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Dan Helt, PE, PLS <br />Land Surveying <br />Mr. Helt is experienced in both civil engineering and land surveying <br />aspects of construction and land development projects. He has <br />designed and prepared both small and large federal, municipal, <br />commercial, and residential grading and drainage plans, as well as <br />utility plans and project associated public improvement plans. Mr. <br />Helt has prepared a variety of hydrology and hydraulic documents <br />for review of analysis and compliance with codes and standards. He <br />has prepared and reviewed specifications, calculations and other <br />basis of design documents. <br />Mr. Helt has performed field boundary and topographic surveys, as <br />well as construction staking, certification and monitoring, and ALTA/ <br />ACSM surveys. He has considerable experience researching boundary <br />and chain of title information, and preparing legal descriptions. <br />Mr. Helt has extensive knowledge in the use ofAutodesk's Civil 3D <br />software for both conceptual and detailed design studies, as well <br />as the production of construction plan sets. He also has significant <br />experience using for flow modeling and storm routing and HEC-RAS, <br />USEPA SWMM and Storm and Sanitary Analysis for stormwater <br />system design and modeling. <br />Caruthers Park Stormwater and Urban Runoff Capture Project, City <br />of Bellflower, Bellflower, CA. Survey Manager. Mr. Helt oversaw survey <br />services for this Caltrans funded stormwater capture project. Tetra Tech <br />is providing a Project Engineering Study Report (PESR) that includes <br />all necessary analyses to provide a recommendation for regional <br />stormwater capture treatment and implementation. The analysis identifies <br />the existing site hydrology, water quality, and hydraulics to determine an <br />optimal combination of the inflow rate, storage volume, and outflow. The <br />Caruthers Park Project consists of a gravity diversion from two separate <br />Los Angeles County Flood Control District storm drain lines; a 72" RCP <br />line that drains 261 acres of the Los Cerritos Channel, and a 38' wide <br />rectangular concrete channel that drains 2,995 acres of the Lower San <br />Gabriel River. The diverted flows pass through a pretreatment system <br />to remove trash, debris, and sediment. The runoff is then passed into <br />a large buried multi -chambered storage/infiltration facility that will be <br />treated and used to irrigate the park. Flows in excess of the required <br />irrigation demands will pass into the infiltration gallery to be exfiltrated <br />through the soil to eventually combine with the ground water. <br />27 TETRA TECH <br />