ARCHIVED REPORTS_SITE CHARACTERIZATION WORK PLAN

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from 5 to 10 feet bgs. Soil samples were not collected from the piezometer borings. Piezometers located along Navy Drive (PS/P-25 through PS/P-27) and the north Time Oil terminal fence line (PS/P-29 and PS/P-30) did not contain petroleum sheen or measureable SPH. 1988: Levine-Fricke excavated several test pits and trenches along Navy Drive in February 1988 for SPPL, in response to gasoline discovered in the soil at the southwest corner of the Time Oil terminal (Levine-Fricke, 1988). The trenches and test pits were excavated to depths of 4 to 8 feet bgs in order to determine if any of the three 10-inch diameter SPPL underground product supply pipelines located on the east side of Navy Drive were leaking. SPH was observed in the test pits and trenches along an approximately 360-foot section of the pipeline easement. Pressure and tracer tests conducted on the buried pipelines did not identify any leaks. Laboratory results for SPH samples collected from trenches SP-2 through SP-4 reported the product was an unweathered (fresh) leaded gasoline product. No SPH was observed at trench SP-1 or SP-2, and no SPH was observed in piezometers PS/P-26 or PS/P-27. Five 12-inch diameter PVC product recovery wells (SP-1 through SP-5) were installed in the A Zone to depths of 6 to 7 feet bgs along the SPPL pipelines at Navy Drive. The wells were completed using drain rock, and were slotted from about 2 feet bgs to the bottom of each well. Time Oil advanced 17 test pits (T-1 through T-17) and installed product recovery trenches and wells (TO/T-1 through TONT-5, TONT-8, TONT-11, and TO/T-12) in the southwest portion of the Time Oil terminal in February and March 1988, in response to the gasoline spill (Time Oil, 1988). The wells were reportedly installed in the A Zone to 10 feet bgs in February 1988 and constructed using 8-inch diameter PVC well screen and casing, except for wells TO/'T-3 and TONT-4, which were constructed using 8-inch diameter metal well screens and casing, with well screens set at 3 to 9 feet bgs. Well TO/T-14 was reportedly constructed of PVC well casing and screen in March 1988, but the well diameter, depth, and screen interval were not reported. Time Oil gauged depth to water and product thickness in wells TO/R-1 through TO/R-6; PS/P26 and PS/P-32; SP-1 through SP-5; and TONT-1 through TONT-5, TONT-8, TONT-11, TONT-12, and TONT-14 in February and/or March 1988. 1992: EMCON advanced soil borings TO/CB-1, TO/CB-2, and TO/CPT-1 in June 1992 to depths of approximately 22, 14, and 49 feet bgs, respectively (EMCON, 1993). Soil samples were collected from TO/CB-1 and TO/CB-2 at approximately 5 feet bgs, and a groundwater sample was collected from TO/CB-1. EMCON installed wells TO/MW-1, TO/WC-1S, and TO/WC-1M in July 1992 using 2-inch diameter PVC well casing and screens. TO/MW-1 and TO/WC-1S were advanced in the A Zone to 15 feet bgs and screened from approximately 5 to 14 feet bgs, and TO/WCAM was advanced in the B Zone to 30.5 feet bgs and screened from approximately 20 to 30 feet bgs. Figure 14 in EMCON's 1993 report shows borings TOB-1 and TOB-2 on the west side of Tank 33006 (Figure 3). Additional information regarding these two soil borings was not found in the documents made available to ETG for review. A product sheen was noted in wells Site Characterization Work Plan,Final, May 18,2012 1007-012.002 2-7