2004 AGN JUL 20 I18 - Laserfiche WebLink

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Item #18 CITY OF COLTON AGENDA REPORT For the City Council Meeting of July 20"', 2004 TO: HONORABLE MAYOR & CITY COUNCIL MEMBERS FROM: ERIC FRASER, DIRECTOR OF WATER AND WASTEWATER OPERATIONS SUBJECT: APPROVAL TO PAY GRIFFIN DEWATERING CORPORATON INVOICES FOR EMERGENCY SEWER BYPASS SERVICES AT THE COLTON WATER RECLAMATION FACILITY IN THE AMOUNT OF $26,644.47 DATE: July 12, 2004 BACKGROUND The Colton Water Reclamation Facility (CWRF) has three main lines entering the facility. A thirty -inch line, which serves South Colton and Grand Terrace, and two lines that serve North Colton, a twenty-one inch line and an eighteen -inch line. The thirty -inch line runs north on Rancho Avenue from La Cadena Drive and into the facility. The twenty- one inch line runs south on Rancho Avenue to the facility and the eighteen -inch line runs south on Aqua Mansa Road to Rancho Avenue and into the facility. The twenty-one and eighteen inch lines were installed without manholes, leaving the collection crew without a means to properly clean and maintain them. These two lines are continuously surcharged back to Aqua Mansa Road. DISCUSSION & ANALYSIS On Wednesday April 21, 2004 at about 9:30am a crew from San Bernardino Water Department informed us that sewage was overflowing out of the manhole at the corner of Aqua Mansa Road and Rancho Avenue. We responded immediately with our vactors and spill response trailer. Rancho Avenue had to be closed from Aqua Mansa Road to La Cadena Drive in order to minimize any liability to the City, to prevent traffic from tracking the sewage further down Rancho Avenue and to clean up and disinfect the site. Since the blockage cleared itself prior to us arriving, we are not able to estimate the actual amount of the spill, it was not over 1,000 gallons. All of the sewage and wash down water were recovered with our vactors. A small amount made it to the storm channel next to the plant, but it was recovered. The channel was also disinfected. As a temporary solution to this problem, the City Manager authorized staff to contract with Griffen Dewatering Corporation ("Griffen") to set up a bypass of the two lines on Rancho Avenue at Aqua Mansa in order to video the 21" line and to scour the line with the flow by increasing the velocity through the line to the facility. The exact cause of the spill cannot be determined. I believe it was a combination of factors. We found the upstream manhole cover broken into four pieces, three were still on the ground but the fourth was in the manhole or in the line. We haven't been able to retrieve the fourth piece. Another factor, which may have played a part, was a metal construction stake about three feet long, the stake was found on the road next to the manhole.