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U-Haul#709-50 Additional Site Charactenzatlon Blaes EEnvironnsenlal Blaen Environmental collected discrete soil samples collected at various depth intervals within each borehole (depending on previous data, field results, field conditions and depth of sampling) Soil samples for laboratory analysis were properly contained, IabeIed, and stored pending pickup by a state-certified analytical laboratory Submittal of samples to the analytical laboratory followed strict chain-of-custody protocol The soil sample depths, intervals, names, times, and soil descriptions are presented on the logs of soil borings included as Appendix B A listing of the soil samples is included on Table 4 Rationale for the borehole locations and soil sample intervals is described below r 1) Borehole location DP-1 and DP-2 were located nearest the area of soil boring B-7, which indicated the highest concentrations of petroleum hydrocarbons in soil (Appendix A) Previous results of soil samples collected from the product piping trench also indicated the detection of hydrocarbons Based on previous results (ETS, 1991 and Applied, 1993, Appendix A), it appeared that one release area included the western dispenser island Borehole DPA reached refusal at approximately 87 feet bgs using direct-push Borehole ' DP-2 reached refusal at approximately 83 feet using direct-push and was further advanced to approximately 110 feet bgs using the cone-penetrometer rig Soil sampling at boreholes DP-1 and DP-2 was limited in the upper 70 feet due to the proximity of boring B-7, which has soil sample analytical results from 10 to 70 feet bgs 2) Borehole location DP-3 was located approximately 20 feet northeast of DP-1/DP-2 (Figure ' 4) Used in conjunction with data from MW-I, analytical results of soil samples from this borehole defined the lateral extent of impacted soil Borehole DP-3 was advanced to approximately 1 I0 feet bgs using direct-push for the first 50 feet and cone-penetrometer from 50 to 110 feet bgs 3) Borehole location DP-4 was located approximately 25 feet south of DP-l/DP-2 (Figure 4 Used in conjunction with data from MW-4, analytical results of soil samples from this borehole further defined the lateral degree of impacted soil Borehole DP-4 was advanced to approximately 125 feet bgs using the cone-penetrometer rig 4) Borehole location DP-5 was located approximately 28 feet northwest of DP-I/DP-2 (Figure 4) Data collected from this borehole further defined the extent and degree of impacted soil associated with the product piping trench and the USTs Borehole DP-5 was advanced to 9 h