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Ms. Marilyn Petruescu <br /> September 30, 2024 <br /> Groundwater Monitoring and Reporting <br /> Quarterly groundwater monitoring at MW-1 R, -2, -3, and -4 is proposed for a period of two years to evaluate <br /> plume stability. Groundwater samples will be analyzed for the following parameters: <br /> • TPHg TPHd, and TPHo by USEPA Test Method 8015B, and <br /> • BTEX, naphthalene, MTBE, and 1,2-DCA by USEPA Test Method 8260B. <br /> Groundwater monitoring reports will be submitted on an annual basis on or before February 15 of each year. <br /> CLOSING <br /> Arcadis will initiate the proposed pre-field and field activities following CVRWQCB approval of this Work Plan. The <br /> field schedule will be dependent on subcontractor availability. Please contact Lauren Sipich at (916) 707-4161 if <br /> you have any questions or comments regarding this Work Plan. <br /> tAAL <br /> Sincerely, �o�J��N M. S00 <br /> Arcadis U.S., Inc. <br /> 86126�'` * No. 9652 <br /> Ar EXP Ss1a <br /> ClVIt * q�fOrCAI�F��� <br /> Jo Darby, PE-CA(C-86125) oFd� Lauren Sipich, PG-CA(9652) <br /> Technical Expert, Engineer Senior Geologist <br /> Copies: <br /> Lisa Waskom, GSH <br /> Enclosures <br /> Table 1 —Well Construction Details <br /> Figure 1 —Site Location Map <br /> Figure 2—Site Overview <br /> Figure 3—Site Plan with Historical Soil Analytical Data <br /> Figure 4— Proposed Monitoring Well and Soil Boring Locations <br /> Attachment 1 —CVRWQCB Correspondence—June 11, 2024 <br /> www.arcadis.com 6/7 <br /> Lathrop UST Site Investigation and Well Installation WP 9.30.24_final <br />