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Mr. Sam Savig <br /> C A B R I A September 24, 2001 <br /> EXTENT OF HYDROCARBONS IN GROUNDWATER <br /> During the June 19, 2001 meeting with the Public Health Division of San Joaquin County Public <br /> Health Services, Equiva was asked to assess the horizontal and vertical extent of hydrocarbons at <br /> the site. <br /> Horizontal Extent of Hydrocarbons in Groundwater: The horizontal extent of hydrocarbons in <br /> groundwater appears to be defined at this site. Groundwater monitoring wells MW-2, MW-3, <br /> MW-5A and B, and MW-6A and B do not have detectable levels of hydrocarbons, and are <br /> located to the west, north, northeast, and east of the source area, respectively. The extent of <br /> hydrocarbons is defined to the south by non-detection in samples collected from CPT borings <br /> CPT-13 and CPT-14. <br /> Vertical Extent of Hydrocarbons in Groundwater: The vertical extent of hydrocarbons in <br /> groundwater appears to be defined by deeper zone groundwater monitoring wells MW-4A, <br /> MW-5A, and MW-6A. Wells MW-5A and MW-6A do not contain hydrocarbons, and well <br /> MW-4A contains MTBE at a concentration of 7.2 ppb. <br /> CLOSING <br /> We appreciate the opportunity to work with you on this project. Please call Owen Ratchye at <br /> (510)450-1984 if you have any questions or comments. <br /> �4 Sin <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> � z <br /> XenE e}r <br /> Senior Project Engineer d"� <br /> C► 1t <br /> Figures: i - Groundwater Elevation Contour Map - Zone A �p OF CA1.����� <br /> 2 - Groundwater Elevation Contour Map -Zone B <br /> Tables: 1 - Groundwater Extraction System - System Analytical Results <br /> 2 - Groundwater Extraction System-Mass Removal Calculations <br /> Attachments: A- Blaine Groundwater Monitoring Report and Field Notes <br /> B - GWE System Analytical Results <br /> cc: Karan Pe—yna 17—i-, Q—irve Y T C P 0 Rnv 7RFQ Rirlhnnlr C4 41510-7R(4 <br /> Marcus Pierce, RWQCB 3443 Routier Road, Sacramento, CA 95827-3098 <br /> Robert G. den Dulk, 2412 Avenue 360, Kingsburg,CA 93631 <br /> Dale Ramey, City of Ripon, 259 North Wilma Avenue, Ripon, CA 95366 <br /> Michele Dias, Herum, Crabtree, Brown 2291 West March Lane, B 100, Stockton, CA 95207 <br /> g;lripon341 mainlgml3q 0 L q m.doc <br /> 3 <br />