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Phosphate Calculations - Revision 4.pdf Hi Mike, | just wanted to follow up on the email below and get your estimation on when the permit will be issued. Are you requiring any additional data before a decision can be made? The calculation that we developed meets with the requirement of the feed rates as agreed to between your office and the EPA based on the email from Stephen Busch to the EPA on November 22, 2015. The pumps were resized to handle the anticipated Max feed rates requested. We are assuming that since we are using the chemical used by DWSD or corrosion control, we are not required to go thru a study phase. Additionally, during our review of the email trail with EPA, we noticed that the EPA did recommend that Jar Testing be done to evaluate the impact of the orthophosphate dose on turbidity of the DWSD water. Stephen has also noted that a treatability study will need to be conducted on the KWA water in conjunction with the Flint WTP processes to optimize the corrosion control treatment needed before use in the system. Does the permit to be issued going to highlight more specific requirements on the duration(s}), method{s) and reporting needed for each of the testing required before implementation is allowed into the system? Your assistance and feedback are greatly appreciated to make sure that our timeline for the introduction of the initial corrosion control into the DWSD water and its future implementation into the KWA Raw feed can be accurately depicted in our discussions with the City and KWA, Thank you very much for your continued support. Samir F. Matta, PE Team Leader Lockwood, snares &Newnam, Inc. KUO A DALY COMPANY 1311 South Linden Road, Suite B « Flint, MI 48532 2121 University Park Dr, ‘Suite 100 « Okemos, MI 48864-6901 D 517.819.2367 C 517.819.2367 www.lan-inc.com + [email protected]

Hi Mike, | have been asked whether the MDEQ/EPA is going to have a formal response/review comments to what is needed for us to obtain the permit. | mentioned that based on our discussion that if we provide the information below, we will be able to get the permit issued. e City of Detroit residual is around 0.4 to 0.5 mg/L as PO4 e MDEQ wants Flint to maintain a residual of approximately 1.0 mg/L as PO4 e Feed pump capacity should be sized to address a max dose of 2.0 mg/L as PO4 e Cut sheets and MSDS from the City’s supplier Please let me know if you require anything else and/or if a formal response will be forthcoming. Thanks. | Samir F. Matta, PE ' Senior Project Manager Lockwocd, Andrews . & Newnam, Inc. A LEO A DALY COMPANY 2121 University Park Dr, Suite 100 « Okemos, Mi 48864-6901 T 517.203.5437 D 517.203.5437 www.lan-inc.com * [email protected] CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and ail attachments, (collectively, this “Communication’), is Intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential and/or proprietary. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately and destroy any and all copies of this Communication. xxxEND_PAGE:deq04_b300_3630_4070_057 Rennaker, Joanne (DEQ)

Hi Mike, | have been asked whether the MDEQ/EPA is going to have a formal response/review comments to what is needed for us to obtain the permit. | mentioned that based on our discussion that if we provide the information below, we will be able to get the permit issued. City of Detroit residual is around 0.4 to 0.5 mg/L as PO4 MDEQ wants Flint to maintain a residual of approximately 1.0 mg/L as PO4 Feed pump capacity should be sized to address a max dose of 2.0 mg/L as PO4 Cut sheets and MSDS from the City’s supplier Please let me know if you require anything else and/or if a formal response will be forthcoming. Thanks. Samir F. Matta, Pe Senior Project Manager Lockwood, Andrews & Newnam, inc. niversity Ir, T 517.203.5437 D 517.203.5437 wiwwilen-ine.cai e SFMaiiea@lan-ing com CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication”), is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential and/or proprietary. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately and destroy any and all copies of this Communication. xxxEND_PAGE:deq16_b5_0892_4900_0337

Samir, As we discussed, we will need to know if the residual was measured as product or as available (P). Michael Prysby, P.E. District Engineer Office of Drinking Water and Municipal Assistance 517 290-8817

Hi Mike, Please see below from Brent as we discussed. | | Thanks. Samir F, Matta, PE Team Leader Lockwood, Andrews & Newnam, inc. A LEG A DALY COM LEO A DALY COMPANY 1311 South Linden Road, Suite Be Flint, MI 48532 2121 University Park Dr, Suite 100 « Okemos, MI 48864-6901 D 517.819.2367 C 517.819.2367 www.lan-inc.com + [email protected]

Hi Mike, Please see the response from Mary, DWSD. Thanks. | Samir F. Matta, PE Team Leader Lockwood, lad & &Newnam, Inc. ic. A A LEO ® DALY COMPANY A DALY COMPANY 1311 South Linden Road, Suite B « Flint, MI 48532 2121 University Park Dr, Suite 100 « Okemos, MI 48864-6901 D 517.819.2367 C 517.819.2367 www. lan-inc.com » [email protected]

