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Diamond Pet Food&AltaGas Ripon Energy January 31,2017
<br /> Combined Annual and Fourth-Quarter 2016 Groundwater-Monitoring Report Page I of 6
<br /> INTRODUCTION
<br /> This report presents the combined annual summary report and the results of annual and fourth-
<br /> quarter 2016 groundwater monitoring performed by Lawrence &Associates (L&A) on October
<br /> 10 and October 11, 2016, for Diamond Pet Food Processors of Ripon California LLC (DP) and
<br /> AltaGas Ripon Energy, Inc. (Ripon Energy), 942 South Stockton Avenue, Ripon, California
<br /> (Figure 1). The work was performed in accordance with Waste Discharge Requirements
<br /> (WDR) Order No. R5-2012-0105 for the DP/Ripon Energy site, adopted by the California
<br /> Regional Water Quality Control Board, Central Valley Region(CVRWQCB) on October 4,
<br /> 2012.
<br /> Annual and fourth-quarter groundwater monitoring consisted of measuring the depth to
<br /> groundwater in monitoring wells OB-1, OB-2, OB-4, OB-5, OB-7, OB-8, OB-11, OB-17, OB-
<br /> 19, OB-21, OB-22, OB-24, OB-25, OB-26, and OB-28 (Figure 2) and collecting groundwater
<br /> samples from the monitoring wells, as well as production wells PW-6, PW-7 and PW-8.
<br /> Groundwater samples were field tested for temperature,pH, electrical conductivity(EC), and
<br /> turbidity and laboratory tested for pH, EC, total dissolved solids (TDS; Figure 3), nitrate as
<br /> nitrogen,boron, calcium, chloride, iron, magnesium, manganese, nitrogen, potassium, sodium,
<br /> sulfate, total alkalinity(including alkalinity series), and hardness.
<br /> Table 1 (following text)presents well descriptions including well names, casing diameter,
<br /> reference point elevation, total depth, screened intervals, and aquifer unit(s).
<br /> Table 2 (following text)presents annual and fourth-quarter groundwater field and laboratory
<br /> data and Ripon Energy source water laboratory data.
<br /> This report also includes (1) daily, weekly, monthly, and annual data collected by DP and Ripon
<br /> Energy personnel, including wastewater and dilution water flow monitoring, influent
<br /> monitoring, aeration stabilization basin(ASB) monitoring, effluent monitoring, and land
<br /> application area(LAA) monitoring; (2) an evaluation of the performance of the waste water
<br /> treatment facility(WWTF); (3) a description of progress in the implementation of the Salinity&
<br /> Nutrient Evaluation Plan; (4) a statistical analyses of groundwater quality; and a description of
<br /> the salinity sources control methods implemented in the calendar year.
<br /> Data from offsite monitoring, domestic, and municipal wells is included herein. The offsite
<br /> wells were sampled by Stantec for the City of Ripon or Environmental Cost Management
<br /> (ECM) for Nestl6s. Field and laboratory results provided by Stantec and ECM were used in the
<br /> preparation of this report and are presented in Attachment A. L&A, however, did not review
<br /> the Stantec or ECM sampling methods or data for accuracy.
<br /> COMPLIANCE RECORD
<br /> During 2016, DP and Ripon Energy were in compliance with all report submittals and operation
<br /> limitations set forth in WDR Order No. R5-2012-0105, with the following exceptions:
<br /> 1. Treated DP and Ripon Energy effluent exceeded the upper concentration limit of 8.5 pH
<br /> units for pH on January 13, March 9, April 6, June 8, July 6, August 12, September 14,
<br /> November 6, and December 21, 2016 (Table 4). The annual average pH for effluent
<br /> was 8.8 pH units.
<br /> 2. An effluent water sample from ASB-2 was not collected for the month of October
<br /> (Table 4).
<br /> 010107.08 Task 4 Lawrence&Associates
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