Gonzalez provides Inflow and Infiltration (I/I) investigations and analyses throughout the Midwest region. Our experienced staff specializes in the review and assessment of wastewater collection infrastructure both public and private for the purpose of reducing I/I. Our team is highly qualified and experienced in assessing current conditions; evaluating collected data; identifying underlying causes; and developing cost-effective recommendations.
Flow Monitoring StudY
Gonzalez Companies performed flow monitoring at thirteen (13) designated locations for the city of Frankfort, Kentucky. Gonzalez assisted city personnel in choosing critical monitoring locations in combination sewers. Site sheets & accompanying photos were compiled for each location. Meters were monitored for three months in order to determine base line flows and compare with wet weather flows due to rain events.
Gonzalez Companies field crews performed bi-weekly site visits to perform any necessary maintenance. All meters utilized wireless telemetry and data was viewed daily by an analyst. At the end of the monitoring period, Gonzalez Companies delivered a technical memorandum and processed data in an excel format that summarized flow values.
INFLOW & INFILTRATION AND STORMWATER STUDY
The City of Belleville owns and operates its sanitary and storm sewer collection system which includes combined sewer in some portions of the system and separate sanitary and storm sewer in other portions. The objective of the I/I Study was to identify inflow and infiltration areas, estimate volume of flow from I/I, recommend available methods for correction, and estimate the cost associated with the correction methods. The study was performed in an effort to provide the City with the condition and capacity of the collection system and thus prioritize improvements to reduce treatment plant operating cost, reduce localized flooding, and potentially provide treatment capacity that could minimize future plant expansions.
Louisville Metropolitan sewer district - Manhole Inspections
Louisville MSD contracted with Gonzalez to inspect and provide rehabilitation for 1,100 manholes located along the Lea Ann Way Interceptor, Goose Creek, and Admiral Way Watersheds. Gonzalez staff mapped the horizontal and vertical location of all manholes within sub-foot positional accuracy. The results of the GPS data collection were imported into the Districts Data Management System.
SANITARY SEWER SYSTEM SMOKE TESTING
Gonzalez performed site evaluations of the sanitary sewer and stormwater system to identify potential sources of inflow and infiltration (I/I), and cross-connections. Gonzalez staff performed smoke testing on approximately 290,000 linear feet and noted locations of potential defects using GPS. Data collected from the site evaluation was compiled into a GIS map and report was prepared that summarized the public and private I/I defects.
METROPOLITAN ST. LOUIS SEWER DISTRICT CRITICAL INFRASTRUCTURE
ST. LOUIS, MISSOURI
Gonzalez evaluated over 450,000 linear feet of closed circuit television (CCTV) inspections of sewers within the MSD system. The evaluations included a quality assurance review and confirmation of field inspection characteristics, summary of condition assessments, and the initial rehabilitation recommendation for each pipe segment inspected. Gonzalez also facilitated necessary map revisions found during the CCTV inspections.
Furthermore, we provided assistance in records review, base map updating, GIS support, as well as field services. These services included manhole inspections, dye tracing, smoke testing, and field observations to support efforts of the District to continue to collect necessary data in critical areas as an extension of their staff.