CBS Corporation

Date: January 19, 1999

Bloomington Project
P.O. Box 997
Bloomington, IN 47402
(812) 334 0030
(812) 334-7855 (Fax)

This progress report is to inform you of the status of the CBS groundwater investigative effort in relation to the Lemon Lane Landfill and the Illinois Central Spring, and the activities that have taken place overthe year 1998. We are making plans to further our investigation during 1999, and this report outlinessome of the steps we are considering.

Natural Potential Geophysical Survey

A natural potential survey was conducted in April. The survey consists of mapping the small directcurrent voltages at the ground surface along survey lines. The understanding is that the major producer ofthe direct current potential is flowing underground water. The largest potential differences are located along the survey lines and are, presumably, locations of higher groundwater transmission. Attached isPlate 1, Lemon Lane Landfill Natural Potential Survey Base Map, which shows the locations of those survey lines. Survey lines AA through MM transect the wooded valley in the southeast portion of the cemetery near the Illinois Central Spring. Lines NN, OO, and PP are directly south of the landfill in thewooded area in the north portion of the cemetery. Line QQ is taken immediately adjacent to the north cemetery access road, and lines RR and SS are taken immediately adjacent to access roads near thewooded valley in the south east. Parts of survey lines DD, EE, II, KK, NN, and OO were rerun in September to compare the dryer fall conditions to the wetter spring conditions. Included are the profileplots of these survey results for your convenience in Attachment 1. We are considering some additionalNP survey work in 1999, probably in dry weather, but have not yet reached the final planning stage.

Exploratory Borings

Based on the natural potential geophysical survey, CBS has drilled seventeen (17) exploratory borings between July and October of 1998. The location of these borings is also shown on Plate 1. Boring NN-300A is 5 feet to the southwest of boring NN-300. Boring II-198 and II-203 are 3 feet and 8 feetrespectively southwest of boring II-195 along the II survey line. Included in Attachment 2 are the field drill logs, and when the final decision is made on which borings will be monitoring wells, you will be sentthe final logs with construction details and surveyed elevations.

All borings, except NN-412 were drilled to at least the 795 feet amsl elevation. Boring NN-412 wasterminated at approximately the 819' elevation.

The stratigraphy encountered in the borings was that of the lower St. Louis formation. The Ethology was predominantly limestone with thin shale partings and the occasional shale interbed. The significant features encountered in all the borings were two zones of solutional development. These zones consisted of small tube-like solutional openings or conduits, developed along bedding plane partings.The upper zone, encountered from about elevation 820' to 825', is intermittent, flowing only in response to storm events. The lower zone, encountered at or about the 795' elevation, is the main water bearing zone, and appears to be perennially saturated, and under a potentiometric head. CBS is still in the process of evaluating these borings and their relationship with groundwater and contaminant flow from the landfill to Illinois Central spring, and has not yet decided which ones will be retained as monitoring, observation, or extraction wells.

PCB Sampling Results

Initial PCB sampling was conducted during or immediately after drilling the exploratory borings, except for borings II-87, II-195, and II-203 which were not sampled. The results are summarized in the table in Attachment 3, and the laboratory certificates of analysis are in Attachment 4. The table lists the boring sampled, the approximate ground surface elevation, the elevation of the steel soil casing, the zone sampled; either upper or lower, the sample ID number (which is the client ID number on the certificateof analysis), the PCB result in ppb for water or ppm for sediment, the sample material (W for water,and SE for sediment), the date and time the samples were taken. Samples LL1463 through LL1471 were taken from boring 00-387 during a pump test, which is described below. Samples LL1460-LL1462 and LL1472-LL1482 were taken at IC spring to assess the effect of the pump test there.

Pump Test Results

A pump test was conducted on October 28, 1998 to help evaluate the interconnection between the borings and to estimate aquifer parameters in the lower zone. Boring 00-387 was pumped for 4 hoursat 14.3 gallons per minute from 1200 to 1600 hours. Samples were taken from the discharge every halfhour, and those results are shown in the attached table. The discharge water was contained in polyethylene tanks, and was transported from Valhalla Cemetery to a permitted treatment facility. No discharge occurred on cemetery property. The drawdown and recovery curves from data loggers in the pumping and observation borings is in Attachment 5 for your information.

Additional Testing and Drilling

CBS considers it has successfully intercepted contaminant flow in the intermittent upper zone at borings NN-300 and NN-300A. CBS thought it had intercepted a major water and contaminant bearing conduit at 00-3 87. The initial PCB sample of the water from the lower zone at that location was 18ppb. However, during the pump test the PCBs results from that well were all less than 0.5 ppb. Also the size of the conduits that have been intercepted thus far are on the order of inches, and dyetrace and flow data at the spring indicate larger conduits probably exist.

CBS does anticipate some additional borings during 1999. The decision has not been reached yet on which locations to proceed with. As soon as this decision is made, you will be informed so that scheduling for observation personnel can be made.

CBS anticipates that due to the intermittent nature of flow in the upper zone, and the variable flow in karst terrain, that the borings will have to be sampled during storm events. CBS is planning to conduct this storm sampling this coming spring when rain showers are more frequent and predictable. Additional testing may go on later in the year.

CBS also anticipates conducting tracer tests with the injection points being upgradient locations, for example, like the North sink (900' north of the landfill). This might give information about where flow convergence could be occurring, and whether a boring had intersected a main conduit.

As these tests move out of the planning stage and get a projected start date, you will be notified so you may plan for having observers on hand.

If you have any questions about this existing information, or what CBS is proposing, please donot hesitate to call Mike McCann at (812) 334-0030.

Sincerely,
Dorothy M. Alke
Project Director