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Depth to groundwater beneath the site is approximately 30-35 <br /> feet below grade based on information gained from boreholes <br /> drilled on an adjoining property. According to the San <br /> '} Joaquin Flood Control and Water Conservation District <br /> ( 1987) , groundwater flow is to the southwest. <br /> 2. 7 Proximity of private, municipal and irrigation g wells: <br /> A survey of all active, inactive and destroyed water supply <br /> and monitoring wells within a one-half mile radius of the <br /> project site will be conducted. <br /> 2. 8 Distance to structures on-site and associated u/g utilities: <br /> The locations of buildings and utility lateral on the site <br /> are shown on Figure 2. <br /> 3. 0 PROPOSED WORKPLAN <br /> 3. 1 Purpose and Scope/Methods <br /> G <br /> I. in order to determine the lateral and vertical extent of <br /> soil contamination at the project site, WaterWork <br /> intends to re-excavate the former tank pit area. The <br /> - pht--D excavation will be expanded until no evidence of <br /> petroleum hydrocarbon contamination ( i . e. soil <br /> discoloration or petroleum odors) is noted in the pit <br /> sidewalls or floor by the field geologist. A total of <br /> L five ( 5 ) soil samples will be collected from the pit <br /> floor and sidewalls in accordance with WaterWork' s Soil <br /> Sampling Protocol (Appendix II ) . The samples will be <br /> be, analyzed for benzene, toluene, ethylbenzene, xylenes <br /> (BTEX) , total petroleum hydrocarbons as gasoline (TPHG) <br /> lJ total extractable hydrocarbons (TEH) , ethylene dibromide <br /> ( EDB ) , and total and extractable lead . B .C . <br /> Q.5 Laboratories, a State certified laboratory, will analyze <br /> Qd the samples for the above menti eats <br /> -utilizing EPA 8020, 8015, 8010, a 418. 1 me hodologie x' <br /> respectively. ` 7q <br /> lel i�S•! loot 413 ! &6*/e 2Q <br /> 2. All excavated material will be placed on pla tic <br /> sheeting, covered with same, and remain on-site pendingpD' I <br /> laboratory results. Thereafter, a proposal for treatment <br /> or disposal of the excavated material will be prepared. <br /> 3. All site activities involving potential contact with <br /> hazardous materials ( e. g. hydrocarbon contaminated <br /> soils) will be conducted in accordance with WaterWork's <br /> Health and Safety Plan (Appendix III ) . <br /> 4. A Problem Assessment Report will be prepared in <br /> accordance with Regional Board guidelines summarizing <br /> the findings of the investigation and recommending <br /> remedial action alternatives, as appropriate. The field <br /> 3 <br />