Laserfiche WebLink
it <br /> Mr. <br /> Wes Johnson - 2 - 1 gAugust 1999 <br /> 4. Appendix G of the report includes the certification of weekly standard observations. You have <br /> indicated that two areas of differential settlement have been noted on the landfill cover surface. <br /> You have also reported that repairs will be made during the summer of 1999. Please inform this <br /> office of your proposed mitigation methods prior to undertaking repairs. As the county is aware, <br /> maintenance of the landfill cover to correct the effects of settlement and to prevent ponding is <br /> required under the California Code of Regulations, Title 27, Section 21090, Closure and Post- <br /> Closure Maintenance Requirements for Solid Waste Landfills; and the Code of Federal <br /> Regulations, 40 CFR 258.61, post-closure care requirements. Additionally, the California Code <br /> of Regulations [CCR Title 27, Article 2, Section 21090(b)(1)(E)] states that the repair work to <br /> the low-hydraulic-conductivity layer shall be carried out in accordance with an approved <br /> Construction Quality Assurance (CQA)plan. Correction of this settlement is requested prior to <br /> 31 October 1999. <br /> Attached is a flow diagram that illustrates the steps detailed in Title 27 for responding to a release. <br /> Because the initial response to a release calls for a retest of the subject wells,please submit the retest <br /> results by 30 September 1999. In accordance with Title 27, the Regional Board is requesting that San <br /> Joaquin County submit an amended Report of Waste Discharge proposing an Evaluation Monitoring <br /> Program that will adequately delineate the lateral and vertical extent of the release. The submittal is due <br /> by 20 November 1999. Until Evaluation Monitoring WDRs are approved, monitoring shall continue <br /> according to WDRs 96-139. <br /> If you have any questions regarding these comments, please telephone Wendy Arano at (916) 255-3140. <br /> VICTOR J. ZO <br /> Senior Engineering Geologist <br /> Attachment <br /> cc. Robert McClellon,REHS, Public Health Services, Environmental Health Division <br /> WWA <br /> C:\mydocuments\sanjoaquin\hameyln\2Q991trI <br /> P <br /> .l <br />