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California Ronal Water Quality Cont of Board <br /> Central Valley Region C t <br /> Katherine Hart, Chair <br /> rrrr1111 �r�Ir�,rd� Brown Jr. <br /> Linda S.Adams 11020 Sun Center Drive#200, Rancho Cordova,California 95670-6114 RE��� or <br /> Acting Secretary for Phone(916)464-3291 -FAX(916)464-4645 <br /> Environmental Protection http:/twww_waterboards.ca.gov/centralvalley <br /> r-Ea o 7 zott <br /> 3 February 2011 <br /> ENVIRONMENTAL <br /> S <br /> RVIC SL <br /> Mr. Gil Moore <br /> P.O Box 529 <br /> Wilton, CA 95693 <br /> DOCUMENT REVIEW, NEW WEST PETROLEUM #1003 (AKA FLAG CITY SHELL), <br /> 6437 NORTH BANNER STREET, LODI, SAN JOAQUIN COUNTY, CLEANUP AND <br /> ABATEMENT ORDER R5-2007-0709, GENERAL NPDES PERMIT R5-2008-0085-013 <br /> (CASE 391163) <br /> 1 reviewed the Fourth Quarter 1010 Groundwater Monitoring and NPDES Report (Report), <br /> received 2 February 2011 from your consultant Advanced GeoEnvironmental, Inc. The Report <br /> states groundwater was sampled on 27 December 2010; however, monitoring wells MW-9B, <br /> g event. <br /> MW-9C, and MW-9D were inadvertently not sampled during the <br /> 13abgs�nithenmon monitoring <br /> Depth to water varied from 11 feet below ground surface 0 ft <br /> ) <br /> wells. Groundwater flow direction varied from east at 0.003 ft/ft gradient to radially inward <br /> towards the groundwater extraction wells EW-6A and EW 7A in Zone A, and east-southeast at <br /> 0.001 to 0.003 ft/ft gradient in Zone B. Maximum groundwater concentration in MW 8A was <br /> methyl tett butyl ether (MTBE), 140 micrograms per Liter (ug/L); however, MW-6B located in <br /> Star Street (next to EW-8B) increased from non-detect in November 2009 to MTBE, 93 ug/L. <br /> The groundwater extraction treatment system (GWETS) treated approximately 2,823,500 <br /> gallons of extracted groundwater and removed 0.5 pounds of MTBE during the fourth quarter <br /> of 2010 under Regional Water Quality Control Board — Central Valley Region, General Order <br /> No. R5-2008-0085, Waste Discharge Requirements for Discharge to Surface Waters of <br /> Groundwater from Cleanup of Petroleum Fuel Pollution (R5-2008-0085). Influent GWETS <br /> concentrations have declined to non-detect (<0.5 ug/L) for MTBE, while operating extraction <br /> petroleum <br /> well concentrations have dropped to a maximum 23 ug/L for MTBE (EW-6A). <br /> Total hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes were not <br /> detected in the influent treatment system sample collected on 29 November 2010. Receiving <br /> waters bioassays for R5-2008-0085 reported a 98% Fathead minnow survival for acute <br /> analysis, and a 100% survival (3 species) for chronic analysis. The Report recommends: <br /> • Continue quarterly water level measurements for all monitoring wells, <br /> • Reduce the semi-annually monitoring event to annual, since semi-annual sampling of wells <br /> EW-4 and EW-5 is not cost effective, <br /> • Evaluate the monitoring program annually, (with latest <br /> Continue operation of the GWETS using the following extraction 9/��and EW ggMTBE <br /> • concentrations): EW-6A (23 ug/L), EW-7A (7.1 ug/L), <br /> (21 ug/L), <br /> • Continue <br /> samplesfor <br /> collection <br /> R5-2008-0085 013 analysise and MTBE analysis of MID1 , MID- , <br /> and effluent <br /> California Environmental Protection Agency <br /> ORecycled Paper <br />