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r <br /> • page 2,2905.2908 Benjamin Hoft Drive <br /> SJC/EHD approves the installation of offsite shallow monitoring well MW-10 SJCIEHD <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 <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 SJCIEHD 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 SJCIEHD 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 SJCIEHD 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 /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C Henderson, Jr, PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc James Barton, CVRWQCB <br /> Diane Barclay. SECOR <br />