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Work Plan for Additional Subsurface Investigation
<br /> Former Helena Chemical Facility
<br /> July 13,2020
<br /> Page 8
<br /> 5.6 SOIL AND GROUNDWATER WASTE DISPOSAL
<br /> All down-hole drilling equipment will be steam-cleaned or triple rinsed prior to use at each location. Soil
<br /> cuttings, rinsate, and groundwater waste generated during field activities will be placed in DOT-approved
<br /> 55-gallon drums, sealed, labeled, and left on Site to await disposal pending results of the laboratory
<br /> analyses.Disposal of hazardous materials,if any,will be the responsibility of the property owner. If stored
<br /> groundwater contains 1,2,3-TCP at a concentration exceeding the MCL of 0.005 gg/L,it will be transported
<br /> to a licensed treatment, storage, and disposal facility.
<br /> 6.0 REPORTING
<br /> Condor will prepare a report detailing the well installation activities, observations, and conclusions to be
<br /> submitted to the Central Valley Water Board.The report will include a discussion of the field and laboratory
<br /> procedures,a discussion and presentation of the analytical results, and recommendations, as appropriate.
<br /> 7.0 PROJECT SCHEDULE
<br /> Work can commence upon approval of this work plan by the Central Valley Water Board and notification
<br /> by the property owner to proceed. The field portion of the investigation can be completed within
<br /> approximately four to six weeks after the necessary permits are received, depending on driller availability.
<br /> A report can be submitted to the Central Valley Water Board within six weeks of receipt of laboratory
<br /> analytical results.
<br /> 8.0 REFERENCES
<br /> Geoprobe Soil Assessment, Helena Chemical Company, 2245 West Charter Way, Stockton, California,
<br /> Kleinfelder,July 30,2002
<br /> Site Investigation Report,Former Helena Chemical Facility,2245 West Charter Way, Stockton,California,
<br /> Condor Earth,July 22,2016
<br /> Site Investigation and Well Installation Report,Former Helena Chemical Facility,2245 West Charter Way,
<br /> Stockton, California, Condor Earth, October 3,2018
<br /> Site Investigation Report,Former Helena Chemical Facility,2245 West Charter Way, Stockton,California,
<br /> Condor Earth, September 20, 2019
<br /> 2020 First Semi-Annual Groundwater Monitoring Report, Former Agricultural Chemical Distribution
<br /> Facility, 1904 Charter Way, Stockton, California, Geosyntec Consultants,May 1,2020
<br /> 9.0 LIMITATIONS AND SIGNATURE
<br /> Condor prepared this Work Plan in a manner consistent with the standards of care and skill ordinarily
<br /> exercised by members of the profession practicing under similar conditions in the geographic vicinity and
<br /> at the time the services were performed. Condor has endeavored to determine as much as practical about
<br /> the site using conventional practices given our scope of services. Condor's involvement in the work
<br /> performed at this site has been limited to interpreting hydrogeological data provided by others. Condor is
<br /> not responsible for the accuracy and completeness of information collected and developed by others. Data,
<br /> designs, and professional opinions presented in this Work Plan are based on limited information obtained
<br /> at the time the work was performed. If any changes are made or errors found in the information used for
<br /> this report,the interpretations and designs contained herein shall not be considered valid unless the changes
<br /> or errors are reviewed by Condor and either appropriately modified or re-approved in writing.
<br /> ��r CONDOR
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