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1 <br /> CIVIC Center Square <br /> 2444 Main Street Suite 215 <br /> Fresno California 93721-2734 <br /> (559} 264-2535 o FAX (559) 2647439 GEDMAMIX <br /> September 11, 2001 <br />' Project 006437 <br /> Mr Jay R Jahangm <br />' Director of Environmental and Regulatory Affairs <br /> Port of Stockton <br /> P O Box 2089 <br />' Stockton, California 95201-2089 <br /> Subject Work Plan for Assessing Lateral and Vertical Extent of Petroleum Hydrocarbons in <br />' Soil and Groundwater <br /> Site No 3 (Sate Code 1282-124) —Port of Stockton <br /> Dear Mr Jahangm <br />' This work plan has been prepared on behalf of the Port of Stockton (Port) at your request to <br /> P P P <br /> respond to the June 14, 2001 letter from Ms Margaret Lagono of the San Joaquin County Public <br />' Health Services, Environmental Health Division (PHS/EHD) In that letter, the PHS/EHD <br /> indicated that they have reviewed the quarterly reports submitted by the Port, which document the <br /> groundwater monitoring conducted at Site No 3 Based on their review, PHS/EHD determined that <br />' soil contamination has been defined vertically at the site, but not laterally, and that groundwater <br /> contamination has not been defined laterally or vertically They concluded that further site <br /> investigation is required and requested that the Port submit a work plan to investigate the extent of <br /> contamination in the soils and groundwater in the vicinity of the site <br /> On July 25, 2001, the Port met with representatives from PHS/EHD and the Regional Water <br />' Quality Control Board, Central Valley Region (CVRWQCB) to discuss an appropriate scope of <br /> work for the investigation The discussion included a summary of the findings to date, which <br /> highlighted the variability in groundwater gradient direction, the relative stability in petroleum <br />' hydrocarbon compounds in the momtonng wells, and the lack of methyl tertiary butyl ether <br /> (MTBE) in the groundwater samples This work plan reflects the discussions at that meeting <br /> including the need to assess the extent of groundwater contamination in multiple directions, the <br />' need to assess the lateral and vertical extent of groundwater contamination using monitoring wells, <br /> and the logistical constraints dictated by the industrial environment surrounding the former source <br /> area (underground storage tanks) <br /> If you have any questions on the attached work plan, please call me at (559) 264-2535 <br />' Sincerely yours, <br /> GEO CONSULTANTS, INC <br /> \S��RED GE <br /> Philip Ross, R G No 4155 <br />' Senior Hydrogeologist * Exp <br /> • Enclosure OF <br /> I 28(mir at-ri i QooQ' suftenTs. Onc. <br /> Engineers Geologists and Environmental Scientists <br />