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2007 18:24:12 -0400 X_MIMEOLE: Produced By Microsoft Exchange V6.0.6603.0 MIME_Version: 1.0 Subject: RE: Sampling at GCC Property
PostedDate: 08/16/2007 05:24:12 PM$MessageID: <4A9B937431EF314390B59A5D38DD9DF202B9970B@trcmail5.trc_windsor.trcsolutions.com> X_MS_Has_Attach: X_MS_TNEF_Correlator: Thread_Topic: Sampling at GCC Property Thread_Index: AcfgIG9y7dMkXY5/TDaURgIgAjm9wwAMXMiQ From: "Ahmed, Riaz \(Houston,TX-US\)" <RAhmed@TRCSOLUTIONS.com> SendTo: Katrina Coltrain/R6/USEPA/US@EPA CopyTo: <allan.pasteris@state.nm.us>,"Clark, David C \(Topeka\)" <David.Clark@bnsf.com>,<David.Mayerson@state.nm.us> X_OriginalArrivalTime: 16 Aug 2007 22:24:12.0372 (UTC) FILETIME=[2C049140:01C7E054] X_PMX_Version: 5.3.3.310218, Antispam-Engine: 2.5.2.311128, Antispam-Data:

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We will attempt to take three surface soil samples at the CS-G10-1, CS-G10-2 and CS-G10-3 Monday afternoon or early Tuesday and ship it for analysis for zinc. Subsequent excavation and sampling will be done after upper sands investigation is complete.

-----Original Message----- From: Coltrain.Katrina@epamail.epa.gov [mailto:Coltrain.Katrina@epamail.epa.gov] Sent: Thursday, August 16, 2007 11:12 AM To: Ahmed, Riaz (Houston,TX-US) Cc: allan.pasteris@state.nm.us; Clark, David C (Topeka); David.Mayerson@state.nm.us Subject: RE: Sampling at GCC Property

Riaz, according to number 2 the SB sampling will be completed and then following the upper investigation, the soils will be excavated. For clarification, additional soil samples will be taken next week, August
20 and 21. Is this correct?

Katrina Higgins-Coltrain Remedial Project Manager USEPA Superfund Louisiana/New Mexico/Oklahoma Team (6SF-RL) 1445 Ross Avenue, Suite 1200 Dallas, TX 75202

214-665-8143 214-665-6660 (fax)

"Ahmed, Riaz \(Houston,TX-US\
)" To <RAhmed@TRCSOLUT Katrina Coltrain/R6/USEPA/US@EPA

IONS.com> cc <allan.pasteris@state.nm.us>, 08/15/2007 05:56 "Clark, David C \(Topeka\)" PM <David.Clark@bnsf.com>, <David.Mayerson@state.nm.us> Subject RE: Sampling at GCC PropertyI tried to take a short cut. I apologize. However, here are the answers.

1. Identified locations are correct. TRC resampling of SB designated samples were next to the original locations. In the final report we will
add these locations and note values of SRGs. 2. All soils excavated during this operation will be staged on the southern portion of the site which is fenced. The excavated soil will be eventually stabilized and managed in the wastewater reservoir in a manner similar to other soils which may excavated within the fenced portion of the site during remedial action. 3. This activity will not impact the upper sands investigation. We expect to complete the initial sampling upfront and initiate the excavation subsequent to completion of the upper sand investigation field work. The entire GCC activity report will be completed and submitted to agencies six weeks after achieving removal of contaminated soil in these three locations. The time to achieve satisfactory removal of impacted soil will depend upon the number of sampling /excavation iterations needed. Initially we will excavate the surrounding areas that are visually or olfactory impacted. However, this will not work for areas impacted by zinc. 4. Our task one is to sample CS-G10-1, CS-G10-2 and CS-G10-3 individually at the 0 to 6 inch depth. This is the depth at which these samples were taken for verification purposes. The objective of this sampling effort will be to identify samples that caused the composite to exceed the zinc SRG. Once it is determined, then location(s) exceeding SRG will be subjected to excavation. 5. A PID will be on site for purposes of monitoring exposure. 6. A GPS unit will be available to document sampling locations and to identify boundaries of excavation. 7. The final report will have all procedures, methods, results documented. Legal description will be imported from sales document.

I trust you will find the above to satisfactory responses to your comments. Please call me if you have questions. My number is 713-249-8547. Thanks for quick review.

