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h: < HENRY M. HIRATA EUGENE B. DELUCCHI OPECiOR DEPUTY D.PLCTUP JOHN A. HAUG O o[PUTr oIP[cro[ COUNTY OF SAN JOAQUIN DEPARTMENT OF PUBLIC WORKS P. O. BOX 1810 — 1810 E. HAZELTON AVENUE STOCKTON. CALIFORNIA 05201 11001 0442281 October 22, 1984 Board of Trustees Lammersville School District 16555 W. Von Sosten Road Tracy, CA 95376 Re: LOS RANCHOS COUNTRY ESTATES SUBDIVISION Dear Board of Trustees: I regret the delay in responding to your letter of September 13, 1984. I felt, however, the concerns in your letter warranted a thorough perusal of the matter in question. The drainage along Von Sosten and Hansen Roads has been reviewed, in the field, by personnel from both our Public Services Division and our Maintenance Division. The heavy over—growth of bermuda grass at the southwest corner of Von Sosten and Hansen Roads needs to be cleaned; the grated drainage inlet will then be able to better function. This work will be scheduled and performed by County Maintenance forces in the near future. The Los Ranchos Country Estates Subdivision was designed so that the storm run— off from the roads and lots will be contained on the lots by individual ponds. The volume of the ponds is designed to be 150%, for lots of one acre or less, and 200%, for lots over an acre, of that required for a 10 year, 24 hour storm. The soils report recommends a percolation rate of 2—inches per day. The ponds will drain the design storm in six days, at this rate. There should be little or no run off from this subdivision that reaches Von Sosten or Hansen Roads. This project was designed by a civil engineering firm in accordance with the recommendations contained in the soil report as well as County Standards. This subdivision was designed according to the best information available and the State—of—the—art for storm drainage. The plans met all the criteria and were approved on October 1 , 1984.