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' GW&SW Monitoring Report COE-WDR Project No. 894.2 ' September 1,2011 Coliform is ubiquitous in the environment and has been detected intermittently in ' various monitoring wells at the site. Historically, the water chemistry in the Stanislaus River does not change appreciably between sampling stations R-1 and R-2. However, for the 3rd quarter groundwater ' monitoring event sampling point R-1 contained elevated levels of total coliform (2,320 MPN/100mL). It is believed that this is a localized phenomenon. Sampling point R-2 was elevated but it is believed that the higher total coliform values are a ' result of upstream conditions. GTI has made recommendations to: ' Continue the quarterly groundwater and surface water monitoring program according to the WDRs (order No. 5-00-1142 and the corresponding Monitoring and Reporting Program No. 5-00-142). ' 2.0 INTRODUCTION The site is located on the north side of the Stanislaus River, approximately 1.5 miles south- southwest of the City of Escalon. The City of Escalon operates a Waste Water Treatment ' Plant (WWTP) at the site, which receives domestic wastewater from the City of Escalon and industrial wastewater from food processors. Storm runoff is conveyed to the WWTP through the industrial pipeline. The domestic and industrial wastewaters are treated and disposed of ' in separate ponds. Initially there were three groundwater monitoring wells at the site. On April 17, 2000, the CRWQCB issued a letter requiring the installation of four additional ' groundwater monitoring wells at the site. Tentative waste discharge requirements (WDRs) were also issued, which set guidelines for monitoring of the wastewater ponds, the ' groundwater and the surface water. On May 2, 2000, Geological Technics Inc. (GTI) prepared a work plan to install four additional groundwater monitoring wells at the site. On May 23, 2000, GTI submitted an addendum to this work plan that addressed items requested by the RWQCB. Six monitoring wells were installed on July 10 & 11, 2000,by GTI and V&W Drilling of Isleton, CA. ' On October 17, 2001, GTI prepared a work plan for the installation of three up-gradient monitoring wells and the abandonment of one monitoring well. An addendum was prepared ' on December 10, 2001. The work proposed in the work plan and subsequent addendum was performed on February 14 & 15, 2002. A report of the well installation and well abandonment was submitted on April 8, 2002. GTI has been performing quarterly groundwater monitoring events with the existing wells since the 1" quarter of 2002, in accordance with the waste discharge requirements (order No. ' 5-00-1142 and the corresponding Monitoring and Reporting Program No. 5-00-142). Geological Technics Inc. 2 894 3rd QMR I Ldoc