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■ <br /> Pombo Ranch Facility <br /> ' 24100 S. Lammers Road, Tracy, California <br /> ' Subsurface Investigation <br /> & <br /> Second Quarter 2004 Groundwater Monitoring <br /> ' Report <br /> ' 1.0 PROJECT IDENTIFICATION <br /> ' The following scope of work was conducted to further define the lateral and vertical <br /> extent of the soil and groundwater impacted by underground tank(s) previously removed <br /> from the Pombo Ranch Property. Three additional groundwater monitoring wells were <br /> ' installed down gradient of the former tanks with one of the wells drilled to 40 feet below <br /> grade surface. All six wells were sampled for the required second quarter monitoring <br /> event. Nearby water well construction details were requested from DWR and included in <br /> this report. <br /> 1.1 Site Description and History <br /> Specific areas of concern were identified during a recent Environmental Assessment for <br /> ' Bright Development, a prospective buyer of the subject property. A portion of the <br /> property at 24100 S. Lammers Road is occupied by a farming facility, which includes <br /> residential dwellings, a barn, equipment sheds and shops. Tractor storage, repairs, and <br /> ' fueling are conducted in this area which fronts 11"' Street. Some pesticide and above <br /> ground fuel storage was apparent during the recent inspection. Records indicate that the <br /> ' improvements to the parcel started in 1930. The undeveloped acreage is used for <br /> irrigated crops and/or pasture. <br /> ' Two underground tanks were listed in the state records review as in use at the 24100 S. <br /> Lammers Road property but had been removed before 1993. Since the tanks were farm <br /> exempt they may have removed without the normally required soil sampling. Several <br /> above ground tanks are in use at this site. The above ground tanks are located together <br /> centrally in the shop and barn area. Historical photographs show that one of the above <br /> ground tanks was located next to the tractor shop. <br /> On September 16, 1998 M.J. Kloberdanz & Associates drilled 8 Geoprobeo soil borings <br /> to five feet below groundwater(average depth 15' bgs). A soil sample was obtained from <br /> the capillary fringe in seven of the eight borings. Additional soil samples were collected <br /> from cores with possible contamination. Water samples were collected from all eight <br /> borings. <br />