ARCHIVED REPORTS_2014_2 - Laserfiche WebLink

Home Browse Search

B September 24 2013 the extension of the closure By p cap was complete, with the exception of hydroseeding. On September 30, 2013,the County submitted the Certification Report for the Closure Cap Extension project. 1 On or about October 24, 2013,hydroseeding was completed,thereby concluding construction activities. In a letter dated March 10, 2014, RWQ CB staff transmitted their review of the Certification Report. This letter called into question whether construction had proceeded in accordance with several key aspects related to the integrity of the low-density polyethelene closure membrane, including the thickness of the vegetative layer when placed,the particle size allowed in that cover layer, and the relative density of that cover layer. This concern was based on several statements made in the Certification Report. With the exception of the relative density of the vegetative layer,these statements incorrectly reported actual construction. The specifications for the relative density of the vegetative layer were not clear. The County responded to the March 2014 letter in a letter report dated May 14, 2014, with revised sections of the Certification Report attached. This letter report documented that the thickness of the vegetative layer when placed and the particle size in that cover layer met the Contract specifications. This letter report also documented that the integrity of the closure membrane was not compromised during construction. MONITORING GA Water quality is monitored in accordance with WDR Order No. R5-2013-0013 and the monitoring program approved by the Regional Water Quality Control Board. Water purged from wells prior to sampling is disposed of to the ground around the wells, away from surface drainage features. This is a common practice when the water sampled is non-toxic, as at CHSL. Progress of Corrective Action Measures is submitted twice yearly (during 1st and 3rd quarters), documenting the effectiveness of current corrective action measures. Groundwater The groundwater monitoring network consists of nine monitoring wells: seven monitoring the shallow aquifer perched on the Corcoran clay layer east of the CHSL, and two monitoring the deep aquifer. Groundwater samples are analyzed for the following quarterly field and monitoring parameters as specified in WDR Order No. R5-2013-13: Corral Hollow Sanitary Landfill 9 Department of Public Works/Solid Waste 2nd Quarter 2014 Groundwater Monitoring County of San Joaquin—July 15,2014