Hi Mike, Please sme attached for your file and use, Let me krinw if the inferrnation satisfy your needs and whether you have atiditional information that you would like us te have answered. Thanks. Samir F. Matta, PE Team Leader Leckwood, Andrews &Newnam, inc. SREG 3 Daiy Ob MPANS 1311 South Linden Road, Suite Be Flint, MI 48532 2121 University Park Dr. Suite 100.* Okemos, MI 48864-6901 D 517.819.236 i wan, H CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication”), is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential and/or proprietary. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately and destroy any and all copies of this Communication. xxxEND_PAGE:deq17_b453_2630_2647_03 Flint Phosphate Calculations Chemical will be 75% NSF certified Phosphoric acid 75% acid has a density of 13.17 #/gal. (5,974 g/gal) 3. Of this 75% is Phosphoric acid (H3PO,) = 4,480 g H3PO,/gal Molecular weight of H3PQ, is 97.9913 g/mole Moles H3PO,/gal=45.72 4 Moles H3PO, = Moles Orthophosphate (PO,°) = Moles Phosphorus (P) Species | Molecular Wt. | Moles / gal | g/gal H3PO, 97.9913 45.72 4,480 PO,? 94.9676 45.72 4341.92 P 30.97 45.72 1407.72 Proposed Operating Parameters Plant Flow | Dosage as PO,* 25 MGD 1.5 mg/l Average 16 MGD 0.8 mg/l Minimum 4 MGD 0.4 mg/ *Equivalent dosage to PO,” dosage Dosage as P* 0.47 meg/| 0.25 mg/| 0.13 mg/l Feed Rate Calculations Maximum feed rate ( Max Flow x Max Dosage) 25 MGD x 3782 g/gal H.O x 1.5 ppm / 4,341.92 g/gal = 32.66 gpd Phosphoric Acid Average feed rate (Avg Flow x Avg Dosage) 16 MGD x 3782 g/gal HO x 0.8 ppm / 4,341.92 g/gal = 11.15 gpd Phosphoric Acid Minimum feed rate (Min Flow x Min Dosage) 4 MGD x 3782 g/gal H,O x 0.4 ppm / 4,341.92 g/gal = 1.39 gpd Phosphoric Acid xxxEND_PAGE:deq17_b453_2630_2647_04 \ N CZ 3C TOTE 00 ALE ESCA NS BS SXos NS FOR CHEMICAL IBC TOTES 2430 Stanwell Drive, Concord, CA 94520 USA 925-686-6700 Fax: 925-686-6713 | [email protected] pot Safely track chemical usage and tank levels Warn of dangerous : over and under- | feed conditions Sttict federal a g : requirements have sated | a nese for water and wastewater plant opératérs to easily and accurately track chemical The IBC Tote Scale gives you this information along with feed rates and usages. the assurance that your chemical supply will not unexpectedly run out. The heavy duty steel platform is pro- tected with our advanced 80 mil thick TUF -COAT™ Environmental Armor. Tuf-Coat is highly resistant to chemicals, abrasion, im- pact and ultraviolet light degradation making the IBC Tote Scale ideal for even the harshest environments. Options in- clude 316 stainless steel and MaxSense™ high accuracy models. 4]] 4-20mA remote monitoring reduces operator exposure to chemicals Prevent system

