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GEORGE SCHULER INC. 1705 N. Broadway, Stockton, California Remedial Excavation Report 1.0 PROJECT IDENTIFICATION This project involved the removal of oil contaminated soil caused by an underground storage tank release at the property at 1705 N. Broadway in Stockton, California (Figure 1). The remedial excavation work included confirmation sampling of the floor and sidewalls of the excavation. 1.1 Site Description and History On August 27, 1992 SEMCO, under permit, removed two (2) underground gasoline storage tanks along with the associated piping. Soil samples taken at 15 feet in depth disclosed high concentrations of gasoline, Benzene, Toluene, Xylenes, and Ethyl Benzene(BTX&E). '. A Re-Excavation Work Plan, dated October 7, 1992, was submitted by SEMCO to the San Joaquin County Environmental Health Department. The work plan proposed an excavation 25 by 25 feet wide to a maximum depth of 30 feet and logged by WHF Environmental Consultants' registered geologist. 2.0 SCOPE OF WORK On October 27, 1992 SEMCO re-excavated the former underground tank faciliry at George Schuler's. WHF screened the soil with a portable PID and logged the excavaxion. l Highly contaminated soils were encountered during the excavation but appeared to beu� I intermittent and layered instead of decreasing in concentration consistently with depth. At a depth of 30 feet gasoline odor was still present in the soil from the floor and sidewalls of the excavation. The excavation was terminated at this depth and samples were taken, under the direction of the local regulatory agent. The final lateral dimensions of the excavation were 21 by 17.5 feet (Figure 2). 'Soil samples taken, for laboratory analysis, of the side walls at varying depths were non detect for gasoline and BTX&E. The floor sample taken at 30 feet in depth disclosed concentrations of gasoline along with BTX(Table 1 & Appendix A). I