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<br />k lot z 4~_ ass 0 cia t e s <br /> <br />1150 Dairy Ashford, Suite SOD <br />Houston, Texas 77079 <br />T 281.589.7257 F 281.589.7309 <br />housto n .office@klotz.com <br /> <br />March 16, 2009 <br /> <br />Mr. Ron Bottoms <br />City Manager <br />City of La Porte <br />604 West Fairmont Parkway <br />La Porte, Texas 77571 <br /> <br />Re: Addendum to Work Authorized February 6, 2009 <br />Proposed Scope of Services for Constructing Sheet Flow Relief Structures <br />City of La Porte, Texas <br />Klotz Associates Project No. 0127.009.000 <br /> <br />Dear Mr. Bottoms: <br /> <br />As requested, submitted herein is a proposal for additional professional engineering services for <br />design and preparation of bid documents to construct sheet tlow relief swales and stonn sewer <br />outfall improvements for the City of La Porte (the City). Per your request, this proposal is an <br />addendum to the work authorized by the City, February 6, 2009 per Attachment. <br /> <br />This addendum supplements the work from our authorized Letter of Agreement adding: <br />Creekmont Section One, Fahmont Park West subdivisions, bid phase services and construction <br />phase services to the agreement. <br /> <br />UNDERSTANDING OF THE PROJECT <br /> <br />Creekmont Section One drains natw'ally from west to east by storm sewer and overland sheet <br />flow toward Harris County Flood Control District (HCFCD) Unit BI06-00-00. Sheet flow <br />collects in the low-lying areas that cause flooding to occur for events more frequent than the 100- <br />year storm even. Floodwater from these areas eannot drain properly resul1ing in repetitive flood <br />damage and losses for homeowners who are not in the IOO-year flood plain. Excess runoff is <br />currently stored in streets and roadways. The homes along HCFCD Unit BI06-00-00 are <br />elevated above the roadway and function as a levee that retains water within the subdivision. In <br />addition, Fairmont Park West experiences a similar drainage problem and drains from west to <br />east toward HCFCD Unit B106-00-00 between Fairmont Parkway and Main. <br /> <br />The proposed improvements for Creekmont Section One and Fairmant Park West are identified <br />as projects No.3 and No.7 from the City Wide Drainage Study, January 2009. Proposed <br />improvements for these areas may require a combination of sheet flow relief'with increases in <br />storm sewer pipe size and inlet capacity. Swales are proposed to relieve sheet flow in low-lying <br />