Hi Mike, Please see attached updated plans for the Corrosion Control Plan for the City of Flint. These plans matches the set of plans that was submitted to your office in hard copies on Friday. This submittal is somewhat modified from the set that was submitted to you on Thursday night/Friday morning. We will address the questions you raised and respond on Monday. Please let me know if there are other comments that needs our attention. Thanks for your prompt and quick response to our submittal. Samir F, Matta, PE Team Leader Lockwood, Andrews & Newnam, Inc. ALLO SN DALY COMPANY 1311 South Linden Road, Suite B « Flint, MI 48532 2121 University Park Dr, Suite 100 « Okemos, MI 48864-6901 D 517.819.2367 C 517.819.2367 www.lan-inc.com « ta@lan-| CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and ail attachments, (collectively, this “Communication’), is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential and/or proprietary. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited, If you have received this Communication in error, please contact the sender immediately and destroy any and all copies of this Communication. xxxEND_PAGE:deq04_b575_5314_5665_117 “City of Flint, MI fo4 Flint Water Treatment Plant S/ Phase II, Segment IV - Corrosion Control 4500 North Dort Highway, Flint, MI 48505 a 7 T EE = J + iq T El =e, Uc e AE : ) a B==eN yi XQ = fwd =a ] = Wf biden : /0-|o- 2015 | fa} == ; M/s : Jeremy N. Nakashima, P.E. Date Sa f ie Michigan Licensed Professional Engineer No. 6201058535 Expires October 31, 2016 Vicinity Map === Issued for: Permitting Issue Date: October 16, 2015 Lockwood, Andrews &Newnam, Inc. RES A OALY COMPANY cement 1311 South Linden Road, Suite B Flint, MI 48532 Tel 810-820-2682 Fax 810-820-2703 xxxEND_PAGE:deq04_b575_5314_5665_118 N30. 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Hi Mike, Please see attached plans for the Corrosion Control Plan for the City of Flint. | will have the official submittal package to you tomorrow afternoon after | get Brent or Mike’s signature on the permit application. | will call you when | get back in Lansing to drop the package. Is three sets of full size plans adequate? Would you like some half size plans? Let me know. Basis of Design ‘ Given that Flint will require lead and copper corrosion control and given that Detroit utilizes orthophosphate for their corrosion control methodology, and that Flint will be receiving Detroit water for the immediate future, orthophosphate ~ is the appropriate corrosion control methodology for Flint. A dosage of 0.8 mg/l as PO, has been recommended for the Detroit water. Numerous utilities utilizing Lake Michigan water have a target dosage of 0. 9 mg/l as PO,. Therefore, a target dosage in the range of 0.8 to 0.9 mg/l appears apptoptiates It is expected that, at least initially, there will be a significant PO, demand in the system. This will require a significantly higher dosage until this demand is satisfied and the target residual can be maintained. We are therefore designing for capability of a maximum dosage of 1.5 mg/l. xxxEND_PAGE:deq28_b107_0427_0429_2 t The arriving Detroit water will likely have some residual PO, when it arrives at Flint. It has been reported that this residual will be approximately 0.4 mg/I. The system must therefore be capable of a minimum dosage of 0.4 mg/l. Based upon the usage of 75% Phosphoric Acid and a flow range of 4 MGD to 25 MGD, with an average day of 16 MGD, ‘the expected feed rate will be 1.35 to 32 gpd. Average Phosphoric Acid feed is expected to be 10.8 gpd, requiring 30 days storage of 325 gal. 8 Orthophosphate will need to be applied at two locations. Detroit water will enter the Flint system at Control Station CS2, and supplementary phosphate will be applied there. However, on occasion some incoming water may need to be diverted to the Dort Reservoir, bypassing CS2. This water would theh be introduced to the system through High Service Pump Station PS4 and phosphate would be introduced at this location. Please let me know if the information is adequate or you require additional information. Thanks. Samir F, Matta, PE Team Leader JQ) weet A LEG A DALY COMPANY LEO A DALY COMPANY a 1311 South Linden Road, Suite Be Flint, MI 48532 2121 University Park Dr, ae s . OREM MI 48864-6901 . D 517.819.2367 Cj H * www.lan-inc.com @ stetaicacane Fe | ie CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication’), is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential and/or proprietary. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately and destroy any and all copies of this Communication. xxxEND_PAGE:deq28_b107_0427_0429_3

Samir, Three full sets if u can....otherwise half size set will suffice Sent from my iPhone

| Mike & Steve, | Thank you both for your efforts and quick response. We appreciate it. Take Care. | oF Samir Matta, PE Lockwood, Andrews & Newnam, Inc. (517)819-2367 wenreeee Original message --------

Samir, The GAC addition and sand filter media replacement for the filters at the Flint WTP is approved. Construction Permit # W 151055 issued on July 14, 2015 validates the approval. A hard copy of the permit along with a set of approved plans and specifications will be mailed out today and you should receive the set within the next few days. This e-mail; however, acknowledges issuance of the DEQ construction permit; thus construction work pertaining to this project may proceed. If you have any further questions, please don’t hesitate to contact me. Michael Prysby, P.E. District Engineer Office of Drinking Water and Municipal Assistance 517 290-8817

Hi Mike, As per our phone conversation, Calgon is pumping the wet sand into a truck with screened valves in the back that allows the water to drain out while keeping the sand in the truck. The removed materials is trucked to a landfill for disposal. The new sand comes in large bags that is dumped into a hopper and pumped back into the filter after water is added to the system. | have included photos of the sand being pumped out into the truck for your review. We also like to have the plant facility remain at 36 MGD and not change to 30 MGD even though we do not expect the City demands to get that high. Let me know if you need anything else. Samir F. Matta, pe Senior Project Manager xxxEND_PAGE:deq04_b579_6765_7195_099 Lockwood, Andrews . & Newnam, inc, A LEO A OALY COMPANY 2121 University Park Dr, Suite 100 « Okemos, MI 48864-6901 T 517.203.5437 _D 517.203.5437 www.lan-inc.com * [email protected]

