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N%.01 MONITORING WELL INSTALLATION WORK PLAN WKA No. 5279.02 January 30, 2004 Page 2 Topography in the vicinity of the site is relatively flat,with elevations decreasing very gradually from east to west. According to the USGS Thornton 7.5-minute topographic quadrangle(1968, revised 1993),the East Facility has surface elevations of about 20 to 25 feet above mean sea level and the West Facility has surface elevations of about 10 to 15 feet above mean sea level. East Facility Operations As requested by the RWQCB, following is a brief description of operations at the East Facility. Activities at the East Facility include fermentation and processing into finished wines,bulk transfer of grape juice and finished wines,bottling,and distribution. Wastewater from East Facility operations is screened to remove solids and then collected in a concrete sump in the northwestern comer of the East Facility. Wastewater is pH-adjusted(to neutral pH)at the sump and then pumped through a pipeline to the ponds at the West Facility. Solids screened from the wastewater are collected in containers and subsequently hauled off-site as agricultural waste. Stormwater from the northern portion of the East Facility,including runoff from all processing areas,is directed to the wastewater sump. Stormwater from the southern portion of the site, including runoff from the warehouses (exterior)is directed to the stormwater detention pond near the southern tip of the East Facility. It is our understanding that stormwater flowing to the detention pond does not contact or commingle with winery waste solids or wastewater. All receiving, crushing, and pressing of grapes is conducted at the West Facility. Physiographic and Hydrogeologic Setting The Geologic Map ofthe Sacramento Quadrangle, California, 1:250,000(Wagner et al., 198 1) shows the site to be underlain by the lower member of the Pleistocene Modesto Formation. The lower member of the Modesto Formation consists of unconsolidated, slightly weathered gravel, sand, silt, and clay that are commonly tan and light gray(Helley and Harwood, 1985). Soil boring logs for MW 1 through MW3,prepared by Neil O. Anderson&Associates, hic., show 10 to 12 feet of sandy silt overlying a 2-to 7-foot-thick clay deposit that is encountered between 10 and 15 feet below ground surface. The logs indicate that medium- to coarse-grained sand was encountered directly below the clayey layer,at approximately 15 feet bgs, and persisted to at least 36 feet bgs (the maximum depth explored). `K WALLACE•KUHL -- &A550CIATES INC.