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' Creolo ica[Teclutfcslnc Page 8 g 2nd Quarter 2004 Groundwater Monitoring Report Project No 547 2 August 30,2004 w Wells Date Benzene Toluene Ethyl Total TPH MTBE u u L Benzene Xytenes Gasoline u L u L GP-3 03/19/04 13 900 393 258 8,110 85.4W 04/02/04 13,900 600 3,930 13,800 128,000 395 ' 04/16/04 14 00 000 575 3 490 8 860 78 9 331 04/28/04 29 900 628 2 40 750 7,5 84,300 459 05/14/04iil 13,700 778 3,670... 10,400 91.900 327 05/26/04 16,100 1,280 3,720 11,800 92 400 347 ' 06/11/04 16,400 1,540 3,390 9,770 106 000 412 06/25/04 15 400 1,860 3,410 9,930 110,000 256 07/08/04 13,800 843 4,020 13,300 143,000 247 The data indicate that NIW-9 has experienced a significant reduction in contaminant concentrations since the infection process started This is expected since it is the injection point The reduction in the three mucro-wells is less but measurable but the initial results show promise for this remedial technology The significant rise in TPH concentrations in ' GP-3 suggests that the infected oxidant initially caused a release of sorbed gasoline from the soil A report on the pilot test is under development 5.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and ' practice in effect at the time Services were rendered It should be recognized that definition and evaluation of environmental conditions is an inexact science and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at ' the present time may change as knowledge increases and the state of the practice continues to improve Further, that diffenng subsurface soil characteristics can be experienced within a small distance and therefore cannot be known in an absolute sense All conclusions and ' recommendations are based on the available data and information. The tasks proposed and completed during this project were reviewed and approved by the ' local regulatory agency for compliance with the law No warranty, expressed or implied, is made 1