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7 <br /> A Professional Corporation <br /> 900 "H" ST., SUITE G • P.O. BOX 816 • MODESTO, CA 95353 • (209) 526-4214 <br /> m _ <br /> February 5, 1988 <br /> County of Stanislaus <br /> Department of Public Works <br /> Attn: Tom Gau ' <br /> P.O. Box 1810 o a <br /> Stockton, CA 95201 <br /> A <br /> Re: Hempstead Court Subdivision <br /> Dear Tom: <br /> Enclosed please find "Log of Borings", dated February 4, 1988, by <br /> Quality Control Inspection for the Hempstead Court Subdivision. After '• <br /> examination of these borings, information obtained from the local <br /> irrigation district, Department of Water Resources, Co. Health Department <br /> and local well drilling firms, it is Q.C.I. 's conclusion that the ground <br /> water encountered at 8'-10' below the existing ground surface at Hempstead <br /> Court is a "Perched Water Table." Based on this background, we propose <br /> the following solution to the drainage requirements for the proposed <br /> subdivision, which may or may not be a deviation from your standard <br /> requirements: <br /> 1) Construct a "Percolation Basin" to collect and dispose <br /> of on-site runoff of required size (in accordance with <br /> your county standards and subsequent updates) with a <br /> bottom elevation no less than 2' above the existing <br /> "Perched Water Table" <br /> 2) Drill a "Dry Well" to a depth of approximately 40' <br /> (from existing ground surface) which will encounter at <br /> least two sand-gravel strata. This will help drain the <br /> proposed basin as well as stabilize the water surface of <br /> the existing "Perched" water table. <br /> I understand this will be acceptable to the County's health dept. <br /> field personnel if acceptible to the County engineering department. <br /> Thank you for your consideration of this matter. <br /> Sincerely, <br /> MID-VALLEY ENGINEERING, INC. <br /> Al Toschi <br /> AT:SM <br /> cc: Dennis Wilson <br /> Jeff Davidson <br /> EDISON S. AYER, L.S. 9 ROY A. GALLI, C.E. • ROBERT R. BRADEN • DENNIS E. WILSON <br />