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)Q.p`gU Ily. O <br /> COUNTYF SAN JOAQUIN THONIAS'R.FLINN <br /> DEPUTY DIRECTOR <br /> DEPARTMENT OF PUBLIC WORKS <br /> P.O.BOX 1810- 1810 E. HAZELTON AVENUE <br /> �°�iFoiat'�P STOCKTON, CALIFORNIA 95201 THOMAS M.GAU <br /> MANUEL LOPEZ (209) 468-3000 DEPUTY DIRECTOR <br /> DIRECTOR FAX (209) 468-2999 <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> August 24, 2000 <br /> MEMORANDUM <br /> TO: Robert McClellon, Lead Senior R.E.H.S. <br /> Public Health Services <br /> Environmental Health Division <br /> FROM: Michael Kalish <br /> Associate Engineer <br /> SUBJECT: LANDFILL GAS MONITORING AT CORRAL HOLLOW <br /> SANITARY LANDFILL <br /> This is in response to your letter dated July 25, 2000, regarding landfill gas migration at the <br /> Corral Hollow Sanitary Landfill. In response to your request to review and approve landfill gas <br /> control system design plans, three copies of the plans and specifications were delivered to your <br /> office for review. The project is due to begin construction on September 11, 2000. We plan to <br /> begin the project as close as possible to the target date because of the length of the project and <br /> weather considerations. <br /> Also stated in your letter is a request to supply verification of compliance with Title 27, CCR, <br /> Section 20923(x)(2) or submit a plan to install an additional gas monitoring well between GW-1 <br /> and GW-7. In a letter dated March 7, 1995, (attached) addressed to the Environmental Health <br /> Department (EHD), the California Integrated Waste Management Board (C ) approved the <br /> proposed well spacing between GW-1 and GW-7 due to the subsurface conditions on the eastern <br /> boundary of the site. An existing, high pressure, crude oil pipeline that runs along the eastern <br /> boundary makes it impossible to install any subsurface monitoring devices at the perimeter. It was <br /> recommended in the C 's letter that the bar hole punch method be used instead of a <br /> permanent well. We request a waiver from this recommendation for employee safety reasons. <br /> Texaco has marked the location of their pipeline, but their markings have not been accurate in the <br /> past, and the depth of the pipeline is not known in all locations. In fact, the oil pipeline was struck <br /> during installation of GW-1 due to inaccurate markings placed by Texaco. Therefore, we do not <br /> feel that it is safe to explore the subsurface in this area by any method. <br /> In closing, the County is aware of our requirement to control landfill gas migration, and we feel <br /> that we are making a good faith effort to do so. We are also aware of future development plans <br />