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WORKPLAN FOR WELL ABANDONMENT ACTIVITIES AT PG&E'S <br /> LATHROP DEHYDRATOR STATION <br /> MONITORING WELL ABANDONMENT PROCEDURES <br /> The abandonment procedure for monitoring wells is as follows: <br /> 1) destroy the well box or monument and concrete base or other surface well finish using <br /> appropriate hand tools and/or powered equipment <br /> 2) overdrill the borehole, to the maximum depth, with a hollow-stem auger drilling rig, <br /> using augers of similar diameter to that which were used to install the well <br /> 3) tremie grout the overdrilled borehole from the bottom of the well up to six-feet below <br /> ground sufrace <br /> 4) backfill the top six-feet with native soil <br /> WASTE DISPOSAL PLAN <br /> The material brought to the surface during the overdrilling will essentially comprise gravel <br /> filter pack,PVC and/or concrete debris, and some native soil. All of this material is non- <br /> hazardous demolition waste and will be stored onsite on plastic sheeting until collection <br /> for disposal to an appropriate landfill facility. <br /> PERSONNEL AND PROCEDURES <br /> Environmental work described in the workplan will be performed under the direction of a <br /> California Registered Geologist, Certified Engineering Geologist or Hydrogeologist, or <br /> Professional Engineer(herein referred to as Licensed Professional). <br /> HEALTH AND SAFETY PLANS(HSP) <br /> A Health and Safety Plan will be required and followed for all personnel working on site. <br /> CH2M HILI..has developed a site-specific HSP for PG&E's Lathrop facility, which is <br /> available for review upon request. The necessary personal protective equipment (PPE) and <br /> environmental monitoring equipment will be used as specified in the HSP. <br />