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t GW &SW Monitoring Report COE-WDR Project No. 894.2 ' September 1,2011 • Volatile Organic Compounds (VOCs) were reported to be non-detect in all ' monitoring wells during the 3rd quarter 2011 groundwater monitoring event. • Total Coliform Bacteria— was reported to be below laboratory reporting limits for all monitoring wells during the 3rd quarter 2011 groundwater monitoring event with the exception of MW-3 (542 MPN/100mL). Total Coliform has decreased or remained the same from the previous monitoring event in all other wells and is within historical ' • ranges. Fecal Coliform Bacteria was reported to be below laboratory reporting limits for all monitoring wells during the 3rd quarter 2011 groundwater monitoring event. Coliform is ubiquitous in the environment and has been detected intermittently in ' various monitoring wells at the site. ' 4.0 SURFACE WATER MONITORING On August 2, 2011, GTI personnel performed the surface water sampling at the two sampling stations along the north bank of the Stanislaus River. R-1 is approximately 100 feet upstream of the railroad trestle and R-2 is located approximately 100 feet downstream of the ' westernmost boundary, as shown in Figure 2. 4.1 Surface Water Sampling Procedure The samples were collected with a long-handled dipper. The sample containers were identified and labeled with a unique designation and placed in a chilled ice chest for transport to the laboratory. ' All non-disposable sampling equipment was decontaminated using an Alconox® solution before and between uses. Disposable gloves were used by the geologist to collect all samples ' and were changed between each sample. A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track the movement of the samples and ensure their integrity. ' Field measurements were made at the time of sample collection for Temperature, pH, Specific Conductance (EC) and Dissolved Oxygen (DO). The field parameters are included in the field data log sheets of Appendix C. ' 4.2 Surface Water Sample Analysis The two surface water samples were submitted to Denele Laboratory Services in Turlock, California (FLAP# 1203) for the following analyses: • Five Day 20°C Biochemical Oxygen Demand (BODS) t • Nitrate as Nitrogen • Total Dissolved Solids (TDS) • Fixed Dissolved Solids (FDS) ' Geological Technics Inc. 6 894 3rd QMR I Ldoc