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Une <br /> f�. <br /> April 29, 1588 <br /> PW 88-4924.03 Harding LawsonAoaoe0atoe <br /> Mr. Hal Miller <br /> The Southland Corporation <br /> Page 4 <br /> SCOPE OF SERVICES <br /> Our scope of services consists of the seven fallowing tasks: <br /> o <br /> Task 1: Data Collection and Check-off of Report <br /> Requirements <br /> Task 2: Soil-Gas SurvRy and Data <br /> Evaluation <br /> F <br /> Task 3: Field Investigation <br /> Task 4: Chemical Analyses <br /> Task 5: Engineering Feasibility Study <br /> Task 6: Report Preparation <br /> Task 7: <br /> Meetings with Southland and CVRWQCB s <br /> These tasks are further; described below. F <br /> Y6. <br /> i Rearuir��,ori}e C eck—Off f <br /> 5 � <br /> The Phase 1v investigation will begin with the data 'Collec- <br /> tion to complete the requirements of the Preliminary Re ort <br /> � . and the Problem Assessment Report.list of all requirements and indicatee�will compile a check- r <br /> (see Task &) , th® here in our report <br /> Pertinent information has been <br /> I This index of data will be provided. E <br /> f provided in the Phase IPJ report. <br /> i <br /> 771 7, <br /> The first .ste , <br /> P in assessing the lateral extent of fuel can_ <br /> stitu€nts in the vadose zone and in shallow ground water on- <br /> to ptrrform a aoi3-gas curveis <br /> piing and anal zin Y• Such a survey involves sam- <br /> g gas from pare spaces Of the unsaturated <br /> soilrs above the water table (vadose zone <br /> J used to evaluate and measure distribution.ofTvolatil$ique is <br /> S organic chemicals in soil and shallow ground water. Because <br /> many Petroleum hydrocarbons exhibit isignificant vapor ree- <br /> I surae, ,their i"Itroduction into subsurface soil results pin <br /> vaPor-phase permeation and transport. <br /> ` reach the water table and travelpwith 'groundewater,hydrocarbons <br /> vapors can volatilize and migrate upward into overlying <br /> soil. Thus, the presence of some organic compounds in the <br /> ;,: <br /> i <br /> r� <br />