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0 <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. <br /> WASTE DISCHARGE REQUIREMENTS. <br /> FOR <br /> MUSCO OLIVE PRODUCTS. INC. <br /> AND <br /> THE STUDLEY COMPANY <br /> CLASS II SURFACE IMPOUNDMENTS <br /> TRACY PLANT <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board. Central Valley Region, (hereafter Board), <br /> finds that: <br /> 1 . Musco Olive Products, Inc. (hereafter Discharger) operates an olive packing plant on property <br /> owned by the Studley Company. The facility was previously regulated by Waste Discharge <br /> Requirements (WDRs) Order No. 86-074. <br /> 2. This property is described by Assessor's Parcel Number 209-110-14 in Section 34, T2S, <br /> R4E,MDB&M. At an elevation of 280 feet above sea level, the processing plant is on the <br /> eastern slope of the Diablo Mountain Range. The facility is south of Interstate 580 and east of <br /> Patterson Pass=Road,-near-Tracy, as:-shown on--Attachment A, which isincorporatedherein <br /> and made a part of this order. <br /> 3. The Discharger discharges an average of 20,000 gallons per day (gpd) of process wastewater <br /> to two Class II surface impoundments referred to as Ponds A and B. The capacity of Pond A <br /> is 38.5 acre-feet. The capacity of Pond B is 32.3 acre-feet. Ponds A and Bare shown on <br /> Attachments B and C, which are incorporated herein and made a part of this Order. A third <br /> pond(Pond C) is authorized by these waste discharge requirements. but has not yet been <br /> constructed. <br /> 4. Ground water beneath the site occurs in three zones. These are: (1) a shallow perched zone of <br /> limited areal extent. (2) a large confined aquifer of poor quality water at a depth of about 225 <br /> feet, and(3) a second confined aquifer of poor quality water at a depth of about 575 feet. The <br /> strata above the first confined aquifer consists mostly of sandy, silty clay, sandy silt and <br /> clayey/sandy silt. The strata between the two confined aquifer zones consist of a massive clay <br /> zone known as the Corcoran Clay. In 1985, a deep boring was drilled to a depth of 225 feet <br /> on the west side of Pond A. No free ground water was found and the boring was destroyed. <br /> 5. The on-site Musco Olive#1 well encountered artesian water at 250 feet below ground surface <br /> (bgs)with a static head at 50 feet bgs. Based on a single 1985 sampling event water quality <br /> for this well showed chloride (439 mg/1), sulfate (549 mg/1), sodium(495 mg/1),TDS (1730 <br /> mg/1),electrical conductivity (2700µmhos/cm), and a pH of 7.8. This well will be monitored <br /> for background water quality. <br /> 5. In 1985,four shallow borings (W 1 through W4) were placed around Ponds A and B. Only <br /> one of these borings encountered water, which was at a depth of 29 feet bgs. This boring <br /> W2,near the northeast comer of Pond B,was developed as a monitoring well. Subsequent to <br /> rhP;neat fry wWz on,welLW2-w-en19�but continues to-be monitored for a <br />