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Mr. Alan M. Buehler <br /> May 19, 2017 <br /> Petroleum hydrocarbon concentrations during the third quarter 2016 and first quarter 2017 were low or <br /> not detected above laboratory reporting limits. Further details regarding the third quarter 2016 and first <br /> quarter 2017 monitoring and sampling events are included in the Semi-Annual Groundwater Monitoring <br /> and Remediation Progress Reports, dated October 28, 2016 and May 19, 2017, respectively. <br /> During the third quarter 2016 and first quarter 2017 groundwater sampling events, Arcadis collected <br /> samples from accessible air sparge wells in order to collect data in areas where monitoring wells were <br /> dry. In addition, as discussed in the April 17, 2017 meeting between Arcadis and Mr. Alan Buehler of the <br /> CVRWQCB, additional wells had sufficient water for sampling during the first quarter 2017 event after <br /> receipt of the CVRWQCB's letter as compared to the third quarter 2016 event. Because more recent data <br /> have been collected from some of the historically dry wells and data from some air sparge wells were <br /> collected, Arcadis does not recommend additional well installation and/or replacement at this time. <br /> As recommended in the Semi-Annual Groundwater Monitoring and Remediation Progress Report-First <br /> Quarter 2017, Arcadis is proposing continued operation of the current air sparge/soil vapor extraction <br /> system at the site based on the results of the rebound test. Therefore, Arcadis proposes implementation <br /> of the soil sampling described above after system shut down in order to accurately evaluate post- <br /> remediation site conditions. <br /> If you have any questions or comments regarding the contents of this report, please contact Megan <br /> Smoley at 626.590.1502 or by e-mail at megan.smoley@arcadis.com or Sherrie Lang of Arcadis at <br /> 916.865.3171 or by e-mail at sherrie.lang@arcadis.com. <br /> Sincerely, <br /> Arcadis U.S., Inc. � �Cr,AL <br /> ti !� <br /> MEGAN E.WOLEY 4 <br /> / q,7 Ne et,1< <br /> Sherrie Lang Megan Smoley, P.G. �T Gc C t�C" <br /> kL <br /> Associate Project Manager Senior Geologist <br /> Copies: <br /> Lisa J. Berg and Associates <br /> Electronic Copy to Geotracker <br /> Enclosures <br /> Tables <br /> 1 Evaluation of Dry Wells and Summary of Most Recent Available Groundwater Data <br /> 2 Current Groundwater Monitoring and Analytical Data <br /> 3 Historical Groundwater Monitoring and Analytical Data <br /> 4 Soil Boring and Well Construction Details <br /> arcadis.com Page. <br /> CA 06100 170519 BP Revised Work Plan docx 5/6 <br />