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i <br /> INFORMATION SHEET <br /> ORDER NO. 5-01-145 <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 ag <br /> gegate processing <br /> facility and mine areas at 24717 Brandt Road, Clements, San Joaquin County. KRC processes earth <br /> materials excavated in the 1,048 acre'p. erty. 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 2016. 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.m <br /> illion tans of aggregate per year. Most of the 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 the wastewater.. <br /> Groundwater is reported to occur approximately 200 to 300 feet below the ground surface. However, <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 <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 <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 /> r <br /> TRO: 6/14101 <br /> i <br /> f <br /> 1 <br /> 3� <br /> CNMy Doe =LvM/i"lmwbl%wydY4'&i=Ax ife Ri. kiddoc <br />