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#,W,CITY OF STOCKTON AZ# DEPARTMENT OF PUBLIC WORKS CITY HALL 425 N. ELDORADO STREET STOCKTON, CA 95202-1997 April 5, 1995 MR MIICE HUGGINS, SUPERVISING RENS Environmental Health Division Public Health Services P.O. Box 2009 Stockton, C A 952011 AUSTIN ROAD LANDFILL GAS (LFG) RE MMIATION PLAN As the attached table and map shows, first quarter, 1995 LFG monitoring revealed that methane concentration in Soil Gas Probe (SGP) #3 and SGP #6 exceeded the 5% methane lower explosive limit (LEL). As you know, CCR Section 17258.23 requires that methane concentrations be kept below the LEL at the landfill property boundary. This was the first quarter SGP #3 methane concentration (7.25 exceeded the LEL and the second quarter SGP #6 methane concentration (5,9590 exceeded the LEL. Although SGP #6 exceeded the LEL a second time, it should be noted that methane concentration in this probe has dropped significantly compared to last quarter results. This is, undoubtedly, due to Pacific Energy, restarting their LFG recovery plant after having it down temporarily for maintenance. As noted in previous reports, LFG probes SGP #3 and SGP #6 are located in refuse and SGP #6 is located more than 1,000 feet north of the landfill's southern property boundary. We, therefore, do not know whether or not methane concentration exceeds the LEL at the landfill's property boundary directly south of SGP #6. We also have not confirmed (by retesting) that SPG #3 methane concentrations exceed the LEL. LFG REMMIATION PLAN: SGP #3 and SGP #6 We are proposing a three step plan for dealing with the first-time LEL exceedance in SGP #3 and the second -time exceedance in SGP #6: Step 1. Within 14 days of your approval of this plan, we will take subsurface methane reading(s) at the property boundary south of SGP #6 to confirm that methane concentrations do not exceed the LEL at the property boundary (the point of compliance per CCR Section 17258.23). I Step 2. Within 60 days of your approval of the plan, we will abandon SGP #5 and SGP #6 and replace them with new LFG monitoring probes, #5a and #6a, at the landfill's southern property boundary (see attached map). This will "STOCKTON ... CALIFORNIA'S SUNRISE SEAPORT"