ARCHIVED REPORTS_2003_4 - Laserfiche WebLink

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1 On November 6, 2002, the County submitted an Evaluation Monitoring Plan,which proposed methods to delineate the nature and extent of groundwater pollution. The Plan included a step-out 1 step-down approach if groundwater contamination was detected. 1 On January 30, 2003, WDRs were issued by the California Regional Water Quality Control Board, Central Valley Region(CVRWQCB). These WDRs required the closure of Module"I" as corrective action because Module"I"is unlined and assumed to be the source of contamination. These WDRs also required the monitoring of soil gas for VOCs. Monitoring for VOCs in the soil ! gas had not previously been required. In June 2003, the Evaluation Monitoring Program was completed. No groundwater contamination 1 was found. On September 16, 2003, due to delay in submitting the results of the Evaluation Monitoring Plan, ! the CVRWQCB issued a Water Code Section 13267 Order_ This Order required that the County submit the results of the Evaluation Monitoring Program and an Engineering Feasibility Report 1 that"includes closure of Module `I"'. On October 30, 2003,the County submitted a final Engineering Feasibility report to the CVRWQCB presenting the results of the Evaluation Monitoring Program. Corrective action, including closure of Module"I",was not proposed due to lack of groundwater contamination. On December 16, 2003, an Administrative Civil Liability Complaint was issued by the CVRWQCB for"not submitting a Closure Plan for Module `I"'. ! Negotiations in January 2004 resulted in a Clean Up and Abatement Order which requires the County to initiate the Foothill Landfill Site Improvement Project,which includes the following components: ! s Final closure of the crest of Module"I" Installation of a barrier between Module"I"and future refuse placed over the Module"I" 1 footprint made possible by the construction of Module 1 Landfill gas collection system Partial Cover of those surfaces.of Module"I"that are not covered by the inter-Module 1 barrier or final closure Two groundwater monitoring wells ! This project is to be pursued in lieu of complete closure of Module"I". On January 30, 2004, the County submitted the Second Semester and Annual 2003 Groundwater 1 and Surface Water Monitoring Report. That report included all soil gas data available at that time, which indicated that VOCs were detected in the soil gas in all soil gas wells, generally at concentrations less than 100 ppb (v/v). This report did not include a discussion of those data. ! Foothill Sanitary LandfillDepartment of Public Works/Solid Waste 2ND Semester/Annual 2003 Groundwater Monitoring 3 County of San Joaquin-Revised June 29,2004 1