product. <br /> Prior to sample collection, each sampled well was purged of a minimum of three well volumes of <br /> water. Purged water was contained in labeled 55 gallon drums (DOT H), and stored on-site. <br /> Groundwater samples were collected after physical parameters (pH, temperature, and conductivity) <br /> s were monitored and had stabilized. Dedicated disposable bailers with bottom-emptying devices were <br /> used to collect samples from the wells. Field purge logs are presented in Attachment 1. <br /> OW03651QRTERLYIIQMR1994.DRF �f �� <br />