REPLY TO ATTENTION OF

Fort Crook Area

"DEPARTMENT OF THE ARMY OMAHA DISTRICT, CORPS OF ENGINEERS

FORT CROOK AREA

P.O. BOX 13287

OFFUTT AFB, NEBRASKA 68113-0287

January 7, 1992

State of New Mexico Environmental Department 525 Camino De Los Marques Santa Fe, NM 87502 (ATTN: Joe Kennedy)

Gentlemen:

Holloman AFB has utilized Rapid Response Contract DACW45-90-D-9002 for the removal of a suspected underground storage tank (UST) at Site 47 POL Washrack. Rapid Response is a new program established to assist Government agencies partaking corrective action to sites that pose an immediate health risk to the environment. This program is managed by the Corps of Engineers, Omaha District.

This project began with the excavation of two (2) preliminary pits in an attempt to locate the UST. The locations chosen for initial pit excavation were based upon recommendations from base personnel. A soil sample was taken on September 26, 1991 from the sidewall of the pit for preliminary analysis and to verify disposal options. This sample (519065/01) was analyzed for TCLP organics and inorganics. These results were received approximately one week later. All constituents were reported Non-Detect (ND). During this period of analysis, excavation continued utilizing field screening techniques (PID). The suspected UST was never found, however, an open ended pipe originating from the washrack area was uncovered and removed along with a significant amount of surrounding soils.

Another sample (519005/14) was taken from the existing sidewall on October 11, 1991 to verify previous analyses. This sample was analyzed using quick turn around time. The analytical results were reported as ND, with the exception of TCLP Benzene at 0.7ppm (regulatory level = 0.5ppm). A decision was made to c6iitinue excavating activities until field readings showed <.5ppm on PID screening. This limit was achieved on three sides. The exception was the sidewall along the fence. This area continues to be considered contaminated to some degree.

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At this point, it is our recommendation that the excavation be sampled for verification of cleanliness (total benzene via Method 8240) and backfilled. The existing washrack fence will define the limits of excavation should future remediation in this area be necessary. Attachment 1 depicts the excavated area at present, together with proposed verification sampling points. These sampling points were chosen based on field observations and will be visually refined on-site to reflect worst case samples.

All soil removed during the excavation effort was placed in piles on visqueen sheeting for temporary storage. The soils were then sampled to define disposal options. A limited number of samples were acquired and submitted for TCLP full organic and inorganic analyses. Samples were taken from each quadrant of the stockpile (i.e. NE, NW, SE, SW).

Attachment 2 shows the data obtained from that analysis. These results show no significant contamination exists in the soil. The only detectable constituent is from the SE quadrant with a slight level of chloroform (42ug/l). This concentration is well below the regulatory level of 6mg/l. The data is qualified on the data sheet for it is not 5x the quantitation limit of the instrument and method.

Due to the extensive quantity of soil (approximately 9000 cubic yards), further sampling and analyses is proposed to verify the soil is non-hazardous. Attachment 3 depicts the proposed _stage~ soil sampling locations. Grab samples will be taken from the following locations with a hollow stem soil corer at a depth corresponding to the middle or bottom half of the pile (3-5 feet). Nine field and one co-located field duplicate sample will be taken for TCLP analysis.

I hope that you find this sampling effort acceptable. In either case, a prompt reply will be greatly appreciated.

Any questions you may have regarding this subject should be directed to Mr. Larry Gann of my staff at (402)291-4260.

Sincere'~:~- A? PJ. even R. Schmidt ~

Contracting Officer's Representative

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IT ANALYTICAL IDYICD CIIIJfOI, CA

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