Field Sampling

Conduct field sampling in accordance with procedures defined in the project work plan, SAP, QAPP, and HSP.

All sampling was conducted in accordance with the procedures described in the project plans.�

Yes.

NA

Characterization of Environmental Setting (Hydrogeology)

Prepare water-level contour and/or potentiometric maps (B.3.A.1(e)(1))

Potentiometric surface map was prepared based on water levels measured in each of CSSA�s wells on September 11, 2000.� In addition, average water level for Fair Oaks MUD wells (northwest of CSSA) was also obtained.�

To the extent possible with data available.� Due to the limited data available and the fact that wells are completed across multiple water-bearing units, potentiometric maps should only be used for regional water flow direction, not local.� Furthermore, pumping in the area likely affects the natural groundwater flow direction.�

When unit-specific water level information is available, prepare water level map for each unit.� Until then, water levels in all CSSA wells should continue to be measured and all data should be mapped together due to the lack of data for any one zone.

Describe the flow system, including the vertical and horizontal components of flow (B.3.A.1(e)(3)).

Potentiometric maps were created using September 11, 2000 water level data, and horizontal flow direction was tentatively identified.� Insufficient data are currently available to determine vertical component of flow.

As described above, due to the lack of aquifer-specific water level information, potentiometric surface maps should only be used as an estimate of regional flow direction, not local.

Same as above.

Identify any temporal changes in hydraulic gradients due to seasonal influences (B.3.A.1(e)(4)).

Downloaded data from continuous-reading transducer at well 16 and continuous-reading weather station adjacent to well 16.� Graphed water levels at this well against precipitation.

Information provided by well 16 transducer-weather station is a start to identifying temporal changes.� Very rapid changes in water levels have been observed at well 16 after precipitation.� However, well 16 is completed in three units; therefore, the unit-specific effect is not known.

Install transducers in several cluster wells, after installation is complete, to determine effects of precipitation on each unit.� Wells where rapid effects are noticed, such as at wells D and MW1 (both completed in the Glen Rose only), should also be considered for transducer installation.

Contamination Characterization (Ground Water Contamination)

Characterize the horizontal and vertical extent of any immiscible or dissolved plume(s) originating from the Facility ((B.3.C.1(a))

Samples for laboratory analysis were collected from all of the CSSA wells, except wells 3 and 4, which are located adjacent to well 2; and wells G and H, which have inoperable sucker rods.� In addition, one offsite sample was collected at LS-7.

There are currently insufficient data to determine the horizontal or vertical extent of groundwater contamination.�

As described above, additional wells are currently being installed which will help in determining horizontal and vertical extent of contamination.

Determine the horizontal and vertical concentration profiles of all constituents of potential concern (COPCs) in the groundwater that are measured by EPA-approved procedures (B.3.C.1(d)).� COPCs are those chemicals that have been detected in groundwater in the past and their daughter (breakdown) products.

Groundwater samples were collected from wells 1, 2, 9, 10, 11, 16, I, MW1, MW2, and LS-7, and analyzed for the selected VOCs using EPA method SW8260B, arsenic by SW7060A, cadmium by SW7131A, lead by SW7421, mercury by SW7470A, and barium, chromium, copper, nickel, and zinc by SW6010B.� Analyses were conducted in accordance with the AFCEE QAPP and approved variances.� All reporting limits were below MCLs, as listed below:

(Analyte, RL (ug/L),  MCL (ug/L))Bromodichloromethane - 0.8 - 100

Chloroform - 0.3 - 100

Dibromochloromethane - 0.5 - 100

1,1-DCE - 1.2 - 7

cis-1,2-DCE�- 1.2 - 70

trans-1,2-DCE - 0.6 - 100

Dichloromethane - 2 -  5

PCE - 1.4 - 5

TCE - 1.0 - 5

Vinyl Chloride - 1.1 - 2

Barium - 5 - 2000

Chromium - 10 - 100

Copper - 10 - 1300

Nickel - 10 - 100

Zinc - 10 - NA

Arsenic - 1 - 50

Cadmium - 1 - 5

Lead - 5 - 15

Mercury - 1 - 2

Yes.

NA.

Contamination Characterization (Ground Water Contamination) (Continued)

Meet AFCEE QAPP quality assurance requirements.

Samples were analyzed in accordance with the AFCEE QAPP and approved variances. All data were verified by a chemist.�

Yes.

NA

All data flagged with a �U,� �J,� and �F� are usable for characterizing contamination.

Yes.

NA

The method detection limit study for cadmium was not performed within a year of the analyses, as required by the AFCEE QAPP.

The laboratory performed new MDL studies in February 2001 for this and other metals and the new MDL values were found to be almost identical to the previous MDLs and all met the associated AFCEE QAPP requirements.� MDLs for these three metals are well below MCLs.� In addition, the laboratory performed daily calibrations and RL verifications for these metals, both of which demonstrate the laboratory�s ability to detect and quantitate these metals at RL levels.� These daily analyses also indicate that concentrations above the laboratory RL for these compounds were not affected by the expired MDL study.

Use results for groundwater characterization purposes.

Noncompliant surrogate recovery in the well 9 sample and in the reanalysis of the sample.

Yes. The analytical results were over 90% complete for the entire sampling event.

NA