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12 March 2003 <br /> AGE-NC Protect No 96-0236 <br /> Page 3 of 5 <br /> 3.0. FINDINGS <br /> Laboratory analysis of six grab ground water samples detected TPH-d in five samples,various BTEX <br /> constituents were detected in three samples, fuel oxygenated compounds were not detected in any <br /> grab ground water samples <br /> 3 1 FIELD EVIDENCE OF HYDROCARBON-IMPACTED GROUND WATER <br /> No petroleum hydrocarbon odors or discoloration were noted in the grab ground water samples <br /> collected from probe borings P36, P37 and P38 Boring logs are contained in Appendix A <br /> 3 2 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLES <br /> A total of six grab ground water samples were submitted to CAL and MAI for analysis of TPH-g, <br /> TPH-d, BTEX, 1,2-DCA, EDB and fuel oxygenated compounds Utilizing EPA method 8015M, <br /> • TPH-d was detected in grab ground water samples collected from all three probe borings at <br /> concentrations ranging between 50 micrograms per liter(µg/1)and 1,700(µg/1),however,both CAL <br /> and MAI laboratories reported the sample chromatograms to have non-diesel patterns (no <br /> recognizable pattern) and a single, unknown isolated peak Based on further laboratory review by <br /> both CAL and MAI of the TPH-d sample chromatograms, the laboratories both indicated to AGE <br /> that (1) the TPH-d detections did not have typical diesel characteristics, (2)was probably"not"the <br /> result of diesel fuel,and(3)that the single large peaks detected in each sample chromatogram were <br /> unknown, but possibly the result of some type of plastic or pesticide (Appendix B) <br /> Utilizing E PA In ethod 8 020, B TEX c onstituents w ere d etected i n grab g round w ater s amples <br /> collected from P-37 (45 to 49 feet) and P-38 (21 to 25 feet and 46 to 50 feet) at concentrations <br /> ranging between 0 56 µg/1 and 1 µg/1, benzene and MTBE were not detected in any of the analyzed <br /> grab ground water samples <br /> Utilizing E PA In ethod 8260, none o f t he o xygenated c ompounds o r 1 ,2-DCA and E DB w ere <br /> detected,however,due to a laboratory over-sight,grab water samples collected from P-37 were not <br /> analyzed for the EPA Method 8260 constituents Analytical results of grab ground water samples <br /> are summarized in Table 1 The laboratory report(MAI Work Order 0215064 and CAL Reference <br /> No 5125) and chain-of-custody are included in Appendix C <br /> Advanced GcoEnvironmental,Inc <br />