Samir, The revised plans received from you this morning along with the response and attachments

Sound Good, Mike. Thanks. Samir F. Matta Senior Project Manager Leckwoued, ieee & Newnam, In ARE O aay & 1311 South Linden Road, Suite B » Flint, MI 48532 2121 University Park Dr, Suite 100 * Okemos, MI 48864-6901 D 517.819.2367 C £ 7 wwwilan-inc.com ¢ [email protected] ANE

3:30pm should work and would give us an hour or so....unless | hear differently fram Steve, | will schedule ft. Michael Prysby, PLE. District Engineer Office of Drinking Water and Municipal Assistance 5417 290-8817 Sent: Thursday, May 21, 2015 12: 6 PM

Samir, We are not involved with the selection of a contractor for the upcoming work. The described approach is agreeable provided that the design, materials used, and method of installation is approved and permitted by our office in advance of the city making a financial commitment towards the system alteration. Please reference Sec. 325.1004 (6) of the Michigan Safe Drinking Water Act for further discussion of the permitting requirements for alteration of the water system. As we discussed, our office will review the design and, following our approval, issue a construction permit in a timely manner. If you have any further questions, feel free to contact me. Michael Prysby, P.E. District Engineer ; Office of Drinking Water and Municipal Assistance 517 290-8817

Hi Mike, As per our phone conversation, LAN has been working with the City to implement the recommendation from Veolia with regard to the conversion of the 12 filters at the plant by replacing the 18” Anthracite with new GAC Media. Due to the time frame limitation, We have discussed with the City that sole sourcing the GAC purchase and installation may be the only chance for us to accomplish the work on time as the system will need to be in place by early July in order to give the City 5-7 weeks of treatment time with the new media before the August sampling. The City is looking for us to provide a turn-key delivery method in order to insure that we can acquire a vendor while performing the design and going thru your office for permitting. Let us know if you agree with the approach or if you recommend a different method. Your prompt response is greatly appreciated. Samir F. Matta Senior Project Manager Prekwond, Andrews &Newnam;,Inc. Inc. A A LEO A DALY COMPANY A DALY COMPANY 1311 South Linden Road, Suite B » Flint, Mi 48532 2121 University Park Dr, Suite 100 » Okemos, MI 48864-6901 D 517.819.2367 517.819.2367 www.lan-inc.com * [email protected] xxxEND_PAGE:deq04_b575_5314_5665_308 Rennaker, Joanne (DEQ)

Samir, You are correct, the section under vacuurn would net be Schedule SO steel, only sections that are under pressure as listed in 10 States Starlards. Sorry for the confusion, Stephen Busch, PLE. Lansing and Jackson District Supervisor Office of Drinking Water anc Municipal Assistance MOEG 5L7-G43-23414

Hi Mike, Does the piping have to be schedule 80 steel as our system is under vacuum and not under pressure as required by ten states standards? Thanks. Lockwood, Andrews & Newnam Samir Matta, PE (517) 819-2367 Samir, Attached are our comments pertaining to submittals received for Phase II — Segments | and II for the Flint WTP. If you have any questions concerning our comments, | will be available till close of business today to discuss with you. After today, you will need to contact Steve Busch concerning any questions regarding the Flint WTP project. | will return from vacation on Monday April 21*. Michael Prysby, P.E. District Engineer Office of Drinking Water and Municipal Assistance 517 290-8817 xxxEND_PAGE:deq11_b459_1955_1956_1 <Pre-lim Eng Reports - DEQ Comments ILI April 2, 2014.doc> CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication”) is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential or subject to copyright. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately. If this Communication was received in error, you are directed to immediately delete and/or destroy all copies. xxxEND_PAGE:deq11_b459_1955_1956_2

Hi Mike, Please see the options below. Let me know which is your preference. Thanks. Samir F. Matta Senior Project Manager Lockwood, Andrews & Newnam, Inc, A LEO A DALY COMPANY D 517.819.2367 517.819.2367 www.lan-inc.com * [email protected]

