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' UNIONICE CE COP✓1PANY 1320 Weber Street, .Stockton, California Phase III Site Assessment - Report of Findings ' Phase IV Additional Remedial Proposal 1 0 PROJECT HISTORY In a report submitted to San Joaquin County in rune of 1990, the general outline of ' contamination resulting from a LUST release on the property was delineated During the month of February, 1991, approximately 2,000 cubic yards of contaminated ' soils were excavated The limits of the excavation were guided by exploratory trench- tng and sidewall sampling Because definition of the limits of the contaminated soils was complicated by soil discoloration, due to the presence of peat which was found in native soil and wood debns it old backfill material, a large number of srdewall samples had to be taken to define the contamination limits 2.0 SCOPE & SUMMARY OF PRESENT WORK The present phase of work was designed primarily to explore the extent of the contam- ination plume which extended to the southeast of the previous excavations This area of the plume was not removed because of the presence of a sewer line, which runs north to south in the area In addition, the present phase of work was intended to test the E effectiveness of the excavations in removing the contamination in other areas of the plume The work was earned out between March 25 and 28, 1992 A total of eight (8) soil borings were drilled to a depth just above the groundwater level by Osterberg & Stewart, licensed dnlling contractors, of Modesto, lCaliforriia The borings were dulled using a 7 25 inch diameter hollow stem continuous flight auger and the soil was cored continuously, using a wireline coring device Samples were collected in 2 Vz inch diameter brass sleeves and the soil was Sampled at 2 5 foot intervals Detailed sampling protocol description is outlinea in Appendix C A detailed stratigraphic log, listing sediment type and description, was kept for each bonng