SITE INFORMATION AND CORRESPONDENCE CASE 2

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WASTE DISCHARGE REQUIREM S ORDER NO. • S- PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT AND DISPOSAL FACILITY SAN JOAQUIN COUNTY 25. The Board received odor complaints in October 1987, July 1997, July 1998, March 2000, and July 2000. The odor complaints concerned the Discharger's land treatment and disposal operations. 26. Based on the anticipated wastewater quality discharged from the treatment facility when operated properly, discharge of the wastewater should comply with the BOD Effluent Limitations presented in Section BO. Compliance with the effluent limits,combined with careful management of the wastewater application area, should control objectionable odors at the application area. loading,27.The annual flOw . The antieipated flow rate is 200,000 . �tin4;afion A••plioc�vRAre Leading Rat E-'eristitxet3t Units, BOD5 398 4-7-.6 10,37,8 Nitfog W19q 40 4'7.6 4-,354 TBS M94 4-,2� 4,L6 44,243 25:27.Soil borings were drilledtaken in the land application area in July 1988. The soil was described as silt, sand, and clay mixtures. According to the San Joaquin County Soil Survey,the soils underlying the land application site consist of a loamy coarse sand and a fine sandy loam, with rapid and moderately rapid permeabilities, respectively. The sandy loam soils contain a weakly cemented to a strongly cemented hardpan layer at a depth of four to six feet. Several years ago,the Discharger deep- ripped through this hardpan layer to improve percolation. 39:28. Three shallow groundwater monitoring wells were installed at the application site in July 1988. The locations of Wells MW-2 and MW-3 are shown in Attachment B. The portion of the previous application area that contained Well MW-1 was developed as a warehouse facility. Groundwater levels have been monitored by the Discharger since June 1994. However, mwanyuch of the elevation data are offs poor quality and may not be reliable. The depth to groundwater is approximately 10 to 15 feet below ground surface (bgs). The dive.fiee efshallow gfeti•,dwate- mo ..t appears t b generally I,.. est 39:29. The City of Lathrop operates three drinking water supply wells which are located between Lathrop Road,Louise Avenue, McKinley Avenue, and the Western Pacific rail line. The closest of the municipal wells is approximately 1.0002;088 feet east of the application area. 34-30. The average analytical results for groundwater samples collected since 1994 from Wells MWI,MW2, and MW3 are presented below. Also presented is the average concentration of analytes in samples collected from monitoring wells located at the processing facility(Wells A,B, and C)where land application has not occurred. Regular quarterly sampling was riot-initiated until May 1998;prior to that time samples were collected infrequently dating back to 1988. The data averaged below consists of between four to nine sample events. The facility data is averaged from one sampling event performed on 24 July 2000. A summary of the average analytical results is presented below: �ly��:x I. +.. 'yAYn.Nftlwl4ri-1..F.w_�'i.V44w