|
1+f
<br /> 4. RESULTS
<br /> •
<br />' 4.1 SITE GEOLOGY AND HYDROGEOLOGY
<br />'F Soils encountered during the drilling of the borings were generally consistent with those
<br /> observed in previous borings at the site The majority of the native soils encountered during
<br /> drilling generally consist of sandy silt, clayey silt, and silty sand down to 62 feet bgs, the
<br />' maximum depth explored Detailed soil descriptions are presented on the boring logs in
<br /> Appendix E
<br />' 4.2 SOIL SAMPLE ANALYTICAL METHODS AND RESULTS
<br /> Selected soil samples were submitted to TestAmenca and analyzed for TPH-g by EPA Method
<br />' 8015B, BTEX by EPA Method 8021B, and MTBE by EPA Method 8260B Analytical results
<br /> are summarized to Table 3 The laboratory analytical reports and chain-of-custody
<br /> documentation are included in Appendix H
<br />' TPH-g was detected at maximum concentrations of 830 mg/kg in EB1 (41-41 5 feet bgs), 5,920
<br /> mg/kg in IPI (35-35 5 feet bgs), 3,950 mg/kg in IP2 (37 5-38 feet bgs), and 1,640 mg/kg in IP3
<br />' (39 5-40 feet bgs) Benzene was detected at maximum concentrations of 5 37 mg/kg in EB1
<br /> (34 5-35 feet bgs), 5 73 mg/kg in IPI (31-31 5 feet bgs), 2 75 mg/kg in IP2 (37 5-38 feet bgs),
<br /> and 4 59 mg/kg 1n IP3 (39 5-40 feet bgs) MTBE was not detected above laboratory reporting
<br />' • limits in any of the soil samples TPH-g and BTEX were not detected in any samples collected
<br /> at or above 215 feet bgs
<br /> Two soil samples were also analyzed for DIPE, TBA, TAME, EDB, ETBE, and 1,2-DCA by
<br /> EPA Method 8260B TAME and 1,2-DCA were detected in one of the samples at concentrations
<br /> of 0 0145 mg/kg and 0 0087 mg/kg, respectively(IP3, 33-33 5 feet bgs)
<br />' Soil samples were also submitted to PRIMA Environmental Laboratories in Sacramento,
<br /> California, composited by the laboratory, and analyzed for aluminum, antimony, arsenic,barium,
<br /> beryllium, cadmium, calcium, chromium (III and VI), cobalt, copper, iron, lead, magnesium,
<br /> manganese, mercury, molybdenum, nickel, potassium, selenium, silver, sodium, thallium,
<br /> tungsten, vanadium, and zinc The results will be submitted under separate cover as part of the
<br />' benchscale study report
<br /> 4.3 GROUNDWATER SAMPLE ANALYTICAL METHODS AND RESULTS
<br /> Groundwater samples were collected from IP1A, IP1B, IP2A, IP2B, and IP3B on 28 September
<br /> 2004 A groundwater sample was not collected from lP3A because it was dry The samples
<br />' were submitted to TestAmenca and analyzed for TPH-g by EPA Method 8015B, BTEX by EPA
<br /> Method 8021B, and MTBE by EPA Method 8260B The groundwater analytical results are
<br /> summarized in Table 2 The laboratory analytical reports and chain-of-custody documentation
<br />' are included in Appendix H
<br /> 1
<br />' G 1Pmjans173942VAMTERIWPUPR12o41[PRtezt doc 9
<br />
|