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• Groundwater 9Monitor Well Installation Work Plan City of Manteca Wastewater Treatment Facility ' Page 2 A Water Well Driller's Report is available for a supply well located at the Facility. This well was drilled to a depth of 185 feet below ground surface (bgs) in 1987. The well log indicates 14 feet of sand underlain by 3 feet of clay, 18 feet of sand, another 3 foot clay layer, 14 feet of sand, and then a 7 foot clay layer to a depth of 59 feet bgs. With the exception of a 23 foot clay layer between 100 and 123 feet, the remainder of the well boring consists primarily of sand and coarse sand interbedded with occasional ' 3-foot to 10-foot clay layers. 4.0 FIELD AND ANALYTICAL METHODS MW-9E DESTRUCTION 4.1 SITE PREPARATION A monitor well destruction permit will be obtained from the San Joaquin County Environmental Health Division. Prior to initiating the fieldwork, MW-9E will be marked with white paint and/or flagging and ' Underground Service Alert (USA) will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in the vicinity of the work area. It is the responsibility of the property owner to locate and identify private underground utilities in and near the work area. 4.2 : ' DESTRUCTION DETAILS ' Well MW-9E will be destroyed by a California C-57 licensed driller. The existing 6-inch monitor well casing will be over drilled and removed using a 12-inch outside diameter hollow stem auger(HSA). The hole will be filled with impervious material and/or grout to 5 feet below ground surface and the ' remaining excavation will be filled with native soil. Well destruction activities will be performed under the supervision of a California Professional Geologist. Drill cuttings and well debris will be left onsite. 5.0 FIELD AND ANALYTICAL METHODS MW-11 INSTALLATION 5.1 SITE PREPARATION A monitor well installation permit will be obtained from the San Joaquin County Environmental Health tDivision. Prior to initiating the fieldwork, the boring location will be marked with white paint and/or stakes and USA will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in the vicinity of the work area. It is the responsibility of the property owner to locate and identify private underground utilities in and near the work area. 5.2 DRILLING DETAILS The monitor well will be installed by a California C-57 licensed driller. The well will be located at the side of the access road bisecting Field 11. The boring for the monitor well will be drilled using an 8-inch outside diameter, continuous-flight hollow-stem auger. Drilling and well installation activities will be performed under the supervision of a Condor geologist. Drill cuttings from the monitor well boring will be logged in accordance with the Unified Soil Classification System (USCS). Descriptions of soil types encountered will be recorded on geologic logs. All down-hole drilling equipment will be steam cleaned 1 prior to use. The drill cuttings will be spread on the ground surface in the adjoining agricultural field. The monitor well boring will be drilled to 15 feet below the water table. It is anticipated that groundwater ' will be first encountered at approximately 5 to 10 feet bgs. The monitor well will be constructed with 15 feet of 2-inch ID, Schedule 40, flush-threaded, machine-slotted PVC screen (0.020-inch slot size). To provide a zone to seal off the screened zone from the surface, at least 5 feet of blank casing will be ' placed above the screened section and will extend to approximately 3 feet above the ground surface. A flush-threaded PVC bottom cap will be placed at the bottom of the screen section. No plastic glue or solvents will be used in well construction. ' CONDOR