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11 1 <br /> onsite domestic water supply well was sampled for TPHg, benzene, MtBE, and oxygenates, all of which were <br /> reported below laboratory detection limits Groundwater flow direction was variable to the north-south at an <br /> approximate gradient of 4 011 to 0 026 ft/ft <br /> ATTACHMENTS- <br /> Table 1 - Groundwater Elevation and Analytical Data <br /> • Table 2- Historical Groundwater Gradient Data <br /> • Table 3 - Oxygenates by EPA Method 8260 <br /> + Figure 1 - Groundwater Elevation Contour Map <br /> • Figure 2- Groundwater Concentration Map <br /> • Attachment A - Field and Laboratory Procedures <br /> • Attachment B -Certified Analytical Reports, Chain-of-Custody Documentation, and Field Data Sheets <br /> cc Mr Marty Hartzell, Regional Water Quality Control Board <br /> Ms Lori Duncan, San Joaquin County Environmental Health Services <br /> Ms Madeline Scannavino, 5463 Cherokee Road, Stockton, CA 95205 <br /> i <br />