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i <br /> /t�A <br /> F' Working to Restore Nature <br /> I <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone:(209) 838-3507 �i4 May 5, 1992 <br /> FAX: (209)838-3509 <br /> MAY 0 6 1992 j <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services ENMONMENML y <br /> P. O. Box 2009 PERMIT/SERVICES�H <br /> Stockton, CA 95201 <br /> RE: Quarterly Monitoring Report, Site Code 1102, Smiths Canal Pump Plant, Fontana <br /> Street and Smiths Canal, Stockton, California <br /> Dear Ms. Turkatte: <br /> I <br /> This letter report summarizes groundwater monitoring activities at the above referenced site j <br /> (Figure 1) during the first quarter of 1992. These activities included monitoring groundwater <br /> levels and the sampling of site wells for dissolved hydrocarbons and coliform bacteria. <br /> Other activities performed at the subject site during the first quarter of 1992 included the <br /> - excavation of a 5,000 gallon underground diesel storage tank. Analyses of soil samples collected <br /> in this event, along with a report summary, were submitted under separate cover in RESNA's <br /> "Soil Sampling Report" dated March 24, 1992. <br /> Groundwater Monitoring and Sam lin <br /> On March 18, 1992, fluid levels were measured in monitoring wells MW1, MW2, MW3, and <br /> MW4. Static groundwater elevations were measured prior to purging and sampling any well on <br /> site. Groundwater flows northwest with a gradient of approximately 0.058 ft/ft, or 306 ft/mile <br /> (Figure 2). Groundwater monitoring data are summarized in Table 1. <br /> Groundwater samples were collected from wells MW1, MW2, MW3, and the on-site irrigation <br /> well. Prior to sample collection, wells MWl and MW2 were each purged of approximately 50 <br /> gallons of water to collect representative groundwater samples. Monitoring well MW3 was <br /> purged of 9.5 gallons of water due to slow recharge. Purged water was contained in 55 gallon <br /> drums (DOT H), labelled, and stored on site. Floating hydrocarbon product was noted in Well <br /> MW4 and measured to be approximately 1.4 feet in thickness. No groundwater sample was <br /> collected from MW4 due to the presence of floating product. Groundwater samples were <br /> collected after physical parameters (pH, temperature, and conductivity) were monitored and had <br /> stabilized. Samples were collected using a disposable bailer with a bottom-emptying device. <br /> Field purge logs are presented in Attachment 1. <br /> SCLR0592ML <br /> I <br />