FIELD DOCUMENTS AND WORK PLANS 1991

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shall be drilled at a 450 angle from vertical . IW-6 and 7 shall be oriented parallel with retort numbers 1 and 2; IW-8 shall be oriented at a horizontal angle of approximately 150 west of the east face of the retort pit; and IW-9 and IW-10 shall be drilled vertically as shown on Drawing G-2. Split barrel , ring-lined split barrel , and thin-walled tube sampling shall be performed in accordance with requirements of Section 2A-5. Hollow-stem auger drilling shall be performed as required to satisfy the requirements for advancing the boring and cleaning the borehole for each sampling procedure. Borings for the angled injection wells (IW-6, 7 and 8) shall have a minimum inside diameter of 4-1/4 inches. The hollow-stem auger boring for IW-9 and IW-10 shall have a minimum inside diameter of 6-1/4 inches. The boring for the extraction well shall have a minimum outside diameter of 12 inches. The borings for the lysimeters shall have a minimum outside diameter of 6-5/8 inches. Monitoring tube borings shall not be drilled using the hollow-stem auger method. The drilling equipment and materials required to perform the hollow-stem auger drilling shall be decontaminated. Grease and other lubricants shall not be used, unless approved by the Engineer, on the drill casing, drill rods, sampling equipment, or on tools required to perform the hollow-stem auger drilling. Water may be used to aid in the return of drill cuttings, when approved by the Engineer. The water shall be from a potable source approved by the Engineer. Contractor and Engineer shall each be responsible for providing sampling equipment, sample containers, and sample shipment supplies appropriate for their respective samples. 2A-5. SAMPLING METHOD AND FREQUENCY. Sampling shall include split barrel and thin-walled tube sampling as designated herein, in accordance with the Sampling and Monitoring Plan, and as specified by the Engineer. The frequency of subsurface soil sampling by the Contractor, Engineer, and Owner' s agent shall be in accordance with Section 3.2.1 of the Sampling and Monitoring Plan. Samples to be tested shall be selected by the Engineer. The Contractor shall be responsible for collecting and preparing all soil samples for physical analyses. The Engineer will be responsible for submitting the soil physical samples to a qualified laboratory. The Engineer will also be responsible for collecting and submitting all soil and ground water samples for chemical analyses. (MARLEY SSFS ) 2A-4 (CONTRACT NO. 13) (11654.652 )