Agenda - Council - 09/15/1980 - Special

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Page 2 and Waste Management will 'be provided at the upcoming Septem- ber 15, 1980 City of Ramsey meeting by Emcon Associates. · Also on August 15, 1980, Mr. Pacey and Mr. Brisley in Mr. Woel£el's presence provided monitoring within each home that abuts the west property boundary of the landfill. No de~ tectable limits of combustible gas were £ound in any home during that survey. It should be noted here that Mr. Woelfel .' ~nd Mr. O~ter indepehdently had tzken tests on the evening o£ August lg, 1980 in the Hatch and the Van Wagner residences. .No detectable .limits were found at that time. ~;-?.i~i[ Gas monitoring probe location specifications were de- scribed to Mr. Woelfel by Mr. Pacey for critical evaluation of."the system's performance in preventing combustible gases · 'from escapi.ng .through the soils on the west property boundary. ~ -Locations along the property boundary between the extraction wells were selected on the basis that the vacuum ~Jithin the soils at those locations will be the vJes_kest and therefore will provide monitoring at locations least affected by the system. · · On August 21, 1980, bore holes were drilled at the appro- priate locations in preparation for~gas probe installation. . Mr. Art Dunn of the County of Anoka Con~munity Health and Social Services Department was present and witnessed several of the bore holes drilled. The holes were drilled to a depth of ten feet with a four inch diameter continuous flight auger (portable powered unit). Later on the same day, site personnel under the presence and direction of Mr. Woelfel constructed and installed sixteen gas probes per the installation details provided by. Emcon Associates. Eleven of the sixteen probes provide total coverage of the west property boundary. One probe was installed approximately forty-five feet west of the west property boun- dary on Waste Management of Minnesota's adjacent property (within the backyard of the site manager's home). On Friday, August 22~ 1980, site personnel installed eight additional probes at background locations ahead of the venting system and between the property boundary and edge of refuse fill. These probes were installed similarly to those placed along the west fence line. Details of the probe construction and installation will be presented at the September 15, 1980 meeting. On August 25, 1980, Mr. Art Dunn performed an initial round of monitoring of the newly installed probes. Mr. ?~oelfel provided ¥7aste I·~[~nagement of Minnesota's first set of monitoring on Tuesday~ August 26, 1980. His testing indicated O~ com- bustible gas in all west property boundary probes with the ex- ception of probe #? which gave a reading of 1.O~ combustible' gas. This probe is located approximately 150 feet south of the motor/blower shed. Cross checks between Mr. Dunn's and Mr. Woelfel's data indicate comparable results. Mr. Woelfel again performed a complete round of testing on August 28, 1980 at which time all west property boundary probes including #7 indicated O~ combustible gas.