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\� Monitoring Well Installation Work Plan City of Stockton RWCF April 27,2005 Page 4 will be purged using a clean, disposable bailer until the temperature, EC, and pH of the water have stabilized. A minimum of three casing volumes' of water will be purged from each well. Field parameters [temperature, EC,pH, dissolved oxygen(DO),oxidation/reduction potential(ORP),total dissolved solids (TDS), and turbidity readings] will be recorded after each well volume is purged. Each monitoring well will be allowed to recover to at least 80%of the pre-purge water level before sampling. Purged water will be discharged to the ground in the vicinity of the wells. Groundwater samples will be collected with clean, disposable bailers and transferred to laboratory supplied containers. Any required sample filtering and/or preservation will be conducted at the selected state-certified laboratory. The type of containers for each analyte is listed in Table 1, below. Each container will be labeled for sample identification and placed in a cooler chilled with ice. Upon completion of the fieldwork, the water samples will be delivered under chain-of-custody procedures to a state-certified laboratory for analyses. 5.0 LABORATORY ANALYSES Groundwater samples will be tested for the constituents listed in MRP No. R5-2002-0083 for the RWCF (listed in Table 1, below). The samples will be analyzed using U.S. EPA Methods and California- approved methods under the quality assurance/quality control measures specified for those methods. Table i —Quarterly Groundwater Monitoring Parameters Analyte EPA units Volume/Preservative** Reporting Holding Method* /Container Limit Time Ammonia as Nitrogen SM4500-HB mg/L 500 mL/H2SO4/Plastic 0.2 mg/L 28 days Nitrate as Nitrogen 300.0 mg/L 500 mL/H2SO,i/Plastic 0.25 mg/L 28 days Total Dissolved Solids(TDS) SM2500C mg/L 500 mL;Plastic 10 mg/L 7 days Total Coliform SM9221B MPN/ 100 120 mL/Na2S204- 2 MPN/ 6 hours ml Sterile/Bacti Bottle 100 ml pH SM4500-HB Std.Units 500 mL/Plastic or Glass 1.0 Std. Analyze Units Immediately Specific Conductance(EC) SM2510B pmhos/cm 500 mL;Plastic 10 I µm os/cm 28 days *=EPA Equivalent Analytical Methods may be utilized **=All samples must be cooled to approximately 4"Celsius Units: mg/L=milligrams per liter=parts per million(ppm) µmhos/cm=micromhos per centimeter mL=milliliters *C=degrees Centigrade 6.0 REPORTING Condor will prepare a report detailing the monitoring well installation, surveying, development, and sampling activities to be submitted to the City of Stockton. The report will include a discussion of the field and laboratory procedures used to conduct the investigation, geologic logs of the borings, a discussion and presentation of the analytical results, and recommendations. 'Wells will not be purged if there is insufficient water column available.