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3.0 RESULTS AND DISCUSSION <br /> 1 This section presents the results of the first quarter 2000 monitoring event <br /> 3 1 Data Validation <br />' The laboratory report provided by STL was reviewed by Dames & Moore's data validation <br /> group in order to insure that the reported data results are accurate Results of the Dames & <br /> Moore QA/QC of the data are included in Appendix B All data were determined to be <br /> acceptable for use <br /> 3 2 Groundwater Levels <br /> Groundwater was measured to be approximately 37 feet below ground surface on February <br /> 28, 2000 Groundwater levels decreased approximately two feet between December 1999 <br /> and February 2000 The direction of groundwater flow in February 200 was variable, with <br />' the strongest component oriented towards the north-northeast, as illustrated in Figure 3 <br /> Variations in the direction of groundwater flow during the 12-year period are presented in <br /> Figure 3 Flow directions appear to have shifted from west in 1987 to the east in 1995, and <br /> are noA generally in the direction of north-northeast to northeast <br /> 3.3 TPH-D in Groundwater <br /> TPH-D groundwater results for samples collected on February 28, 2000 have been <br /> compiled with previous data in Table 3 Groundwater samples from wells DMW-3 (53 <br /> ,ug/L), DMW-6 (1 10 /.rg/L) and DMW-7 (87 /rg/L) contain what appears to be weathered <br /> diesel reported as unknown hydrocarbon A single unknown peak which does not <br /> correspond to diesel fuel has been reported as unknown hydrocarbons in samples collected <br /> from wells DMW-2 (53 /jg/L) and DMW-4 (55 pg/L) Hydrocarbons were not reported for <br /> samples collected from wells DMW-1 and DMW-5 <br />' Review of historical TPH-D data indicates that maximum TPH concentration reported since <br /> 1987 was for the sampling event in September 1999 Prior to the installation of DMW-6 <br /> and DMW-7 in December 1998, the only other reported TPH concentration was 180 Ng/I at <br /> DMW-4 <br /> The weathered diesel reported as unknown hydrocarbon has been consistently detected <br /> during the six sampling events conducted at DMW-6 and DMW-7 since December 1998 <br /> These %,,ells are constructed so that representative water samples can be collected directly at <br />' Dames& Moore 5 !1AFP\REP0RT\Q1-2000 DOC <br />