ARCHIVED REPORTS_2013_1 - Laserfiche WebLink

Home Browse Search

Evaluation of Impact to Groundwater by Off-Site Wastewater Treatment Ponds A review of the general chemical constituents indicates that the treatment ponds appear to act as a source of constituents in groundwater. In all cases, constituents are lower in background well MW-6, then rise in well MW-5, and then fall in well MW-4A (see table below). Monitoring Wells Constituent MW-6 MW-5 MW-4A (Newly installed (Newly installed (downgradient) upgradient) South of ponds North of MW-4) EC (us/cm) 291.5 931.6 573.4 Calcium (mg/L) 21 89 14 Magnesium (mg/L) 11 50 8.8 Alkalinity(as CaCO3, 92 410 140 mg/L) Hardness (as CaCO3, 95 430 72 mg/L) Surface Water As noted in the cover letter of the First Semester report, Surface water samples are no longer taken at this site. CCR Title 27 Section 20415 (c) "Surface Water Monitoring Systems" paragraph (1) "General' requires that "The discharger shall establish a surface water monitoring system to monitor each surface water body that could be affected by a release from the Unit.". The physical configuration of the landfill, retention pond, and the "surface water" (drainage ditch south of the retention pond) makes reaching the drainage ditch by sheet flow from the landfill impossible. Storm Water There were no storm water discharges to the waters of the State during this reporting period. Such discharge requires the manual operation of the pumps in the retention basin to pump into the drainage ditch. Landfill Gas The Monitoring and Reporting program for the landfill requires semi-annual VOC testing by TO-15 analysis. Soil gas samples were collected on August 2, 2013, and is included in this second semester report. Soil gas samples were collected in 1-liter Summa canisters and sent for VOC analysis by EPA method TO-15. Harney Lane Sanitary Landfill 8 Department of Public Works/Solid Waste 2nd Semester and Annual 2013 Groundwater Monitoring Report County of San Joaquin—January 31,2014