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— A Professional Corporation — — 900 "H" ST., SUITE G • P. O. BOX 816 • MODESTO, CA 95353 s (209) 526-4214 • FAX (209) 526-0803 February 25, 1989i � y lf& County of San Joaquin J Department of Public Works .s 1810 East Hazelton Avenue Stockton, California 95201 Attn: Mr . Pete Martin Re : Hempstead Court Groundwater Dewatering Dear Sir: In response to your letter of February 14, 1989, I am submitting the following information : Pond Modification: No change is anticipated to the 5=1 side slopes as per your request . Therefore no changes are requested to the approved storm drain system (pipes, catch basins, outlet or pond geometry) . "Tile Drain" Installation: An easement across lot 11 is being prepared and will be recorded prior to the County 's approval of the subdivision improvements (and release of the Guarantee Bond) . All construction will be done as per the attached "Construction Requirements for Tie-in to New Jerusalem Drainage District Pipelines" and inspection by the district and local soils conservation service is anticipated . The Home Owner's Association C . C . & R. 's will guarantee maintenance of the "Tile Drain" ( if ever required) . The County service area currently is not expected to maintain the system . If this situation changes in the future, the system will have to be brought up to then current standards . The existing main "collector line" flows at a hydraulic grade of approximately . 002 ft/ft to the river . As per a telephone conversation with N .J . D . D . personnel and Mr . Bob Stroud of the Stockton office of the U .S . Soils Conservation Service, if the river's water level is ever higher than the gravity outflow, the flap gate closes and the flow is diverted to a pumping plant, which is equipped with an emergency gravity by-pass system . This insures against any backflow into the system . - ROY A. GALLI, C.E. • ROBERT R. BRADEN • DENNIS E. WILSON