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:2 <br /> V <br /> Results of Initial Investigation and Work Plan <br /> ..� ARCO Service S`ation No. 760, Lodi, CaliforniaS 380448-48-4 <br /> ia December 18, 1990 <br /> � <br /> Bonn and iI am lin <br /> Applied GeoSystems was at the site between May 30 and.lune 1. 1990, to observe Wayne <br /> Drilling Company of Uncoln,California,drill two 8-inch diameter soil borings(B-1 and B-3) <br /> and one 7-inch diameter soil boring(B-2)near the former waste-oil tank cavity. Boring B-2 <br /> was drilled through pea gravel in the center of the former waste-oil tank cavity inside a 12- <br /> inch diameter auger which limited the borin °diameter to 7 inchesThe a c <br /> g . P�rbximai <br /> locations of the soil borings along with other site features are shown on PIate P-2. <br /> On October 5, 8 and 9, 1990, we observed Wayne Drilling Company drill five additional fl- <br /> inch diameter soil borings (8-4 through B-8). The locations of the borings were selected <br /> using ARCO's Preliminary Tank Replacement Assessment guidelines. Boring B-4 was <br /> drilled approximately 2-1/2 feet from the not3h edge of the tank area near the fill ends of <br /> k the three product tanks; borings B-5 and B-6 were drilled just west and east of the tank <br /> Feld, respectively. Borings B-7 and B-8 were drilled in the area proposed as the new tank <br /> cavity. The locations of the soil borings are shown on Plate P-2. <br /> t$ <br /> Soil samples were collected during drilling at approximately 5-foot intervals and were <br /> classified according to the Unified Soil Classificatior.System (Plate P-3). Descriptions of <br /> materials encountered are presented in the Logs of Borings(Plates P-4 through P-20). The <br /> materials in the eight soil borings consistrt!predominately of sandy silt and silt with minor <br /> amounts of clay. The Logs of Borings drilled near the gasoline tank cavity show fine- to <br /> coarse-grained sand and a trace nnimAy,q :..{fine-grained gravel. <br /> d <br /> The geologist used a photoionization detector (PID) to evaluate the soil samples for <br /> hydrocarbon vapors. PID readings are also included on the Logs of Borings. The geologist <br /> noted positive PID readings and .ected subjective evidence of gasoline hydrocarbons such <br /> AVAR1ied GeOSystems ----� <br />