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WASTE DISCHARGE REQUIREMENTS ORDER NO. -5- <br /> PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS <br /> WASTEWATER TREATMENT AND DISPOSAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> 29. Three shallow groundwater monitoring wells were installed at the application site in July 1988. <br /> The locations of Wells MW-2 and MW-3 are shown in Attachment B. The portion of the previous <br /> application area that contained Well MW-1 was developed as a warehouse facility. Groundwater <br /> levels have been monitored by the Discharger since June 1994. However, much of the elevation <br /> data is poor quality and may not be reliable. The depth to groundwater is approximately 10 to 15 <br /> feet below ground surface (bgs). The direction of shallow groundwater movement appears to be <br /> generally to the west. <br /> 30. The City of Lathrop operates three drinking water supply wells which are located between Lathrop <br /> Road, Louise Avenue, McKinley Avenue, and the Western Pacific rail line. The closest of the <br /> municipal wells is approximately 2,000 feet east of the application area. <br /> 31. The average analytical results for groundwater Samples collected since 1994 from Wells MWl,MW2, <br /> and MW3 are presented below. Also presented is the average concentration of analytes in samples <br /> collected from monitoring wells located at the processing facility(Wells A,B,and C)where land <br /> application has not occurred. Regular quarterly sampling was not initiated until May 1998;prior to that <br /> time samples were collected infrequently dating back to 1988. The data averaged below consists of <br /> between four to nine sample events. The facility data is averaged from one sampling event performed <br /> on 24 July 2000. A summary of the average analytical results is presented below: <br /> Land Application Area Facility Area <br /> Analytes Units MWl MW2 MW3 AverageA-C <br /> BOD mg/1 136.2 4.3 4.4 6.3 <br /> TDS mg/1 1,254.8 1,466.8 1,355.2 1,633.3 <br /> Fixed TDS mg/1 1,204.0 963.8 1,039.6 1,316.7 <br /> NO3 as Nitrate mg/l 153.8 168.0 135.4 203.3 <br /> Chloride mg/1 91.6 152.0 251.6 116.0 <br /> Potassium mg/l 3.4 3.4 4.8 7.3 <br /> Sodium mg/1 248.2 221.5 193.6 266.7 <br /> Elec. Cond. µmhos/cm 2,249 2,392 2,304 2,466.7 <br /> 32. These WDRs further require evaluation of shallow groundwater conditions, including background <br /> water quality and direction of groundwater movement throughout the year. <br /> 33. Employee showers and newer restrooms are piped to the domestic wastewater lift station where it <br /> is pumped to the City of Manteca's treatment system. Domestic wastewater is not co-mingled <br /> with the process water. Some of the older restrooms are connected to septic tanks. <br /> 34. Stormwater collected at paved areas and loading docks is piped to the wastewater treatment <br /> system. Stormwater which falls on buildings is discharged to stormwater retention basins. <br /> 35. The majority of industrial activities at the facility are not exposed to storm water, because they are <br /> housed indoors. CNP is coded under the Standard Industrial Classification system as 2099, Food <br /> Preparations,Not Elsewhere Classified. Therefore, for the purpose of coverage under the NPDES <br /> General Permit for Discharges of Storm Water Associated with Industrial Activity, CNP is considered <br /> lV1vp'�FiluNiuM.l N.�PVWmCNKWpRI Cs <br />