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TIWC Soil samples were taken from the cuttings on the auger. They were immediately sealed in glass and put on ice. The auger was then cleaned at the onsite truck wash with hot soapy water between each hole. 8.0 SAMPLING AND ANALYSIS Soil samples were collected for offsite analysis from the side walls and from the soil in the backhoe bucket as it was excavated during the initial site investigation. During the second'round of sampling, soil samples were taken from the auger. They were immediately sealed in one liter glass jars and put on "ice" in an ice chest. A complete vertical composite of the water was obtained using a thief made from PVC pipe. These samples were sealed in glass, labeled and placed on ice. A chain of custody was used and the samples were hand delivered to LeC Institute of Water Research where they were tested in accordance with approved EPA procedures. Total Petroleum Hydrocarbons were determined using Method 418.1 an Infrared Spectroscopy technique. BTEX (benzene, toluene, ethyl benzene and xylene) were determined using Method 5030 for preparation of the sample and Method 8020 for analysis. Results are attached. LCUIWR samples X9357, 9358, 9359, 9360, 9361, 936 9363 are the soil samples obtained from the backhoe excavation at varying depths. LCUIWR samples X9683, 9684, 9685, 9686, 9687, 9688, 9689, & 9690 are the water from each of the auger holes taken on 3/17/89. Soil samples taken from a depth of 15 feet from each of the auger holes were tested. Hole #2 was analyzed for soil BTEX at a depth of 5', 10', 15~, 20'. These results are reported as LCUIWR sample #'s X9672, 9673, 9674, 9675, 9676, 9677, 9678, 9679, 9680, 9681, & 9682. Total Petroleum Hydrocarbons have not been run as the level of contamination from BTEX is high enough alone to warrant remedial action. Quality control results are reported with each set of analyses. 9.0 EXTENT OF CONTAMINATION The extent of contamination has been assessed through onsite drilling, testing and sampling and offsite testing. The graphical analysis of the analytical data is shown in the attached figures 3 and 4. Three types of contamination have been addressed. 1) The presence of gasoline in the soil interstitial spaces has been measured using a J-W Combustible Gas Detector Model CSSP meter. This PID meter is designed to measure explosive limits of gasoline and to measure BTEX at the ppm levels. Measurements were made every 5 feet in the hole between augering. Results are documented in attached Table 4. Thesp results have been graphically analyzed in Figure 2. 2) Figure 3 represents an estimation of how far the gasoline contamination has migrated in the soil. The direction of movement needs 118LOO"" Road . Georoetown, Tex.. 18828 . (512)2592259 . {5 t2P5HØ2-4