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C LEARWATER <br /> G R o U P I N C <br /> Efl[1rD11 fn t'n(11 Stri ices <br /> In. addition, groundwater samples were collected from each temporary soil boring Groundwater <br /> samples were then chilled and shipped to the project lab for determination of concentrations of fuel <br /> hydrocarbons (gasoline-range hydrocarbons by EPAM 5030/8015M), volatile aromatic <br /> compounds (benzene, toluene, ethyl benzene and xylenes by EPAM 8020) and the gasoline <br /> additive MTBE by EPAM 8260 <br /> The soil borings were advanced, and monitoring wells completed in accordance with the attached <br /> protocols (Appendix A) The wells are constructed of two-inch diameter materials, and completed <br /> at a depth of 25 feet bgs (Appendix B) The wells are screened with 0 020" slotted schedule 40 <br /> PVC well screen from the completed depth of the well to five feet bgs, with the screen flush <br /> threaded to a five foot length of solid PVC riser, completed at grade within a tamper-resistant well <br /> box A filter pack of #3 Lone Star sand was placed from completed depth to 2 feet above the <br /> slotted PVC Hydrated bentorute overlain by neat cement was used to seal annular space around <br /> solid riser <br /> Monitonng well MW-5 was properly destroyed by overdrillmg and grouted flush to surface All <br /> . cuttings were drummed for disposal <br /> 4.0 GROUNDWATER MONITORING ACTIVITIES <br /> Ou March 9, 2000, all site monitoring wells were gauged, surveyed, then developed or purged <br /> before sampling An electronic water level indicator, accurate to within ±0 01-foot, was used to <br /> gauge depth to water The three new monitoring wells were developed by purging ten well <br /> volumes, or until they went dry, at which point sampling parameters (temperature, pH, and <br /> conductivity) had stabilized All wells were surveyed using a existing reference datum for <br /> elevation above mean sea level Groundwater monitoring and well purging information, and well <br /> survey data are presented on Gauge Data/Purge Calculations, Well Development and Well Purging <br /> Data sheets (Appendix C) <br /> Following recovery of water levels to at least 80% of their static levels, groundwater samples were <br /> collected from the wells using polyethylene bailers, and then transferred to laboratory-supplied <br /> containers Sample containers were labeled, documented on a chain-of-custody forms, and placed <br /> on ice in a cooler for transportation to the project laboratory Groundwater samples were analyzed <br /> • <br /> ZB 178C 4 3131100 <br />