ARCHIVED REPORTS_COMBINED ANNUAL AND FOURTH QUARTER 2016 GROUNDWATER MONITORING REPORT

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Diamond Pet Food&AltaGas Ripon Energy January 31,2017 Combined Annual and Fourth-Quarter 2016 Groundwater-Monitoring Report Page 4 of 6 (Attachment D). Table 5 (following text)presents the results of the trend analyses at the 98% significance level. Trend analyses for TDS show more improvements (decreasing trends or no trend) in water quality all wells. The trend analyses also show that the wells with the most increasing trends for constituents continues to be in the vicinity of northeastern part of the site beneath or near the eucalyptus grove. SITE DESCRIPTIONS AND OPERATIONS DIAMOND PET FOOD PROCESSORS OF RIPON CALIFORNIA LLC. DP uses dry ingredients, oils, fats, and fresh meat to manufacture its products. Dry ingredients consist of cereal grains, dry animal proteins, and vitamin and mineral supplements. The dry ingredients are delivered in bulk or bagged form. The bagged ingredients are stored in a dry warehouse. The bulk ingredients are stored in bins and silos. Fats and oils are stored in liquid tanks within a contained tank farm. The fresh meat is shipped in reusable totes and stored in a cooler room. The dry ingredients first are mixed together in a three-ton mixer, and then transferred to a hammer mill for more extensive grinding to turn into a mash. The mash is then sent to the extrusion process where the fat/oil and fresh meat are added. The extrusion process uses time, temperature, heat and pressure to cook the product. The product is cooked to a minimum of 190°F. This process creates a very small amount of scrap which is reworked or sent to an appropriate disposal facility. The product is sent from extrusion to a dryer, where it is dried for about 30 minutes. The product then moves to a series of coaters that apply fat/oil and natural flavors. The product is screened twice before it is moved to packaging. The screeners clean the product, taking off very fine pieces and mis-formed kibbles. The fines and mis-formed kibble are reworked. The product is stored in overhead bins in the warehouse until it is packaged. The product is tested in packaging and at other steps throughout the process. If the product is not within specifications, it is rejected and reworked within the process. Wastewater from the Plant consists of Reverse Osmosis (RO)reject water and process/sanitation(cleaning) water. On a maximum day, about 75,000 gallons per day(gpd) is rejected from the RO system and about 12,000 gpd generated as process and cleaning water. This level of discharge is rare, however, occurring for one day at a time very occasionally. According to DP personnel, the maximum discharge reflects operation of all four production lines which rarely occurs. The existing wastewater facilities (Sump, Clarifier, ASB-1, ASB -2, and irrigation piping) are used to treat the wastewater through aeration and disperse it. Effluent from the Clarifier is discharged into the two aeration stabilization basins in sequence (ASB-1 then ASB-2). The first pond, ASB-1, is approximately 14-feet deep and is lined; the second, ASB-2, is unlined and approximately 5-feet deep. Effluent from ASB-2 is pumped to one of five land application areas (Area A through Area E) with a combined acreage of 75 acres of fields and orchards around the site. Other ponds on the site (labeled Ponds 1 through 4) are unlined and are used only to contain excess wastewater in case of a system upset or a 100-year-or-greater storm event. ALTAGAS RIPON ENERGY The Ripon Energy plant routes blowdown through the DP facilities wastewater system. Historic flows (2009 and 2010) were between 200,000 and 300,000 gallons per day. In the fourth- quarter 2012, average flows ranged between 55,788 and 137,444 gallons per day. The most 010107.08 Task 4 Lawrence&Associates W.9CLIENTSIDiamond Pet Foods1010107.01-Groundwater MonitoringlGroundwater Monitoring1201614QAnnua1201614TH QUARTER Annual 2016.doc