ARCHIVED REPORTS_2006_21 - Laserfiche WebLink

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Ms. Christina Carbajal June 6, 2006 Page 4 degrees Fahrenheit flare exit gas temperature) at the BFS and to help maintain/decrease methane gas concentrations at perimeter monitoring probes to below the LEL. SCS will continue to monitor and adjust all LFG extraction wells to minimize the amount of overpull while maintaining operational criteria. Also, on May 5, 8, 13 and 23, 2006, SCS continued monitoring/adjustment to, recently installed by others, LFG Extraction Well Nos. FOFU-0304- Well, FOFU-04-06 through FOFU-04-12, FOFU-HCO1,FOFU-04-LCR, FOFU-05-06 and FOFU-05HC1 in attempts to maintain the observed methane gas concentrations detected at GP-11 and GP-12 to below the LEL as directed by the client. SCS will continue to adjust wells as directed by Allied personnel. Finally, during this reporting period, temperatures at LFG extraction wells were monitored and observed to range from 65 to 97 degrees Fahrenheit(see Table 2). These temperatures are considered to be in the low to normal range for anaerobic decomposition. SCS will continue to test LFG temperatures at each extraction well on a monthly basis in order to develop a database. This additional information should provide a better understanding of subsurface conditions at the site. LFG Collection System Visual observation of the LFG collection system is conducted twice per month. During these visits, observations are made to ensure no pipe breakages have occurred and condensate drain sumps remain functional. Minor repairs are completed as required. On May 5, 13 and 23, 2006, SCS performed monitoring of all accessible LFG condensate sumps defined as ARTP-1 through 7 and FOTP-8 through 19 and recorded the liquid level control pump cycle counters (see Table 3). Also, on May 13, 2006, SCS performed repairs to the liquid level control pump at Condensate Sump No. FOCS-10, due to an observed malfunction, restoring proper operation. In addition, on May 23, 2006, SCS observed an elevated oxygen gas concentration n the below grade header pipeline between LFG Condensate Sump Nos. FOCS-10 and FOCS- 11, indicating a possible separation. As directed by the Client, SCS is continuing to perform evaluation/troubleshooting to this pipeline and will make further recommendations as necessary. In addition, during pervious reporting periods, SCS observed and repaired several slight air supply and/or liquid leaks at several LFG condensate sumps. As requested by the Client, SCS has prepared a proposal dated August 5, 2004, and recommends that the existing air and condensate connections be modified to decrease the potential for future separations/air leaks.