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Diamond Pet Food Processors of Ripon California,LLC January 31,2013
<br /> Sampling and Analysis Plan Page 3 of 5
<br /> 3. GROUNDWATER MONITORING PROGRAM
<br /> CCR Title 27, Subtitle D, Article 1, §20385 requires that dischargers of wastes to waste
<br /> management units institute the following, as appropriate.
<br /> The groundwater monitoring program shall consist of the following:
<br /> The water level in each monitoring well shall be measured quarterly consistent with Title 27,
<br /> §20415(e) (15). Groundwater contour maps, showing the direction and magnitude of the
<br /> groundwater gradient in the uppermost aquifer beneath the site, will be prepared based on the
<br /> data.
<br /> Quarterly monitoring wells OB-1, 013-2, OB-4, OB-5, OB-7, OB-8, OB-11, OB-17, OB-19, OB-
<br /> 21, OB-22, 013-24, OB-25, 013-26, and OB-28 will be analyzed for depth to groundwater, EC,
<br /> TDS, and nitrate as nitrogen.
<br /> Annually, monitoring wells 013-1, 013-2, OB-4, OB-5, OB-7, OB-8, OB-11, OB-17, 013-19, OB-
<br /> 21, OB-22, OB-24, OB-25, OB-26, and OB-28 and production wells PW-6 through PW-8 will be
<br /> analyzed for depth to groundwater, EC, TDS, and nitrate as nitrogen,boron, calcium, chloride,
<br /> iron, magnesium,manganese, nitrogen,potassium, sodium, sulfate, total alkalinity(including
<br /> alkalinity series), and hardness.
<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-6 through PW-8, which have dedicated submersible pumps)will be
<br /> purged with an Enviro-Tech ES-60 1.875-inch PVC pump set up to 20 feet below the surface of
<br /> the groundwater. Prior to sampling, each well will be purged of three casing volumes of water or
<br /> until field parameters stabilize. Purged water from all other wells will be disposed by direct
<br /> discharge to the ground 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 /> 010107.03 Lawrence&Associates
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