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xo THOMAS M. GAU DIRECTOR $C i c oaN�r FRITZ BUCHMAN DEPUTY DIRECTOR MICHAEL SELLING DEPUTY DIRECTOR JIM STONE DEPUTY DIRECTOR ROGER JANES BUSINESS ADMINISTRATOR March 18, 2014 E P. O. BOX 1810 -1810 E. HAZELTON AVENUE STOCKTON, CALIFORNIA 86201 (209) 468-3000 FAX (209) 468-2999 www.sjgov.org/pubworks Mr. Todd Del Frate, PG �® Engineering Geologist California Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95820-6114 SUBJECT: RESPONSE TO AREAS OF CONCERN, CORRAL HOLLOW SANITARY LANDFILL Dear Mr. Del Frate: Please consider this a response to the Inspection Report dated March 3, 2014. The major work to correct the erosion issues has been completed.. The County has constructed a number of earthen berms extending across the newly -closed area that was recently subjected to erosion (See attached Figure and photographs). These berms will minimize the path the surface water takes, which will minimize both the over-all erosion of the surface and the demands on the local discharge area at the southern end of the newly -closed area. It may be important to note that, in some ways, erosion control prior to the establishment of the vegetation presents conflicting conditions, that is, highly compacted soil may be less erodible but is also less conducive to the growth of vegetation. The multiple berm configuration as constructed addresses this situation by mitigating erosion concerns while minimizing adverse impacts on area vegetation efforts. The County plans to hydroseed the affected area in early Autumn 2014 when conditions are optimal for vegetative growth. Hydroseeding will include the placement of blown straw as identified in the Inspection Report. The County will also remove and replace the straw wattles in the Caltrans area beyond the landfill fence by the end of April 2014. Prior to hydroseeding, the County will ask a horticultural consultant to assess what soil treatments might be needed to improve vegetative growth, and perform rototilling as needed to loosen the top soil. It is anticipated that next year's rains will come early and provide sufficient moisture to germinate the seeds. If not, the County will continue to maintain the cover of the newly closed area by installing and maintaining Best Management Practices (BMPs). If you have any questions, please call Michael Carroll, Engineer IV at (209) 468-8504.