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Monitoring Well Installation Report Quik Stop Market No 121 Page 5 7) Presented the results of the well installations and findings in this report Field Investigation Prior to beginning the field work, the proposed boring locations were cleared for underground utilities by notifying Underground Service Alert (U S A), and retaining a private line location firm From November 29 through December 29, 2000, CCI installed a total of five additional groundwater monitoring wells Monitoring Well Installation Three of the 2-inch diameter groundwater monitoring wells (MW-4, MW-5 and MW-7) were drilled with a truck-mounted, B-61 drill rig with continuous-flight, hollow-stem auger with a 4- 1/4-inch inside diameter The 4-inch recovery well (RW-1) was installed using 10-inch outside diameter hollow stem augers The auger and other tools were steam-cleaned before drilling each boring to minimize the possibility of cross-contamination All drill cuttings were placed in Department of Transportation (DOT)- approved drums, labeled and placed on the southwest side of the property The boring for each well was drilled in the following manner the drill rig was positioned over the boring location, and the hollow-stem auger was used to advance the hole to the desired sampling depth A CCI geologist logged the borehole by collecting relatively undisturbed soil samples at random depths by logging the soil cuttings Soil samples were collected using a pre- cleaned, modified, California split-spoon sampler with internal 2-inch diameter by 6-inch long brass liners The sampler was driven 1-1/2 feet ahead of the auger with a 140-pound, rig- operated hammer The sampler was then removed and disassembled into its component parts The soils encountered were characterized using the Unified Soil Classification System Boring logs for each well are included in Appendix B Due to encountering massive flowing sands during the drilling of monitoring well MW-4, mud- rotary was used to install monitoring well MW-6 to a depth of 75 feet A B-61 drilling rig set-up for mud-rotary drilling was used Drilling fluid was circulated through the drilling rods and the well was drilled to a total depth of 75 feet Drilling fluid was circulated to clean out the hole prior to installing the well casing Monitoring Well Construction Monitoring wells MW-4, MW-5, MW-6 and MW-7 were constructed using 2-inch diameter, schedule 40 polyvinyl chloride (PVC) well casings Between ten and fifteen feet of 0 020-inch