Agmt21 Groundwater and Environmental Services, Inc.

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During the remediation activities, the Consultant shall prepare brief monthly written Progress Reports that describe work completed by the remediation contractor during the previous month and any impediments or problems encountered during the field activities that were different than anticipated, as well as measures taken to resolve those issues. It is estimated no more than four (4) Progress Reports will be necessary. Task 3 — Ongoing Groundwater Monitoring Program Consultant shall complete groundwater monitoring events, as requested by the City and required by the RWQCB, not to exceed eight (8) events total. a. Task 3.1 — Task Management & Field Preparation Consultant shall manage the groundwater monitoring tasks and coordinate with the City and property owners to schedule monitoring events in advance. Consultant shall coordinate with the chemical testing laboratory on sample shipments and analyses and plan the completion of the groundwater monitoring tasks. b. Task 3.2 — Well Gauaina & Groundwater SamDlin Consultant shall measure depth to groundwater and purge and sample water from all accessible monitoring wells (a total of 23 wells). Each monitoring event, Consultant shall: i. Gauge and sample accessible onsite wells and one offsite well installed on City property at the intersection of Jefferson Avenue and Middlefield Road ii. Measure pH, temperature, and electrical conductivity until the measurements are stable iii. Collect a groundwater sample from accessible wells using low -flow sampling procedure with a peristaltic pump and dedicated tubing iv. Submit samples to a California certified analytical laboratory for analysis of selected halogenated volatile organic compounds (HVOCs) by EPA Method 8260B, as well as for selected bioremediation parameters, as needed V. Place purge water in 55 -gallon drums and coordinate proper disposal C. Task 3.3 - Chemical Analvsis of Groundwater Samples REV: 05-07-2021 MI Consultant shall submit 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 8260B. For the groundwater monitoring event preceding the start of injection remediation activities, as requested and approved by the City, Consultant may also perform additional chemical analyses on several selected groundwater samples for the purpose of establishing ATTY/AGR.2021.102/Groundwater and Environmental Services, Inc. (Page 13 of 15)