Riaz

-----Original Message----- From: Coltrain.Katrina@epamail.epa.gov [mailto:Coltrain.Katrina@epamail.epa.gov] Sent: Tuesday, August 14, 2007 3:45 PM To: Ahmed, Riaz (Houston,TX-US) Cc: allan.pasteris@state.nm.us; Clark, David C (Topeka); David.Mayerson@state.nm.us; Ahmed, Riaz (Houston,TX-US) Subject: Re: Sampling at GCC Property

Dave/Riaz, NMED/EPA have reviewed the proposed plan of action for the removal of soil exceeding the soil remediation goals and have the following requests and comments.

1. Attached is a markup of the map which Riaz sent. Please verify that the identified locations are correct. In the future, please provide figures showing locations of interest. In addition, this figure does not show the confirmation samples taken in May 2007 around areas represented by SB-44, SB-47, SB-45, SB48, and SB-54. Please includethese sample locations and include the SRG values for Zinc (200mg/kg) and BAP (7.8 mg/kg).

2. Please indicate that the soils will be staged on the southern portion of the site property and will be stabilized and disposed in the WWR area during remedial action.

3. Please provide a proposed schedule of activity as well as an assurance that this will not delay or affect the upper intermediate aquifer characterization activity. Please include field schedule and report submittal schedule.

4. Sampling of the CS-10 locations will be grab or composite? Will be taken at what depth?

5. What is 'HNU type instrument'?

6. During excavation please make efforts to GPS sample locations and extent of soil removal (horizontal and lateral) so that these activities can be documented in the final report and shown accurately on maps.

7. For future reference, please provide the actual acreage, legal description, and land parcel map for GCC. My understanding is that this is a 16 acre parcel rather than a 20 acre parcel.

(See attached file: 20070810125941annotated.pdf)

Katrina Higgins-Coltrain Remedial Project Manager USEPA Superfund Louisiana/New Mexico/Oklahoma Team (6SF-RL) 1445 Ross Avenue, Suite 1200 Dallas, TX 75202

214-665-8143 214-665-6660 (fax)

"Ahmed, Riaz \(Houston,TX-US\
)" To <RAhmed@TRCSOLUT Katrina Coltrain/R6/USEPA/US@EPA, IONS.com> <David.Mayerson@state.nm.us>, <allan.pasteris@state.nm.us>, 08/10/2007 03:13 "Clark, David C \(Topeka\)"

PM <David.Clark@bnsf.com>

cc "Ahmed, Riaz \(Houston,TX-US\)"

<RAhmed@TRCSOLUTIONS.com> Subject Sampling at GCC PropertyHere is the proposed plan of action to remove additional impacted soils from GCC area. If you all agree with the proposed plan, we would like to accomplish first task ASAP, even before we mobilize on August 20.

BNSF is in the process of selling a 20 acre L shaped parcel north of the fence to GCC Premium Transloaders (GCC). At locations, GCC observed several north-south linear surface expression of asphaltic like material. GCC requested that BNSF remove this material. The removal of this material was completed soon after. During this removal process , BNSF noted that certain areas seemed impacted based on visual and odor observations. The impacted soil was also removed at the same time. Upon removal of all material, 10 composite sample were taken to verify that the bottom of the excavation met soil remediation goals(SRG). The attached figure shows areas of excavation and composite samples taken for verification purposes. Verification sampling showed three samples to exceed SRG. They are CS-G04 with Zinc at 372mg/kg, CS-G06 with BAP at 26.8 and CS-G10 with zinc at 215. As evident from the attached figure, CS-G04 and CS-G06 are not composite samples. CS-G10 is a composite of three samples.

First task will be to sample CS-G10-1, CS-G10-2, and CS-G10-3 for zinc and identify location(s) that have zinc above 200 mg/kg.

Second task will be to step out 10 feet ( can be adjusted in field based on visual or odor observations) in all four direction . Excavate the entire area i.e. 20 ft by 20 ft to a depth of three feet. A soil sample will be taken at the center of each wall and analyzed for BAP in case of CS-G06 and zinc for others. Step out will be continued till we obtain data that shows soil samples to be blow SRG.

Since these areas have already been excavated to a certain extent, the following procedure will be used to determine the depth of excavation:1-
Around each excavation at least three elevation measurements will made on undisturbed land.2- The average of the three measurements will be
used as reference elevation for that location.3- Reference elevation minus three feet will be used as the target elevation of excavation at that particular location.

All work will be done as per Site Health and Safety plan and a HNU type
instrument will be available at the site. [attachment "20070810125941.pdf" deleted by KatrinaColtrain/R6/USEPA/US]