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Letter Addendum-Workplan for the Installation of ISCO Injection Points <br /> 1501 West Charter Way, Stockton, CA <br /> Page 2 of 2 <br /> laboratory analysis. This should allow for a representative cross-section of the heaviest <br /> contaminated soil beneath the former UST location. The brass tubes will be sealed with Teflon® <br /> tape, capped, uniquely labeled, and stored in an ice chest refrigerated to a temperature of <br /> approximately 4° C for shipment under chain of custody protocol. <br /> Neat cement grout will be pumped into the boring through a tremie pipe system in one continuous <br /> operation until the boring is completely full. All drill cuttings will be temporarily stored in properly <br /> labeled DOT approved steel drums until disposal can be arranged. A soil boring permit and <br /> associated fees will be submitted to SJCEHD upon approval of this workplan addendum. <br /> To collect a representative groundwater sample for the BST, GZA personnel will purge three <br /> volumes from monitoring well MW3, allow the water column to return to pre-purge levels, and <br /> collect groundwater in eight unpreserved 1-Litre amber bottles. The bottles will be filled <br /> minimizing headspace, uniquely labeled and stored in an ice chest refrigerated to a temperature of <br /> approximately 4° C for shipment under chain of custody protocol. <br /> Groundwater and selected soil samples will be submitted to Prima Environmental (Prima) of <br /> Sacramento, California. Prima will perform a bench scale evaluation of RegenOxTM for use in in- <br /> situ chemical oxidation of petroleum hydrocarbons. Prima will also evaluate the secondary effects <br /> such as oxidation of soil-bound chromium to CR (VI), oxidation of naturally occurring bromide to <br /> bromate, or mobilization of metals. <br /> The results will be sent to the RWQCB and EHD for review and comments. Prima's proposal for <br /> bench scale evaluation is included with this letter addendum as Attachment A. Prima's proposal <br /> was approved by the RWQCB by email dated December 27, 2007. If it is determined that the use <br /> of RegenOxTM is appropriate for the Site, the September 2007 Workplan will be revised to <br /> address RWQCB and SJCEHD comments and directives. <br /> Please feel free to call GZA at (209) 838-9888 if you have any questions regarding this submittal. <br /> Respectfully, <br /> Ground Zero Analysis Inc. ��pVOA AL 6F01 <br /> � O <br /> IL EM LEE PRICE v4 <br /> Eric L. Price, PG No. 8414 • I�Ki4 <br /> Registered Environmental Assessor No. 8242 <br /> 1� <br /> Attachments <br /> cc: Mr. Nathan Crum, Valley Pacific Petroleum Services, Inc. <br /> Ms. Karen Collins, Environmental Closures, Inc. <br /> Mr. James L. L. Barton, RWQCB <br /> G:\GROLTNDZE\WOOLSEY.CHT\Reports\Workpl-s\WP Addendum 0801.doc <br />