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page 2, 2905-2908 Benjamin Holt Drive <br /> I <br /> SJC/EHD approves the installation of offsite shallow monitoring well MW-10. SJC/EHD <br /> approves the installation of boring AS-11 to delineate the extent of the 1, 2-dichloroethane <br /> plume. ARCO owned monitoring wells E-8 and E-7 are located in the middle of Plymouth <br /> Drive. These wells are frequently not sampled due to safety issues posed by traffic on j <br /> this street. If ARCO prefers not to sample these wells they must submit.a work plan to <br /> have them properly destroyed; these wells could be replaced by one shallow well located <br /> on the east side of Plymouth Dr., near proposed boring AS-11. <br /> The `addendum' portion of this work plan refers to a previously submitted and approved <br /> work plan dated February 18, 2005 submitted by SECOR on behalf of Chevron #9-4275. <br /> All onsite monitoring and remediation wells that belonged to Chevron #9-4275 were <br /> destroyed in May 2005 pending reconstruction of the station. SECOR is proposing in this <br /> addendum to change the construction of the monitoring wells when they are re-installed <br /> from total depth of 30 feet bsg to total depth of 20 feet bsg, with 15 feet of screen interval. <br /> This change is proposed because current depth to groundwater at the site is <br /> approximately 10 feet bsg. SJC/EHD approves this change in the construction of the <br /> replacement monitoring wells. <br /> Please proceed with submittal of a San Joaquin County Well Permit Application and <br /> required $89.00 permit fee for each parcel of land on which drilling will take place. Offsite <br /> borings will also require access agreements and/or City of Stockton revocable and <br /> encroachment permits, copies of which must be submitted to SJC/EHD before drilling <br /> permits can be issued. Implementation of all proposed and approved work must begin no <br /> later than October 3, 2005, and a report of findings must be submitted to SJC/EHD within <br /> 60 days following completion of all fieldwork, and must be presented within the context of <br /> a site conceptual model. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> i <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> lel �-• lelz <br /> � <br /> Lori Duncan, Senior REHS Nuel C. Henderson; Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> i <br /> i <br /> cc: James Barton, CVRWQCB <br /> Diane.Barclay, SECOR <br /> i <br /> t <br /> i <br />