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Monitor Well Destruction and Installation Report City of Manteca Wastewater Quality Control Facility ' Page 4 A dedicated submersible direct-current (DC) pump was installed at the well during development. The ' bottom of the dedicated pump was set approximately 1-foot above the bottom of the well. Details of the pump installation are presented in Table I. One-half inch OD polyethylene discharge tubing was used as drop pipe for the pump installation. The well cap at the well included a quick connect fitting for ' attachment of clean, new 0.5 inch OD discharge tubing for sampling and purging events. The well cap also included a 0.5-inch ID opening and removable plug to permit access for a water level probe. ' After development, the well was treated with 0.75 oz of 3 percent sodium hypochlorite (bleach) to disinfect the well. The treatment resulted in a chlorine concentration of 100 mg/mL in the well. One hundred gallons of water were purged from the well the next day. No chlorine was detected after 40 gallons were pumped from the well after treatment. ' Groundwater well development logs are included in Attachment C. ' Results of the initial measurements are: Temperature, degrees C 19.5 Conductivity, µmhos/cm 425 Depth to well bottom, feet 27.51 Depth to water, feet 14.56 Static Water Elevation,feet msl 22.02 7.0 WELL CASING SURVEY ' Following completion, the well was surveyed to determine the location of the well and the elevation of (1) a survey point at the ground surface, (2) the measuring point (MP) at the top of the well casing. The elevation was surveyed to the NAVD88 datum. The surveyed well coordinates and the NAVD88 elevations for the new monitor well MW-11 are presented on Table 2. The Surveyor's Report is included ' in Attachment B. Table 2 ' Surve ed Well Location—Well MW-11 SURVEY POINT at MEASURING ' WELL LATITUDE LONGETUDE NORTHING EASTING GROUND SURFACE POINT Cal Zone 3 Cal.Zone 3 U.S.Surve Fc U.S.Surve F, (NAVD88)M.S.L Ft. (NA VD88)M.S.L Ft. M -II 37.794 -121.258 2112425.36 6342547.01 33.99 36.58 ' 8.0 LIMITATIONS Condor developed the interpretations and conclusions presented herein in accordance with generally ' accepted principles and practice. Conclusions presented in this report are professional opinions based on the information provided herein. Condor has endeavored to determine as much as practical about the site using conventional practices given our scope of services. Condor makes no representation as to the ' subsurface conditions at locations or times other than those logged by Condor and reported in this document. If any changes are made or errors found in the information utilized in this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes are ' reviewed by Condor and either appropriately modified or re-approved in writing. Condor's involvement in the work performed at this site has been limited to observing the installation of ' the monitor well, well development, installation of a dedicated pump, and preparation of this report. ' CONDOR