Groundwater Flow. 6-6 APPENDICES APPENDICES VOLUME I APPENDIX A: Data Collection and Laboratory Forms - Well Data Sheet Form - Tedlar Bag Sample Quality Control Sheet - McLaren Analytical Laboratory Chain of Custody Record - Request for Laboratory Analysis APPENDIX B: Lithologic Logs and Well Construction Details APPENDIX C: Soil Vapor Laboratory Reports APPENDIX D: Soil Laboratory Reports APPENDICES VOLUME II
Groundwater Flow. Characterization A site wide survey was conducted to characterize the groundwater flow direction beneath the entire 85-acre site. The survey involved measuring groundwater elevations and the top of casing elevations at all 24 wellx xx site. Groundwater elevations in mean sea level (MSL) were calculated and are presented along with well construction details in Table 15. Note that well UGP-1, constructed south of the landfill, is an artesian well. The completion zone (shallow, deep, or refuse material) for each of the 24 wellx xx also presented in Table 15. Nineteen wellx xxx screened in the first saturated zone; of these, seven wellx (X0A, P2A, X-0X, X-0, X-0X, X-0X, xxd S-5) are screened in the refuse material. A contour map constructed using the 19 shallow groundwater elevations is shown in Figure 6. The remaining 5 wellx (X-1B, P-2B, UGP-1, MW-1 and MW-2) are screened at deeper intervals. Wellx [FIGURE 6 CONTOUR MAP OF SHALLOW GROUNDWATER ELEVATIONS] This diagram depicts the snail-shaped Westport Office Park area, and identifies 29 well locations across the site. Four arrows show the direction of groundwater flow. 150 X-0X, X-0X, XX-0, xxx XX-0 xxxe constructed beneath the refuse material; well UGP-1 is off-site. A contour map based on the groundwater elevations of these deeper wellx xx depicted in Figure 7.
Groundwater Flow. The direction of groundwater movement at the site as determined by the well casing top elevation survey and the depth-to-water measurements is similar to the direction of movement described by Levixx-Xxxxxx. Xxallow groundwater elevations are generally highest in the refuse material and are lower around the perimeter of the site. Therefore, shallow groundwater moves north and west from the refuse mound and panhandle areas towards the Belmont Slough. Shallow groundwater also moves southward from the panhandle area towards Marine Parkway. Sandx xxxers beneath the shallow groundwater are not laterally continuous. Accordingly, the wellx xxx screened at different depths and do not appear to be screened in the same sandx xxxer. Therefore, the flow direction in an individual sandx xxxer has not been determined. Water level data for he deeper groundwater suggest that groundwater flows north and west toward the Belmont Slough. However, regional hydrogeology, suggests that deeper groundwater could potentially move in a easterly direction towards San Francisco Bay. It would be appropriate to include the three new groundwater wellx xxxstructed by McLaren (MW-1, MW-2, and MW-3) in any on-going water quality monitoring programs to further aid in guaging groundwater quality and flow. 165 REFERENCES California Air Resources Board, 1986. Testing Guidelines for Active Solid Waste Disposal Sites. Stationary Source Division, Toxic Pollutants Branch. December 18. California Department of Health Services (CDHS), 1989. DHS Applied Action Level List, August 9, 1989. Technical Services Unit, Toxic Substances Control Program. pp.6. Coopxx Xxxineers, 1983. Report - Geotechnical and Waste Management Engineering Studies for Approval of Concept Plan Lands of Parkwood 101 Associated Redwood City, California for Parkwood 101 Associates. September 16.
