ARCHIVED REPORTS XR0012698 - Laserfiche WebLink

Home Browse Search

i interbedded lenses are underlain by a low estimated permeability clayey silt which extends to a depth of at least 72 ft below ground surface. Groundwater was encountered in each boring at depths of between 66 ft to 67 ft below ground surface and was unconfined. A photoionization detector(PID)was used in the field to screen sail samples for volatile organic compounds. PID readings are indicated on the boring logs. r� 3.2 MONITOR WELL INSTALLATION AND DEVELOPMENT a� Three 2-inch diameter monitor wells,MW-5,MW-6 and MW-7,were constructed in soil borings I B-5, B-6 and B-7, respectively. The WGR standard operating procedure for monitor well installation is included in Appendix A. Well construction details are included on the boring logs which are presented in Appendix B. The wells screened intervals extend 3 ft below static water to ens between 4 ft to 17 ft above the static water level in each well. For each well the well screen extends from the lower extent of the water bearing zone up to the upprr extent of the estimated first water bearing zone. f Monitor wells MW-5,MW-6 and MW-7 were deieloped on 14 June 1990 by WGR environmental technicians,according to the WGR Standard Operating Procedure for well development included j in Appendix A. Development was performed using a combination of bailing and surge block techniques. Approximately 19 gallons of water was removed from the three wells at approximate L; flow rates between 0.14 gallons-per-minute(gpm)up to 0.2 gpm. f F Y 3.3 LIQUID-HYDROCARBON AND GROUNDWATER SAMPLING - i Groundwater samples from monitor wells MW-2 and MW-4 through MW-7 were collected on 15 June 1990 by WGR environmental technicim is accordance with the WGR standard operating procedure for water sampling,which is included in Appendix A. Groundwater samples were not 066RUTA.va __ _ - 6 i