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I a Frank C. Alegre Trucking, Inc. Lodi, California January 25, 1991 4. IDENTIFYING THE CONTAMINANT FLUKE i 4. 1. Phase I Site Assessment Regarding information on the site characterization and results of previous study, the reader should refer to Condor Earth Technologies, Inc. 's September 28, 1990 "Problem Assessment Report" . 4. 2. Phase II Investigation 4. 2. 1 . Location of Borings Three vertical borings were augered by Spectrum Exploration, Inc. at the tank site. Th three borings were used for monitoring well installation for the purpose of taking ground water samples (Figure 4. 1) .' The soil borings/monitoring wells are identified as AM-2, AM-2 and AM-3. 4.2.2. Depth of Borings The vertical depth angered for ',lthe three borings are as follows: AM-1 55' , AM-2 55' and; AM-3 55' . As a result of on-site evaluations indicating 'penetration of the ground water had been reached at the depth of +_45` in each boring, augering was terminated at the depth of 10' below the water table. 4. 2. 3. Soil Sample Procedure The augering was performed w' th!: a truck-mounted auger rid using 8" hollow stem augers. The augers acted as continuously advancing steel casings preventing test holes from caving above the levels to be sampled. Soil samples were obtained by lowering a split spoon sampler inside the hollow stem auger and driving it into undisturbed soils. The sampler was equipped with brass liner'' tub_s designed to receive intact soil specimens. The sampler was hand cleaned with dilute solution of TSP and tap water';prior to each sampling action. Clean brass liners wereplaced inside the sampler. Steam cleaning of the augers Was also performed prior to entering the site and clean lead',',augers were used in test holes to prevent cross contamination. The auger crew consisted of a driller and a helper. Field exploration was supervised by the Mr, Thomas W. Ladd, California Registered Geologist #3508, whu was responsible } for preparing the recording of field conditions, soil sample handling and preservation, and control of''the field equipment cleaning process. The ends of the tube samples then capped with pressure fitted plastic caps, sealed with adhesive '"tape and labeled. The samples were placed in an iced insulated chest packed for preservation for transported to GeoAnalytical E Laboratories for analye.is. 4 . 2. 4. Sample Description Sample lithologic descriptions snd log's have been prepared for each boring and are presented as Attachment C-30t lue Consulting Services Page - 8