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Febi uary 6 1997 Page 5 Product Piping On December 11, 1996, two sets of underground product piping remained in place in the vicinity of the removed and abandoned USTs An isolated 1-112 inch diameter steel pipe was noted to the exit the area of the fuel tanks from the southeast corner of the fuel tank complex, trending toward the southeast The isolated southeast trending= pipe was excavated to its termination, approximately 15 feet fi oEn the UST excavation (Figure 2) A pair of 1-112 inch diameter steel pipes were noted to exit from the western edge of the UST excavation, trending west (Figure 2) Because this piping trended directly beneath a tree, the piping was abandoned in place by filling the pipes with Portland cement Prior to the abandonment of this piping, the length of the piping was measured by inserting a tape measure into the exposed ends of the two pipes The piping was determined to continue toward the west for approximately 10 feet prior to reaching an unidentified termination The requirement for soil sample collection from the locations of the removed and abandoned piping was waived by the SJCEHD GROUNDWATER MONITORING WELL INSTALLATION On December 7, 1996, one groundwater morutoring well, designated U-4, was installed between the locations of the two fuel tanks removed on November 26, 1996 (Figure 2) The location of this well was selected to allow the collection of soil and groundwater samples beneath the location of the removed USTs The boring for Well U-4 was dnlled to a depth of 21-1/2 feet bgs Groundwater was first encountered at a depth of 10 feet bgs on December 7, 1996 Well U-4 was constructed from 2-inch diameter schedule 40 PVC casing, installed to a depth of 20 feet bgs The well was completed with 0 020-inch factory-slotted screen placed between the depths of 5 feet and 20 feet bgs On December 23, 1996, the well head was surveyed by a California state licensed surveyor for northings eastings and elevations - Field and laboratory procedures which describe soil sampling, well construction, well development, and groundwater sampling procedures are presented as Attachment A The bonng log and well construction detail for Well U-4, well permit, field data sheets, and well survey data are presented as Attachment B Soil samples were collected at depths of S feet, 10 feet, 15 feet, and 20 feet bgs These soil samples were submitted to a state-certified analytical laboratory, and analyzed for the presence of total purgeable petroleum hydrocarbons calculated as gasoline (TPPH-g), benzene, toluene, ethylbenzene and xylenes (BTEX compounds), and total lead Soil i 1100971 WREPORT DTIC