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I C\V V9 A 5 S O C I A T E S I N C . detected in the groundwater sample collected from soil boring SB 1. The January 1998 subsurface investigation results are detailed in ATC's Summary Report for Subsurface Investigation, dated February 4, 1998. In September 1998, ATC supervised the excavation of approximately 70 tons of impacted soil. The soil was transported and disposed of at an appropriate landfill on the same day it was excavated. The excavation was limited on two sides by buildings and overhead lines. Confirmation samples collected from the excavation indicated there was residual contamination ' remaining. Also in September 1998, ATC supervised the advancement of four soil borings around the former excavation area. Three of the borings were completed as groundwater monitoring wells. Analytical data indicated the soil and groundwater at the site is impacted with total petroleum hydrocarbons as stoddard solvents (TPHss). The September 1998 subsurface investigation results are detailed in ATC's Summary Report of Soil Excavation and Additional Subsurface Investigation, dated December 3, 1998. 2.0 METHODS AND PROCEDURES ' To investigate the extent of impacted soil and groundwater at the site, one soil boring was advanced in the vicinity of the former 1,000-gallon UST and one soil boring was advanced M southwest of the site. All field activities were performed in accordance with ATC's Workplan for Additional Subsurface Investigation at Inland Paint, 117 West Harding Way, Stockton, California, dated December 10, 1999. This workplan was approved by PHS/EHD with minor modifications on March 21, 2000. 2.1 GcoprobcO Drilling Activities On March 23s 2000 an ATC geologist supervised the advancement of one angle soil boring, 1 SB2A, to approximately 32 feet below ground surface (bgs). A site plan with the soil boring location is shown on Figure 2. V&W Drilling, California License C57 720904, advanced the boring using a truck mounted GeoprobeO narrow diameter rig employing direct -push ' technology. The boring was advanced at a thirty degree angle from the vertical, directly under the on-site building, south of the former UST location. Soil samples were collected from boring S132A at five-foot intervals in acetate sampling tubes and were described according to the Unified Soil Classification System. Descriptions of soil types encountered and sample collection intervals are presented on the boring log contained in Appendix A. 1 222 Soil Sampling and Analysis Each soil sample was field screened with a Flame Ionization Detector (FID) for the presence of ' volatile organic compounds. Sample tubes were then sealed at each end using Teflon tape and plastic end caps, labeled, and placed on ice. w:V 72951reportslsumiii.doc 2