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i • <br /> Soil samples collected for chemical analyses will be collected in brass <br /> tubes and sealed with teflon, end caps and tape The sealed tubes will be <br /> placed in a cooler at 41 centigrade and transported to a DHS certified <br /> laboratory under chain-of-custody procedures; <br /> * Analysis of approximately thirty (30) soil samples for Total Petroleum <br /> Hydrocarbons as gasoline and volatile aromatics using DOHS LUFT/EPA <br /> Methods 8015 modified and 8020, respectively, <br /> * Prepare field boring logs; <br /> Prepare a written report summarizing the results of the investigation with <br /> conclusions and recommendations The report will be certified by a <br /> California Registered Geologist <br /> 13 Schedule <br /> AquaGeosciences, Inc anticipates beginning work described herein within one <br /> week upon approval from the County and authorization to proceed from Cnsp <br /> Construction. The soil borings can be dnlled and sampled in approximately one <br /> working day The analytical data will be reported within two weeks and the report will <br /> be completed within two weeks after receipt of the analytical results <br /> • 20 Background <br /> The site, Thiemann's Service, is located at 106 West Second Street, Ripon, <br /> California as shown on Exhibit 1 <br /> 2.1 Property Description <br /> The property is shown on Exhibit 2 The property houses one building <br /> Previously located at the site were two (2) 5,000 gallon leaded gasoline underground <br /> storage tanks and one (1) 10,000 gallon leaded gasoline underground storage tank. <br /> 22 Project History <br /> On March 26, 1991 , SEMCO removed three (3) underground storage tanks <br /> two (2) 5,000 gallon leaded gasoline (Tank 1 & 2), and one (1) 10,000 gallon leaded <br /> gasoline (Tank 3) from the above mentioned property Soil samples were collected <br /> from beneath the removed tanks on both the east and west ends The samples <br /> collected were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg), <br /> Volatile Aromatics (BTEX), Total Lead, and ethylenedibromide (EDB) The analytical <br /> results indicated high concentrations of TPHg ranging from 325 mg/kg (milligrams per <br /> 3of12 <br />