Long Term Pump Test Plan for Lemon Lane

Released March 13, 2002

A Goals of the test:

• To pump one or more east side ceils for an extended period of time, at least several days up to two weeks, 24 hours per day. This is being done to evaluate the hydraulic impact at the site and the spring.
• To pump the well at a rate such that a noticeable impact on flow at IC Spring will occur. This is thought to be at least a rate of 10~15 gpm.
• To determine the impact of long term pumping under non-storm conditions on PCB levels at IC Spring.
• To determine the PCB concentranons over time at the pumping well.
• To ramp up the water withdrawal rate up to near SO gpm during a stonm event and determine the impact on basin storm hydraulics and PCB levels at the IC Spring.
• To determine the impact on basin hydraulics of releasmg a large amount of water into Sargent's Pond during non-storm conditions.

B. Prerequisites

1. Confirm that the new PSARA treatment trailer can process up to 5O gpm continually and produce water that meets the discharge standard. Conduct a short pump test from MW21 to contirm this.
2. Have a backup water treatment system available. This trailer should be capable of conunually treating about 20 gpm.
3. Determine if MW 21 wi11 produce water with a high level of PCB contammation.
4. Reconfimn the low flow water level potentiometric surface. Determme which of the 41 area wells has the lowest non-storm water level.
5. Plug the low flow outlets of the lined retention pond at the southwest corner of the landfill. Set up a temporary pumping system at the retention basin that could pump from the basin to the storm culvert at the intersection of Vernal Pike, Knuckles Road, and SR 37.
6. Flows at IC Spring should be less than 100 gpm. With no rain predicted for the first few days of the test period.
7. Ensure that the well pumpmg and treatment systems can reliably maintain a pump rate within 2 gpm of the initial pumping rate.
8. Arrange for continuous water treatment capacity trom 15 to 50 gpm. Well water should be collected in a treatment system collection tank. The treatment system should be set up to pump water from the tank.
9. Place pumps MW 21, 20, and 4I. Each pump should have a capacity of about 10-15 gpm or more.
10. Set up an ISCO auto sampler at IC Spring.
11. Ensure that IDEM is prepared to take sump fill records of water level input to the water treatment plant. Ensure the conductivity probe at the treatment plant is in good workmg condition. If not have the lab measure the conductivity of all samples submitted.
12. Place water level recorders In the followmg wells and set the time interval to hourly: MW6, 17, SP1, and MW15.
13. Ensure the capability exist to sample the Iindividual pump discharge from each pumping well.
14. Ensure the water level instrument and data logger in Sargent's Pond are in good working order.

C. Detailed procedure

• Turn on the auto-sampler at IC spring 2 hours prior to turning on the pump at the well. Begin with hourly sampling materials at the spring.
• Begin pumping from Well MW21 at about 10-15 gpm. Discharge the water to a holdmg tank. Pump water trom the holding tank to the treatment system. Discharge mater from the treatment system to the lined ditch system at the landfill. The water discharged from the treatment system should be sampled every 8 hours for the first ten days. The sampling frequency wi11 be changed to daily after confirmation of the systems ability to consistently produce effluent that meets the standard. Samples from between the two carbon vessels will also be taken to determine if and when breakthrough occurs on the lead carbon vessel.