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1 <br /> r' <br /> i Pombo Ranch Property <br />' 24100 S. Lammers Road, Tracy, California <br /> ' Subsurface Investigation Report <br /> 1 <br /> 1.0 PROJECT IDENTIFICATION <br /> ' The following scope of work was conducted to make a preliminary determination of the <br /> potential impact of the soil and groundwater contamination associated with an <br /> ' underground tank previously removed from the Pomba Ranch Property. Geoprobe':�' soil <br /> borings were used to define the vertical and lateral limits of contamination in the soil and <br /> ground water and three groundwater-monitoring wells installed at the limits of the <br /> ' groundwater plume. <br /> 1.1 Site Description and History <br /> Specific areas of concern were identified through an Environmental Assessment <br /> for Bright Development, a prospective buyer of the subject property. A portion of <br /> the property at 24100 S. Lammers Road is occupied by a farming support facility, <br /> which includes residential dwellings, a barn, equipment sheds, and shops. <br /> Records indicate that the improvements to the parcel started in 1930. A mobile <br /> ' home was moved onto the property in the late 1970's. Potable water for domestic <br /> use is supplied from a private well located approximately 140 feet from the <br /> release. Private wells are also located at 24124 Lammers Road and at a residence <br /> ' west of Lammers Road. Construction details and production rates for the wells <br /> are not available. <br /> ' Tractor storage, repairs, and fueling are conducted in the farm support facility <br /> which fronts on IIth Street. Pesticide use and above ground fuel storage was <br /> apparent during the site assessment inspection. The undeveloped acreage is used <br /> for irrigated crops and/or pasture. Irrigation water is provided by imported <br /> surface water it supplied by the unlined Westside Irrigation District, Lower Main <br /> Canal on the western and southern boundary of the site. <br /> Two underground tanks are listed in the state records review as in use at the <br /> 24100 S. Lammers Road property. The tanks are reported to have been removed <br /> before 1993. Since the tanks were farm exempt they may have removed without <br /> the normally required permitting and confirmation soil sampling. Several above <br /> ' ground tanks are also in use at this site. The above ground tanks are centrally <br /> located in the shop and barn area. Historical photographs show that one of the <br /> Mabove ground tanks was previously located next to the tractor shop. <br />