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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report Soil samples were collected in 4-inch by 2-inch diameter brass sleeves capped with teflon-lined PVC end caps by Mike Rauser with Advanced GeoEnvironmental, Inc of Stockton, California under the supervision of Letitia Briggs of the SJCPHS The soil samples were submitted for analyses, under proper chain-of-custody protocol, to the on- site mobile laboratory supplied by Baseline On-Site Analysts of Huntington Beach, California, a State-Certified mobile laboratory The locations of the UST/Excavation bottom samples are presented in Figure 3 r 8.2.2 UST No. 8 Sampling Soil samples collected from soil bonngs B-3 and SB-3 were used as confirmation for UST No S per the revised workplan dated March 18, 1999, approved by Letitia Briggs ' with SJCPHS Boring B-3 was advanced off the northwest end of the UST with samples collected at approximate 5 foot intervals to a total depth 20 feet bgs Boring SB-3 was a slant-boring angled southeast to northwest, directly beneath the east end of the UST with samples collected at approximate 5 foot intervals to a total of 15 feet bgs (15 foot sample approximately 4 feet below the UST invert) ' The locations of the soil borings are presented in Figure 3 and a cross-section of the slant- boring(SB-3) is presented in Figure 4 8.2.3 Stockpile Samples One (1) sample (SP-1) was collected from the one (1) soil stockpile that was generated during the exposure of UST No 4 The soil sample was collected in a 4-inch by 2-inch diameter brass sleeve capped with teflon-lined PVC end caps by Mike Rauser with Advanced GeoEnvironmental under the supervision of Letitia Briggs of the SJCPHS The samples were submitted to the on-SITE mobile laboratory under proper chain-of- custody protocol for analyses 8.3 Site Subsurface Soil Description and Observations The upper 5 feet of soil encountered at the SITE consisted of a dark brown to black, moist, sandy ' or silty clay A medium dense, light brown to brown, moist to wet, fine to medium grained, sand or silty sand was observed from 5 feet bgs to 60 feet bgs Groundwater was encountered between approximately 40-45 feet bgs Boring logs for all six (6)bonngs (HA-1, HA-2, B-1, 13- 2, B-3, and SB-3) are presented in Appendix D A noticeable hydrocarbon odor was detected when drilling borings B-1 and B-2 from 10 to 60 feet bgs Photoionization detector(PID) readings exceeding 1,999 parts per million (ppm) were also recorded for soil samples collected between 10 to 60 feet bgs in the same borings ' 5 