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Boring B1 was advanced to a total depth of 25 feet bgs and approximately 1 foot east of <br /> UST 'B" FID readings (refer to Appendix A-Soil Boring Logs) at B1 indicated that <br /> petroleum hydrocarbons were present in the soil, therefore this boring was advanced <br /> below the proposed 20 feet bgs to assist in evaluating the vertical extent of impacted soil <br /> Boring B2 was advanced to a total depth of 10 feet bgs and was located approximately 14 <br /> feet south of B1 A subsurface obstruction at 12 feet bgs prevented the advancement of <br /> the drill auger (refusal), therefore this boring was not advanced to the proposed 20 feet <br /> bgs. <br /> Boring B3 was advanced a total depth of 17 feet bgs and was located approximately 1 <br /> foot east of UST "A". The dnll auger encountered an obstruction at 12 feet bgs that <br /> deflected the auger to an angle, the auger was then advanced an additional 5 feet, <br /> however, due to the angle of deflection, the proposed depth of 20 feet bgs was not <br /> attained. <br /> Boring B4 was advanced to a total depth of 10 feet bgs B4 was located approximately 1 <br /> foot north of UST "A" and 1 foot west of the product fill line. <br /> San Joaquin County Public Health Services-Environmental Health Division (PHS/EHD) <br /> representative Mary Meays was present to inspect "backfilling" of the bore holes The <br /> backfill material consisted of Type I & Type II Portland Cement (ASTM Designation <br /> K084023 RPT 9 <br />