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The excavation will be inspected by personnel from the S3EHD to confirm the presence or <br /> absence of the leachfield Iines. If the lines are not present, the trench will be backfilled with the <br /> excavated soil and compacted. <br /> If the lines are present, the trench will be backfilled with the excavated soil and compacted. The <br /> lines will be removed at a later date. <br /> The cost estimate received from the subcontractor dc es not include replacing the ground surface <br /> with import gravel or re-surfacing the excavated area <br /> 4.4 Laboratory Analyses <br /> The soil samples will be submitted to Twining Labor tories, Inc., a California-certified analytical <br /> laboratory, for analysis. The analyses will be conducted on a normal turn-around basis in <br /> general accordance with U.S. Environmental Protection Agency (EPA) specified holding times. <br /> The analyses will be performed in general accordance with the following EPA methods listed. <br /> x <br /> Caltrans Matrix Analyse <br /> Item No. <br /> 100 Soil Total Petro eum Hydrocarbons as Gasoline EPA Method 8015 with <br /> GCFID(50,30) <br /> 101 Soil Total Petro eum hydrocarbons as Diesel EPA Method 8015 with <br /> t— GCF1D(35 0) <br /> } 118 Soil Elements E can ICAP(Cadmium,Chromium III,Chromium VI,Lead, <br /> Zinc,Nicke)EPA Method 6010 <br /> s <br /> 102 Soil Oil and Grc ase EPA Method 8015 with 5520 D&F <br /> l I 100 Soil BTEX EPA Method 8020 <br /> 116 Soil Chlorinatec Hydrocarbons EPA Method 8270 <br /> 115 Soil Oxygenate EPA Method 8260B <br /> Extra Soil Ethanol an Methanol EPA Method 8015 <br /> a 116 Soil Semi-volatile Organic Compounds EPA Method 8270 <br /> 94&95 Soil Organochlorine Pesticides EPA Method 8081 <br /> 4.5 Investigation-Derived Waste Disposal <br /> Drill cuttings and wash water generated during the field investigation will be contained for <br /> disposal in 208-liter (55-gallon) drums, approved by the United Nations for transport of liquid <br /> and solid wastes. The drums will be stored at the site. The drums will be removed from the site <br /> for disposal within 90 days of initiation of the field investigation. <br /> r. <br /> -IMCPFPIICOMMO &COPL2 V21PA.4PJ8W8 835444.2ab.doc <br /> 4-3 <br />