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K I J 1111:11151Jill 1 INTRODUCTION In 1985, Atchison Topeka and Santa Fe Railway Company (Santa 3?e) purchased some property in Stockten with the intention of building an interchange track. It was discovered that the new property line bisected an underground vault and two storage tanks. In December., 1987, Cal Tank Testing excavated soil from around the tanks in order to remove them. In the process of removing the tanks, another tank was discovered. The tanks had contained heavy fuel oils which presumably were used to fire boilers at a Del Monte Cannery facility which had previously occupied the adjacent site. During tank removal, it was found that two of the tanks had leaked. Pooled product at the bottom of the excavations had to be removed. Soil from the excavation was used to absorb the: product. This soil was then removed and hauled to a waste management facility. Soil samples were taken at locations 2 feet below the base of each tank before the excavation was backfilled, compacted and graded. Sg r f those samples were contaminated with petroleum hydrocarbons. However no volatile r 2, cs, PCB's, benzgne, o uene. xylene or ethylbenzene were found (See Appendix) . SITE DESCRIPTION The site is located on the east side of the Southern Pacific track near the intersection of Union Street and Scotts Avenue in Stockton (Figure 1) . Access to the site will be through the Valley Welding Supply yard at 1033 E. Scotts Avenue, and through the adjacent property of Lanny R. Williams. SCOPE OF WORK The scope of this work is to determine the vertical and horizontal extent of any contamination that may have remained following removal of the tanks. This investigation will involve 10 borings below and adjacent to the backfill material (Figure 2) . Given the nature of the contaminants, it is unlikely that lateral movement of the contaminants has been significant unless the products have reached the groundwater. When the contaminants reach the groundwater, lateral movement will be increased because the vertical component of movement is eliminated due to the lower density of the petroleum contaminants. Groundwater was not encountered during tank removal observations, and is not expected to be encountered above about 30 feet. Vertical movement of the contaminants is possible due to gravitational potential. However, overall movement of the contaminants should be limited by their high viscosity and by the high clay content soils in the area.