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�• Page 2 <br /> Cabral Property <br /> February 28, 2006 <br /> Our firm prepared a Phase I Environmental Site Assessment of the property dated October 5, <br /> 2005.1 Our study revealed a number of conditions warranting further investigation, including: the <br /> potential for pesticide contamination within the orchard areas and near out-buildings; the potential <br /> for petroleum hydrocarbon and metals contamination to surface soils near the buildings; and, the <br /> potential for petroleum hydrocarbon contamination in the vicinity former 1,000-gallon <br /> underground gasoline storage tank that was removed in 1989. <br /> To evaluate the concerns presented in our referenced Phase I study, in October 2005 our firm <br /> collected a number of surface soil samples from the orchard areas and near the buildings for <br /> laboratory analysis. In addition, we advanced two direct push borings in the vicinity of the <br /> former underground storage tank; subsurface soil samples collected from the borings were <br /> submitted for laboratory analysis. The sampling/laboratory testing did not reveal elevated <br /> concentrations of pesticides within the orchard portions of the site. However, some of the surface <br /> soil samples collected within and near on-site buildings contained organochlorine pesticides and <br /> metals (lead and arsenic) at concentrations that may warrant health concern given the <br /> contemplated residential subdivision redevelopment of the property. Additionally, soil samples <br /> collected from depths of 15 and 20 feet from one of the borings in the former underground storage <br /> tank area contained significant concentrations of gasoline-range petroleum hydrocarbons. The <br /> lateral and vertical limits of soil impairment at the site have not been determined. <br /> PURPOSE AND SCOPE OF WORK <br /> General <br /> The purpose of the proposed additional investigation will be to further characterize the extent of <br /> organochlorine pesticides, lead, and arsenic near the on-site structures, and the extent of <br /> petroleum hydrocarbons in the area of the former underground storage tank. All drilling and <br /> sampling activities will be overseen by a Professional Geologist from our office. The results of <br /> this additional site characterization will be used for preliminary consideration of appropriate <br /> remedial actions. <br /> Permitting and Underground Service Alert <br /> Prior to the proposed field activities, we will obtain the necessary permits for the advancement of <br /> direct push borings on the site. Underground Service Alert will be notified prior to drilling <br /> activities locate on-site underground utilities so they could be avoided during exploratory <br /> activities. <br /> Shallow Soil Sampling near Buildings <br /> Our sampling activities will be performed following County review of this Workplan. We will <br /> advance up to 20 shallow hand excavations via a shovel or hand auger at locations in the vicinity of <br /> ' Raney Geotechnical, Inc.; "Phase I Environmental Site Assessment, Cabral Property, APNs 115-230-06, and -07, <br /> 4202 through 4208 North Sutter Street,Stockton,California";October 5,2005;Reference No. 1828-092. <br /> 2 <br />