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Cyton <br /> ENURUVk1LV1AL <br /> f11♦SUliiViS <br /> Lithological logs recording the soil types underlying the site were maintained by <br /> Clayton's geologist. Copies of these logs are presented in Appendix D Soil samples <br /> were collected at approximately 4 feet and 9 feet bgs (Appendix E). <br /> Waste drill cuttings and purge water from well development and sampling, were placed <br /> into Department of Transportation (DOT)-approved drums for proper disposal at a <br /> later date. These drums were labeled with the name of the site, address, well number, <br /> and the drum contents and left at the site. <br /> 3 2 MONITORING WELL SAMPLING <br /> Monitoring well MW-3B was developed with an electrical submersible pump to remove <br /> silt from the sand pack and turbid water caused by drilling operations on January 11, <br /> 1991. Approximately 40 gallons of water was removed from the well <br /> Groundwater was sampled from monitoring wells (MW-1, MW-2, and MW-3B) on <br /> January 15, 1991. Water sampling data sheets are presented in Appendix F. <br /> 3 3 MONITORING WELL AND DOMESTIC WATER WELL ABANDONMENT <br /> MW-3 was over-drilled with a 10-112 inch auger to 25 feet, thus removing any of the <br /> existing well casing, screen, and filter pack, and back-filled with neat grout to ground <br /> surface. <br /> M The domestic water well, approximately 130 feet in depth,was filled with neat grout <br /> using a tremae hose that was extended to the bottom of the well. The well was filled <br /> �J from the bottom to approximately 3 feet below ground surface (bgs) <br /> The top three feet of the well was excavated, the steel casing cut and then capped <br /> i� <br /> with a neat grout <br /> 3.4 HYDROGEOLOGY <br /> Soils underlying the site generally consist of clayey sands, sandy clays, and gravelly <br /> sands with gravel being more abundant near the surface <br /> Depth to groundwater ranges from approximately 8 to 12 feet in the three wells. Well <br /> elevations were surveyed to datum sea level by Mr Bruce Tronoff, a licensed surveyor <br /> and plotted on a scaled map (Appendix G) From the well elevation data, <br /> groundwater flow direction was calculated to be north. The groundwater gradient is <br /> 0.3 foot elevation drop per 100 feet of horizontal distance <br /> -- 4.0 LMOR&T=ANALYSIS <br /> 4.1 PURPOSE AND SCOPE <br /> Analyses were selected to assess soil and groundwater for possible contamination from <br /> the former gasoline and septic tanks on the subject site. The soil and groundwater <br /> samples were analyzed by the following methods- <br /> -3- <br />