Agmt18 Groundwater & Environmental Services, Inc.

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EXHIBIT "A" SCOPE OF SERVICES Consultant will conduct five groundwater monitoring events, between December 2017 and December 2018, and implement the Remedial Action Plan for the Sequoia Station site. Specific tasks that Consultant will perform are outlined below. Task 1— Ongoina Groundwater Monitoring Program Consultant will conduct five groundwater monitoring events, one each quarter, beginning with December 2017 and ending with the fourth quarter of 2018. Task 1.1 —Task management(field preparation • Consultant will coordinate with the City and site property owners to schedule monitoring events in advance. Consultant will also coordinate with the chemical testing laboratory to arrange for sample shipments and analyses. Task 1.2 — Well gauging and groundwater sampling • Consultant will measure the depth to groundwater, and purge and sample groundwater from the 18 accessible monitoring wells, plus an additional well that will be installed during the pilot phase of the remedial action plan. • Consultant will gauge and sample onsite wells in accordance with the reduced monitoring schedule that has been in place since 2016, as well as the one offsite well installed on City property in 2008 by Genesis Engineering and Redevelopment (Genesis) at the intersection of Jefferson Avenue and Middlefield Road as part of the negotiations with the Bolton family. • Consultant will purge at least three well casing volumes of groundwater from each well to be sampled, using a Waterra pump and dedicated tubing; • Consultant will measure pH, temperature, and electrical conductivity until the measurements are stable; • Consultant will collect a groundwater sample from the wells scheduled for sampling; • Consultant will submit samples to a California certified analytical laboratory for analysis of selected halogenated volatile organic compounds (HVOCs) by EPA Method 82608, as well as for selected bioremediation parameters, as needed; and • Consultant will place purge water in 55 -gallon drums for proper disposal. Task 1.3 — Chemical analysis of groundwater samples • Consultant will submit groundwater samples to a State -certified chemical testing laboratory under chain -of -custody for analysis of a select list of HVOCs that include: PCE; TCE; cis-1,2-DCE; trans-1,2-DCE; 1,1-DCE; and vinyl chloride, by EPA Method 82608. • Each quarter, consultant will submit groundwater samples from two selected wells to Microbial Insights laboratory for microbial (DNA) analyses of REV: 12-18-17 MI Page 9 of 12 ATTY/AGR.2017.296/GES - groundwater monitoring and remediation