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r <br /> r <br /> r <br /> r <br /> EI utilized the groundwater measurements to determine the direction of groundwater flow and <br /> the groundwater gradient present beneath the site The groundwater direction of flow was <br /> r calculated to be southeasterly at a gradient of 0 0112 ft/ft (Figure 3) <br /> r <br /> 3.0 SCOPE OF WORK <br /> The purpose of this investigation is to extend the work completed in 1997 (Used Oil USTs) and <br />• <br /> in 1999 (Diesel USTs), and to determine the vertical and lateral extent of contamination from <br /> r <br />. these two sources of contamination, where the prior work failed to provide adequate definition <br />. Impacts to the soil and groundwater in the vicinity of the former diesel USTs were assessed A <br /> California licensed drilling contractor (V & W Drilling) was lured to advance two (2) soil <br /> r borings, collect soil samples and construct one (1) groundwater monitoring well at the locations <br /> r indicted in Figure 4 Excavation, logging and sampling of two (2) soil borings was completed in <br /> the vicinity of the former UST excavation on 5 October 2000, and excavation, logging and <br /> sampling of one (1) soil boring and construction of one (1) groundwater monitoring well was <br /> r <br />. completed down gradient from the former used oil UST on 7 November 2000 A Geologist, <br /> registered to the State of California, completed logging of the borings Soil samples were <br /> collected in each of the three (3) soil borings Twelve (12) soil samples were analyzed as <br /> r described below for petroleum hydrocarbons The new groundwater monitoring well was <br /> developed by surging and purging on 7 November 2000 Ms Carol Oz of the San Joaquin <br />• County Public Health Services Department witnessed this work Top of well casing elevations, <br /> r <br /> in relation to mean sea level, were established on 7 December 2000 by Kier & Wright Civil <br />. Engineers and Surveyors (Appendix D) <br />• Finally, the analyses of the soil samples and groundwater were obtained, and the Report of <br />• Investigation was completed <br /> r <br /> r <br /> 3.9 Field Preparation <br /> r An encroachment permit for the monitoring well was obtained from San Joaquin County USA <br /> Alert was notified along with Cal Tk so that all underground pipelines, cables, wires, etc could <br /> i be located Also, the site was inspected for overhead lines Field preparations at the site <br /> r <br /> included a pre-construction meeting between Environcenng, Inc and the drilling contractor <br />• Environeenng,Inc Project No 00-01108 $ <br /> r <br /> r <br /> r <br />