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CGeofogicalTechracs inc Page 5 <br /> Groundwater Monitoring Report <br /> Project No 425 2 <br /> February 9, 1999 <br /> 3 0 CONCLUSIONS AND RECOMMENDATIONS <br /> IONS <br /> The following conclusions have been drawn regarding the status of the groundwater at this <br /> site and recommendations for future work <br /> Conclusions <br /> 1 Petroleum hydrocarbons are present in five of the twelve monitoring wells <br /> 2 The shallow water table groundwater plume is laterally defined except to the west <br /> 3 Free-floating gasoline was present in MW-2 in February 1998 but was not present during <br /> this monitoring event <br /> 4 Petroleum hydrocarbons in the groundwater at the site appear to be on a decreasing trend <br /> in most of the wells <br /> 5 It does not appear that groundwater contamination is migrating vertically as MW-102 has <br /> been non-detect for two events and MW-202 is decreasing rapidly The contamination <br /> that has been detected in these wells maybe a result of drilling artifacts <br /> 6 Groundwater gradient historically flows in a northern direction at about 0 002 ft/ft <br /> 7 Two domestic water wells, located within about 150 feet down gradient from MW-2, and <br /> one domestic well, located approximately 120 feet cross gradient, continue to be non- <br /> 1• detect for gasoline compounds <br /> 8 With several domestic wells associated with the residence surrounding the property and <br /> the wells for the elementary school located a short distance northeast of this property, this <br />' groundwater plume appears to continue to pose a significant threat to public health and <br /> the enviromnent <br />' Recommendations <br /> The following recommendations are made <br /> 1 The wells should be sampled for natural attenuation parameters during future monitoring <br /> events so it maybe determined if the plume is stable, expanding, or shrinking <br /> 2 This site should be evaluated for the need of contaminant source removal to provide <br /> protection to surrounding water wells and to achieve closure <br /> 40 LIMITATIONS <br />' was prepared in accordance with the accepted standards and practices of the field <br /> This report p p p <br />' of environmental geology, groundwater hydrology and good business practices It should be <br /> recognized that definition and evaluation of environmental conditions is a difficult and <br /> inexact science Judgments leading to conclusions and recommendations are generally made <br /> with an incomplete knowledge of the site specific conditions present <br />