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Mr. M. Phillip Cardoza AUG 3 1 T-20 <br /> Cardoza Properties <br /> May 15, 1990 ENVIRONMENTAL HEALTH <br /> File: J-2062-1 PERMIT/S7," tS <br /> Page 2 <br /> The attached Plate No . 1 illustrate the locations of our <br /> subsurface borings. <br /> A total of five (5) soil samples were retrieved, sealed, stored <br /> under refrigeration, and delivered to Brown & Caldwell Analytical <br /> (BCA) Laboratory in Emeryville for chemical testing. <br /> The results of BCA's analysis are presented in the attached <br /> analytical report. The following Table No. 1 describes the <br /> location and depth of soil samples. <br /> Table No. 1 <br /> Location and Depth of Samples <br /> BCA DCM/loyal Boring Depth Below <br /> Log No. Sample No. No. Existing Grade (ft. ) <br /> 03-801-1 2-3 c B-2 6. 0 - 6. 5 <br /> 03-801-2 2-3 b B-2 5. 5 - 6. 0 <br /> 03-801-3 4-4 B-4 11. 0 - 11. 5 <br /> 03-801-4 5-1 B-5 6. 0 - 6. 5 <br /> 03-801-5 6-1 B-6 6 . 0 - 6. 5 <br /> 03-801-6 7-1 B-7 6. 0 - 6. 5 <br /> At the time of our subsurface drilling, we detected (smelled) no <br /> evidence of gasoline within soils or groundwater at boring <br /> locations B-1, B-2 or B-3 (drilled to maximum depths of 21. 5 <br /> feet) . Soil samples were taken at B-2 at a depth of 5.5 to 6. 5 <br /> feet (this boring location is the most distant from the site of <br /> the pipeline break ) for chemical testing in order to provide a <br /> quality control check on the laboratory. As can be seen from the <br /> BCA analytical report, all constitutes of gasoline were below <br /> detection limits for this sample. At boring location B-4 we <br /> detected no evidence of gasoline within soils in the upper 9 feet <br /> of the boring. However, when we first encountered groundwater at <br /> about 9 feet we detected gasoline within the groundwater. Boring <br /> B-4 was then terminated at a depth of 11. 5 feet and a saturated <br /> soil sample retrieved below the water table for chemical testing <br /> at a depth of 11. 0 to 11. 5 feet. Results of testing on this <br /> sample indicate trace levels of Ethylbenzene (0. 1 mg/kg) and <br /> Total Xylene Isomers (0. 5 mg/kg) with all other constituents <br /> below detection limits. Borings B-5, B-6 and B-7 were then <br /> drilled between B-4 and the pipeline break site. These borings <br /> were drilled to maximum depths of 6. 5 feet to stay above ground- <br /> water with soil samples retrieved from each boring at a depth of <br /> 6. 0 to 6. 5 feet. <br /> DCM/1oVol Engineering <br />