ARCHIVED REPORTS_2012 - Laserfiche WebLink

Home Browse Search

® Concentrations of major gasses (Methane, Carbon Dioxide, and Oxygen) and pressure were measured using a CES-LANDTEC GEMTm2000 portable gas detector on August 7, 2012. GROUNDWATER DIRECTION AND FLOW RATE The general direction of groundwater flow, determined from the elevations of water in the groundwater wells, is to the south, and was consistent between quarters (Figure 2 and 3). Groundwater flow velocity was calculated to be about 70.9 feet per year with a gradient of 0.00210 foot per year during the third quarter 2012. Groundwater flow velocity was calculated to be approximately 71.6 feet per year with a gradient of 0.00212 foot per year during the fourth quarter 2012. (Appendix G). STANDARD OBSERVATIONS The site was inspected monthly throughout the monitoring period (Appendix H). The information on the original field form was transcribed for legibility. The original forms with signatures can be forwarded upon request. RUN-OFF/RUN-ON FACILITIES General The HLSL utilizes a single facility to control run-off and run-on: a perimeter berm/road surrounding the site, which generally prevents any water from entering the site. Water drains ® from the landfill property to the retention pond. A discharge to the Waters of the State occurs when water is discharged from the retention pond. No water was discharged at any time this past winter. The discharge pumps are not active unless manually activated by Solid Waste staff. ANNUAL MONITORING SUMMARY REPORT In accordance with provision G.2 of the WDRs, the Annual Report shall include the following: a. Tabular and graphical summaries of the results of the prior year, including, representative time series plots and contaminant contour maps. This is included in Appendix F. b. A summary of the results of trend analysis performed on each constituent of the release during the prior year. This is included in Appendix D. c. A summary of the results of water chemistry analysis of water quality data collected during the prior year. This is included in Appendix E and below. d. A summary of the changes in plume and/or groundwater geochemical conditions since initiation of corrective action, based on analysis such as comparison of previous contaminant contour plots. This is provided throughout the text and in Appendix F. e. A copy of the Sample Collection and Analysis Plan. This is included in Appendix A. f. Electronic copies of the following on compact disk: Harney Lane Sanitary Landfill 9 Department of Public Works/Solid Waste 2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin—January 25,2013