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INTERNATIONAL TECHNOLOGY CORPORATION 2.2.2 Verification Soil Sampling - Pipelines Soil samples were collected at one per 20 feet of piping as shown in Appendix D. Samples were collected using a split spoon sampler with inserted brass tubes and analyzed by test methods previously discussed (Section 2.1.2). Samples PL07 and PL08 were collected prior to over excavation efforts, and samples PL12 and PL13 were collected in respective locations following over excavation. Samples were delivered under chain of custody control to Med Tox Associates, Inc. for analysis. 2.2.3 Soil Stockpile Sampling - Pipeline Soils excavated during removal of the pipelines on November 4, 1991 were stockpiled for future disposal. On November 5, 1991, three soil samples were collected from random locations (Appendix D) by driving the sampler directly into the stockpile. Samples were analyzed by Med Tox Associates, Inc. using the same methods listed in Section 2.1.2. to comply with self-certification procedures, two discreet soil samples were collected to be analyzed by B & C Analytical for Title 22, LC50 Fish Toxicity Test (96 hr.) and by Med Tox for STLC metals (wet scan) by EPA method 6010. 2.2.4 Soil Sample Analyses - Pipeline and Pipeline Stockpile Upon analysis, samples (PL01 - PL06) from beneath the pipelines revealed no detectable petroleum hydrocarbons. Analysis of samples PL07 and PL08 collected prior to over excavation revealed detectable petroleum hydrocarbons, however, samples P112 and PL13, collected in the same location subsequent to over excavation, revealed no detectable levels of petroleum hydrocarbons (Table 2A). ,,fee r p Stockpile soil samples revealed low concentrations of petroleum hydrocarbons in 2 of the 3 samples. All metals were below TTLC and STLC levels. The fish toxicity levels were >750 mg/L (Table 2B). Based on analytical results, the stockpile was determined to be non- hazardous. 2.2.5 Pipeline Stockpile Disposal The soils were transported from the site on November 18, 1991 by Conrad & Sons Trucking (under subcontract with Paradiso Construction) to the BFI landfill in Livermore, California along with the soils from the UST excavation. Copies of all non-hazardous waste manifests are included in Appendix E. 2.2.6 Piping Excavation Backfill Backfill was accomplished as discussed in Section 2.1.6 above. MW01-06.92 UST/0054MER 5