COMPLIANCE INFO_PR0440063_1990-2019

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WASTEWATER RECLAMATION REQUIREMENTS 2 MUSCO OLIVE PRODUCTS, INC. AND THE STUDLEY COMPANY WASTEWATER DISCHARGE TO LAND SAN JOAQUIN COUNTY 8. Soils at the facility are predominately clay,clayey silt, and silty clay. Two thirds of the western portion of the facility is located on materials from the Pliocene period which consist of sedimentary deposits of the Tulare and Laguna formations. The other one third (eastern) is situated on Pleistocene nonmarine sediments. Surface soils are of the Ambrose Clay Formation (Calla-Carbona Complex, Carbona Clay Loam)consisting of dark brown or dark grayish-brown strongly developed secondary material from sandstones, shales, and other sedimentary rocks and tend to have low permeability rates. The nearest active Holocene fault is the Greenville Fault, which is 4.5 miles away. 9. Evaporation at the site is greater than 100 inches per year, while rainfall is less than 15 inches per year. 10. Ground water monitoring well W2 was constructed to monitor perched ground water downgradient of the facility's surface impoundments. Perched ground water is encountered at 29 feet below ground surface(bgs). Additional monitoring wells, constructed adjacent to the surface impoundment, were constructed to 90 feet bgs and did not encounter ground water. The Discharger has indicated that the perched ground water zone does not extend beneath the entire site as verified by surface and subsurface soil conditions explored by boring and backhoe test pits as described in RWQCB Water Quality Monitoring Program report,dated 21 December 1992. 11. Ground water samples collected in 1985 from W2 contained 920 mg/L TDS, 32 mg/L chloride, and 264 mg/L sodium. The monitoring well went dry in January 1987 shortly after operations began, but is still examined for a return of the aquifer. 12. The Musco Olive#1 production well encountered artesian water at 250 feet bgs with a static head at 50 feet bgs. Based on a single sampling event in February 1996, water quality for this well showed chloride(514 mg/L), sulfate (400 mg/L), sodium (477 mg/L), total dissolved solids (1,434 mg/L), electrical conductivity (2240µmhos/cm), and a pH of 7.8. This well will be monitored for background water quality. 13. Five existing production water wells downgradient of the site were sampled on 22 November 1985. The wells are dispersed approximately 3000-5000 feet from the facility and were drilled to depths ranging from 193 to 607 feet. The Musco Olive#1 and W2(on-site shallow well) were also sampled for background water quality. Accumulative results of sampling showed a mean and standard deviation for TDS of 1219 mg/L and 363 mg/L, respectively. Chloride results showed the mean at 211 mg/L and standard deviation of 130 mg/L. Other parameters/constituents of concern include sulfate, nitrate, iron, manganese, and electrical conductivity. 14. The beneficial uses of ground water beneath the facility are municipal and domestic supply, agricultural irrigation, stock watering, industrial process supply, and industrial service supply. 15. Surface water runoff from the upper parcel goes under culverts in the railroad embankments. It then commingles with the surface water runoff on the lower parcel. This water combines into one stream channel which passes diagonally through the lower site and exits the facility and flows under Highway 580 near the lined ponds into an unnamed, dry creek bed.