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Grant County
Department of Public Works
124 Enterprise St. S.E.
Ephrata, WA 98823
To: Honorable Board of County Commissioners
Grant County
From: Sam Castro
Public Works Director
Date: January 11, 2021
Re: Landfill Remediation Change Order:
Authorization to Install Transducers per Change Order.
Serial No. 21.011
This signature page, attached work scope (Exhibit A), work budget (Exhibit B), and historic
project budget table (Exhibit C) constitute Change Order 14 to the contract dated August 6,
2007 between the Grant County and Pacific Groundwater Group (PGG). Change Order 14
covers costs for an expanded North End Water Level Study at the Ephrata Landfill. The
expanded study includes instrumenting 25 targeted north end wells with pressure transducer
dataloggers to continuously monitor water levels during the 2021 year. The number of wells
on the North end recently doubled with the installation of 76 new monitoring wells during the
Phase I North End Supplemental Investigation. The transducer data, together with manual
water level measurements of north end wells, will be used to improve our understanding of
groundwater flow and hydraulic interconnection within the contaminated basalt water
bearings zones on the north end of the Ephrata Landfill. This change order covers costs for
the expanded the water level study as summarized in Exhibit A.
The additional budget under Change Order 14 is $55,464 which brings the total authorization
under the original 2007 contract to $3,834,103.00 (Exhibit Q.
Dated this I" L day of WUM, 2021
Board of County onmi ssio rs
Grant County, Washington
A_PPrQ-V9 Disapprove Abstain
Dist -#—IM Dist #1 Dist #1
Dist #2FF Dist #2 Dist #2
Dist #31WDist #3 Dist #3
"To meet current and future needs, serving together with public and private entities, while fostering a respectful and successful
work environment."
Information .................................................(509) 754-6082 Keith Elefson, County Road Engineer ................... Ext. 3502 Ed Lowry, Supervisor -Dist. No. i................................Ext. 3540
FAX ..................
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....................................... (509) 754-6087 Bob Bersanti, Construction Engineer .................... Ext. 3503 Mike DeTrolio, Supervisor -Dist. No. 2 ........................ Ext. 3591
E-mail ............................. publicworks@grantcountywa.gov Loc Ohl, Accountant Lead ....................................... Ext. 3555 John Brissey, Supervisor -Dist No. 3 ........................... Ext. 3541
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