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Mike Infurna [EH] <br /> From: Laurie Cotulla [EH] <br /> Sent: Friday, September 16, 2005 2:41 PM <br /> To: 'swinkler@co.san-joaquin.ca.us' <br /> Cc: rrall@co.san-joaquin.ca.us'; Donna Heran [EH]; Margaret Lagorio [EH] <br /> Subject: New West, Lodi (Flag City) Regional Board contract laboratory analytical results <br /> Steve: <br /> I wanted to let you know that we have received confirmation analytical results from the monitoring wells installed by New <br /> West Petroleum to investigate the suspected MtBE contamination plume at Flag City(CSA-31). As discussed when we <br /> met last month, our office had directed New West to perform an expedited groundwater investigation to determine if the <br /> previously detected MtBE contamination was moving toward the CSA-31 water supply wells. We received preliminary <br /> analytical results from New West last week,which were confirmed by split samples analyzed by the RWQCB. <br /> The following information is excerpted from an email we received today from Jim Barton with the RWQCB: <br /> On Monday, 12 September 2005 I sampled San Joaquin County public supply well CSA-31 <br /> Well 2. All results from CSA-31 Well 2 for fuel oxygenates were non-detect at <br /> acceptable method detection limits. <br /> I also received split samples from Apex (New West's consultant) for downgradient New <br /> West monitoring wells MW-4A and MW-4B . Shallow well MW-4A groundwater analysis was <br /> non-detect. Deeper well MW-4B groundwater analysis reported MtBE at 400 ug/L This <br /> confirms the 360 ug/L previously reported for that well. <br /> . .I strongly concur with your recommendation that New West expedite the <br /> installation of additional monitoring wells between MW-4A/MW-4B and CSA-31 Well 2. <br /> CSA-31 Well 2 is approximately 600 feet downgradient from MW-4B. The New West MtBE <br /> plume is undefined in the downgradient direction and appears to be diving towards CSA- <br /> 31 Well 2. I suggest that New West begin monitoring CSA-31 Well 2 . <br /> I will fax a copy of my analytical results to you. Apex said that their analytical <br /> results should be available next week. <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> office (916) 464-4615 <br /> fax (916) 464-4704 <br /> Margaret Lagorio and her staff are drafting a letter directing the Responsible Party to <br /> submit a work plan for interim remediation and further investigation of the lateral and <br /> vertical extent of the contamination within one month, and to initiate interim remediation <br /> as soon as possible. <br /> You will be copied on the directive letter, and we will keep you informed as more <br /> information becomes available. Please contact Margaret or me, if you have any questions. <br /> Otherwise we will be in touch. <br /> Laurie A Cotulla <br /> EH Program Manager <br /> San Joaquin County EHD <br /> 304 E Weber Ave-3rd Floor <br /> Stockton CA 95202 <br /> (209)468-3431 <br /> Icotulla@sjcehd.com <br /> 1 <br />