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si <br /> Port of Stockton UST Site #3 page 2 <br /> Port Rd 13 & G, Stockton. <br /> COMMENTS AND CONDITIONS: (continued) <br /> • Existing monitoring wells may be screened across two areas of <br /> contamination. Additional subsurface characterization is needed <br /> that identifies the nature and extent of the dissolved petroleum <br /> source, the subsurface migration pathways, and the relationship the <br /> existing monitoring wells exhibit with respect to these parameters <br /> and the fluctuating groundwater gradient directions. Report <br /> conclusions should address these concerns and whether the <br /> existing monitoring wells need replacement. <br /> • MtBE and 1,2-Dichloroethane (DCA) impacted soil and`groundwater <br /> delineation is required." Collect and analyze selected soil and ALL <br /> groundwater samples for MtBE and 1,2-DCA by EPA Method 8260. <br /> • To aid EHD's review of future work plans, please justify each element <br /> of a work plan in the context of a Site Conceptual Model (SCM) <br /> constructed from the available date for the site. The need for <br /> replacement of existing monitoring wells in the `core' area should be <br /> demonstrated by SCM. ' <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN [H&S Section <br /> 25299.37(c)(3)1: <br /> • none. <br /> Please contact Michael Infurna, Senior REHS, at (209) 468-3454 if you have <br /> any questions or wish to discuss the site. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Michael J. Infurna Jr., Senior EHS Nuel C. Henderson Jr. RG <br /> LOP 1 Site Mitigation Unit IV LOP 1 Site Mitigation Unit IV <br /> MI/ <br /> c: CVRWQCB — Marty Hartzell, Sacramento. <br /> c: SWRCB — CUF — Mark Owens, Sacramento. <br /> c: Geomatrix Consulting — Bradley A. Loewen RG, 2444 Main, #215, Fresno <br /> [X] Faxed to consultant on: a <br /> f <br />