AQ_F_0400045_20150911_CMPL_InspRpt

NORTH CAROLINA DIVISION OF Fayetteville Regional Office
AIR QUALITY Hildreth Ready Mix,LLC
NC Facility ID 0400045
Inspection Report County/FIPS: Anson/007
Date: 09/17/2015
Facility Data Permit Data
Hildreth Ready Mix,LLC Permit 08715/G03
City Pond Road-SR 1142 Issued 7/30/2013
Wadesboro,NC 28170 Expires 6/30/2018
Lat: 34d 55.4970m Long: 80d 5.9570m Classification Small
SIC: 3273/Ready-Mixed Concrete Permit Status Active
NAICS: 32732/Ready-Mix Concrete Manufacturing Current Permit Application(s)None
Contact Data Program Applicability
Facility Contact Authorized Contact Technical Contact SIP
Karl Hildreth Karl Hildreth Karl Hildreth
Owner Owner Owner
[phone] [phone] [phone]
Compliance Data
Comments:
Inspection Date 09/11/2015
Inspector's Name Mike Thomas
Inspector's Signature: Operating Status Operating
Compliance Code Compliance-inspection
Action Code FCE
Date of Signature: _ On-Site Inspection Result Compliance
Total Actual emissions in TONS/YEAR:
TSP S02 NOX VOC CO PM10 *HAP
2012 0.7200 --- --- --- 0.2200 0.0610
2007 0.8240 --- --- 0.2410 0.0700
*Highest HAP Emitted(n ounds)
Five Year Violation History:None
Date Letter Type Rule Violated Violation Resolution Date
Performed Stack Tests since last FCE:None
Date Test Results Test Method(s) Source(s)Tested
L_
1) Location
Hildreth Ready Mix is located on City Pond Road, south of Wadesboro, in Anson County.

Directions
In Wadesboro,take HWY 742 south for 3.5 miles to City Pond Road on the right. Hildreth Ready Mix is
approximately 2 miles on the right. If no one is at the plant take Hildreth Rd which is just past plant up to
the big metal building on the right. That is where the office is located.
Safety considerations: Standard DAQ safety equipment.Watch for truck traffic,although this is a small
facility,and there's usually not a lot of traffic at one time.
2) Facility and Process Description
Hildreth Ready Mix is a small batch concrete plant. This facility is permitted under Air Permit No.
8715G03,effective from 31 July 2013 until 30 June 2018.Mike Thomas conducted the last
compliance inspection on 31 July 2016.
Hildreth Ready Mix is a batch concrete plant. Cement is stored in a silo and mixed with aggregate
(stockpiled on site), sand(stockpiled on site), and water inside a cement truck. To produce the septic tanks,
cement is poured into 1,000 gallon, 1,200 gallon, or 1,500 gallon molds and allowed to cure for 28-30 days.
The molds are removed and septic tanks are delivered and installed on site.Although septic tanks are still
produced on site,most of Mr. Hildreth's business now is delivering concrete from his batch plant.
a) Permitted Sources
1. One(1)cement mixing weigh hopper and loading operation;and,
2. Silos for cement and flyash storage.
b) Insignificant/Exempt Activities
Source Exemption Regulation Source of Source of Title V
TAPs? Pollutants?
1I I sand and aggregate handling 2Q 0102(c)(2)(E)(i) No Yes
c) Throughputs for 2014
Employees: 3 (including drivers)(5 in 2013)
Hours: 8:00 AM—S:OOPM(same in 2013)
Production: —6000 yds'(-2,000 yds' in 2013, 3,397 yds'in 2012)
3) Inspection Conference
On 11 September 2015,I Mike Thomas of the FRO DAQ conducted a compliance inspection. I met with
Karl Hildreth, Owner. This was an arranged meeting to observe the plant in operation. We discussed the
following:
a) Verified the FACFINDER information;Mr. Hildreth is the sole contact for all data.
b) I checked the maintenance logbook,which contained accounts of daily truck load outs and monthly
records of baghouse inspections,which Mr.Hildreth performs. Mr.Hildreth stated that business had
been spotty but he did have a few large projects in 2014.

