SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Additions based on the comments aoovided below: • I. No changes required to the work plan. The required permits have been obtained and inspection scheduled. 2. Based on the current groundwater data,the potential groundwater contamination(noted as above the appropriate MCLS with comparisons to the background well)below the existing pad(MW-1)do not appear related to the pad materials but other fill or activities that have occurred at the site as indicated by the analytical data. In M W-I (in the center of the pad),TPH-diesel and TPH-motor oil range were both detected along with low levels of toluene, benzene and MTBE. These contaminant would not be related to the pad materials at these concentrations based on the sampling of the pad material itself and knowledge of the materials used in the tile production process. Of the existing five monitoring wells,three are either always(MW-2)or seasonally downgradient(M W-3 and MW-5)of the pad, MW-I is centered in the pad,and MW-4 is upgradient of the pad. As the data from the five wells indicates the constituents detected in the groundwater are not caused by the pad materials, MonierLifetile does not feel that an additional well is warranted for the pad removal investigation. Investigations of the potential impacts unrelated to the pad materials would be the responsibility of the property owner/operator. 3. The title of the request was in error, MonierLifetile is requesting supervision for the pad removal. All information in the request of February 15,2002 related directly to the pad. The small stockpile of the reject tile that was located on the facility was previously removed. The pad,and related impacted soils,are being removed by excavation. In addition to the pad material itself, between 1 and 3 feet of the underlying soil, impacted by the pad materials,will be removed. All removed materials are being transported to a Class II landfill for disposal. Up to 5 confirmation samples will be collected following excavation of the pad and underlying soil to confirm removal. 4. A characterization letter report for the site will be prepared and submitted by March 29,2002 regarding the pad and potential impacts. 5. Final grading of the excavation location will be completed upon receipt of confirmation sample results noting completion of the removal action and seeding for vegetation will be performed. The area will be graded similar to surrounding topography in such a fashion as to minimize collection and infiltration of water and redirecting water away from the area. Note the area of removal is an existing low spot on the property which is why the pad was constructed. 6. A Closure report will be submitted to the Central Valley Region Water Quality Control Board within 60 days of the completion of the pad closure activities.