CORRESPONDENCE_2008 (1/08 TO 6/08)

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1 if Page 2 of 2 Site Maintenance: Similar to last site visit, the entire landfill area was covered by overgrown dried vegetation which had made it impossible to determine whether the cover was intact and functioning as it should. The overgrown dried vegetation could also pose a fire hazard especially with summer approaching. Since the site had previously experienced a surface fire which had damaged a few of the extraction wells, CIWMB staff recommends that the landfill operator maintain the vegetation so that site cover inspection could easily be conducted and also to prevent surface fires from taking place which could cause a threat to public health and safety and the environment as well as damaging the landfill gas control system. As you will see in your next visit, sheep are now grazing the surface. In the past, it has been our objective to provide erosion control by vegetative cover, more vegetation meaning more erosion control. The thought that there might be too much cover is a new one for us, but we are taking care of it. Drainage Control: Abundant vegetation had grown in the perimeter drainage where the half - pipe corrugated metal drainage was located. It was also unclear where this drainage would drain the runoff into. Also, drainage on the southeast property boundary where grading had taken place did not appear to function as intended. The operator should provide adequate drainage of runoff for the entire site. Furthermore, depressions were noted across from the main entrance of the site. Please assure the operator will correct such depressions so to prevent ponding of runoff. The drainage ditch on the eastern side of the landfill drains into the retention pond on the southeast corner of the site. We do have vegetation in the ditch as a method of erosion control in the ditch itself. It seems to have functioned well, so far. Note that the extension of the closure cap will relocate this ditch. On the southern portion of the site, the regrading was intended to allow sheet flow off the closure surface into the existing tributary ditch, and then east to that same retention pond. These features seem to be adequate for the low rainfall and run-off experienced at the site. The depressions next to the landfill by the front gate are scraper ruts, caused when soil was taken from the borrow area to the recent regrading area. We will repair these prior to the rains. GW3: Please have the operator to extend each individual probe heights within this monitoring well to allow for ease of monitoring. GW1A: Operator should assure this monitoring well is capped and locked. Was it not capped and locked? I will make sure that it is. Please call (916-341-6354) or e-mail me if you have any questions. Thanks.............Gino 6/5/2008