c) Mr. Hildreth described the improvements he recently made on his dust collection system. He has
replaced and re-routed most of the duct work in the system. These changes greatly increased the
amount of suction available during truck filling.
4) Inspection Summary
Mr.Hildreth had made arrangements for me to observe a silo fill and a truck load out during the inspection.
Mr.Hildreth owns a cement transport tanker and hauls and fills the silo himself. He also stated that he no
longer uses flyash in his concrete mix due to the expense. Mr. Hildreth fills the cement silo at 10psi. I
observed 0%V.E. during silo filling.
I also observed a truck load out during the inspection. The modifications Mr.Hildreth made to the dust
collection system at the truck load out made a significant improvement to the cleanliness of the operation.
Approximately 90%of the dust produced during a truck load out were captured by the system now. I
observed 10%V.E. during the filling operation.
5)Permit Stipulations
a) A.3 2D.0515 PARTICULATE CONTROL REQUIREMENT-Particulate matter emission rates
shall not exceed>30 tons/hour.
Appeared to be in compliance-Latest permit review shows compliance and there have been no
changes in facility operations since the last review.
b) A.4 2D .0521 VISIBLE EMISSIONS CONTROL REQUIREMENT- Visible emissions from sources
manufactured after July 1, 1971 shall not be >20% opacity and from sources manufactured as of July 1,
1971,VE shall not be more than 40%opacity.
Appeared to be in compliance—I observed 0%V.E. during a silo fill and 10%V.E. during a
truck fill.
c) A.5 2D .0535 NOTIFICATIONREQUIREMENT- The facility is required to notify DAQ if
excess emissions occur for more than a 4-hour period caused by a breakdown or other abnormal
condition.
Appears to be in compliance —The facility has had no exceedances, breakdowns, or abnormal
conditions requiring notification.
d) A.6 2D .0540 FUGITIVE DUST CONTROL REQUIREMENT-Permittee shall not allow fugitive
dust emissions to cause or contribute to complaints/excessive emissions beyond the facility's
boundary.
Appeared to be in compliance—I observed 10%V.E. during truck load outs. Mr. Hildreth was
not aware of any dust complaints. I described to him the two complaints FRO received. Mr.
Hildreth stated that the dust he was producing during truck fills was excessive prior to improving
his collection system(though his reason for the upgrade was to keep his trucks clean. He recently
spent several thousand dollars repainting all of the trucks in his fleet).
Based on what I observed the new modifications to the dust collection system should greatly
reduce fugitive emissions at the facility.
e) A.7 2D .0611 FABRIC FILTER REQUIREMENT—Particulate matter emissions from permitted
equipment shall be controlled by fabric filters,with recordkeeping of regular inspections and maintenance.
Appeared to be in compliance—I reviewed the logbook,which contained entries of
maintenance and repairs. Mr. Hildreth conducts preventative maintenance and inspections on a
quarterly schedule. Last annual inspection was 4 April 2015.

f) A.8 2D .1104 TOXICAIR POLLUTANT CONTROL REQUIREMENT—Facility shall not emit
arsenic that may cause an exceedance of the acceptable ambient level;minimum distance to property
line shall determine the maximum concrete production rate(35,000 yds3 for 75 feet);there shall be a
minimum distance to property line identification marker; Permittee shall record daily and monthly
concrete processed; Permittee shall submit summary report by March 1 of each year.
Appeared to be in compliance—I verified property line marker to be 75 feet;total concrete
production in 2014 was well below the maximum 35,000 ydS3;production records appear to be
compliant; annual report was submitted on time and compliant.
g) A.9 2Q .0310 GENERAL PERMIT CRITERIA—The Permittee shall only operate permitted
emissions sources; facility must be located in listed counties;maximum hourly throughput at truck
loadout must be< 138 yds3/hour;facility must not produce more concrete than allowed based on
"minimum distance marker".
Appeared to be in compliance—Facility is only operating permitted sources,facility is located in
- Anson County, latest permit review shows maximum throughput for facility is much lower than 138
yds3/hour, and latest annual report shows compliance.Facility only produced approximately 6,000 yd'
during 2014.
h) A.10 2Q .0711 TOXICAIR POLLUTANT EMISSIONS LIMITATIONS—Each TAP listed for
permit may not exceed TPERs(Beryllium<0.28 lbs/yr,Cadmium<0.37 lbs/yr, Chromium<
0.013lbs/day,Manganese/compounds<0.63 lbs/day, and Nickel metal<0.13 lbs/day).
Appeared to be in compliance—TPERs appear not to have been exceeded,based on current
production rates at facility. Facility only produced approximately 6,000 yd'during 2013.
6) 112R Status
This facility neither uses nor stores chemical compounds that require a written risk management plan
under the Clean Air Act, Section 112R.
7) Non-compliance History Since 2010
a) 28 May 2010—NOV for late reporting
8) Comments and Compliance Statement
Hildreth Septic Tanks appeared to be in compliance on 11 September 2015.
Pink sheet: None
/mst