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' A chain of custody document, listing all samples collected, accompanied the samples from <br /> field to laboratory, thereby providing a means to track their movement and to insure their <br /> ' integrity <br /> 4.4 Surveying and Water Level Measurement <br /> Following completion of the wells the location and top-of-the-casing elevation of each well <br /> ' was established relative to an established bench-mark by a California licensed surveyor <br /> Water level measurements were made using an electronic Solinst water Ievel recorder The <br /> ' elevation of the water table was subsequently determined by subtracting the depth to water <br /> from the elevation of the top of the casing As a result, the direction of groundwater <br /> ' movement and relative gradient has been determined Figure 4 shows the approximate <br /> contoured elevation of the water table and the direction of groundwater movement A <br /> ' copy of the surveyor's report is provided in Appendix 3 <br /> 1 <br /> 11 <br />