ARCHIVED REPORTS_SITE CONCEPTUAL MODEL 2009

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amec�9 industrial wastewater (approximately 10 gpm) from Nulaid Foods, Inc, at 337 4th Street (personal communication with Ted Johnston, Director of Public Works, City of Ripon), and 3) a portion of treated groundwater from a groundwater extraction and treatment system operated by Nestle at 519 Stockton Avenue may be discharged to the industrial sewer on occasion when it is not used to meet local non-potable water demands. Untreated industrial sewer inflow is directly infiltrated to the water table through rapid infiltration at two disposal ponds adjacent to the treated domestic wastewater storage ponds 1 and 2 (Figure 13), and south of the industrial ponds along a meander of the Stanislaus River. Average inflow rates for the industrial sewer recently have been approximately 80,000 gallons per day. Industrial sewer disposal rates are likely relatively consistent over the course of the year because much of the flow is from the groundwater treatment systems which are operated at relatively consistent pumping rates. Because of its very close proximity to the Stanislaus River, much of the industrial wastewater that is infiltrated probably discharges to the Stanislaus River. The presence of the Stanislaus River may provide some attenuation of the formation of a hydraulic mound in this area. It is possible that a portion of this recharged water does not discharge to the river, but migrates downwards and eventually beneath the river in a southerly direction into Stanislaus County. Since approximately 2002, the City of Ripon has been purchasing water from the South San Joaquin Irrigation District (SSJID) and recharging groundwater in an unlined pit approximately 20 feet deep (personal communication with Ted Johnston, Director of Public Works, June 11, 2008). The pit is located in an area bounded by the City of Ripon Corporation Yard on the south, Doak Boulevard on the north, and Vera and Acacia Avenues on the west and east (Figure 13). The City purchases approximately 500 acre-feet/year of irrigation water with low total dissolved solids (TDS)from the SSJID for recharging groundwater between March and October. The recharge of water in these ponds during the summer months may explain the westerly extension of the hydraulic mound shown in potentiometric surface maps for the July 2008 Upper and Intermediate Aquifer (Appendix F), indicating that flow directions are likely highly variable in both aquifer zones due to the influence of the focused seasonal recharge. Neenah Paper, Inc. Industrial Wastewater Disposal Neenah Paper, Inc., (NP) manufactures paper from purchased pulps, and uses water to make the dry pulp into slurry. Industrial wastewater from the plant and regeneration brine from the neighboring cogeneration plant (owned by Countryside Power Income Fund) are collected and discharged to a primary clarifier, which is discharged to a lined pond (ASB-1), and then a second pond (ASB-2) which is unlined (Lawrence and Associates, 2005; the composition of liner material was not stated). The approximate locations of the ponds are shown in Figure 13. AMEC Geomatrix, Inc. I:\Doc_Safe\9000s\9837.005\4000 REGULATORY\SCM_01.30.09\1_text\SCM Report Final.doc 31