Superu SITE 1 BREAt 6 euro OTHLk 25T4041

EBASCO SDMS DocID 254047

October 28 1994 ARCS I 94-335 No Response Required

Ms Pamela Shields Remedial Project Manager US Environmental Protection Agency 90 Canal Street (HPS-CAN2) Boston MA 02114

SUBJECT ARCS I - EPA CONTRACT NO 68-W9-0034 WORK ASSIGNMENT NO 022-1L15 NYANZA OPERABLE UNIT 2 PREDESIGN STUDY SUMMARY REPORT ON DNAPL PUMPING (EXTRACTION WELL RW-1)

Dear Ms Shields

The enclosed field activity report summarizes the DNAPL pumping that the ARCS I team performed prior to conducting the step test The initial recommendation by the ARCS I team is for separate phase pumping of DNAPL in conjunction with the hydraulic pumping from the screen area This configuration will simulate the conceptual design of the treatment plant We also recommend continued pumping of the DNAPL from recovery well RW-1 to promote continued cleanup of the aquifer

If you have any questions regarding the DNAPL test results please contact me at (617) 457-8200

Sincerel

Boyd Allen Til C Project Manager

SJLBAgb Attachments cc A Klinger

A Fowler (c1 only) K Hunt (c1 only) R Leighton (c1 only)

FILE NYAN 22 7il NYAN 22 75 (c1 only) ARCS PM 11

EBASCO ENVIRONMENTAL A Division ofEbasco Services Incorporated

470 ATLANTIC AVENUE bull 3RD FLOOR bull BOSTON MA 02210 (617) 457-8200 bull FAX (617) 457-8498 8499

9432ARCS I October 28 1994 Page 2

h c s Leach bC J Holwell

Superfund Records Center SITE H BREAK OTHER

Summary Report On DNAPL Pumping Nyanza Superfund Site

Ashland MA

Introduction

As part of the remedial design at the Nyanza Superfund site a pumping test will be performed to quantify hydraulic properties of the aquifer and to pilot test a treatment system During the development of pumping well RW-1 dense nonaqueous phase liquid (DNAPL) was recovered in the bottom of the well The DNAPL product has the potential to interfere with the pump utilized in the pumping test and therefore Ebasco suggested separate pumping of the DNAPL phase prior to the test to determine if the DNAPL was recoverable as a separate phase product and if this recovery would be sustainable with continued pumping

Ebasco was tasked under Revision 12 of the current Work Plan to pump the DNAPL for several days If product recovery was eliminated then the pumping test would proceed as planned If product continued to be recovered in the well Ebasco and the EPA would evaluate the next steps for the project This report summarizes the DNAPL pumping activities and other observations from additional pumping for optimization testing

Equipment Used

Two different pumping systems were tested to compare effectiveness in recovering DNAPL The first system was comprised of an ORS Environmental Equipment Well Probe Scavenger that is designed to pump product The second system was a Grundfos Redi-Flow 05 hp submersible pump controlled by an on-off current sensing relay An Advanced Remediation Technology paddle wheel flow meter was installed in the discharge line to measure the flow rate and volume of fluid pumped from RW-1

The DNAPL layer thickness was measured using an Advanced Remediation Technology probe DNAPL thickness was measured in RW-1 (6-inch id pumping well) MW-113A (2-inch id monitoring well 25 feet west of RW-1) and P-1B (2-inch id diameter piezometer 50 feet east of RW-1) prior to the start of the test at least every two hours during the test and at the conclusion of the test Note that product thickness could not be gaged when the Grundfos pump was in RW-1 due to the constricted access presented by the controller cables and pump lines

Pumping Results

Product pumping for testing purposes took place from August 29 to 31 1994 Pumping logs for the test period are appended to this

report Product thickness was initially gaged in RW-1 at 19 feet and in MW-113A at 215 feet (representing 279 and 034 gallons respectively) no product was detected in P-1B The ORS product pump was deployed and pumping initiated at 4 gallons per minute (gpm) on August 29 1994 The pump sensor shut off the pump after several minutes of pumping as there was not enough product available at the intake There was no measured product recharge over the next three hours The pump intake was modified to pump product down to a thickness of 003 inches Pumping was completed in two minutes and no product recharge was measured during the next two hours The pump was secured and DNAPL thickness gaged in the three wells No product was gaged in either RW-1 or P-1B and no change in thickness was gaged in MW-113A

The three wells were gaged on the morning of August 30 1994 and there was no difference in product levels from the previous evening The ORS pump was deployed and the product sensor disengaged Pumping started at a 35 gpm rate with the pump set for total fluids recovery The pumping rate decreased gradually to 25 gpm as the water column in the pumping well was lowered by 93 feet A sample of the pumped water showed a cloudy emulsion with approximately one ounce of black oily product in twelve ounces of water The water consistency remained the same over the duration of pumping (9 hours) DNAPL thicknesses at the end of the day were the same as the morning thicknesses

The wells were gaged on the morning of August 31 1994 and there was no difference in the product thicknesses from the end of the previous day No product was gaged in wells RW-1 and P-1B product was gaged in MW-113A at 215 feet The Grundfos pump was deployed in an effort to draw more product into the well The pump was started at 6 gpm and a jar sample indicated a product and water emulsion being pumped The pump was shut off after three hours removed from the well and a bailer lowered to measure product The bailer showed a product thickness of seven inches The Grundfos pump was lowered again into the well but failed to restart because of swollen seals The pump was disassembled rebuilt and then restarted After pumping another three hours the pump was raised off the bottom allowing only water to flush through system The pump was turned off and a restart attempted the pump locked up again DNAPL thicknesses were gaged at the end of the day and found to be the same as the morning thicknesses in MW-113A and Pshy1B A product thickness of 040 feet was gaged in RW-1 A bailer was lowered and the sample showed approximately 075 inches of product indicating potential discrepancies between the probe readings and the actual DNAPL thicknesses gaged by the probe

Additional Pumping Observations

Because the step test was going to be conducted at a lower flow than originally anticipated in the Work Plan additional water was

required for optimization testing of the pilot treatment system The additional pumping was initiated on September 1 1994 DNAPL thickness was gaged in the three wells in the morning Thickness in RW-1 had increased by approximately 01 feet to a 05 feet during the night and MW-113A showed the same 215 foot thickness No product was gaged in P-1B The ORS pump was deployed to remove the accumulated product The pump failed to start and disassembly of the pump revealed worn pump gears The Grundfos pump was then disassembled cleaned with Alconox and water was pumped from RW-1 to the storage tank At the end of the day the flow meter was observed to be stuck but water was still flowing The flow meter was replaced Optimization water was pumped on the following day September 2 1994 but no wells were gaged for product

The step test was conducted on Friday September 9 1994 RW-1 was gaged the following morning (September 10 1994) for hydraulic recovery purposes and 07 feet of product measured in the well More water for optimization of the pilot treatment system was pumped from September 12 to 14 1994 On September 12 1994 approximately 150 gallons of product and emulsion were pumped RWshy1 was gaged in the afternoon and a product thickness of 439 feet was measured This was the largest measured thickness during the entire program The DNAPL pump was deployed in the morning of September 13 1994 and a little under 8 gallons of product were removed before the pump sanded up Additional water was pumped by the Grundfos pump for optimization water Product thickness was not gaged the following morning but the flow meter was found to be clogged by sand The flow meter was repaired and the Grundfos pump used to pump optimization water

Conclusions

The above testing shows that DNAPL does recharge pumping well RW-1 When only product is pumped using an electric product pump like the ORS Scavenger pump DNAPL recharge is very slow and the environment potentially hostile to pump components Product pumping is completed in minutes and a recharge period of five to ten hours was required before another pumping cycle was initiated Utilization of a low flow pneumatic bladder pump with a flow rate in tenths of a gpm may be more successful in terms of maintaining a steady and sustainable product flow However it should be noted that the cyclic pumping did not lose the trap and that DNAPL continued to recharge the well under that pumping regimen

When the Grundfos submersible pump was utilized a DNAPL emulsion was pumped well drawdown and local hydraulic gradients increased and consequently DNAPL recharge to the well increased The additional pumping for optimization water provided a simulation of the constant rate test conditions and resulted in product intake at the pump The product proved hostile to the pump seals and caused the pump to lock up once it stopped pumping Flushing the pump

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

9432ARCS I October 28 1994 Page 2

h c s Leach bC J Holwell

Superfund Records Center SITE H BREAK OTHER

Summary Report On DNAPL Pumping Nyanza Superfund Site

Ashland MA

Introduction

As part of the remedial design at the Nyanza Superfund site a pumping test will be performed to quantify hydraulic properties of the aquifer and to pilot test a treatment system During the development of pumping well RW-1 dense nonaqueous phase liquid (DNAPL) was recovered in the bottom of the well The DNAPL product has the potential to interfere with the pump utilized in the pumping test and therefore Ebasco suggested separate pumping of the DNAPL phase prior to the test to determine if the DNAPL was recoverable as a separate phase product and if this recovery would be sustainable with continued pumping

Ebasco was tasked under Revision 12 of the current Work Plan to pump the DNAPL for several days If product recovery was eliminated then the pumping test would proceed as planned If product continued to be recovered in the well Ebasco and the EPA would evaluate the next steps for the project This report summarizes the DNAPL pumping activities and other observations from additional pumping for optimization testing

Equipment Used

Two different pumping systems were tested to compare effectiveness in recovering DNAPL The first system was comprised of an ORS Environmental Equipment Well Probe Scavenger that is designed to pump product The second system was a Grundfos Redi-Flow 05 hp submersible pump controlled by an on-off current sensing relay An Advanced Remediation Technology paddle wheel flow meter was installed in the discharge line to measure the flow rate and volume of fluid pumped from RW-1

The DNAPL layer thickness was measured using an Advanced Remediation Technology probe DNAPL thickness was measured in RW-1 (6-inch id pumping well) MW-113A (2-inch id monitoring well 25 feet west of RW-1) and P-1B (2-inch id diameter piezometer 50 feet east of RW-1) prior to the start of the test at least every two hours during the test and at the conclusion of the test Note that product thickness could not be gaged when the Grundfos pump was in RW-1 due to the constricted access presented by the controller cables and pump lines

Pumping Results

Product pumping for testing purposes took place from August 29 to 31 1994 Pumping logs for the test period are appended to this

report Product thickness was initially gaged in RW-1 at 19 feet and in MW-113A at 215 feet (representing 279 and 034 gallons respectively) no product was detected in P-1B The ORS product pump was deployed and pumping initiated at 4 gallons per minute (gpm) on August 29 1994 The pump sensor shut off the pump after several minutes of pumping as there was not enough product available at the intake There was no measured product recharge over the next three hours The pump intake was modified to pump product down to a thickness of 003 inches Pumping was completed in two minutes and no product recharge was measured during the next two hours The pump was secured and DNAPL thickness gaged in the three wells No product was gaged in either RW-1 or P-1B and no change in thickness was gaged in MW-113A

The three wells were gaged on the morning of August 30 1994 and there was no difference in product levels from the previous evening The ORS pump was deployed and the product sensor disengaged Pumping started at a 35 gpm rate with the pump set for total fluids recovery The pumping rate decreased gradually to 25 gpm as the water column in the pumping well was lowered by 93 feet A sample of the pumped water showed a cloudy emulsion with approximately one ounce of black oily product in twelve ounces of water The water consistency remained the same over the duration of pumping (9 hours) DNAPL thicknesses at the end of the day were the same as the morning thicknesses

The wells were gaged on the morning of August 31 1994 and there was no difference in the product thicknesses from the end of the previous day No product was gaged in wells RW-1 and P-1B product was gaged in MW-113A at 215 feet The Grundfos pump was deployed in an effort to draw more product into the well The pump was started at 6 gpm and a jar sample indicated a product and water emulsion being pumped The pump was shut off after three hours removed from the well and a bailer lowered to measure product The bailer showed a product thickness of seven inches The Grundfos pump was lowered again into the well but failed to restart because of swollen seals The pump was disassembled rebuilt and then restarted After pumping another three hours the pump was raised off the bottom allowing only water to flush through system The pump was turned off and a restart attempted the pump locked up again DNAPL thicknesses were gaged at the end of the day and found to be the same as the morning thicknesses in MW-113A and Pshy1B A product thickness of 040 feet was gaged in RW-1 A bailer was lowered and the sample showed approximately 075 inches of product indicating potential discrepancies between the probe readings and the actual DNAPL thicknesses gaged by the probe

Additional Pumping Observations

Because the step test was going to be conducted at a lower flow than originally anticipated in the Work Plan additional water was

required for optimization testing of the pilot treatment system The additional pumping was initiated on September 1 1994 DNAPL thickness was gaged in the three wells in the morning Thickness in RW-1 had increased by approximately 01 feet to a 05 feet during the night and MW-113A showed the same 215 foot thickness No product was gaged in P-1B The ORS pump was deployed to remove the accumulated product The pump failed to start and disassembly of the pump revealed worn pump gears The Grundfos pump was then disassembled cleaned with Alconox and water was pumped from RW-1 to the storage tank At the end of the day the flow meter was observed to be stuck but water was still flowing The flow meter was replaced Optimization water was pumped on the following day September 2 1994 but no wells were gaged for product

The step test was conducted on Friday September 9 1994 RW-1 was gaged the following morning (September 10 1994) for hydraulic recovery purposes and 07 feet of product measured in the well More water for optimization of the pilot treatment system was pumped from September 12 to 14 1994 On September 12 1994 approximately 150 gallons of product and emulsion were pumped RWshy1 was gaged in the afternoon and a product thickness of 439 feet was measured This was the largest measured thickness during the entire program The DNAPL pump was deployed in the morning of September 13 1994 and a little under 8 gallons of product were removed before the pump sanded up Additional water was pumped by the Grundfos pump for optimization water Product thickness was not gaged the following morning but the flow meter was found to be clogged by sand The flow meter was repaired and the Grundfos pump used to pump optimization water

Conclusions

The above testing shows that DNAPL does recharge pumping well RW-1 When only product is pumped using an electric product pump like the ORS Scavenger pump DNAPL recharge is very slow and the environment potentially hostile to pump components Product pumping is completed in minutes and a recharge period of five to ten hours was required before another pumping cycle was initiated Utilization of a low flow pneumatic bladder pump with a flow rate in tenths of a gpm may be more successful in terms of maintaining a steady and sustainable product flow However it should be noted that the cyclic pumping did not lose the trap and that DNAPL continued to recharge the well under that pumping regimen

When the Grundfos submersible pump was utilized a DNAPL emulsion was pumped well drawdown and local hydraulic gradients increased and consequently DNAPL recharge to the well increased The additional pumping for optimization water provided a simulation of the constant rate test conditions and resulted in product intake at the pump The product proved hostile to the pump seals and caused the pump to lock up once it stopped pumping Flushing the pump

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

Superfund Records Center SITE H BREAK OTHER

Summary Report On DNAPL Pumping Nyanza Superfund Site

Ashland MA

Introduction

As part of the remedial design at the Nyanza Superfund site a pumping test will be performed to quantify hydraulic properties of the aquifer and to pilot test a treatment system During the development of pumping well RW-1 dense nonaqueous phase liquid (DNAPL) was recovered in the bottom of the well The DNAPL product has the potential to interfere with the pump utilized in the pumping test and therefore Ebasco suggested separate pumping of the DNAPL phase prior to the test to determine if the DNAPL was recoverable as a separate phase product and if this recovery would be sustainable with continued pumping

Ebasco was tasked under Revision 12 of the current Work Plan to pump the DNAPL for several days If product recovery was eliminated then the pumping test would proceed as planned If product continued to be recovered in the well Ebasco and the EPA would evaluate the next steps for the project This report summarizes the DNAPL pumping activities and other observations from additional pumping for optimization testing

Equipment Used

Two different pumping systems were tested to compare effectiveness in recovering DNAPL The first system was comprised of an ORS Environmental Equipment Well Probe Scavenger that is designed to pump product The second system was a Grundfos Redi-Flow 05 hp submersible pump controlled by an on-off current sensing relay An Advanced Remediation Technology paddle wheel flow meter was installed in the discharge line to measure the flow rate and volume of fluid pumped from RW-1

The DNAPL layer thickness was measured using an Advanced Remediation Technology probe DNAPL thickness was measured in RW-1 (6-inch id pumping well) MW-113A (2-inch id monitoring well 25 feet west of RW-1) and P-1B (2-inch id diameter piezometer 50 feet east of RW-1) prior to the start of the test at least every two hours during the test and at the conclusion of the test Note that product thickness could not be gaged when the Grundfos pump was in RW-1 due to the constricted access presented by the controller cables and pump lines

Pumping Results

Product pumping for testing purposes took place from August 29 to 31 1994 Pumping logs for the test period are appended to this

report Product thickness was initially gaged in RW-1 at 19 feet and in MW-113A at 215 feet (representing 279 and 034 gallons respectively) no product was detected in P-1B The ORS product pump was deployed and pumping initiated at 4 gallons per minute (gpm) on August 29 1994 The pump sensor shut off the pump after several minutes of pumping as there was not enough product available at the intake There was no measured product recharge over the next three hours The pump intake was modified to pump product down to a thickness of 003 inches Pumping was completed in two minutes and no product recharge was measured during the next two hours The pump was secured and DNAPL thickness gaged in the three wells No product was gaged in either RW-1 or P-1B and no change in thickness was gaged in MW-113A

The three wells were gaged on the morning of August 30 1994 and there was no difference in product levels from the previous evening The ORS pump was deployed and the product sensor disengaged Pumping started at a 35 gpm rate with the pump set for total fluids recovery The pumping rate decreased gradually to 25 gpm as the water column in the pumping well was lowered by 93 feet A sample of the pumped water showed a cloudy emulsion with approximately one ounce of black oily product in twelve ounces of water The water consistency remained the same over the duration of pumping (9 hours) DNAPL thicknesses at the end of the day were the same as the morning thicknesses

The wells were gaged on the morning of August 31 1994 and there was no difference in the product thicknesses from the end of the previous day No product was gaged in wells RW-1 and P-1B product was gaged in MW-113A at 215 feet The Grundfos pump was deployed in an effort to draw more product into the well The pump was started at 6 gpm and a jar sample indicated a product and water emulsion being pumped The pump was shut off after three hours removed from the well and a bailer lowered to measure product The bailer showed a product thickness of seven inches The Grundfos pump was lowered again into the well but failed to restart because of swollen seals The pump was disassembled rebuilt and then restarted After pumping another three hours the pump was raised off the bottom allowing only water to flush through system The pump was turned off and a restart attempted the pump locked up again DNAPL thicknesses were gaged at the end of the day and found to be the same as the morning thicknesses in MW-113A and Pshy1B A product thickness of 040 feet was gaged in RW-1 A bailer was lowered and the sample showed approximately 075 inches of product indicating potential discrepancies between the probe readings and the actual DNAPL thicknesses gaged by the probe

Additional Pumping Observations

Because the step test was going to be conducted at a lower flow than originally anticipated in the Work Plan additional water was

required for optimization testing of the pilot treatment system The additional pumping was initiated on September 1 1994 DNAPL thickness was gaged in the three wells in the morning Thickness in RW-1 had increased by approximately 01 feet to a 05 feet during the night and MW-113A showed the same 215 foot thickness No product was gaged in P-1B The ORS pump was deployed to remove the accumulated product The pump failed to start and disassembly of the pump revealed worn pump gears The Grundfos pump was then disassembled cleaned with Alconox and water was pumped from RW-1 to the storage tank At the end of the day the flow meter was observed to be stuck but water was still flowing The flow meter was replaced Optimization water was pumped on the following day September 2 1994 but no wells were gaged for product

The step test was conducted on Friday September 9 1994 RW-1 was gaged the following morning (September 10 1994) for hydraulic recovery purposes and 07 feet of product measured in the well More water for optimization of the pilot treatment system was pumped from September 12 to 14 1994 On September 12 1994 approximately 150 gallons of product and emulsion were pumped RWshy1 was gaged in the afternoon and a product thickness of 439 feet was measured This was the largest measured thickness during the entire program The DNAPL pump was deployed in the morning of September 13 1994 and a little under 8 gallons of product were removed before the pump sanded up Additional water was pumped by the Grundfos pump for optimization water Product thickness was not gaged the following morning but the flow meter was found to be clogged by sand The flow meter was repaired and the Grundfos pump used to pump optimization water

Conclusions

The above testing shows that DNAPL does recharge pumping well RW-1 When only product is pumped using an electric product pump like the ORS Scavenger pump DNAPL recharge is very slow and the environment potentially hostile to pump components Product pumping is completed in minutes and a recharge period of five to ten hours was required before another pumping cycle was initiated Utilization of a low flow pneumatic bladder pump with a flow rate in tenths of a gpm may be more successful in terms of maintaining a steady and sustainable product flow However it should be noted that the cyclic pumping did not lose the trap and that DNAPL continued to recharge the well under that pumping regimen

When the Grundfos submersible pump was utilized a DNAPL emulsion was pumped well drawdown and local hydraulic gradients increased and consequently DNAPL recharge to the well increased The additional pumping for optimization water provided a simulation of the constant rate test conditions and resulted in product intake at the pump The product proved hostile to the pump seals and caused the pump to lock up once it stopped pumping Flushing the pump

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

report Product thickness was initially gaged in RW-1 at 19 feet and in MW-113A at 215 feet (representing 279 and 034 gallons respectively) no product was detected in P-1B The ORS product pump was deployed and pumping initiated at 4 gallons per minute (gpm) on August 29 1994 The pump sensor shut off the pump after several minutes of pumping as there was not enough product available at the intake There was no measured product recharge over the next three hours The pump intake was modified to pump product down to a thickness of 003 inches Pumping was completed in two minutes and no product recharge was measured during the next two hours The pump was secured and DNAPL thickness gaged in the three wells No product was gaged in either RW-1 or P-1B and no change in thickness was gaged in MW-113A

The three wells were gaged on the morning of August 30 1994 and there was no difference in product levels from the previous evening The ORS pump was deployed and the product sensor disengaged Pumping started at a 35 gpm rate with the pump set for total fluids recovery The pumping rate decreased gradually to 25 gpm as the water column in the pumping well was lowered by 93 feet A sample of the pumped water showed a cloudy emulsion with approximately one ounce of black oily product in twelve ounces of water The water consistency remained the same over the duration of pumping (9 hours) DNAPL thicknesses at the end of the day were the same as the morning thicknesses

The wells were gaged on the morning of August 31 1994 and there was no difference in the product thicknesses from the end of the previous day No product was gaged in wells RW-1 and P-1B product was gaged in MW-113A at 215 feet The Grundfos pump was deployed in an effort to draw more product into the well The pump was started at 6 gpm and a jar sample indicated a product and water emulsion being pumped The pump was shut off after three hours removed from the well and a bailer lowered to measure product The bailer showed a product thickness of seven inches The Grundfos pump was lowered again into the well but failed to restart because of swollen seals The pump was disassembled rebuilt and then restarted After pumping another three hours the pump was raised off the bottom allowing only water to flush through system The pump was turned off and a restart attempted the pump locked up again DNAPL thicknesses were gaged at the end of the day and found to be the same as the morning thicknesses in MW-113A and Pshy1B A product thickness of 040 feet was gaged in RW-1 A bailer was lowered and the sample showed approximately 075 inches of product indicating potential discrepancies between the probe readings and the actual DNAPL thicknesses gaged by the probe

Additional Pumping Observations

Because the step test was going to be conducted at a lower flow than originally anticipated in the Work Plan additional water was

required for optimization testing of the pilot treatment system The additional pumping was initiated on September 1 1994 DNAPL thickness was gaged in the three wells in the morning Thickness in RW-1 had increased by approximately 01 feet to a 05 feet during the night and MW-113A showed the same 215 foot thickness No product was gaged in P-1B The ORS pump was deployed to remove the accumulated product The pump failed to start and disassembly of the pump revealed worn pump gears The Grundfos pump was then disassembled cleaned with Alconox and water was pumped from RW-1 to the storage tank At the end of the day the flow meter was observed to be stuck but water was still flowing The flow meter was replaced Optimization water was pumped on the following day September 2 1994 but no wells were gaged for product

The step test was conducted on Friday September 9 1994 RW-1 was gaged the following morning (September 10 1994) for hydraulic recovery purposes and 07 feet of product measured in the well More water for optimization of the pilot treatment system was pumped from September 12 to 14 1994 On September 12 1994 approximately 150 gallons of product and emulsion were pumped RWshy1 was gaged in the afternoon and a product thickness of 439 feet was measured This was the largest measured thickness during the entire program The DNAPL pump was deployed in the morning of September 13 1994 and a little under 8 gallons of product were removed before the pump sanded up Additional water was pumped by the Grundfos pump for optimization water Product thickness was not gaged the following morning but the flow meter was found to be clogged by sand The flow meter was repaired and the Grundfos pump used to pump optimization water

Conclusions

The above testing shows that DNAPL does recharge pumping well RW-1 When only product is pumped using an electric product pump like the ORS Scavenger pump DNAPL recharge is very slow and the environment potentially hostile to pump components Product pumping is completed in minutes and a recharge period of five to ten hours was required before another pumping cycle was initiated Utilization of a low flow pneumatic bladder pump with a flow rate in tenths of a gpm may be more successful in terms of maintaining a steady and sustainable product flow However it should be noted that the cyclic pumping did not lose the trap and that DNAPL continued to recharge the well under that pumping regimen

When the Grundfos submersible pump was utilized a DNAPL emulsion was pumped well drawdown and local hydraulic gradients increased and consequently DNAPL recharge to the well increased The additional pumping for optimization water provided a simulation of the constant rate test conditions and resulted in product intake at the pump The product proved hostile to the pump seals and caused the pump to lock up once it stopped pumping Flushing the pump

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

required for optimization testing of the pilot treatment system The additional pumping was initiated on September 1 1994 DNAPL thickness was gaged in the three wells in the morning Thickness in RW-1 had increased by approximately 01 feet to a 05 feet during the night and MW-113A showed the same 215 foot thickness No product was gaged in P-1B The ORS pump was deployed to remove the accumulated product The pump failed to start and disassembly of the pump revealed worn pump gears The Grundfos pump was then disassembled cleaned with Alconox and water was pumped from RW-1 to the storage tank At the end of the day the flow meter was observed to be stuck but water was still flowing The flow meter was replaced Optimization water was pumped on the following day September 2 1994 but no wells were gaged for product

The step test was conducted on Friday September 9 1994 RW-1 was gaged the following morning (September 10 1994) for hydraulic recovery purposes and 07 feet of product measured in the well More water for optimization of the pilot treatment system was pumped from September 12 to 14 1994 On September 12 1994 approximately 150 gallons of product and emulsion were pumped RWshy1 was gaged in the afternoon and a product thickness of 439 feet was measured This was the largest measured thickness during the entire program The DNAPL pump was deployed in the morning of September 13 1994 and a little under 8 gallons of product were removed before the pump sanded up Additional water was pumped by the Grundfos pump for optimization water Product thickness was not gaged the following morning but the flow meter was found to be clogged by sand The flow meter was repaired and the Grundfos pump used to pump optimization water

Conclusions

The above testing shows that DNAPL does recharge pumping well RW-1 When only product is pumped using an electric product pump like the ORS Scavenger pump DNAPL recharge is very slow and the environment potentially hostile to pump components Product pumping is completed in minutes and a recharge period of five to ten hours was required before another pumping cycle was initiated Utilization of a low flow pneumatic bladder pump with a flow rate in tenths of a gpm may be more successful in terms of maintaining a steady and sustainable product flow However it should be noted that the cyclic pumping did not lose the trap and that DNAPL continued to recharge the well under that pumping regimen

When the Grundfos submersible pump was utilized a DNAPL emulsion was pumped well drawdown and local hydraulic gradients increased and consequently DNAPL recharge to the well increased The additional pumping for optimization water provided a simulation of the constant rate test conditions and resulted in product intake at the pump The product proved hostile to the pump seals and caused the pump to lock up once it stopped pumping Flushing the pump

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

with water prior to shutting it off still did not prevent the pump from locking up

The pump for the constant rate test needs to be situated as low as possible in the pumping well to achieve the expected drawdowns at the outlying monitoring wells in the time frame allotted for the test Therefore the constant rate pumping test can be prosecuted in one of two ways - by separate phase pumping in tandem using a low flow product pump and a submersible pump or by total fluids pumping Either system will still require emulsion separation technology at the surface but separate phase pumping will obviously limit the volume of emulsion requiring separation There are several drawbacks to separate phase pumping the need for additional discharge line to convey the separately pumped product from the wellhead to storage establishment of the appropriate pumping rate and the creation of potential drawdown spikes in the hydraulic record during the pump testingas the product pump cycles on and off However an additional discharge line can be placed adjacent to the existing line and a drum fabricated with an air tight seal to provide DNAPL storage If the low flow product pump is utilized the exact product recharge rate for the low flow product pump will have to estimated and the possibility exists of pumping either water into the product storage (overestimate recharge) or product into the water storage (underestimate recharge) The fluctuations in drawdown arising from cycling or increases and decreases in the product pumping rate may be difficult to interpret and thus create uncertainties in the derivation of aquifer hydraulic properties Total fluids pumping will make it easier to interpret the hydraulic record given just the one pumping rate but the combined DNAPL emulsion and water mixture increases the treatment durations and costs

As stated previously the two principal objectives of the constant rate test are to determine the hydraulic parameters for the aquifer and to conduct a pilot treatment study Ebasco currently envisions the final remedial design incorporating separate phase product pumps in those wells where ONAPL is present because minimization of product and emulsion in the groundwater treatment system will improve treatment efficiency Therefore pilot testing with separate phase pumping will likely yield the most representative results for the final treatment system design

Ebasco is exploring the possibility of conducting the constant rate pumping test with a low flow product pump operating at a continuous flow several hours prior to the initiation of the test pumping in tandem with a submersible pump during the test and continuing to pump product only through the recovery period Thus the constant rate pumping drawdown will be superimposed on the continuous product pumping It is anticipated that adequate hydraulic data can be collected during the test from all of the monitoring wells in the network and the recovery data in RW-1 provided that the product pump maintains its constant rate for the test If

operation of continuous separate phase pumping for the constant rate test is impractical due to slow product recharge then Ebasco will pursue interval product pumping (short durations of pumping) activated by product sensors set below the submersible pump intake in a manner that seeks to minimize the pumping spikes in the drawdown record

The continued presence of DNAPL in the recovery well presents a ready way to extract separate phase product prior to and after the constant rate test Extraction of contaminant mass in the DNAPL phase is much more efficient than extraction in the dissolved phase Ebasco recommends continued pumping of the DNAPL in RW-1 us ing a product only pump with a product sensorcontrol relay and curtailment of pumping only to permit the execution of the constant rate test The recovered DNAPL would be drummed and removed from the site

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter Total Flow

Date Tiim RW-1 MW-113A P1-B Tank 1 Reading (gpm) (gai) Comments

82994 Initial 7145310 5945415 750NP -NP - 107 Well Bottom RW-1= 55 ft P1-Bshy 523 ft MW-113A 563ft

1107 8195300 - - - - 276

1134 _

- _ -_

575 Pumped only water to this point

1146 - - - - - 575 Pump located at 55 ft

1149 8965460 - - - - -

1153 - -_

- - 7175 Pump off at 115230 Pumped product down

1200 -5460 - - - - - At 1330 removed pump Lowered intake of product pump Put pump back down hole at 1347

1310 -5460 5965415 749NP - - -

1351 -5460 _ - - - - Start pumping at 1352

1354 -5471 - - _ _ 711 Pump off at 135445

1406 - _ - 1066shy _ _

Bottom of Tank 1 shy 1209 ft

1455 7155470 6105420 748NP - - 711 No product recovery

1601 7195470 6055420 748NP -_

- No product recovery

1655 7195470 6005420 748NP 1066NP - 711

83094 0800 7305470 6165420 750NP - - 711 Start pumping Pumping primarily groundwater with a i DNAPL

0923 - - - - 30 711 Pumping primarily groundwater with a trace DNAPL (mlt than last measurement)

0935 - - - - - 1158

NP = No Product -- = No measurement taken

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter Total Flow

Date Time RW-1 MW-113A P1laquoB Tlaquonk1 Reading (gpm) (9laquo0 Comments

83094 0945 _ - _ - 30 1467 Jar sample taken - more product than last sample

0955 1641NP 6815416 826NP - 30 1759 Graduated jar - one ounce of product per 12 ounces water

1015 - - - - - -

1102 1723NP 705420 830NP 1037NP 30 3485

1202 1735NP 6955420 830NP - 30 5135

1302 1715NP 705420 830NP - 30 6563

1419 1683NP 6915420 826NP 985NP 30 893

1510 1644NP 6875419 830NP - 30 10043

1600 1639NP 6875420 825NP - 30 11175 Interface probe coated with product but no indicator product (by sound of probe)

1702 1650NP 6905420 828NP 949NP - 12598

1830 1665NP 6955420 829NP - 25 14834 Pump off at 1831 gallons

1831 - - _ - - - Bailer indicates 12-inch product (not continuous)

83194 0800 748NP 6655420 726NP 933NP - - Changed to submersible pump and Mersey flowmetc

1000 743NP - - - 6 16564 Start pumping with Grundfos pump

1010 2210NP - - - - 17077

1020 2990NP - - - 59 17665

1045 3500NP 7705420 897NP - - 19060

1135 3596NP 7825420 906NP - 56 21887

1200 - - - 879NP 56 - Bailer indicates 12-inch product (not continuous)

NP = No Product -shy = No measurement taken

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter

WW MW-113A P1-B Tlaquonk1 Reading (gpm)

3305NP 7185423 888NP _

52

ia0NP - - - -

- - - - 10

2430shy - - _ _

34905455 7605420 895NP _ 85

- - - - 80

457shy - - - 77

- - 834NP -

44705460 8705420 930NP - 72

_ _ _ _ _

4220shy 8705420 925NP - -

7825450 6355420 785NP 810shy -

- - - - -

- - - - -

Total Flow ltgaraquo)

27016

27535

27535

28268

29115

31112

31918

-

35460

-

40090

-

-

-

amp

Comments

Pull pump to measure product in RW-1

Pump back on

Bailer indicates 1 2-inch black oily product

Flush pump in water Bailer indicates 34-inch black product Not detected by interface probe

150 gallons of product and emulsion pumped from R into Tank 1

8 gallons of DNAPL pumped from RW-1 into Tank 1 Sand entered pump

Date

83194

9194

91294

91394

Time

0100

1325

1447

1455

1505

1530

1540

1600

1630

1700

1735

0900

1030

0900

NP = No Product - = No measurement taken

STEP TEST DRAWDOWN EXTRACTION WELL RW-1

Elapsed Time (minutes)

Stepl Step 2 _A_Step3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter Total Flow

Date Tiim RW-1 MW-113A P1-B Tank 1 Reading (gpm) (gai) Comments

82994 Initial 7145310 5945415 750NP -NP - 107 Well Bottom RW-1= 55 ft P1-Bshy 523 ft MW-113A 563ft

1107 8195300 - - - - 276

1134 _

- _ -_

575 Pumped only water to this point

1146 - - - - - 575 Pump located at 55 ft

1149 8965460 - - - - -

1153 - -_

- - 7175 Pump off at 115230 Pumped product down

1200 -5460 - - - - - At 1330 removed pump Lowered intake of product pump Put pump back down hole at 1347

1310 -5460 5965415 749NP - - -

1351 -5460 _ - - - - Start pumping at 1352

1354 -5471 - - _ _ 711 Pump off at 135445

1406 - _ - 1066shy _ _

Bottom of Tank 1 shy 1209 ft

1455 7155470 6105420 748NP - - 711 No product recovery

1601 7195470 6055420 748NP -_

- No product recovery

1655 7195470 6005420 748NP 1066NP - 711

83094 0800 7305470 6165420 750NP - - 711 Start pumping Pumping primarily groundwater with a i DNAPL

0923 - - - - 30 711 Pumping primarily groundwater with a trace DNAPL (mlt than last measurement)

0935 - - - - - 1158

NP = No Product -- = No measurement taken

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter Total Flow

Date Time RW-1 MW-113A P1laquoB Tlaquonk1 Reading (gpm) (9laquo0 Comments

83094 0945 _ - _ - 30 1467 Jar sample taken - more product than last sample

0955 1641NP 6815416 826NP - 30 1759 Graduated jar - one ounce of product per 12 ounces water

1015 - - - - - -

1102 1723NP 705420 830NP 1037NP 30 3485

1202 1735NP 6955420 830NP - 30 5135

1302 1715NP 705420 830NP - 30 6563

1419 1683NP 6915420 826NP 985NP 30 893

1510 1644NP 6875419 830NP - 30 10043

1600 1639NP 6875420 825NP - 30 11175 Interface probe coated with product but no indicator product (by sound of probe)

1702 1650NP 6905420 828NP 949NP - 12598

1830 1665NP 6955420 829NP - 25 14834 Pump off at 1831 gallons

1831 - - _ - - - Bailer indicates 12-inch product (not continuous)

83194 0800 748NP 6655420 726NP 933NP - - Changed to submersible pump and Mersey flowmetc

1000 743NP - - - 6 16564 Start pumping with Grundfos pump

1010 2210NP - - - - 17077

1020 2990NP - - - 59 17665

1045 3500NP 7705420 897NP - - 19060

1135 3596NP 7825420 906NP - 56 21887

1200 - - - 879NP 56 - Bailer indicates 12-inch product (not continuous)

NP = No Product -shy = No measurement taken

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter

WW MW-113A P1-B Tlaquonk1 Reading (gpm)

3305NP 7185423 888NP _

52

ia0NP - - - -

- - - - 10

2430shy - - _ _

34905455 7605420 895NP _ 85

- - - - 80

457shy - - - 77

- - 834NP -

44705460 8705420 930NP - 72

_ _ _ _ _

4220shy 8705420 925NP - -

7825450 6355420 785NP 810shy -

- - - - -

- - - - -

Total Flow ltgaraquo)

27016

27535

27535

28268

29115

31112

31918

-

35460

-

40090

-

-

-

amp

Comments

Pull pump to measure product in RW-1

Pump back on

Bailer indicates 1 2-inch black oily product

Flush pump in water Bailer indicates 34-inch black product Not detected by interface probe

150 gallons of product and emulsion pumped from R into Tank 1

8 gallons of DNAPL pumped from RW-1 into Tank 1 Sand entered pump

Date

83194

9194

91294

91394

Time

0100

1325

1447

1455

1505

1530

1540

1600

1630

1700

1735

0900

1030

0900

NP = No Product - = No measurement taken

STEP TEST DRAWDOWN EXTRACTION WELL RW-1

Elapsed Time (minutes)

Stepl Step 2 _A_Step3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter Total Flow

Date Time RW-1 MW-113A P1laquoB Tlaquonk1 Reading (gpm) (9laquo0 Comments

83094 0945 _ - _ - 30 1467 Jar sample taken - more product than last sample

0955 1641NP 6815416 826NP - 30 1759 Graduated jar - one ounce of product per 12 ounces water

1015 - - - - - -

1102 1723NP 705420 830NP 1037NP 30 3485

1202 1735NP 6955420 830NP - 30 5135

1302 1715NP 705420 830NP - 30 6563

1419 1683NP 6915420 826NP 985NP 30 893

1510 1644NP 6875419 830NP - 30 10043

1600 1639NP 6875420 825NP - 30 11175 Interface probe coated with product but no indicator product (by sound of probe)

1702 1650NP 6905420 828NP 949NP - 12598

1830 1665NP 6955420 829NP - 25 14834 Pump off at 1831 gallons

1831 - - _ - - - Bailer indicates 12-inch product (not continuous)

83194 0800 748NP 6655420 726NP 933NP - - Changed to submersible pump and Mersey flowmetc

1000 743NP - - - 6 16564 Start pumping with Grundfos pump

1010 2210NP - - - - 17077

1020 2990NP - - - 59 17665

1045 3500NP 7705420 897NP - - 19060

1135 3596NP 7825420 906NP - 56 21887

1200 - - - 879NP 56 - Bailer indicates 12-inch product (not continuous)

NP = No Product -shy = No measurement taken

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter

WW MW-113A P1-B Tlaquonk1 Reading (gpm)

3305NP 7185423 888NP _

52

ia0NP - - - -

- - - - 10

2430shy - - _ _

34905455 7605420 895NP _ 85

- - - - 80

457shy - - - 77

- - 834NP -

44705460 8705420 930NP - 72

_ _ _ _ _

4220shy 8705420 925NP - -

7825450 6355420 785NP 810shy -

- - - - -

- - - - -

Total Flow ltgaraquo)

27016

27535

27535

28268

29115

31112

31918

-

35460

-

40090

-

-

-

amp

Comments

Pull pump to measure product in RW-1

Pump back on

Bailer indicates 1 2-inch black oily product

Flush pump in water Bailer indicates 34-inch black product Not detected by interface probe

150 gallons of product and emulsion pumped from R into Tank 1

8 gallons of DNAPL pumped from RW-1 into Tank 1 Sand entered pump

Date

83194

9194

91294

91394

Time

0100

1325

1447

1455

1505

1530

1540

1600

1630

1700

1735

0900

1030

0900

NP = No Product - = No measurement taken

STEP TEST DRAWDOWN EXTRACTION WELL RW-1

Elapsed Time (minutes)

Stepl Step 2 _A_Step3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

DNAPL Pumping Log Sheet

Depth to WaterDNAPL Flow Meter

WW MW-113A P1-B Tlaquonk1 Reading (gpm)

3305NP 7185423 888NP _

52

ia0NP - - - -

- - - - 10

2430shy - - _ _

34905455 7605420 895NP _ 85

- - - - 80

457shy - - - 77

- - 834NP -

44705460 8705420 930NP - 72

_ _ _ _ _

4220shy 8705420 925NP - -

7825450 6355420 785NP 810shy -

- - - - -

- - - - -

Total Flow ltgaraquo)

27016

27535

27535

28268

29115

31112

31918

-

35460

-

40090

-

-

-

amp

Comments

Pull pump to measure product in RW-1

Pump back on

Bailer indicates 1 2-inch black oily product

Flush pump in water Bailer indicates 34-inch black product Not detected by interface probe

150 gallons of product and emulsion pumped from R into Tank 1

8 gallons of DNAPL pumped from RW-1 into Tank 1 Sand entered pump

Date

83194

9194

91294

91394

Time

0100

1325

1447

1455

1505

1530

1540

1600

1630

1700

1735

0900

1030

0900

NP = No Product - = No measurement taken

STEP TEST DRAWDOWN EXTRACTION WELL RW-1

Elapsed Time (minutes)

Stepl Step 2 _A_Step3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN EXTRACTION WELL RW-1

Elapsed Time (minutes)

Stepl Step 2 _A_Step3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1S

015

ltu

005

1 2 Q

-005

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _e_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1

10 Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-1B

Elapsed Time (minutes)

Stepl Step 2 __Step3 _Q_Step4 Step 5

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN RECOVERY WELL 113A

Elapsed Time (minutes)

Stepl Step 2 A Step 3 a Step 4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL 113B

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-2

Elapsed Time (minutes)

Step 1 Step 2 _^_ Step 3 _a_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-3 07

06

05 0)

04

Il_iQ

03

02

01 10 100

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _B_Step4 Step 5

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-4

Elapsed Time (minutes)

Step 1 Step 2 _plusmn_Step3 _g_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS

STEP TEST DRAWDOWN MONITORING WELL P-5

12Q

Elapsed Time (minutes)

Stepl Step 2 _4_Step3 _Q_Step4 StepS