StormTech System.pdf HiAll, As requested, the following two concepts are being discussed with the City and ultimately with the contractor to see which one is more in line with the project budget and can be accomplished in a timely matter. The attached concept shows sheet piling being proposed which will be terminated at the designated height needed to achieve a 2’ freeboard along the alignment highlighted in RED. - The other concept which we discussed on the phone will entail using a light weight storm chamber (see attachment) fastened to a 4x8 plywood sheeting, attached together, with a geotextile fabric along the back side to follow the same alignment as the sheet piling option. It will be placed directly on the existing lime sludge in front of the disposal area for separation. . Please review, let me know if you have any questions and we can further discuss on Monday. Thanks. Samir F. Matta, pe Sentor Project Manager fn, & hogkuod, Andrews Nowra &Newnam, Inc. KCEO A OALY COMPANY. 2121 University Park Dr, Suite 100 » Okemos, MI 48864-6901 T 517.203.5437 517.203.5437 C 517.819.2367 www.lan-Inc.com « [email protected] CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and alt attachments, (collectively, this “Communication”) is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential or subject to copyright. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. !f you have received this Communication in error, please contact the sender immediately. If this Communication was recelved in error, you are directed to immediately delete and/or destroy all copies. xxxEND_PAGE:deq09_b3_109_205_92 Flint WTP Improvements Bray Road Lime Sludge Lagoon MDEQ Comments March 21,2014 - The placement of the proposed liner and berm fails to establish physical separation between the lime sludge collection area and concrete fill area. For complete separation of these areas, the berm needs to be constructed down to native soil. As proposed, this appears to constitute the first step towards a “cap-in-place” of the existing materials. If waste is left in place within the berm, the city will be required to construct the berm to meet Part 115 cap requirements. In addition, long term groundwater monitoring, financial assurance, closure and post closure plans will be required. Please provide a residuals management plan for the lime sludge collection area. In additional to removal of new lime sludge produced, the plan must also include the gradual removal of existing lime sludge: : The working depth of the lime siudge collection area does not appear to meet 10-States Standard’s minimum depth of 5 feet. The available volume appears to be 60,000 cubic yards based on 2.6 feet of working depth. Please confirm this. What is the surface area of the lagoon? Please provide a basis of design that includes the amount of lime sludge produced at average day . demand and the available days of storage at this production rate. These parameters will need to be used towards developing the residuals management plan. Finally, an acceptable residuals management plan is needed for us to considera deviation from the 10-State Standards guidelines. An effluent sampling point needs to be provided for decant water. n xxxEND_PAGE:deq09_b3_109_205_93 Gite) Her fnesr 211 19f0. Use 3eanu/t a € C64 A3/)3 LAN Regart : fo | = 50,08 vd ° 2 (3 MYA “as CACO, | : 4 mod ane, Biz fro q { - ; D LSB Jb Ae rray el BASIS OF DESIGN @ es ; * BRAY ROAD LIME SLUDGE DECANT WATER TREATMENT SYSTEM /o Gheles T Attest IME U/ (be (4 KOA vasP CITY OF FLINT ; . Te . ‘ ° 3 1, GENERAL DATA : ASSES p Setey The City of Flint (City) proposes to use the existing lime sludge storage lagoon facility at Bray Road - _ for the next 2.5 years on a continuous basis while the Karegnondi Water Authority (KWA) water -7FAK WM 6D *% QeoG. homniveh _ SFA system is being constructed. After which, the facility will only be used should the Flint WTP have Vero . to treat Flint River water on an emergency basis. In order to maximize storage volume of the basa on SEF 4 eft . facility, the City proposes to construct a decant tower structure, pump station and forcemain to . transport the decanted ‘water from the lagoon to a nearby sanitary sewer for final disposal. A CO, feed system is also proposed to neutralize the high pH decant waste stream prior to pumping to the (we hove ; 2-6 er cagA —_— | q A sanitary sewer. The existing lime sludge storage lagoon facility at Bray Road does not have multiple cells; ; : therefore, the sludge will be continuously weited and will only consolidate to approximately 25% i solids. The lime sludge and decant waste stream flows are summarized in the table below: . i Lime Sludge Quantities Summary SA> 8 30,50 ey WTP Flow Sludge Produced’ Sludge Stored Decant Waste Decant Waste &. 1G Nor aL / Bb Ses & te “ . [MGD] (3% Solids) < (25% Solids) to Sewer to Sewer ~ Isp). Icy/day] gpd (gpm <s a | Ream : [Se VA ; Average Day : nse 92,000 : 5! a 80,700 56 | J Current Max Day 8 165,000 eS 145,200 100 4 Prop. Max Day . 