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13 June 1995 <br /> AGE-NC-95-0125 <br /> Page 2 of 5 <br /> were detected in soil samples collected during the insiallation of the monitoring wells. However; <br /> organic vapors were detected in soil sample's from MW and MW-7. 'No investigation of soil in the <br /> vicinity'of the tank pit or northwest of MW-2`has been undertaken. <br /> 2.4. GROUND WATER MONITORING <br /> Groundwater samples,have been collected at the site on eight occasions since June-1987. Petroleum . <br /> hydrocarbons were detected intermittently at the site 'The depth to groundwater.-at the site was ; <br /> approximately 8 feet below surface grade during .the last sampling. event (January 1992). <br /> Groundwater flow. direction at the site has histori ally been to the north at a gradient_ of <br /> approximately 0.01 ft/ft. <br /> During the most recent sampling in October and November 1994;,Iow concentrations of toluene <br /> detected in 9 of 10 wells. TPH-g was detected only ir well MW-2. Laboratory results of ground <br /> water samples from the fourth quarter oft-995-we included in Table 1: <br /> TABLE 1 <br /> ANALYTICAL RESULTS OF GR01JND WATER SAMPLES <br /> LAN MERSVILLE SCHOOL DISTRICT <br /> 13 October and 23-NoN ember 1994 <br /> (ug/-) <br /> Well TPH as Ethyl' <br /> ID Date ' Gasoline' Benzene Toluene -benzene Xylene :. <br /> MW-1 10-13-94 ND 2.1 0-52 1.5 1.4 <br /> MW-2 11-23-94 150 1.9 0.95 ND 3.7 <br /> MW-3 11-23-94 ND ND 0.93 ND ND <br /> Mw=4 11-23-94 ND ND 0.78 ND ND <br /> MW-5 10-13-94 ND ND ND, ND... ND <br /> i <br /> MW-6 10-13-94 ND- ND 0.87 ND ND - <br /> MW-7 10-13-94 ND ND 1.1 ND ND <br /> MW-8 11-23-94 ND ND 0.54 ND ND. <br /> MW-9 10-1-3-94 . . ND ND . 0.63 ND ' ND <br /> MW-10 10-13-94 ND ND 0.89 ND ND- <br /> p,@VL=Pacts per biUi-(ppb). ND=None Dc cmd <br />