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Villas at LV-CS050225 Lac. Y Construction Civil Constcuction As Planned www. lh[acy, com Febmary25,2005 Mr. Larry Davis City of Coppell P.O. Box 478 Coppell, Texas 75019 Re: Villas at Lake Vista, Phase One Coppell, Denton County Dear Mr. Davis: Please allow this letter to serve as a formal request for permission to erect and operate a temporary concrete plant on the above-referenced project. Enclosed please find copies of an area map indicating the area required. Please mark your approval on one copy and return for our files. Thank you for your cooperation and immediate attention to this request. Sincerely, Benjamin Young Assistant Production Analyst L. H. Lacy Company 1880 Crown Road RO. Box 641297 T: 214.357.0146 Dallas, Texas 75234 Dallas, Texas 75354-1297 F: 214350.0662 Lac. Y Construction Civil Construction As Planned www. lhlacy,com COPY Febmary25,2005 Mr. Tony L. Walker Air Program Manager Texas Commission on Environmental Quality 2301 Gravel Drive Fort Worth, TX 76118-6951 Re: Villas at Lake Vista, Phase One Coppell, Denton County LHL Plant No. 11-014 Acc. Id. No. 92-1510-T Regulated Entity No. RN102738788 Permit No. 26969 Dear Mr. Walker: Enclosed are the copies of the information on the proposed plant site for the above-referenced project. We request permission to erect and operate our previously permitted plant referenced above for the completion of this public works project. Site map and details for this public works project are included. If you require additional information, please feel free to call me. Sincerely, Benjamin Young Assistant Production Analyst L.H. Lacy Company 1880 Crown Road P.O. Box 541297 T:214.357.0146 Dallas, Texas 75234 Dallas, Texas 75354-1297 F: 2143500662 Lac. Y Construction Civil Construction As Planned wvwv. lhlacy, com February25,2005 Texas Commission on Environmental Quality Mr. Tony L. Walker Air Program Manager 2301 Gravel Drive Fort Worth, TX 76118-6951 Re: Permit # 26969 Air QualityAcct. ID.# 92-1510-T Regulated Entity#RN102738788 The following are the procedures for the production of concrete for this portable concrete plant: 1) Raw material is delivered to the site by trucks. 2) Material is stored in stockpiles or silos. 3) Stockpiled material is carried to the plant by wheel loaders. 4) Dust emissions from this operation are controlled by water sprinkling. 5) Silo stored material is carried to the weigh hoppers by enclosed augers. Dust emission from this operation is controlled by venting to the central bag house. 6) Weighed material and water are discharged into the central mixing drum and thoroughly mixed. Dust emissions from this operation are controlled by venting to central bag house. 7) Mixed material is discharged into open top dump trucks. 8) Dump trucks deliver the material to the spreader. Should you require additional information, please feel free to call me. Sincerely, Benjamin Young Assistant Production Analyst L. H. Lacy Company 1880 Crown Road P,O. Box 541297 1:214.357.0146 Dallas, Texas 75234 Dallas, Texas 75354-1297 F: 214.350.0662 TABLE 11 FABRIC FILTERS Point Number (from Flow Diagram) Manufacturer & Model No. (if available) Hagen 1083 jet pulse Name of Abatement Device Cloth Filtering Baghouse Type of Particulate Controlled Cemenh Sand, Aggregate and related Dust GAS STREAM CHARACTERISTICS Flow Rate (scfm) Gas Stream Particulate Grain Loading Temperature (F) (grain / scl) Design Max Average Expected Inlet Outlet 6500 6350 ambient 5 .01 Pressure Drop water Vapor Content Fall Requirements (H20) of Effluent Stream (bp) (ft3/min) (lb. water/lb, dry air) 4.55 N/A 15 6500 PARTICULATE DISTRIBUTION (By Weight) Micron Range Inlet Outlet 0.0 0.5 100 % 100 % 0.5 1.0 99.98 % 99.98 % 1.0 5.0 % _ % 5 10 % % 10 20 % % over 20 % % FILTER CHARACTERISTICS Filter Velocity Bag Diameter Bag Length Number of Bags No. of Compartments (scfm/ft2 of cloth) (in.) (fl) in baghouse 6: 1 6" 7' 0" 99 1 Bag Rows will be Staggered Straight Filtering Material: Polyester Fume Describe Bag Cleaning Method and Cycle: Venturi for pulse air ~ 90 psi Capitol Installed Cost $ 25,000.00 Walkways will be provided between banks of bags YES NO Air Header, Diaphragm Valve, Blow Pipe Annual Operating CostS 350.00 ADDITIONAL INFORMATION On separate sheets attach the following A. Details regarding principle of operation B. An assembly drawing (Front and Top View) of the abatement device dimensioned and to scale clearly showing the design, size and shape. If the device has bypasses, safety valves, etc., include in drawing and specify when such bypasses are to be used and under what conditions. TABLE 20 CONCRETE BATCH PLANTS PAGE 1 1. What type of plant? (check one) -- Permanent XXX Portable 2. What type of hatching will be accemplished? (Check one) --. Wet (rotary mix trucks) Dry XXX Cen~al Mix 3. Maximum Production Rates: 250 