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BROWN AND CALDWELL ~ <br /> CONSULTING ENGINEERS <br /> <br /> September 29, 1988 <br /> <br /> Mr. Joseph Eli iott <br /> Director of Public Works and Utilities <br /> City of Pleasanton <br /> 200 Old Bernal Avenue 11-3826-01/1 <br /> Pleasanton, California 94566-0802 11-3826-01/6 <br /> <br /> Subject: Special Engineering Services No. 3 for <br /> Supplementary Subsurface Investigation <br /> on Del Valle Parkway; Contract for <br /> Consultant Services, Preliminary Design <br /> Phase of Cross-Town Sanitary Sewer Interceptor <br /> <br /> Dear Mr. Elliott: <br /> <br /> As directed by Mr. Garry E. Lee on August 29, 1988, a supplementary <br /> subsurface investigation will be conducted near 4455 Del Valle <br /> Parkway for the Cross-Town Sanitary Sewer Interceptor. <br /> <br /> Mr. Lee has informed us that, according to the pastor of Valley <br /> Community Church at 4455 Del Valle Parkway, considerable difficulty <br /> was encountered in completing the excavation for the church bell <br /> tower because of "running" gravel and sand which has been <br /> interpreted as marking the location of an old stream bed. The test <br /> borings that our geotechnical consultant, Berlogar Geotechnical <br /> Consultants, drilled for the original geotechnical investigation, <br /> as described in the report of May 6, 1988, bracket the area in <br /> question, and no indications of an old stream channel were <br /> disclosed at those locations. <br /> <br /> To determine whether, in fact, adverse subsurface conditions <br /> possibly associated with an old stream channel exist at the church <br /> site, Berlogar has proposed to drill one additional test hole on <br /> the centerline of the proposed interceptor route and directly <br /> opposite the church bell tower. Berlogar Geotechnical Consultants' <br /> field engineer will log the boring and will recover relatively <br /> undisturbed soil samples. If deemed necessary, laboratory testing, <br /> including moisture content and dry unit weight determinations, will <br /> be performed. <br /> <br /> Following completion of the field exploration and any necessary <br /> laboratory testing programs, Berlogar Geotechnical Consultants will <br /> issue a supplementary report describing the subsurface conditions <br /> encountered; their impact upon the design, construction and <br /> performance of the interceptor; and special recommendations, if <br /> appropriate, beyond those stated in the original report~- <br /> <br /> 28 1988 <br />MAILING: POST OFFICE BOX 8045 WALNUT CREEK, CALIFORNIA 94596-1220 <br />STREET,' 3480 BUSKIRK AVENUE PLEASANT HILL, CAL|FORNIA 94523-4342 · (415) 937-9010 · FAX: (415) 937-9026 PLEASANTON <br /> ENGINEERING DEPT. ' <br /> <br /> <br />