Laserfiche WebLink
• Groundwater Gradient <br /> Groundwater elevations were plotted to a known datum to prepare a groundwater contour map The <br /> groundwater flow direction was toward the north-northeast at sampling time, and a flow gradient of 0 002 <br /> was calculated Histonc groundwater flow trends typically vary from north-northeasterly to north- <br /> northwesterly Groundwater levels rose over the last quarter and are attributed to winter rain recharge <br /> Chemical Analysis and Results <br /> Chromalab Inc tested the groundwater samples using EPA Methods for Total Petroleum Hydrocarbons <br /> as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene (BTEX) and fuel oxygenates <br /> including Methyl-tert-butyl-ether (MTBE) The analytical reports are attached, and the results are listed <br /> below in Table 2 <br /> Table 2 Groundwater Chemical Data <br /> Well No Date TPHG Kero B T E X Fuel Ox <br /> ug/I <br /> MW-1 8125197 NO NA NO NO NO ND NO <br /> MW-1 12/11/97 NO 170 ND NO NO NO NO <br /> MW-2 8/25/97 NO NA NO NO NO NO NO <br /> MW-2 12/11/97 NO 210 NO NO NO NO NO <br /> •� MW-3 8/25/97 ND NA NO NO ND NO NO <br /> MW-3 12/11/97 NO NO NO NO NO NO ND <br /> Blank 12/11/97 NO NO NO NO NO ND NO <br /> NO -None detected NA-Not Analyzed ug/1 - micrograms per liter <br /> Fuel Ox - Fuel Oxygenates by Method 8260 <br /> Kero-Kerosene, but does not match the Kerosene standard <br /> Discussion <br /> Groundwater flow direction appears consistent with historically observed trends Contaminants observed <br /> in two wells appear to be highly degraded TPH quantified as Kerosene However, these did not match <br /> the Kerosene standard and are interpreted to be residual TPH If the highly degraded TPH to none <br /> detected trend continues for two more quarters, then a proposal for site closure will be made to PHS- <br /> EHD <br /> Monitoring Schedule <br /> The quarterly monitoring for this site is scheduled to continue at quarterly intervals <br />