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;slf <br /> 1 <br /> WELL DRILLING <br /> In April 1986, Groundwater Technology Inc. developed and <br /> submitted for regulatory review a proposed work plan to implement <br /> a preliminary site assessment investigation. The work plan <br /> included the installation of four monitoring wells and was <br /> approved prior to implementation. Installation of five additional <br /> rw <br /> ii monitoring wells was conducted after review of a second proposal <br /> submitted May 15, 1986. Groundwater Technology Inc. obtained <br /> permits for the monitoring well installations from the San <br /> Joaquin Local Health District. Encroachment permits were obtained <br /> ^� from the Department of Public Works for wells located in the city <br /> s " right of way. <br /> .: Groundwater Technology Inc. contracted Sierra Pacific to <br /> bore and install the groundwater monitoring wells. The well <br /> installations were conducted in accordance with Groundwater <br /> Technology's Standard op_rating Procedure 13 ;Appendix II). <br /> The approximate locations of the nine monitoring wells at the <br /> site are shown on the Monitoring well Location Map (Figure 7). <br /> r p SOIL SAMPLING AND ANALYSIS <br /> Soil samples from the nine monitoring well borings at the <br /> ! ! site were collected, preserved and field analyzed for organic <br /> .� <br /> vapors using an HNU photoionization detector (PID) in accordance <br /> with Groundwater Technology's Standard Operating Procedures <br /> `- 11, 14 and 15 (Appendix II). The borings were logged by visual <br /> inspection of both the drill cuttings and soil samples collected <br /> at regular five foot intervals. The samples were classified <br /> i, according to the Unified Soil Classification System (Appendix I) <br /> and were inspected for discoloration and odors due to hydrocarbon <br /> contamination. The sample drive blow counts, sample reference <br /> number, and PID readings were recorded in the field with soil <br /> 13 <br />