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Pagc 1 of 1 <br /> Nuel Henderson [EH] <br /> From: Nuel Henderson [EH] <br /> Sent: Tuesday, April 29, 2008 3:25 PM <br /> To: 'ktlarson@waterboards.ca.gov' <br /> Cc: Margaret Lagorio [EH]; Lori Duncan [EH] <br /> Subject: 5-Yr Review 640 N EI Dorado Street <br /> Kirk, <br /> In the opinion of the San Joaquin County Environmental Health Department, this site requires a bit more work <br /> before closure consideration. The EHD has directed that the following issues be addressed: <br /> 1) Quarterly monitoring must be resumed, the last monitoring event was conducted 2nd quarter 2006 and was <br /> discontinued without EHD concurrence; <br /> 2)The presence or absence of free product in monitoring well MW-3 must be demonstrated; <br /> 3)Groundwater samples from MW-3 have been analyzed for TRPH by EPA 418.1, the analysis was dropped in <br /> all other wells after four or fewer analyses with detection limits ranging from 1,000 to 10,000 micrograms per liter. <br /> The EHD has directed that at least one round of analyses utilizing EPA Method 1664A be conducted to ensure <br /> the absence of the hydrocarbons; <br /> 4)As the former UST and system was located in a warehouse, the potential for vapor intrusion must be <br /> evaluated; <br /> 5) Residual contaminants must be evaluated by comparison with Region 2 ESI-s. <br /> A work plan has been received and approved to investigate the vertical extent of impacted groundwater and to <br /> evaluate the potential for vapor intrusion. <br /> Let me know if you need any additional information. <br /> Nuel Henderson <br /> (209)468-3436 <br /> 4/29/2008 <br />