Laserfiche WebLink
Mr. Robert McClellan <br />September 12, 2008 <br />Page 3 <br />Well Depth Requirements — 20925(c) <br />This section was modified to stipulate that wells shall be installed to the maximum depth of the <br />waste at the site, as opposed to the previous requirements to install probes to the maximum depth <br />of waste within 1,000 of the proposed probe location. Table 1 contains a summary of the depths <br />of the existing and planned monitoring wells at Forward. <br />The well depths at Forward comply with depth requirements set forth in the regulation. All wells <br />were installed with shallow, mid, and deep probe sections, as required by Section 20925(c). <br />Monitoring Well Construction — 20925(d)(3) <br />To isolate monitored zones within the wellbore and prevent the contamination of perched <br />groundwater and permanent groundwater, a minimum of five feet of bentonite is required at the <br />surface and between the monitored zones to provide a seal. <br />Each well at Forward is constructed in accordance with Section 20925 (d)(3). <br />Section 20937 — Reporting and Control of Excessive Gas Concentrations <br />This section was modified to pertain specifically to reporting and control of gas readings in <br />excess of compliance requirements, according to the following schedule: <br />1. Immediate action and notification to the LEA by telephone or electronic means. <br />2. Within 7 days <br />a. Verify validity of results <br />b. Place a description of the event in the operating record and notify LEA in writing. <br />3. Within 60 days submit a remediation plan <br />Forward is aware of this modification and is already conforming to the revised regulatory <br />requirements for reporting. <br />As discussed in the previous Section of this letter and as shown on Figure 1 and Table 1, the <br />Forward Landfill Perimeter Probe Monitoring System is in compliance with the revised Title 27 <br />requirements, with the exception of the spacing of the four probes indicated on Table 1 as <br />`Marginal'. The distance to adjacent wells for these four wells was determined to range from <br />1,000 feet to 1,010 feet. Because of the small exceedences of the spacing limit and the <br />agricultural land use on adjacent properties, particularly to the east and west, where the four <br />