24 220,000 , 131 193,600 - 135 “a bere vt _ Go> DAS “FAL 1069 K (SOx ‘ - v4 Oey — , / al 2. CO, FEED SYSTEM fe tery “te hf, AS yb-t . &* A4/ ate i i ; 4 ; a. Process Description : ears , A gaseous carbon dioxide feed system will be installed .on the Bray Road site near i Lax : the decant pump station. The system will include a liquid storage.tank, vaporizer, : zg (> vapor heater, pressure regulator, pH control panel and a gas diffuser. Liquid CO, i es [+ ‘\ t will be stored in a 6-ton tank and regulated through a vaporizer. The gaseous CO, : pelt will be sent through diffuser piping and released into the decant tower through two VALE gd: is > olin (2) 7” diameter disk ceramic diffusers. A pH probe will be located in the decant = ° . tower to monitor pH downstream. of the CO, injection point. The pH probe will ‘ transmit the pH reading to the pH control panel, which will regulate the CO, feed ‘ @ 156 — sy (534 ay /D A/ 4 ; : rate for set point control of the pH in the decant water waste stream. i 13/ AND . eos “ Ly mgd —S : b. Design Criteria gste ! 157 geet : | | Lag 7 * Max CO, feed — 200 mg/L . . , . ‘ ° Max decant flow rate — 140 gpm [-25 f , / sp! \ @ tb ngd =— \ bowe yh = ABATE ak [ye [at SE /DK/ AgL Saf & . xxxEND_PAGE:deq09_b3_109_205_94 1 ° CO, feed system capacity @ Max Day (140 gpm) 140gpm_ 8.341b Fae ered * 200ppm C02 rn 336 lb/day . CO, feed system capacity @ Average Day (60 gpm) 60 : b San gH + 200ppm CO, * = 144 lb/day 94-4 GD . CO, storage for minimum 30 days at Average Day per 10 States Standards 1442» 30 days = 4,320 lbs = 2.16 tons day é. Equipment _e One (1) 6 ton capacity Liquid Carbon Dioxide storage tank system complete with refrigeration unit (6 tor is minimum for CO, delivery by tanker truck) One (1) 12 kW electric vaporizer One (1) vapor heater | One (1) First stage CO, pressure regulator One (1) Carbon Dioxide pH control panel One (1) Carbon Dioxide gas diffuser assembly i One (1) pH Transducer : ‘ Two (2) 7” Diameter Ceramic Disk-type diffusers 3. DECANT TOWER a. Process Description The decant tower is a 6’x6’ precast manhole with three (3) 12”W x 36”H staggered openings that will provide 9’ of total operating depth for decanting. Each opening has an interior wall-mounted inverted slide gate with a manual operator and an external stoplog channel to allow maintenance on the slide gate when necessary. ' i An under-flow baffle wall will be installed to promote CO, transfer into the decant . waste stream and prevent short circuiting. A pH probe will be installed just below the invert of the 8” gravity pipe to the decant pump station. b. Design Criteria . , 7 f | : ‘e Average day flow rate = 60 gpm . Peak day flow rate = 140 gpm xxxEND_PAGE:deq09_b3_109_205_95 ee Flint WTP Phase Il, Segment II Lime Residual Disposal Flint Mt, 48505 4 = ce = == KR teo a DALY COMPANY, Lockwood, Andrews| i on &Newnam, Inc. rlansane ENGINEERING ogre peer 1311 South Linden Road, Suite B i Flint, MI 49532 ‘Vel 610-820-2682 Fax 810-820-2703 \ ROWE PROFESSIONAL SERVICES COMPANY Fina mast — FREEBOARD ELEVATION: 744.6 We " Pnorosep une EVO TNE KEY PLAN = aa SURFACE AREA OF LAGOON ( ~\ ‘ WITHIN PROPOSED LIME \ a ELEVATION BOUNDARY, = LE-~™—\ J 830,000 SFT (19 ACRES) i" |FREEHOARO ELEVATIONS 7448 Py, a ~~ f PROPOSED LINE ELEVATION: 738." y { i. REVISIONS wv | a Cosa on FREEBORAD ELEVATION: 74.8 2 fT ire DRAWINGS\,.. ay faa a ai Ag p= q FILE LOG FREEBOARD ELEVATION: 741.6“ dt - - aw) ui heme [a H om [| i) Fal = ™ Wie i awa aS nH A Ih \ aaer EXISTING CONCRETE ANO DEBRIS FREEBOARD ELEVATION PILING TO EXCEED FREEBOARD ELEVATION Ss PROPOSED LINE SLUDGE i EXISTING ‘UME SLUDGE Project No, 130-10701-001 Date: February 28, 2014 Drawings\gray Rood Lime Lagoon Drawings\Piling Concept.dug Plotted:3/25/2014 2:49 PM By:Kevin Janes Ise: PW; \\LADPW.LADCO.INT: PROJECTWISE\OOCUMENTS \PROJECTS \130—10701—001 \4—0— PRODUCTION \4—01. 3-5 FE foun | . / BUD ADALY Gomrpany 2014 xxxEND_PAGE:deq09_b3_109_205_96 Designed to meet the most stringent industry performahce standards for superior structural integrity while providing designers with a cost-effective method to save | valuable land and protect water resources. The StormTech system is designed primarily to be used under parking lots thus maximizing land usage for commercial and municipal applications. StormTech MC-3500 Chamber (not to scale) 7 StormTech MC-3500 End Cap (not to scale) Nominal Chamber Specifications '. Nominal End Cap Specifications Size {Lx Wx H) 90" (2286 mm) x 77" (1956 mm) x 45" (1143 mm). \ Size (Lx W XH) 26.5" (673 mm) x 71 (1803 mm) x 45.1' (1145 mm} Chamber Storage 109.9 #? (3.14 m'} End Cap Storage 15.6 fi? (0.44 m°} Min, installed Storage* 178.9 ft? (5.05 m') | ; Min. Installed storage! 46.9 ff (1.33 m?) Weight 134 Ibs (60,8 kg) *) Weight 43 Ibs (19.5 kg) “This assumes a-minimum of 42° (305 mm) of stone above, 9° (229 mm) of stone below +: *This assumes a minimum of 12* (305 mm) of stone above, 9" (229 mm) of stone below, stone porosity. chambers, 9° (229 mm) of stone between chambers/end caps and 40% stone porosity. t "6" (152 mm) of stone perimeter, 9* (229 mun) of stone betveen chambers/end caps and 40% i Shipping 15 chambers/pallet 16 end caps/pallet 7 pallets/track 22.6" (574 mm) INSTALLED 45.1" (1145 mm) 26.1 (673 mm) 90,0" (2286 mm) L 71.0" (1803 mm) [--——— 86.0" (2184 mm) INSTALLED 45,0" (1143 mm) 77.0" (4856 mm) Call StormTech at 888.892,2694 for technical and product information or visit www.stormtech.com 13 xxxEND_PAGE:deq09_b3_109_205_97

