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F , <br /> 51 <br /> �. <br /> Clayton <br /> ENVIRONMENTAL <br /> CONSULTANT5 <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 /> j <br /> and the drum contents and left at the site. <br /> 3.2 MONITORING WELL SAMPLING <br /> Monitoring well MW-3E 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 />� . <br /> 3.3 MONITORING WELL AND DOMESTIC WATER WELL ABANDONMENT <br /> " MW-3 was over-drilled with a 10-1/2 inch auger to 25 feet, thus removing any of tae <br /> i existing well casing, screen, and filter pack,.and back-filled with neat grout to round <br /> surfacer <br /> The domestic water well, approximately 130 feet in depth,was filled with treat grout <br /> using a tremie hose that was extended to the bottom of the well. The well was filled <br /> �i 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 /> with a neat grout. <br /> 1 3 3.4IDROGEOLOGY <br /> a ! Soils.underlying the site generally consist of clayey sands, sand <br /> y clays, and gravelly <br /> sands with gravel being more abundant near the surface. <br /> I x J Depth to groundwater ranges from approximately 8 to 12 feet in the three wells. Well ` <br /> elevations'were surveyed to datum sea level b Mr. Bruce Trono <br /> Y ff, a licensed surveyor <br /> I and plotted on a scaled.map (Appendix G). From the well elevation data, <br /> 1 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 /> 1 <br /> 4.0 LAHOl�4►TORY ANALM_T.0 <br /> 4.1 ` PURPOSE AND SCOPE <br /> Analysi s were selected`to.assess soil and groundwater for possible contamination from <br /> n' the former gasoline and septic tanks on the subject site. The soil and groundwater <br /> samples were analyzed by the following methods: <br /> x I -3- <br /> 326*Lre? <br /> r <br /> r.v <br /> 1 <br /> ! q <br /> m „r <br /> },ULR ^tic f <br />