Need to return call by / at/between and . Signature: ___________________________ Project No.: 0172.07.005.506 DISTRIBUTION

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Project Name: 304(m) Annual Review

TELEPHONE CALL RECORD

Outgoing Call Date: 8/27/2010 Time: 2:30 PM EST

Company Name: Oxea Bay City Plant (TX0006017) Contact Name: Sylvia Martinez, Oxea Bay City Plant

Phone No.: 979-241-4000

Name: Lauren Wingo Eastern Research Group, Inc.

GENERAL SUBJECT : Oxea Bay City Plant’s 2008 Chlorine and Flow Data in DMR



### TOPICS DISCUSSED AND ACTION TAKEN

I called Oxea Bay City Plant on August 25, 2010 at 3:00 pm and lef t a message with Ms. Sylvia Martinez indicating that I was calling regarding the 2008 chlorine and f low DMR data for outfall 001.

Ms. Martinez returned my call at 4:30 pm on August 25, 2010. Ms . Martinez indicated that the flow rate is measured at the final outfall for 001, but the chlorine is m easured at a different location. She indicated that the
flow rate where the chlorine was measured was different than the final flow rate. I reviewed the chlorine and flow data with Ms. Martinez (see Table 1 below). She ve rified all of the chlorine concentrations for outfall 001 in the 2008 DMR. She also indicated that in 2008 the plant h ad problems with the analyzer that controls the chlorine feed, so higher concentrations may have been a result of the analyzer problems. Ms. Martinez believe d the chlorine detection limit was 0.01 mg/L. Ms. Martinez said she would speak with other staff at the facility about any notes on the 2008 DMRs and would see if the plant measured flow at the location where chlorine is
monitored.

Ms. Martinez called at 5:20 pm on August 25, 2010 and left a mess age saying that she will be out of the office tomorrow but that I could contact Gladys and Joseph, als o of Oxea Bay City Plant, to discuss the follow-up questions.

I called Joseph from Oxea Bay City Plant on August 26, 2010 at 11:00 am while Ms. Martinez was out of the office. Joseph mentioned that there were problems with the Honeyhoe sewage treatment facility in 2008, although it was uncertain what those problems were. Jose ph explained that the effluent from Honeyhoe feeds into effluent from other process wastewater sources an d is sent to the cooling pond. Joseph indicated that outfa ll 001 does feed into the river and is a commingled stream.

I left a message for Ms. Martinez August 27, 2010 in the morni ng and she returned my call at 2:30 pm the same day. Ms. Martinez, along with Gladys, explained that Ho neyhoe is the name of the domestic sewage treatment plant. Ms. Martinez indicated that effluent from Hone yhoe flows into two equalization tanks at a flow rate o f approximately 28 gpm. She stated that other process wastewat er is also sent to the equalization tanks at a flow of approximately 140 gpm. Ms. Martinez described that in the equalization tanks, much of the chlorine is eaten up by microbes. From there, flow travels into vessels 1214 and 1215, Ms. Martinez explained. She noted that all of the net flow is sent to the facility’s cooling pon d and recirculated for use. Ms. Martinez then explained that Oxea Bay City Plant’ s NPDES permit requires chlorine to be measured at the Honeyhoe plant, not at Outfall 001, and read part of the per mit language, which states that chlorine be measured at the “outlet from the clarifier.” She explained tha t the chlorine measured at Honeyhoe is not dischargedNeed to return call by / at/between and . Signature: ___________________________ 

### because it is re-circulated through the cooling pond, but tha t the permit allows for effluent from Honeyhoe to be rerouted and discharged from outfall 001, if necessary. Ms. Martinez also read the permit requirements for how frequently chlorine should be measured, but this informatio n was not recorded. Ms. Martinez indicated that the State permitting authority may have not fully understood that the Oxea Bay City Plant re-circulates most of its wastewater through the cooling pond.

Table 1 – Oxea Bay City Plant’s 2008 Chlorine and Flow Data in
DMR

Monitoring Period Date DMR Loadings Tool
Chlorine
Concentration (mg/L) DMR Loadings

Tool Flow (MGD)

31-Jan-08 45 1.676

29-Feb-08 37.5 1.77

31-Mar-08 16.3 1.64
30-Apr-08 5.9 1.488
31-May-08 37.5 1.35

30-Jun-08 1.6 0.989

31-Jul-08 0.1 0.989
31-Aug-08 85 1.102
30-Sep-08 3 1.073

31-Oct-08 0.1 1.416

30-Nov-08 12 1.057

31-Dec-08 15 1.018