Mul­ti­ple wa­ter sys­tem up­grades un­der­way

The Sentinel-Record - - FRONT PAGE - DAVID SHOW­ERS

More than $4 mil­lion was com­mit­ted through the end of last year from the $20 mil­lion bond is­sue the city floated for cap­i­tal im­prove­ments to the regional wa­ter sys­tem serv­ing more than 35,000 me­ters inside and out­side the cor­po­rate lim­its, ac­cord­ing to a re­port from the city fi­nance de­part­ment.

The $4,114,324 does not in­clude the $1,189,640 con­tract the Hot Springs Board of Direc­tors will con­sider at its busi­ness meet­ing Tues­day night. It will pay for new switchgear and a mo­tor-con­trol cen­ter at the plant treat­ing wa­ter col­lected by the in­take at up­per Lake Hamil­ton. The roughly

$500,000 out­lay the board au­tho­rized in Oc­to­ber for the pur­chase of 33 acres on Lit­tle Mazarn Road for the con­struc­tion of a new treat­ment plant has also yet to be added to the to­tal.

The city has ear­marked $5 mil­lion in bond pro­ceeds for pre­lim­i­nary en­gi­neer­ing, de­sign and right of way ac­qui­si­tion for the roughly $100 mil­lion project to bring its 23 mil­lion-gal­lon av­er­age day al­lo­ca­tion from Lake Oua­chita on­line. The bal­ance of the funds is ded­i­cated to other im­prove­ments, not in­clud­ing work be­ing done to the el­e­vated stor­age tank on Hol­ly­wood Avenue.

The $746,950 con­tract the board awarded Clas­sic Pro­tec­tive Coat­ings Inc. of Wis­con­sin in Au­gust was paid from the re­main­ing bal­ance of a 2015 debt is­sue. The cost in­cludes paint­ing the city logo on the ex­te­rior of the 1 mil­lion-gal­lon tank.

Matt Dunn of Crist En­gi­neers Inc., the city’s wa­ter sys­tem con­sul­tant, told the board ear­lier this week the logo will be painted on the east and west sides of the tank, with the west side be­ing dis­cernible from as far away as Oak­lawn Rac­ing and Gam­ing.

The in­te­rior is be­ing re­coated and out­fit­ted with a mix­ing sys­tem de­signed to im­prove wa­ter qual­ity on the south and east ends of the sys­tem’s 145-squaremile ser­vice area. Tri­halomethane con­cen­tra­tions

ex­ceed­ing the En­vi­ron­men­tal Pro­tec­tion Agency’s 80-partsper-bil­lion limit have been de­tected in those ar­eas, as their dis­tance from treat­ment plants at the north­west and north ends of the sys­tem pro­motes the for­ma­tion of the chem­i­cal com­pound.

A byprod­uct of the in­ter­ac­tion be­tween chlo­rine used in the treat­ment process and or­ganic ma­te­rial in the wa­ter, THMs be­come more pro­nounced the longer treated wa­ter re­mains in the dis­tri­bu­tion sys­tem. The state Health De­part­ment has said EPA re­search linked an in­creased risk of liver and kid­ney can­cer to long-term ex­po­sure to high THM con­cen­tra­tions.

The Hol­ly­wood tank is the pri­mary feeder for cus­tomers on the south and east ends of the sys­tem. Adding a mix­ing ca­pa­bil­ity will di­rect older wa­ter at the top of the tank to the bot­tom, where it can be dis­trib­uted be­fore the newer wa­ter. Sys­tem op­er­a­tors cur­rently have no way to cir­cu­late the con­tents of the tank, leav­ing older wa­ter in stor­age longer and increasing wa­ter age for cus­tomers on the sys­tem’s outer edges.

Cor­ner­stone tower

The $20 mil­lion bond is­sue in­cludes funds for the 190-foot­tall stor­age tower be­ing built be­hind Cor­ner­stone Mar­ket Place. The city com­mit­ted $858,813 from the bond is­sue to­ward the

$4,647,000 con­tract the board awarded Chicago Bridge & Iron LLC of Ge­or­gia in June. The bal­ance was paid from the 2015 bond is­sue.

It will be the first el­e­vated tank added to the dis­tri­bu­tion sys­tem since the Hol­ly­wood tank came on­line in 1964, the city has said, hold­ing 3 mil­lion gal­lons that can tie into the 20inch trans­mis­sion line that runs along the King Ex­press­way.

Con­struc­tion is 30 per­cent com­plete and is ex­pected to con­clude next win­ter.

“We’re wait­ing for the pedestal crew to come in next,” Dunn said ear­lier this week, ex­plain­ing that foun­da­tion work that’s been com­pleted re­quired the pour­ing of 1,000 feet of con­crete sup­ported by more than

600,000 pounds of steel re­bar. “Three mil­lion gal­lons weights a lot. You have to have a big load un­der­ground to hold that wa­ter in the air.”

North­woods dams

Core sam­ples for geotech­ni­cal anal­y­sis of dams im­pound­ing lakes San­der­son and Dil­lon at the North­woods Ur­ban For­est Park have been com­pleted.

The anal­y­sis is part of the $1,209,350 con­tract the board awarded Crist in July for en­gi­neer­ing work on im­prove­ments ex­pected to cost al­most $10 mil­lion.

The park’s three small lakes, in­clud­ing Bethel, were de­com­mis­sioned as a mu­nic­i­pal wa­ter source decades ago. Hewed from a nearby moun­tain, the ma­sonry that forms Dil­lon Dam is more than a cen­tury old. Veg­e­ta­tion that has en­croached over that time has loos­ened the mor­tar that binds the bricks together, as ev­i­denced by the tree that has sprouted from the mid­dle of the struc­ture. En­croach­ing veg­e­ta­tion has also af­fected the struc­tural in­tegrity of Bethel Dam, en­gi­neers have said.

Switchgear

The $1,189,640 con­tract the board will con­sider Tues­day night for a Kohler switchgear and master con­trol cen­ter at the wa­ter plant on up­per Lake Hamil­ton will also be paid from the

$20 mil­lion bond is­sue. It’s part of the al­most $4 mil­lion project to re­place the sys­tem that con­trols high-ser­vice pumps that push treated wa­ter through two large di­am­e­ter dis­tri­bu­tion lines lead­ing from the plant.

The equip­ment will be lo­cated on the 4.5 acres ad­ja­cent to the plant’s Cozy Acres Road lo­ca­tion the city ac­quired for

$113,450 last year.

The board awarded Crist a

$298,250 con­tract to de­sign the con­trol sys­tem and over­see its in­stal­la­tion.

The Sen­tinel-Record/Richard Ras­mussen

TANK MAKEOVER: Arms ex­tend­ing from the Hol­ly­wood Avenue wa­ter tank sup­port a cur­tain that’s raised when crews are paint­ing the city logo on the 1 mil­lion-gal­lon struc­ture. The city said the fi­nal coat will be ap­plied soon.

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