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STATE OF CALIFORNIA—THE RESOURCES AGENCY EDMUND G.VOWNR.,Governor STATE SOLID WASTE MANAGEMENT BOARD 1020 NINTH STREET,SUITE 300 s P.O.BOX 1743 SACRAMENTO,CALIFORNIA 95808 September 27, 1978 SEP 2 9 1978 Mr. Jack L. Ronsko SNE JQRQUIN LO 22Public Works Di rector ACTH DI STRIC A` treet City of Lodi , CA Dear Mr. Ronsko: As you requested, we have reviewed the Harney Lane Sanitary Landfill grading plans which were submitted to you by San Joaquin County. The grading plans show a plateau configuration for the site. All exterior slopes are designed for a slope of 2 to 1 , (horizontal to vertical ) which is consistent with the State Minimum Standards. The top of the fill will slope from 117 foot elevation at the northeast end of the site to elevation 105 feet at the top of the southern face. This represents a drop of only 12 feet across the approximately 2500 foot length of the site; or less than 0.5 percent slope. We do not believe this is adequate to direr—`face. drainage from the fill. In regards to this matter we contacted the Central Valley Regional Water Quality Control Board. Their staff verbally felt that minimal slopes , 0.2 to 0.5 percent, would be acceptable. This recommendation was based upon rainfall , hydrogeologic conditions that protect ground water and the proposed- future use of the site (dry farming). . We do not concur with this recommendation from the standpoint of long term site maintenance. Over time, differential settlement will take place at the site, thus creating a situation where ponding will occur. This would prevent adequate drainage. In addition growth of crops within the inundated areas would be inhibited. The Regional -Board may be correct in their assessment that ground water is protected; however ponding on the fill , and subsequent infiltration can result in seepage from the side slopes. Such seepage could cause erosion and contaminate surface waters. Therefore both Regional !dater Quality Control Board and the local solid waste enforcement agency would probably require corrective measures to eliminate the ponding. In order to avoid a costly maintenance situation and possible surface water quality degradation we suggest consideration of the following alternatives: 1 ) The minimum surface slopes should be at least 1.0 percent (1 foot drop per 100 foot run). This will not, however, convey all surface water from the site. To prevent excess water from contacting 100% POSTCONSUMER RECYCLED PAPER