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KLEINFELDER <br /> 3 FIELD INVESTIGATION <br /> 3 1 GEOPHYSICAL SURVEY <br /> ' Because actual locations of the tanks, fuel lines and utility lines were not known, a <br /> geophysical survey was performed to locate these structures. <br /> On September 19, 1991, Spectrum Environmental Sciences, Inc (Spectrum E S I.) <br /> ' conducted a geophysical survey of the two tank sites Spectrum E S I assessed the actual <br /> sizes and locations of the two known tanks using a probe inserted into the tanks' fill ports. <br /> While cleaning an access route to the Fill port of T2, the fill port of an additional tank (T3) <br /> was uncovered. Tank T3 was sized and located in a sinular manner to tanks T1 and T2. T1 <br /> was assessed as a 6,000 gallon tank, while both T2 and T3 were assessed as 750 gallon <br /> ' tanks While on site, Spectrum E S I. used a combination of electromagnetic and <br /> conductivity tools to locate underground utilities in the vicinity of the tanks Copies of the <br /> maps provided by Spectrum E S.I are included in Appendix A <br /> 3 2 DRILLING OF SOIL BORINGS <br /> ' Based on the findings of the geophysical survey, four borings were drilled at the two tank <br /> sites at the locations shown on Plates 3 and 4 At Site #1, borings B-3 and B-4 were drilled <br /> vertically to a depth of 25 feet on the east and west ends of tank T1 Two shallow borings <br /> ' were proposed near the previous pump island location for tank T1, however, a storm drain <br /> pipe and the water main to the hospital were in close proximity to the proposed boring <br /> ' locations and may have been damaged while drilling Consequently, borings near the <br /> previous pump island location were not drilled <br /> ' At Site #2, because of obstructions (utilities and buildings), one angle boring was drilled <br /> ' beneath each tank (T2 and 73) The borings (B-1 and B-2) were angled such that soil <br /> samples were collected at a depth of approximately 8 feet at the east end of each tank, to a <br /> depth of 18 feet at the west end of each tank (Plate 5--Angle Soil Boring Cross-Section <br /> ' Underground Tanks T2, T3) <br /> Soil borings were advanced using a truck-mounted drill rig equipped with 6-inch hollow <br /> stem augers During drilling, an experienced environmental geologist classified the soil, <br /> FR25-91-29 Page 4 of 11 <br /> Copyright 1991 Kleinfelder, Inc <br />