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I MI <br /> Working to Restore Nature <br /> 1710 Main Street <br /> Escalon,CA 95320 � <br /> Phone:\1209)838-3507 IITTS�iiEE�� }� <br /> FAX:(209)838-3509 �L�vt�� May 5, 1992 <br /> ��77lifl <br /> Ms. Linda Turkatte MAY Q 6 199 V <br /> San Joaquin County Public Health Services ERpN <br /> EAUN <br /> P. O. Box 2009 p RM fflS N <br /> Stockton, CA 95201 <br /> RIB: Quarterly Monitoring Report,Site Code 1102,Smiths Canal Pump Plant,Fontana <br /> Street and Smiths Canal, Stockton, California <br /> Dear Ms. Turkatte: <br /> } <br /> This letter report summarizes groundwater monitoring activities at the above referenced site <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 MNA's <br /> Soil Sampling Report" dated March 24, 1992. <br /> Groue�dwater 1Vl Vb_n: l; n Aml}�ing <br /> a <br /> u <br /> On March 18, 1992, fluid levels were measured in monitoring wells MWi, 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 i <br /> (Figure 2). Groundwater monitoring data are summarized in Table 1. , <br /> 4 Groundwater samples were collected from wells MW1, MW2, MW3, and the on-site irrigation <br /> well. Prior to sample collection, 'veils 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 /> 3 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 /> SUR0592ML <br />