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C` kr�.s ��k,' m - "�- � '^n.� 3 •may 'S"i �"' ' '^ <br /> �S7 �����t. "otY'�/ y� M� c��t'aT' `S��'h ,� ��' •t xC 7K�a�y RS ,.� i�r"'i� � :� ~ `a 3-v`,+�,.r�8'�fF' �k ,�"„ Y'�6 n_ a?, <br /> i' <br /> A T <br /> Egg <br /> r <br /> SOIL REMEDIATION PROPOSAL <br /> TEXACO SERVICE STATION <br /> 440 WEST CHARTER WAV <br /> STOCKTON,CALIFORNIA <br /> September 11, 1991 <br /> 1.0 INTRODUCTION <br /> This work plan was prepared to propose the installation of four rested vapor-extraction wells(VEWs) <br /> at the Texaco service station located at 440 West Charter Way,Stockton,California(Figure 1,Appendix A). <br /> ?he nested VEWs are being proposed to remediate hydrocarbon Impacted soils beneath the operating <br /> service station. This work plan was requested by the San Joaquln County Environmental Health Division <br /> and is authorized by Texaco Environmental Services. <br /> 2.0 BACKGROUND <br /> Fifteen vertical soil borings and ons angle boring have been drilled at the site(Figura 2,Appendix <br /> A). A total of 79 soil samples were analyzed by a state-certified laboratory. Table 1 (Appendix B) presents <br /> the results of these anat,eses. Based on the analytical results of solf samples collected from the borings, <br /> hydrocarbon Impacted soiis beneath the site are confined to the northeast corner of the property. It is not <br /> known how far the Impacted soil extends toward Charter Way. Further subsurface exploration Is not feasible <br /> since Charter Way is State Route 4 and Cal Trans will not permit borings In the fight-of-way. The impacted <br /> soils are encountered at a depth of 15 feet below ground surface (BGS) and extend to the water table at <br /> approximately 39 feet BGS. These soils consist of clays from 15 to 30 feet BGS and grade to a fine silty <br /> sand at depths below 30 fejt BGS. Figures 3 and 4 (Appendix A) present generalized geologic cross <br /> sections of the subs:jrface soils and the approximate extent of adsorbed hydrocarbons. The volume of <br /> Impacted sail has been estimated at approximately 3,000 cubic yards with average concentrations of <br /> adsorbed hydrocarbons ranging between 500 and 1,000 parts per million (ppm). Assuming a soil density <br /> of 2,900 pounds per cubic yard,the weight of hydrocarbons In the soil is between 4,350 and 8,700 pounds. <br /> 14 GROUNIMIATE <br /> G075COST.IA6 i.7'tiCllmol.OGY,INC. <br />