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On a sanitary sewer project currently under construction, a new manhole has developed a slight leak between the gasket and the pre-cast concrete manhole wall. The manhole is 13' deep and is located approx. 125' from a creek; current ground water conditions are high. The inside of the next...

Thanks for your response. However, my question was regarding a seal around a vertical sevice riser extended through the top of the steel casing - and not the end seals at the casing termini. The connection to the carrier pipe will probably be made with an Inserta Tee fitting, but I'm not sure...

Is there a way to form a watertight sanitary service connection to a 36" PVC carrier pipe inside a 54" steel casing pipe? Spacers will be installed on the 36" carier pipe centering it within the 54" steel casing. A vertical service riser needs to extend through the top of the casing and connect...

The existing sewer is 15" VCP. The replacement sewer is 36" and 30" pipe, and will be installed several feet deeper than the existing sewer. After thinking things over a little more...maybe the casing could be cored - large enough to install an inserta tee and then a flexible saddle tee...

The Owner is a unit of local government. It always looks good when a final cost can be presented to the Board that is less than the awarded project cost (which is the unmentioned underlying issue). But doing the right thing ought to trump how one appears to the Board. After all, the Board...

03. Awarded Contract was $4 million and was comprised of 50 pay items with individual unit prices. The awarded unit price for rock excavation was $110/CY. All ancillary tasks needed to complete the rock excavation (monitoring, inspections, etc.) were made incidental this pay item.

We have a multi-million dollar sanitary sewer extension project that is currently under construction. The soil borings obtained during project design revealed extensive rock excavation would be required. Accordingly, language was incorporated into the specs to address a myriad of blasting...

We're in the design phase of a sanitary sewer upsizing/replacement project. The new sanitary sewer will be 36" and 30" diameter PVC. Steel casings (bored and jacked) are planned along several runs to help minimize disruptions/impacts to local businesses. Two existing sanitary services need to...

Thanks for the input! The sewer will roughly parallel the river, which is approx. 200 feet to the west, and will cross beneath a creek in the slough area - most of the trees are clustered along the creek banks. Although the ice in the slough covers a broad area, the movement is consdierably more...

Hi, I'm designing a sanitary sewer that will include a 1,200' section extending through a slough. The slough is subjected to annual ice flows (shallow shields, typically 4" to 6" thick) from an adjacent river and I noticed many of the area trees are severely scarred due to abrasive action of...

Hi The sewage treatment plant where I work plans to install a 650 gal. heated mixing tank to process grease and scum from the primary settling tanks. Currently, scum from the primary tanks passes through a grinder and is then pumped to a Walker Separator tank...