HomeMy WebLinkAboutAgenda Report - February 20, 2013 C-03AGENDA ITEM .3
CITY OF LODI
COUNCIL COMMUNICATION
TM
AGENDA TITLE: Approve Plans and Specifications and Authorize Advertisement for Bids for Western
and Southern Plume Monitoring Well Construction Project
MEETING DATE: February 20, 2013
PREPARED BY: Public Works Director
RECOMMENDED ACTION: Approve plans and specifications and authorize advertisement for
bids for Western and Southern Plume monitoring well construction
project.
BACKGROUND INFORMATION: The Groundwater Monitoring Plan for the Western and Southern
Plume Areas prepared February 2011 by Treadwell and Rollo
established a groundwater monitoring and reporting plan for the
Western and Southern Plume areas. Previously conducted investigations have generally defined the
extent of the groundwater pollution as shown in Attachment A.
Using the City's groundwater model prepared by Treadwell and Rollo, combined with the results of
previous investigations, locations and depths were identified for additional monitoring facilities. As a
result, three monitoring well clusters are proposed for construction at the locations identified in
Attachment B (WMW 1A,B,C,D; WMW 2 A,B,C; and SMW 1A,B). At each monitoring well location, two to
four discrete depth levels will be monitored using either multi-level monitoring wells or clustered monitoring
wells, each constructed to sample from a single discreet depth. The final discreet depths and associated
well screen locations will be determined during construction and in consultation with the Regional Water
Quality Control Board `(Board). On November 9, 2012, the Board issued approval of the draft plan for
monitoring well construction.
Following installation of the new monitoring wells, a quarterly monitoring program will be implemented that
will include one existing monitoring well in the Western Plume and 13 existing monitoring wells in the
Southern Plume.
FISCAL IMPACT: Not applicable.
FUNDING AVAILABLE: Funding will be presented at award of the construction contract.
F. Wally Yandelin
Public Works Director
FWS/pmf
Attachments
m, City Manager
K:\WP\PROJECTS\WATER\PCE,TCE\CPSA Western Southern Plume Monitoring Wells.doc
2/11/2013
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Treadwell & Rollo CAGIS\3923\3923_22\arcmap_doc\3923-22-040.mxd
Legend
Q Monitoring Well
Western PCE Contours, 2007 (pg/L)
❑ City Water Supply Well
— — Deep PCE Contour, Inferred (>75 ft)
Central Plume Monitoring Well
Deep PCE Contour (>75 ft)
— Railroad
----- Shallow PCE Contour, Inferred (<75 ft)
Park
— Shallow PCE Contour (-75 ft)
Mokelumne River
Southern Plume Contours, 2008 (pg/L)
School
PCE + TCE + 1,1.DCE
--- Inferred Contour
— Isoconcentration Contour
Treadwell & Rollo CAGIS\3923\3923_22\arcmap_doc\3923-22-040.mxd
WESTERN AND SOUTHERN
PLUME AREAS
Date 1/31/20111 Project No. 730392333 1 Figure 1
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Attachment A
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GROUNDWATER MONITORING
Lodi, California
WESTERN AND SOUTHERN
PLUME AREAS
Date 1/31/20111 Project No. 730392333 1 Figure 1
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Attachment A
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Legend
Proposed Nested Wells or Well Cluster - Road
Soil Boring Railroad
a Monitoring Well Parcel
I Water Supply Well
Abandoned Water Supply Well
Notes G1—Pr°i"`
City of Lodi, Public Works Depararlent
J. Stale Plane California III Groundwater Monitoring
RIPS 0403 Feel. Lodi, San Joaquin County, California
2 Base data provided by the City Figure No,
of Lodi, Public Works Department. z
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Existing and Proposed
Well Locations
Attachment B