CORRESPONDENCE_1971-1981 - Laserfiche WebLink

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2 0 Industrial Container Corporation April 11 , 1972 these meetings, a great deal of discussion was centered around the tenta- tive discharge requirements issued by Regional Water Quality Control Board No. 5 on the existing City of Stockton Disposal Site immediately to the north. This tentative order indicates the Regional Board is concerned about the effect on groundwater conditions of the Folsom South Canal which is currently under construction east of this area. It is their feeling that imported water for surface irrigation will reduce the draft on the groundwater reservoir and will result in groundwater levels rising to historic high elevations (estimated to be approximately 8 feet from ground surface at the proposed site) . During our discussions, 1 examined between 20 and 30 well logs in the open file at the Department of Water Resources. The data presented on these logs suggests that groundwater is confined by a surface layer of CLAYS to a depth ranging between 50 and 105 feet from ground surface in the general area of the site. This suggests to me that the Folsom South Canal will indeed effect the management of the groundwater basin, however, under confining pressure by this CLAY cap, the water will not rise uniformly to within 8 feet of ground surface; rather, increased hydraulic head in the recharge area to the east will result in an increase of artesian pressure. Under these con- ditions, if a well were drilled through the CLAY cap into the aquifer, water would rise to a very shallow depth within the well . By limiting excavation depths so that an adequate thickness of the "clay cap" remains intact, your proposed disposal operation would be uneffected by this rise in piezometric surface. Engineers and geologists of the regulatory agencies were in tenta- tive agreement with this conclusion. However, a subsurface exploration of your site would be required to prove the contention that I have established. Flood Control Additional concern was expressed as to the effectiveness of the Little John Flood Control Channel to control surface drainage in this area. As we have previously discussed, additional work will be required to establish flood engineering criteria which was used during construction of this facility and what steps must be taken to provide 100-year frequency flood control pro- tection on the proposed site. General The remainder of the coordination meetings with officials of the regulatory agencies met with basic agreement and encouragement. A tentative exploration program was discussed and agreed to by all parties. Some information regarding the potential for disposal of cannery waste was reviewed and it appears that this type of disposal operation will depend basically upon permeabilities and engineering properties of soil on site and the ability to construct acceptable facilities with on-site materials. At this point, it appears that definite potential exists for this type of disposal operation. CONCLUSIONS The results of our Phase I Feasibility Investigation on your proposed site indicate that the property is potentially suitable for a Class II-2 disposal site. The final determination of the suitability of this prop- erty for development as a Class fr-2 disposal site will rest with the results