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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report . 7.2 In-Place UST Abandonment Upon submission and approval of a revised workplan dated March 18, 1999, and the receipt of analytical data from soil borings B-3 and SB-3 as requested by Letitia Briggs,permission was granted to abandon UST No 8 in-place On April 12 and 13, 1999, UST no 8 was abandoned in-place by filling entire UST with slurry and capping fill port with concrete 8.0 DRILLING AND SOIL SAMPLING Drilling services were provided by West Hazmat Drilling, Inc (WED) of Rancho Cordova, California Drilling was accomplished using a CME 75 or a Mobile B-51 drilling rig equipped with 8-inch or 10-inch diameter hollow stem augers Sampling was performed using a 2-inch (inside) diameter split-barrel sampler loaded with three (3) 2-inch by 6-inch brass sleeves Soil samples were collected under the supervision of Inspector Lon Duncan with SJCPHS Field ' procedures used during the investigation are presented in Appendix A From March 17 through 19, 1999, four (4) soil borings (B-1, B-2, B-3, and SB-3) were advanced at the SITE Soil boring B-1 was continuously cored to a depth of approximately 60 feet bgs in the area of removed UST No 3 (Areal) Soil boring B-2 was advanced to a depth of approximately 60 feet bgs in the proximity of replaced UST's No 1 and No 2 (Area 2) In Area 3, soil boring B-3 was advanced to a depth of approximately 20 feet bgs and boring SB-3 (slant boring) was advanced beneath existing UST No 8 to a depth of approximately 15 feet bgs Soil Ile samples were collected from each boring at approximate 5-foot intervals for a total of 30 samples Soil boring B 1 was converted into groundwater/vapor well MW-1 and boring B2 was converted into groundwater monitoring well MW-2 (Figure 3) 8.1 Hand Auger Sampling ' On March 16, 1999,two (2) confirmation soil borings(HA-1 and HA-2) were each advanced by hand angering to a depth of approximately 15 feet below ground surface (bgs) in Area 1 along the product piping where diesel contamination had previously been detected (Figure 3) Soil samples were collected at 5-foot intervals for a total of six (6) samples Samples were collected in 2-inch by 4-inch brass sleeves sealed with Teflon lined Polyvinyl Chloride (PVC) end caps using a slide hammer assembly The hand auger and slide hammer assembly were decontaminated prior to each sampling interval 8.2 UST Soil Sampling 8.2.1 Waste Oil UST No. 4 Sampling On March 16, 1999 soil samples were collected from beneath the removed waste oil UST No 4 Two (2) soil samples (WO-N and WO-S) were collected approximately 2 feet below the invert on each end of the UST for a total depth of approximately nine (9) feet ' bgs One (1) soil sample (PL-1) was collected approximately 2 feet into the sidewall directly below fill-port pipe, at a depth of approximately 6 feet bgs The bottom samples were collected from the bucket of a backhoe and the piping sample was collected using a hand auger and slide hammer assembly i I 4