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' GW&SW Monitoring Report COE-WDR Project No. 894.2 September 1,2011 t purged. The wells were purged of at least 3 well volumes of stagnant water. After the well ' had recharged, a sample was collected from the Waterra tubing. The sample container was then identified and labeled with a unique designation, inserted into foam holders and placed into an ice chest cooled to 4°C 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 while collecting ' samples and were changed with each sample collected. A chain of custody document, listing all samples collected, accompanied the samples from 1 field to laboratory, thereby providing a means to track their movement and ensure their integrity. ' During purging of the wells, various field parameters were measured. These included pH, EC, Temperature, Dissolved Oxygen (DO) and Oxidation-Reduction Potential (ORP). The field parameters are included in Table 3 and in the field data log sheets of Appendix C. ' Sampling for Bacteria Analysis is followed To prevent the reintroduction of bacteria into the wells, the following procedure ' anytime the monitoring wells are accessed: • Before opening the pressure caps of each well, they are sprayed with Clorox® and then ' rinsed with de-ionized water. • Prior to making depth to water measurements in each well, the water level probe and tape are disinfected with Clorox® and then rinsed with de-ionized water. ' Before closing the monitoring wells after sampling, each pressure cap was sprayed with Clorox® and rinsed with de-ionized water to prevent the reintroduction of bacteria into the ' monitoring wells. 3.3 Groundwater Sample Analyses ' One 100 mL poly bottle, one 250 mL poly bottle, one 1 Liter sterile bottle, and 3 VOA's from each monitoring well were submitted to Denele Laboratory Services in Turlock, California(ELAP# 1203) for the following analyses: ' • Five Day 20°C Biochemical Oxygen Demand (BODS) • Nitrate as Nitrogen ' • Total Dissolved Solids (TDS) • Fixed Dissolved Solids (FDS) • Volatile Dissolved Solids (VDS) ' • Volatile Organic Compounds by EPA method 8260b • Standard Minerals • Ba, Ca, Mg, Na, K, Cl, SO4, Total Alkalinity, and Total Hardness ' • Total Coliform Bacteria • Fecal Coliform Bacteria Geological Tecwcs/1u. 4 894 3rd QMR 1 l.doc 1