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Northlake Ind Park-CS 921202The City With A Beautiful Future P,O. Box 478 Coppell, Texas 75019 214-462-0022 December 2, 1992 lVlr. Bill Thompson Thompson Interest 8333 Douglas Ave., Suite 1510 Dallas, TX 75225-5811 SUBJECT: Northlake Industrial Park - 27 Acre Ta'act Erosion and Siltation Proble'ha Dear Mr. Thompson: As per our telephone conference call on November 18, 1992 among Nathan Maier, P.E.,. you, and myself, several concerns and complaints have been made to the City regarding erosion and drainage' problems associated with activities, i.e. grading and excavation, on your subject property. Please note that Ed Spalding of 245 E. Bethel Road, has expressed his concerns for erosion and siltation along the natural stream running through the back of his lot to its confluence with Grapevine Creek. (See attached location map). Mr. Spalding has indicated that over the past few years, there have been some mining and massive grading activities on the above referenced property (L.I. trac0. It appears that such activities are still in progress. On November 3, 1992, Engineering staff met with Ed Spalding and Bob Bernhard, of 200 E. Bethel Road, at the downstream of the culverts. We viewed your property from the top of the railroad tracks, and there were no evidence of any erosion and sedimentation control measures. We also walked along the down stream section of this natural drainage way, north of Bethel Road, on the east side of Mr. Bernhard's house. In general, erosion and siltation along the upper and lower segments of the referenced stroh were apparent, and the existing culverts under Bethel Road are silted in for about one flfird of their capacity. Please note that although construction plans for drainage and grading improvements were approved by the City in September 1989, it is the City's policy that approved plans are only good for one (1) year. Also, we were unable to locate a copy of a grading pe..rmit in our fries. Please provide a copy of such permit along with a project status report and a set of revised grading plans related to activities on your property. Letter to Mr. Bill Thompson December 2, 1992 Page 2 I have spoken to Mr. Maier and his assistant, Mike Oarrett, on several occasions in the past, and recently. It is my understanding that they will discuss a course of action with you for correcting this erosion problem and will coordinate it with the City staff. It is important to note that in addition to the City's Erosion and Sedimentation Control Ordinance //91514 (copy attached), there are other federal regulations in effect which construction activities must comply with. The Clean Water Act makes it unlawful to discharge storm water from construction sites to waters of the United States, unless authorized by a National Pollutant Discharge Elimination System (NPDES) permit. These rules require that a Notice of Intent (NOI) be submitted to the Environmental Protection Agency (EPA) and a Storm Water Pollution Prevention Plan (SW3P) be prepared by .October 1, 1992. A copy of the NOI should be provided for our fries and records. Please be advised that, due to lack of adequate vegetation on your property, and as a result of what appears to be a massive excavation, mining and/or grading project, the velocity and the surface drainage runoff have increased considerably. This has caused erosion and siltation downstream. I suggest that a meeting take place among affected City staff members, you, and Mr. Maiers, Mr. Spalding and Mr. Bernhard as soon as possible to discuss your proposed course of action. Your timely attention given to this matter is greatly appreciated. Please provide me with a written response prior to December 15, 1992, and I will arrange a meeting shortly after. If I can be of any help, please give me a call at (214) 393-1016. Sincerely, M. Sh~and, Civil Engineer MSD/bd cc: Kenneth M. Griffin, P.E., City Engineer Greg Jones, Acting Building Inspection Steve Goram, Director of Public Works Larry Davis, Construction Inspector Bob Bernhard (200 E. Bethel Road, Coppell) Ed Spalding (245 E. Bethel Road, Coppell) Nathan Maier, P.E., Nathan D. Maier Engineers w J iL.il J J J ii.