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12/03/2003 14:25 2095224227 GEOLOGICAL TECHNICS PAGE 05 I C�eDC�gicaC�QCGL�tr�CS�fZC. . 1101 Th Strict Modesto,Callfomia 95354 (209)522-4119/Fax#522-4227 Work Plan i Soil and Groundwater Investigation Cardoza Enterprises 1151 Louise Avenue Manteca, CA Project No. 1135.2 Decer fiber 2, 2003 1.0 INTRODUCTION In November of 2002 soil samples were obtained from beneath the gasoline dispenser islands at the site. A minor amount of MTBE (0.09 mg/kg)was detected in soil sample"D-3". In a letter dated October 17, 2003 Cardoza Enterprises was directed by San Joaquin County Environmental Health Department to submit a work plan to determine the vertical and horizontal extent of the contamination(see Figures 1 &2). i 2.0 PROPOSED INVESTIGATION To further investigate the extent of soil and groundwater impacted with gasoline range petroleum hydrocarbons, Geological Technics Inc_ proposes to install three (3) GeoProbe j boreholes (GP7.1 through GP-3), collect soil and groundwater samples, and analyze these samples for petroleum hydrocarbon compounds. I The proposed locations of the 'GeoProbes are illustrated in Figure 2. The locations are intended-to define the extent of the soil plume and to determine if groundwater has beers impacted by the release. The actual location of the probes will be selected in the field, as riurnerous utility lines exist below ground surface at the site. j 2,1 GeoProbell`iydxopunc)r Survey Soil Core Sara lin Three GeoProbe boreholes will be drilled.as indicated in Figure 2 to a maximum depth of 35 feet below grade surface. Soil samples will be collected at five-foot intervals down to the capillary fringe,: I The boreholes will be drilled with a GeoProbe rig owned and operated by V&W Drilling of Isleton, CA(C57# 720904). The GeoProbe advances a coring tool with a pneumatic hammer to a selected depth. Upon reaching that depth the coring tool is opened and advanced further