cyds/hour cyds/year Does the facility operate at night __ Yes XXX No 4. Cement/Flyash/Additive silo Information a) How many silos will this plant have? 2 b) What is the volume of each silo? 200 bbl cu.ff. 2g0 bbl cu.ff. __ cu.ff. c) Explain method of loading silo(s) ~nsumaflc transfer d) Is each silo equipped wfth over load warning devices? XXX Yes __ No Please describe: Light and Horn e) What type of abatement device will be used on silo vent(s)? vented to main evetem f) if baghouses ara used on the vent(s), for each device submit the following data and attach a Table 11. I. Flow rate 600 cfm Total filtedng area 2080 sff Air to cloth ratio 35:1 Outlet grain ~oading 0.01 gr/dscf Method of cleaning bags Jet pulse air Automatic (not manual) sequenced cleaning? XXXYes__ No Il. Flow rate 600 cfm Total filtering area 2080 sff Air to cloth ratio 35:t Outlet grain loading 0.01 gr/dscf Method of cJeaning bags Jet Pul~,e air Automatic (not manual) sequenced c~eaning? XXX Yes __ No II1. Flow rate -- cfm Total filtedng area sff Air to cloth ratio __ Outlet grain loading gr/dscf Method of cleaning bags Automatic (not manual) sequenced cleaning? __ Yes -- No 5. How will the batch drop to truck or central mixer be controlled to prevent dust emissions? XXX Suction shroud with exhaust air to central baghouse? (complete the following and attach Table 11 Flow rate 4000 c[m Total filtering area 24000 sft Air to cloth ratio 6:t Outlet grain loading 0.01 gr/dscf Method of cleaning bags Jet pulse air Automatic (not manual) sequenced cleaning? XXXYes __ No __ Flexibile Discharge Spout with Water Fog Ring (attach design drawing) Other type of abatment device (explain in detail and attach design drawing) 6. The cement weigh hopper will be vented to the: (Pick one) __ Cement / F[yash Silo Baghouse XXX Central Baghouse Other: Discharge spout 7. List all additives or ad-mixturas and maximum usage rates at your facility: Air 40, NW Provide additional information on any items requested above in this space: TABLE 20 CONCRETE BATCH PLANTS PAGE 2 8. Willthesandandaggregatebewashedpdortodelivenjatyoufacil~ XXXyes no? 9. The number of acres or square feet which may be covered by aggregate stockpiles: 1 acre ? 10. Explain the method of moving aggregate from storage piles to the mixing area (in detail): Rubber tired loader from the stockpile to the plant 11. Will water sprays be used at the following locations? a) Stockpiles XXX yes __ no b) Aggregate bin outlets yes XXX no c) Conveyor transfer points yes XXX no d) screens yes XXX no 12. Plant roads will be: Paved & Cleaned __ Paved & Vacuumed __ __Gravel ChemicatSprayed XXX Water Sprinkled OilCoatsd 13. Aggregate transport trucks have: XXX Beds covered by Tarps A sprinkler system 14. Please provide the following information for all vechiles which travel on plant property Vechile Type Speed Raw aggregate $ mph 15 Weight (tons) Number of Empty Full Wheels 4O I~ Distance Traveled per round trip (miles or feet) Paved Unpaved 300 ff Loaders 5 mph 23 2.~9 _4 lS0it Cement Tankers 5 moh J_~.5 40 t~8 3OO It Flyash Tankers 5 mph 1._[5 40 t_~8 300 ff Additives $ moh 1__5 40 1__8 300 It < 1 mile < 1 mlfe Mix Trucks 5 mph 1._~0 28 10 if used Dump Trucks S mph 10 I._~8 i_gO NOTIFICATION OF INTENT TO MOVE A PERMITTED TRANSIENT FACILITY Company Name: Address: Person in charge: Telephone number: Type of facility: L. H. Lacy Company P. O. Box 541297 Dallas, Texas 75354-1297 Josh Lowry (214) 357-0146 Portable Concrete Plant a. Account identification number: 92-1510-T b. Permit Number: 26969 c. Regulated Entity Number: RN102738788 Quantity and type of air pollution control equipment: Baghouse and water sprinkling Location plant is to be moved from (city, county, exact location description): Averitt Express Parking Expansion~ Grand Prairie~ Dallas County, Texas. Approximately 50 feet South of existing Trinity Blvd. and 1119 feet East of existing Hardrock Road. Location plant is to be moved to (city, county, exact location description): Villas at Lake Vista~ Phase One~ Coppeil~ Denton County~ Texas. Approximately 217 feet South of existing Lake Vista Drive and 1125 feet East of existing MaeArthur Bonlevard. See attached map. 7. Area map showing location of new site: Attache~. 8. Proposed date for start of construction: May 3~ 2005 9. Proposed date for start of operation: May 8~ 2005 10. Expected length of time at new location: 45 working days Has a copy of this notification been sent to the regional office of the Texas Air Control Board having jurisdiction over the area to which this plant is to be moved? YES XX NO It is hereby agreed that the facility identified herein will not be constructed at the proposed site or any other site until authorization is received from the Executive Director of the Texas Air Control Board. Date February 25, 2005 Signature Name Benjamin Young Assistant Production Ana .lyst N SCAL (.-