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540 West Scotts Av*e • August 4, 1997 <br /> Project 9644 Page 5 <br /> and stabilized material will be removed and disposed at a suitable facility after <br /> ' characterization,profiling and acceptance. <br /> 3.4 Groundwater Monitoring and Sampling <br /> ' The depths to groundwater levels from the surveyed casing top will be measured <br /> using an electronic water meter accurate to 0.01 foot After depth to water <br /> measurements are recorded, groundwater monitoring wells MW-1 MW-2, and <br /> MW-3 will be purged of approximately three well volumes of water or until the <br /> pH, conductivity and temperature have stabilized indicating formation water has <br /> entered the wells. Groundwater samples from each monitoring well will be <br /> placed into laboratory provided containers using disposable bailers. Each <br /> groundwater sample will be properly labeled with the sample number, date and <br /> time of collection and sampler initials. Groundwater samples will be placed on <br /> frozen water in an insulated cooler. A chain-of-custody form will be filled out to <br /> document the groundwater sample collection and will be kept with the samples <br /> ' until relinquished to a California certified laboratory for analyses. <br /> Groundwater samples will be analyzed for: <br /> Lead by EPA Method 200.7 <br /> Zinc by EPA Method 200.7 <br /> The laboratory will be requested to perform all analyses with detection limits at <br /> least as low as the Regional Water Control Board maximum contaminate levels <br /> (MCLs) for drinking water of 0.015 ppm and 2 ppm for lead and zinc, <br /> respectively. <br /> Using the depths to groundwater, the casing elevations and the horizontal <br /> positions of the three groundwater monitoring wells, a site specific groundwater <br /> gradient will be calculated and presented in the report in graphic and <br /> mathematical form. <br /> 4.0 REPORT <br /> ' Results of the subsurface investigation will be provided to DTSC and will include <br /> a description of the work performed, laboratory analytical results, a groundwater <br /> gradient, site specific maps and figures, photographs, and a boring log. The site <br /> ' plan, groundwater gradient plan and any other site specific figures will be drawn <br /> to scale. Conclusions will be based on the data collected during the re-evaluation <br /> investigation and historical data. Specific conclusions regarding the conditions <br /> and performance of the asphalt cap will be made. Recommendations will be <br /> made based upon the conclusions and will include the need for and frequency of <br /> WILLIAM DUBOVSKY ENVIRONMENTAL <br /> Environmental Consulting ♦ Project Management <br />