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r <br /> Dennis Kim ti./ � <br /> 22633 Mount Edan <br /> Page 3 of 3 <br /> containers of uncertain use found at depth as great as 12 feet BGS, this <br /> opens the possibility that some contamination, i.e. that encountered in B-5 <br /> and PB-2, represents disposed contaminants not related to the UST <br /> release. <br /> • It is not clear that the impacted groundwater encountered in boring PB-2 <br /> represents the most impacted groundwater or the margin of a significantly <br /> more serious plume, or that it is related to the former UST release. <br /> • At this time, required site information has not been submitted to the <br /> GeoTracker Database maintained by the State Water Resources Control <br /> Board. <br /> To facilitate EHD's evaluation of the closure request please complete the <br /> following actions: <br /> • Prepare and submit to EHD a site conceptual model (SCM) that includes <br /> maps and cross sections that clearly show the site geology, known <br /> contaminant sources, migration pathways and current contaminant <br /> distribution. Known UST-related contamination should be clearly <br /> demarcated from known non-UST-related contamination; areas of <br /> uncertainty should be noted as such. If the UST-related contamination <br /> cannot be clearly delineated, a work plan to continue the site <br /> characterization should be submitted. <br /> • Submit a work plan to characterize groundwater in the immediate and <br /> down-gradient direction of the former UST pit. <br /> • Submit all required site information to Geotracker immediately. <br /> AGE has submitted a MW destruction permit application for the three on-site <br /> MWs. EHD will not issue a permit until all work is completed and site closure is <br /> granted. Please note that a site closure given by EHD will apply only to the UST- <br /> related impact and not to any non-UST-related contamination. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at <br /> (209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Nuel Henderson, PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> Cc: SWRCB-Cleanup Fund <br /> CVRWQCB - James Barton <br /> AGE - Bill Little <br />