Hi Mike, i thought we shared the basis of design information with you but it seems did not so here itis. The City would like to have a sit dowr meeting tomorrow or Thursday afternoon either at your place or City Hall. Are you guys available? Piease jet me know. Thanks. Samir F. Matta Senior Project Manager

\ Samir, Attached are MDEQ’s comments regarding the proposed work at the Bray Road site to allow re-use of the site for the disposal of WTP lime sludge. Please contact me at your earliest convenience if you have questions regarding our comments or wish to schedule a meeting. Michael Prysby, P.E. District Engineer Office of Drinking Water and Municipal Assistance 517 290-8817 CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication”) is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential or subject to copyright. Any 1 xxxEND_PAGE:deq16_b4_0688_0891_120 unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately. If this Communication was received in error, you are directed to immediately delete and/or destroy all copies. xxxEND_PAGE:deq16_b4_0688_0891_121

Hi Mike, Does this address your needs for the “current yard piping diagram”? The language below was also used for the addendum that the City issued to the contractor for the Mid-Point Clorination 1. Sheet C-104 — Construction Notes: Add the following Note 6 — A 1” Anti-syphon / Back Pressure Valve and additional 1” ball valve shall be added just prior to the trough wall penetration. The anti-syphon / back pressure valve shall be PVC and designed for use, with chlorine systems. The valve shall be a LMI #35856, Walchem E90422, or engineer approved equivalent. The valve shall be installed between the two 1” ball valves to allow for isolation during servicing. The valve shall be located above the high water level in the trough. The Contractor shall install a 1” drain line from the relief port to the finished floor elevation of the pipe gallery. ‘Jeremy will provide written responses for your file on the other questions as requested. Thanks. Samir F, Matta Senior Project Manager jan -poekwoad, Aagraws i% pa Soa Tair ——_ D 517.819.2367 C 517.819.2367 www.lan-inc.com « [email protected] CONFIDENTIALITY AND PRIVILEGE NOTICE: This email communication, including any and all attachments, (collectively, this “Communication”) is intended solely for the person(s) to whom it is addressed. This Communication may contain information that is privileged, confidential or subject to copyright. Any unauthorized use, disclosure or copying of this Communication is strictly prohibited. If you have received this Communication in error, please contact the sender immediately, If this Communication was received in error, you are directed to immediately delete and/or destroy all copies. xxxEND_PAGE:deq09_b3_109_205_42 Principle of Operation For a particular ejector back pressure, a minimum water supply is required at the ejector inlet to create vacuum at a level strong enough to operate the chlorinator. This vacuum originates in the throat of the ejector’s Venturi nozzle and after opening the ejector check valve, extends into the body of the chlorinator. There it causes the regulating diaphragm to open the inlet safety valve, allowing gas under pressure to pass into the drip leg where the initial liquid is collected. A heater attached to the drip leg evaporates the liquid that Is-in the eduction tube of the gas valve on startup of a new ton container. This heater remains on constantly, permitting only gas to flow to the vacuum regulator. As it flows across the inlet safety valve assembly, it is filtered and reduced to a vacuum. The gas then enters a chamber where . the vacuum level is maintained by a spring- opposed, sealed regulating diaphragm. It is then drawn through the chlorine flow meter, across the rate control valve and on to the ejector where it dissolves in water. The resultant, highly concentrated solution exits at the ejector outlet and flows to the desired point of application. Accuracy Flow meter accuracy is within 4% of the meters maximum capacity, Capacities Available Maximum total operating rate is 500 pounds per day (10,000 grams per hour). Minimum feed rate is 5% of maximum, Installation of Hydro Gas Chlorinators Units of the Hydro Gas Chlorinator System can be used