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Pombo Ranch Property <br /> p tY <br />' 24100 S. Lammers Road, Tracy, California <br />' Subsurface Investigation Report <br /> 1.0 PROJECT IDENTIFICATION <br /> The following scope of work was conducted to determine the extent of the soil and <br /> groundwater impacted by underground tank(s) previously removed from the Pomba <br />' Ranch Property. A Geoprobe" soil and groundwater sampling device was used to find <br /> the lateral limits of petroleum in the soil and ground water. The information was then <br /> used to locate three groundwater-monitoring wells at the edge of the groundwater plume. <br /> 1.1 Site Description and History <br />' Specific areas of concern were identified during a recent Environmental <br /> Assessment for Bright Development, a prospective buyer of the subject property. <br /> A portion of the property at 24100 S. Lammers Road is occupied by a farming <br /> l <br /> facility, which includes residential dwellings, a barn, equipment sheds and shops. <br /> ie Tractor storage, repairs, and fueling are conducted in this area which fronts 11'" <br /> Street. Some pesticide and above ground fuel storage was apparent during the <br /> recent inspection. Records indicate that the improvements to the parcel started in <br /> 1930. The undeveloped acreage is used for irrigated crops and/or pasture. <br /> a' Two underground tanks were listed in the state records review as in use at the <br /> 24100 S. Lammers Road property but had been removed before 1993, Since the <br /> tanks were farm exempt they may have removed without the normally required <br /> ' soil sampling. Several above ground tanks are in use at this site. The above <br /> ground tanks are located together centrally in the shop and barn area. Historical <br /> photographs show that one of the above ground tanks was located next to the <br /> ' tractor shop. <br /> On September 16, 1998 M.J. Kloberdanz & Associates drilled 8 Geoprobe soil <br /> ' borings to five feet below groundwater (average depth 15' bgs). A soil sample <br /> was obtained from the capillary fringe in seven of the eight borings. Additional <br /> ' soil samples were collected from cores with possible contamination. Water <br /> samples were collected from all eight borings. <br /> ' Boring B-1 was drilled in an area of a small pesticide spill identified by the <br /> property owner. Petroleum analysis was included in some of the samples because <br /> • of the close proximity to the fuel storage area. Borings B-2, 3, & 4 were drilled <br /> around the above ground fueling area with boring B-3 located at the location of <br />