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AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURES RE: SOIL.BORING SAMPLING SOP-9 During drilling,soil samples for chemical analysis are collected imchles outside rass tubes, d'cameter}• of varying diameters and lar (e.g.,4 or 6 inches long by a spacer tube, are set in an 18-inch long split- Three or four of the selected tubes, plus barrel sampler of the appropriate inside dip-meter. Where possible, the split-barrel sampler is driven its entire length either hydraulically or using a 140-pound drop hammer. The sampler is extracted from v a borehole and the brass tubes, containing the soil samples, are removed. Upon remorimmed and val from aluminum foil the selected brass tubes are ieeither s orr ed samly tp es a e ext uded from the tubes and or 'Teflon" sheets and plas p lass jar}. The samples sealed within other appropriate cleaned sample containers (e.g., g refrigerated for delivery, under strict chain-of- are then hermetically sealed, labeled, and custody,to the analytical laboratory. These procedures minimize the potential for cross- i contamination and vc0sti;ization of volatile organic compounds (VOC) prior to chemical t analysis. One soil sample collected at each sampling interval is analyzed in the field using either a portable p+►otoionization detector (PID), flame ionization detector, organic vapor is analyzer, Catalytic gas detector, or an explosimeterof The drpurpose oocarbonsf i andhedanalysis sampleto to qualitatively determine the presence or absence y be analyzed at the laboratory. The soil plof VOCe is 1eThe PID id in either s then used to measure easuae or plastic bag to allow for some volatilization is ' the concentrations of hydrocarb�ntshe ibQc ng the snatl the depth co espond ngt to recorded on both field notes a sampling point. i Other soil SE are collected to document the sail and/ oest�t5surpfacepma profile als beneath the project site, and estimate the relative permeabllfty ' drilling and sampling equipment are either steam cleaned or washed in solution and doubly rinsed in deionized water prior to use at each site and between boreholes to minimize the potential for cross-contam?nation. ry on the same In the event the soil samples cannot be submitted holida s)analytical sampl soars temporarily day they are collected {e.g:, due to weekends o Y stored until the first opportunity for submittal either an ice in a cooler,such as when in the field, or in a refrigerator at Aegis' office. ATTACHMENTrDP-175EMMBER 1492 1