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k <br /> INFORMATION SHEET Ik <br /> ORDER NO. <br /> KNIFE RIVER CORPORATION DBA KRC AGGREGATES <br /> AGGREGATE MINE AND WASTEWATER SYSTEM <br /> SAN JOAQUIN COUNTY <br /> Knife River Corporation dba KRC Aggregates owns and operates the KRC aggregate processing, <br /> q Y• <br /> facility and mine areas at 24717 Brandt Road, Clements, San Joaquin Count KRC processes earth <br /> materials excavated in the 1,048 acre property. The facility was constructed in the 1986; KRC has <br /> owned the facility in the 1950's. The mine is expected to operate until approximately year 12016. KRC <br /> does not presently operate a concrete plant or an asphalt plant; a concrete plant was operated at the <br /> facility in the past. <br /> KRC expects to produce approximately 0.9 miilion tons of aggregate per year. Most of thel',water used <br /> in aggregate washing is recycled but due to evaporation and percolation, make up water(fresh water) <br /> is needed. The wastewater is discharged to settling ponds. No flocculants are-added to thel wastewater. <br /> Groundwater is reported to occur approximately 200 to 300 feet below the ground surface. ;However, I <br /> based on the presence of groundwater springs in the area groundwater, at least seasonally, exists at <br /> depths less than 200 to 300 feet depths. Groundwater is not encountered.in the excavations'. The <br /> wastewater ponds are located at or slightly below grade. No groundwater monitoring wells-exist on <br /> the property,.one industrial process supply well exists at the aggregate processing equipment. This r <br /> Order does not require groundwater monitoring because chemicals are not added to the wastewater and <br /> because of the low likelihood of the discharge impacting groundwater quality. This Order does require <br /> monitoring of flow rate, wastewater pond freeboard, and wastewater pond capacity. In addition, the . I <br /> Discharger shall submit updated site maps identifying the location of wastewater ponds and'updated <br /> water balances to evaluate the wastewater ponds' capacities. <br /> Domestic wastewater is discharged to a septic tank permitted by the San_Joaquin County. <br /> Environmental Health Department. The surrounding land uses are primarily agricultural. <br /> 1 <br /> TRO: 4/13/2001 <br /> it <br /> C:Tmjmt FiWSilaVKRC AgUcSAa1nfo.dm <br />