SITE INFORMATION AND CORRESPONDENCE

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MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY -2- WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY INSPECTION REPORT Field 55-West was being irrigated on the day of the inspection and sufficient tailwater was – available for sampling. Erosional rills noted in previous inspections were still present. Samples were collected from the outfall of the pipeline _ leading from the 55-West mudbox/sump into the reservoir. The samples were turbid with ;• �'_` , sediment. Tailwater samples were analyzed for } biochemical oxygen demand (BOD), total and 3i h c fixed dissolved solids, and various inorganics. K - The analytical results are attached. <` ' ' �` ► Prior to collecting the tailwater samples, Kelly and I discussed the mudboxes and tailwater return - flows. The mudboxes are four feet deep and the vertical location of the outlets vary depending on Figure 2—Field55-WestTailwaterSampling Location qi how the tailwater is returned to the reservoir; mudboxes for which tailwater is pumped back to the reservoir have outlets at the bottom of the box, while mudboxes for which tailwater is returned to the reservoir by gravity flow have outlets placed higher on the box. The outlet for the Field 55-West mudbox/sump that we collected samples from appeared to be placed approximately three feet from the bottom of the box. I asked Kelly whether the box would be emptied by the following day and when the field would next be irrigated. Kelly said that the field would likely be irrigated the next day and that the box would not be emptied unless Musco staff l-figure 3—Field 55-West Mudbo.vIsunip manually emptied it. I reminded him of Waste Discharge Requirements (WDRs) Order No. R5-2002-0148, Land Application Area Specification D.15, which requires that "[t]here shall be no standing water in the land application areas 24 hours after wastewater is applied, except during periods of heavy rains sustained over two or more consecutive days." Kelly stated that he thought the land application areas did not include the tailwater conveyance facilities. When I saw the pipe that conveyed tailwater collected in the mudbox/sump for Field 55-West to the reservoir, I asked where the flow measurement was taken. Kelly responded that the tailwater flows for fields with gravity-returned flows are not measured. I expressed concern over the ability to perform an accurate and useful water balance for the site without knowing these flows. As stated above the analytical results for the samples collected during this inspection are attached. Constituents detected in the reservoir samples are shown below: