SL0601754315_Air Sparge Performance_E2C_02.01.2016
1020 Winding Creek Road, Suite 110, Roseville, CA 95678
tel 916.782.8700 fax 916.782.8750
February 1, 2016
Ms. Lisa Dernbach, C.H.G.
Senior Engineering Geologist
CRWQCB – Lahontan Region, South Lake Tahoe Office
2501 Lake Tahoe Boulevard
South Lake Tahoe, CA 96150
SUBJECT: January 4, 2016 O&M Air Sparge Performance Test Data Summary
Lake Tahoe Laundry Works
1024 Lake Tahoe Boulevard
South Lake Tahoe, California
Dear Ms. Dernbach:
Attached is our report on the results of our recent O&M zone of influence testing that Fox and
Seven Springs mentioned to you in January 2016.
If you have any questions, or comments, please call the undersigned, or Phil Goalwin, at 916-
782-8700.
Sincerely,
E2C Remediation
cc: Mr. Scott Reisch, Partner
Hogan Lovells US LLP
One Tabor Center, Suite 1500
1200 Seventeenth Street
Denver, CO 80202
Mr. William F. Tarantino, Partner
Morrison & Foerster LLP
425 Market Street
San Francisco, CA 94105
Aiguo Xu, Ph.D.
Principal Engineer
C.E. # 72685
1020 Winding Creek Road, Suite 110, Roseville, CA 95678
tel 916.782.8700 fax 916.782.8750
January 12, 2016
Subject: JANUARY 4, 2016 AIR SPARGE PERFORMANCE TEST DATA SUMMARY
Lake Tahoe Laundry Works
1024 Lake Tahoe Boulevard
South Lake Tahoe, California
E2C Remediation (E2C) is pleased to present this summary of O&M air sparge
performance test conducted on January 4, 2016.
1) Selection of testing wells and monitoring wells
Three air sparge wells (AS-16, AS-6 and AS-8) were selected. See Figure 1 for
their locations. Four groundwater monitoring wells (MW-11S, MW-9S, MW-5S,
and MW-5D) were used for monitoring groundwater level changes and air
pressure changes.
The distance between AS-16 and MW-11S is approximately 10.5 ft;
The distance between AS-6 and MW-9S is approximately 23.7 ft;
The distance between AS-8 and MW-5S is approximately 31.2 ft;
The distance between AS-8 and MW-9S is approximately 50.9 ft;
2) Testing Method
a. Depth to water and wellhead air pressure were measured before the test
began;
b. Compressed air was applied at AS-16, AS-6 and AS-8 one well at a time,
sequentially. The applied flow rate ranged from approximately 2 to 6 scfm at
a pressure of 17 psi; c. Depth to water and air pressure were measured at MW-11S, MW-9S, MW-
5S, and MW-5D at an interval of approximately 15 minutes;
d. Measurements were recorded on field data sheets (see attached).
3) Testing Results
Both depth to water and air pressure changes were observed at the
monitoring wells MW-11S, MW-9S and MW-5S;
Little variation of depth to water and air pressure was observed at MW-5D;
Conclusion
The air sparge performance test confirmed that the radius of influence at the site from
individual air sparge wells at the site exceeds 25 ft.
Page 2 of 2
1020 Winding Creek Road, Suite 110, Roseville, CA 95678
tel 916.782.8700 fax 916.782.8750
Based on 25 ft radii, the air sparge plan view coverage is illustrated in Figure 2.
Please contact Aiguo Xu or Philip Goalwin at 916-782-8700, if there are any questions
regarding this air sparge performance test.
Respectfully, E2C Remediation
Attachments: Test Field Data Sheets
Figure 1 Site Plan
Figure 2 Air Sparge Radii of Influence
Aiguo Xu, Ph.D.
Principal Engineer
C.E. # 72685
LAKE TAHOE LAUNDRY WORKS
1024 LAKE TAHOE BOULEVARD
SOUTH LAKE TAHOE, CALIFORNIA
TRANSIT
STATION
FIGURE
1
SITE PLAN
LAKE
T
AHOE
B
O
U
L
E
V
ARDGLORENE AVENUERALEYS
LTLW
LEGEND
SZA Groundwater
Monitoring Well
LW-MW-1S
0 FT 50 FT
N
LW-MW-5S
LW-MW-1S
LW-MW-5S
LW-MW-2S
LW-MW-11S
LW-MW-13S
LW-MW-9S
LW-MW-10S
LW-MW-12S
SZA Groundwater
Monitoring Well
LW-MW-13S
VP-1
VP-2
VP-3 VP-4
VP-5
VP-6
VP-7
VP-10
VP-8
VP-9
Soil-Gas Assessment Vapor Sampling Point
VE-1
VE-12
VE-13
VE-2
VE-19
VE-20
VE-18
VE-17
VE-16
VE-6
VE-7VE-10
VE-9
VE-15
VE-8
VE-14
VE-3
VE-5
VE-4
VE-11
VE-1
SVE Well
25 ft Radius
23.75'50.91'31.2
2'
10.57'
AS-1
AS-2
AS-3
AS-4 AS-5
AS-10
AS-8
AS-16
AS-11
AS-7
AS-13
AS-6
AS-20
AS-9
AS-15
AS-12
AS-14
AS-19
AS-21
AS-18
AS-22
AS-17
AS-23
AS-24
AS-25
AS-1
AS Well
AS-26
AS-27
Horizontal SVE Well Locations
(southern trench - 4 30’ HVE/northern trench 3 30’ HVE)
1020 Winding Creek Rd., #110, Roseville, CA 95678
Phone: (916) 782-8700 Fax: (916) 782-8750
FIGURE
2
AIR SPARGE RADII OF INFLUENCE
LAKE
T
AHOE
B
O
U
L
E
V
ARDGLORENE AVENUERALEYS
LTLW
LEGEND
SZA Groundwater
Monitoring Well
LW-MW-1S
0 FT 50 FT
N
LW-MW-5S
LW-MW-1S
LW-MW-5S
LW-MW-2S
LW-MW-11S
LW-MW-13S
LW-MW-9S
LW-MW-10S
LW-MW-12S
SZA Groundwater
Monitoring Well
LW-MW-13S
VP-1
VP-2
VP-3 VP-4
VP-5
VP-6
VP-7
VP-10
VP-8
VP-9
Soil-Gas Assessment Vapor Sampling Point
VE-1
VE-12
VE-13
VE-2
VE-19
VE-20
VE-18
VE-17
VE-16
VE-6
VE-7VE-10
VE-9
VE-15
VE-8
VE-14
VE-3
VE-5
VE-4
VE-11
VE-1
SVE Well
25 ft Radius
23.75'50.91'31.2
2'
10.57'
AS-1
AS-2
AS-3
AS-4 AS-5
AS-10
AS-8
AS-16
AS-11
AS-7
AS-13
AS-6
AS-20
AS-9
AS-15
AS-12
AS-14
AS-19
AS-21
AS-18
AS-22
AS-17
AS-23
AS-24
AS-25
AS-1
AS Well
AS-26
AS-27
Horizontal SVE Well Locations
(southern trench - 4 30’ HVE/northern trench 3 30’ HVE)
1020 Winding Creek Rd., #110, Roseville, CA 95678
Phone: (916) 782-8700 Fax: (916) 782-8750
LAKE TAHOE LAUNDRY WORKS
1024 LAKE TAHOE BOULEVARD
SOUTH LAKE TAHOE, CALIFORNIA
TRANSIT
STATION