03-09-1998 Council Packet - Laserfiche WebLink

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r t-i'f-'i'b TO:Michael P. Gaffron, Senior Planning Coordinator FROM: Stephen Weckman, On-Site Systems Manager DATE:January 9, 1998 SUBJECT: Septic Review for application #2321, Don Anderson 905 Old Crystal Bay Rd. S. Sketch Plan Review The proposed eight lot subdivision requires the use of on-site sewage treat nent systems. The information submitted to us by Otto Associates is incomplete and will not be acceptable for a final subdivision approval, however, the following is a review of each lot and its potential to have suitable drainfield sites: Lot 1 Soil borings performed by Otto Associates indicates a seasonal water table at 40 to 47 inches, but my soil borings from 1993 indicate a seasonal water table at 30 to 36 inches. Their soil borings indicate that trench systems may be feasible while mine show that a mound system is the only alternative. The soil borings arc iucated in areas where the slope is too steep for the installation of mound systems meeting City Standards. Additional testing would be required to verify whether two mound sites are possible on this lot. 14212 Soil borings performed on this lot by Otto Associates indicate a seasonal water table at 38 inches or less and would require the use of mound systems. The slopes on these areas is too steep to allow the use of mound system. Additional testing would be required to determine whether suitable drainfield sites exist on this lot. Lot 3 Soil borings performed by Otto Associates on this lot indicate that mound systems would be required, but slopes throughout the lot are too steep for mound systems. It does not appear that this lot can meet our standards for septic systems. Lot 4 Soil borings by Otto Associates indicate that mound systems must be used on this lot, but the slope direction and narrow lot shape are not favorable for any drainfield site. This lot will not be suitable for septic systems. I ;