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Diamond Pet Food Processors of Ripon California,LLC January 28,2011 <br /> Sampling and Analysis Plan Page 7 of 9 <br /> 5. MONITORING EQUIPMENT <br /> The following discusses the monitoring equipment to be used for monitoring groundwater. <br /> 5.1 WELL PURGING AND SAMPLING <br /> All wells (except wells PW-4 through PW-8, which have dedicated submersible pumps) will be <br /> purged using either a submersible Grundfos MPI 2-inch pump or an Enviro-Tech ES-60 1.875- <br /> inch PVC pump set up to 20 feet below the surface of the groundwater. Prior to sampling, each <br /> well will be purged of three casing volumes of water or until field parameters stabilize. Purged <br /> water from wells TH-7 through TH-10 and wells M-7-A, M-11-A, M-11-C, and M-19-C will be <br /> transported to Nestles' Stockton Avenue groundwater-treatment system in Ripon for disposal <br /> because trichloroethylene (TCE) or various TCE daughter products have been detected in these <br /> wells. Purged water from all other wells will be disposed by direct discharge to the ground <br /> surface and allowed to infiltrate/evaporate. <br /> 5.2 WATER LEVEL INDICATOR <br /> A Waterline Water Level Meter, Model 75 or equivalent,will be used to collect depth to <br /> groundwater. The Model 75 Water Level Meter uses a 3/8-inch stainless steel segmented probe <br /> attached to a permanently marked polyethylene tape, fitted on a well-balanced reel. It is powered <br /> by a standard 9-volt battery housed in an easy-access battery drawer. The conductors embedded <br /> within the tape each have seven strands of stainless steel for strength and flexibility. <br /> The probe incorporates an insulating gap between electrodes. When contact is made with water, <br /> the circuit is completed, activating a loud buzzer and a light. The water level is then determined <br /> by taking a reading directly from the tape at the top of the well casing or borehole. <br /> 5.3 FIELD PARAMETER METERS <br /> To assure a representative sample is collected, field parameters are measured as groundwater is <br /> purged from each well. A sample of groundwater will be collected once the measurements of <br /> field parameters have stabilized to a relatively constant level (+/- 10%). The parameters that are <br /> required by the MRP and Title 27, California Code of Regulations, Section 20415(e)(13) include <br /> temperature, turbidity,pH, and electrical conductivity. <br /> To comply with the field parameter monitoring requirements, an Oakton 10 pH/EC/temperature <br /> Water Quality Checker or equivalent will be used to monitor pH, conductivity, and temperature, <br /> by immersing the probes' analysis device directly in water, and a LaMotte 2020 turbidimeter or <br /> equivalent will be used to monitor turbidity levels by filling a water cell and inserting the cell into <br /> the instrument. <br /> 6. SAMPLING PERSONNEL <br /> All sampling will be conducted under the direct supervision of a California Professional <br /> Geologist or Engineer under contract to the Owner. Sampling personnel will include geologists, <br /> engineers, or technicians with at least six months of training and experience in the use and <br /> calibration of monitoring instrumentation. Training will include instruction and practice of <br /> operation of monitoring equipment overseen by experienced personnel in accordance with the <br /> manufacturer's manuals and other guidance documents. <br /> 010107.01 Lawrence&Associates <br /> FN:ICLIENTSOiamond Pet Foods1010107.01-G,'oundu�ater AlonitoringlGroa,tdu,ale,-Alonilo,-ing120J01Sa,npling a,td Analvsis Plan.docx <br />