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1 - <br /> Raymond Greer,Albert and'Ada Veldstra <br /> 19364 Stemegul Road, Escalon <br /> Page 2 of 2 <br /> During the SJC/EHD's review of the site data, it was noted that there is a permeable zone <br /> that includes the 95 to 100 feet bsg screen interval of monitoring well MW6 that appears <br /> to have lateral continuity across your site (see the existing CPT logs). If so, this zone, <br /> which has the highest 1,2-dichloroethane (1,2-DCA) concentrations may be a significant <br /> lateral migration pathway. For this reason, the SJC/EHD recommends selecting the final <br /> locations for the proposed well in this interval after the CPT data has been analyzed. <br /> The SJC/EHD is concerned that the domestic well on the adjacent property immediately <br /> north of your site is not being sampled for laboratory analysis for the chemicals of concern <br /> related to the unauthorized release on your site. The SJC/EHD is not aware of the <br /> construction details for the domestic well. It is imperative that this well be included in the <br /> routine quarterly sampling program. If your consultant is having difficulty obtaining access <br /> or consent to sample the well, document this in the quarterly reports along with the <br /> measures taken by your consultant to comply with this directive. <br /> The SJC/EHD is aware that the current property owner/resident has requested that the <br /> noise generated by the remediation equipment be reduced or muffled. It is important that <br /> the tranquility of the residence be protected, therefore you are directed to take such <br /> feasible and appropriate actions as may be necessary to reduce the volume of noise to a <br /> more acceptable level. Include potential measures in the work plan addendum and report <br /> progress on this issue in future quarterly reports. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV Engineering Geologist, Unit IV <br /> cc: James Barton, PG, CVRWQCB <br /> Jeanne Homsey, PE, ATC <br /> Lorraine Sawyer, PG, ATC <br />