Finance Committee - Agenda - 2/2/2022 - P30
Cost Overage / Change Order FY 2022
ChemServe Environmental Analysts
RFPO931-041321
PO #165137
PO #165137 was issued to ChemServe for groundwater sampling and laboratory analytical costs
at the City’s Four Hills Landfill, Old Nashua Landfill, Shady Lane Landfill, and Rousell Park Landfill
in FY 2022 through FY 2024. PO #165137 approved $42,339 for FY 2022, based upon known
monitoring requirements as of April 2021.
Following issuance of the PO, in August 2021 NHDES requested expanded groundwater
sampling, and the initiation of soil and sediment sampling in the southern area of the Four Hills
Landfill, with time-critical deadlines. The City used ChemServe for the time-critical sampling
and analytical services using unit rates approved in PO #165137. The expanded sampling
continued per NHDES request in September, October, November, and December 2021 and
included monitoring of three additional monitoring wells (including analysis for PFAS), sampling
of surface water in stormwater retention ponds, and collection and analysis of 20 plus soil and
sediment samples to comply with the NHDES requests.
Per current NHDES requests, monthly assessment monitering is required to continue, so a
January 2022 sampling event will be needed, and an already planned for February 2022
sampling event will need to be expanded. The City’s consultant, Sanborn Head & Associates,
believes following the February 2022 sampling event, that the monthly sampling requirement
can be revised to quarterly. However, should the NHDES not approve the recommendation to
reduce the monitoring from monthly to quarterly, it would be prudent to plan for completion of
assessment monitoring in March, May, and June 2022 (and costs to expand the already
required/budgeted April 2022 GMP event should also be included).
2022 Cost Overage Summary and Change Order Projection
$42,339 FY 2022 approved (PO #165137).
($54,268) Costs invoiced for planned and unforeseen groundwater sampling through Nov
2021
= $11,929 Additional costs invoiced to date for soil and sediment sampling, and expanded
groundwater monitoring through November 2022 (not included in PO}.
+ §2,585* December 2021 Assessment Monitoring {invoice pending*)
+ $4,528* January 2022 Assessment Monitoring
+$3,641* February 2022 Assessment Monitoring ($4,528 less $887 already in PO)
+$4,528* March 2022 Assessment Monitoring
+ $4,528* Expand April 2022 GMP Monitoring Event
+$4,528* May 2022 Assessment Monitoring
+ $4,528* June 2022 Assessment Monitoring
$40,795 = Change Order Amount for PO# 165137, ChemServe FY 2022
*see attached draft invoice for December 2021 sampling and email from ChemServe with cost
summary for February through June 2022 monthly assessment monitoring events.
January 11, 2022 Page lofi