for practically any require- ment. The schematics show various types ” of installations using single or multiple containers as well as application of chlorine to pool, basin or pipeline...direct or remote. Basic Hydro gas chlorinator units are simply combined to cover all applications. CHLORINATOR SIZE SHOULD BE BASED ON MAXIMUM POSSIBLE FLOW, GPM x 0.012 x (PPM) Dosage = PPD Example: ° 600 GPM x 0.012 x 3 PPM = 21.6 PPD In this example a Hydro 50 PPD chlorinator would be adequate. WEEE, i) LG, ty zm Le aw 57 HYDRO Series 700 Chlorinator A ton ironwork* is used to mount the Hydro chiorinator directly to the container. This eliminates all pressure lines. Chlorine gas is taken under vacuum to the point of injection. This eliminates pressurized solution lines. Operator Indicator During operation the indicator window remains gray; red indicates depletion of the chlorine source. Inlet Safety Valve Spring opposed safety valve seals off chlorine in container upon loss of vacuum. Safety valve is encapsulated to permit quick disassembly and cleaning without special tools. Hydro Series 700* ton-container mounted gas chlorinators are de- signed for manual or semi-automatic operation to meet the highest standards of reliability. They incorporate ad- vanced design features gained through years of research and in-the-field ex- perience. Simplified design and fewer * parts mean less maintenance, lower cost with better performance, reliability and long life. Inlet Sealing Valve A sealing valve at the chlorinator inlet closes if chlorine supply is interrupted or depleted, sealing the entire vacuum system. Dirt or moisture cannot enter the system when containers are changed. Regulating Diaphragm Constant vacuum level is maintained inside the chlorinator by the diaphragm which is O-ring sealed along its entire inner and outer surface to prevent leakage or warping of parts from excessive tightening of the body bolts. 500 PPD systems with one or more wall mounted remote meter(s) (701, chlorinator body(les), The prica is reduced if the customer wishes to receive chlorinator(s) with no meter assembly(ies) ("blanks at the source (only at the wall mounted remote meter) and on automatic standby systems one will not be able to visually deter Cl, Hydro Mode! 700 Single-Point Application Hydro chlorinator mounted on a single container with direct ejector to pipeline or basin. - Chlorine capacity to 500 PPD (10,000 grams/nr). © Vent to safe outside location “The Series 750 is the same as the Series 700 but without the ton ironwork. The Series Sra Hydro Model 701 Remote Meter for Single Point of Application Hydro chlorinator mounted on a single. container feeding a remote wall mounted meter with rate valve supplying a single ejector. Chlorine capacity to 500 PPD (10,000 grams/hr). xxxEND_PAGE:deq09_b3_109_205_43 HYDRO Eu-5000 Ejector The Hydro ejector utilizes a specially © designed O-ring seal check valve which prevents the backflow of water into the chiorinator, The ejector operates on a ven- turi created by water passing through the ejector nozzle causing the spring opposed diaphragm check valve to open and mix the chlorine gas with the water. The ejector should be supplied with reasonably clean water at temperatures below 80°F (27°C). The Hydro ejector is made of durable materials that are resistant to wet and dry chlorine gas use. HYDRO RM-701 Remote Meter — Any number of Hydro Remote Meters may be used in an Installation if required. Only the vacuum line is required to the individual ejector which it supplies. Chio- tine gas can then be precisely metered at each remote location. If more (or less) is required at one location the meter is simply set at the desired level for that location, By this control of metering at remote loca- tions a perfectly balanced system‘can be maintained. Hydro Remote Meters are practically maintenance free. Hydro Re- mote Meters use a solid silver rate valve. Flow meters are accurate to +4%. RNAS INSTRUMENTS 600 Emlen Way, Telford, PA 18969 ® Telephone: (215) 799-0980 ® Fax (215) 799-0984 Toll Free in the U.S.: 1 (888) 38-HYDRO ® www.hydroinstruments.com ©@ HYDRO SW-500 Automatic ——— Switchover . Multiple chlorine containers, which prolong the time span before depletion, are easily installed and automatically switch over