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MUSCO FAMILY OLIVE COMPAN*D THE STUDLEY COMPANY _3_ <br /> WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> INSPECTION REPORT <br /> Constituent Units Result Water Quality Standard Beneficial Use Protected <br /> BOD m /I 25 <br /> TDS m /I 3,700 450/500 agriculture/drinking water <br /> FDS m /I 2,800 <br /> Aluminum /I 2,400 50-200/87/5,000 drinking water/aquatic life/agriculture <br /> BariumI.Ig/I 390 1,000 drinking water <br /> Boron /I 490 700 agriculture <br /> Calcium m /I 70 <br /> Chromium /I 5.8 50/hardness-dependent drinking water/aquatic life <br /> Copper /I 15 hardness-dependent/200/1,000 aquatic life/agriculture/drinking water <br /> Iron /I 4,500 300/1,000/5,000 drinking water/aquatic life/agriculture <br /> Magnesium m /1 20 <br /> Manganese /I 610 50/200 drinking water/agriculture <br /> Nickel /I 37 100/200 drinking water/agriculture <br /> Potassium m /I 210 <br /> Sodium "/10.21 <br /> 30-60/69 taste and odor/agriculture <br /> Vanadium 100 agriculture <br /> Zinc hardness-dependent/2,000/5,000 aquatic life/agriculture/drinking water <br /> beta-BHC 0.0091-0.25 drinking water <br /> gamma-BHC (Lindane) 0.019-0.2/0.08 drinking water/aquatic life <br /> SUMMARY: <br /> As shown in the above table, total and fixed dissolved solids, manganese, sodium, and vanadium <br /> were each detected in the reservoir at concentrations in excess of levels recommended to protect <br /> the beneficial use of agricultural irrigation supply. In addition, based on past monitoring by both <br /> Musco and Regional Water Board staff, chloride and iron have also been detected in the <br /> wastewater at concentrations in excess of recommended levels to prevent reduction of crop yield. <br /> The presence of beta- and gamma-hexachlorocyclohexane (benzene hexachloride or BHC) in the <br /> reservoir is of some concern, as these two constituents are persistent organochlorine pesticides. <br /> The lack of tailwater flow measurement for fields with gravity-returned flows violates Monitoring <br /> and Reporting Program No. R5-2002-0148, which requires that tailwater return flows be metered <br /> by 1 October 2002. Lack of information regarding tailwater generation also poses difficulties in <br /> planning for water management and precludes preparation of an accurate and useful water <br /> balance for the land application areas and reservoir. <br /> The erosional rills and turbid tailwater in Field 55-West indicated inadequate erosion prevention <br /> measures and violation of the following requirement contained in WDRs Order No. R5-2002-0148: <br /> • Land Application Area Specification D.14, which requires that "[d]ischarges to the land <br /> application area shall be managed to minimize both erosion and runofffrom the land application <br /> area." <br /> As described above, mudboxes/sumps in fields with gravity-returned tailwater flows have outlets <br /> placed approximately three feet above the bottom of the sump, resulting in standing water. The <br />