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4080 Plaza Goldorado Circle, Suite B Cameron Park, California 95682 USA www.ghd.com Our ref: 11114657 11 February 2022 Mark Pishinsky Environmental Manager Rain for Rent 26001 S Arizona Avenue Chandler, AZ 85248 Process Water Spill Response, J.R. Simplot Facility, Lathrop, California Dear Mr. Pishinsky GHD is pleased to provide this report to document spill response activities at the J.R Simplot facility located in Lathrop, California. An accidental spill of process water occurred on January 24, 2022 near the detention ponds off McKinley Avenue (Figure 1). Rain for Rent requested GHD collect stockpile profile and background samples to support their spill response activities. The following is a summary of spill response activities undertaken by Rain for Rent and GHD. Prior to mobilization to the site, GHD prepared a site-specific health and safety plan and contracted with a California state-certified laboratory for soil sample analysis. On January 28, 2022, GHD arrived at the site and checked in with Greg McDevitt of Rain for Rent. Prior to GHD's arrival at the site, Rain for Rent had scraped approximately 700 square feet to 4-inches below grade with a skid steer and stockpiled approximately 20 to 25 cubic yards of process water impacted soil. After conducting a tailgate safety meeting, GHD collected a 4x1 composite soil sample (SP-1A through SP-1D, composited at the laboratory) from four different locations around the stockpile. The soil samples were collected by digging into the stockpile a minimum of 6-inches in four different locations with a trowel and filling the laboratory supplied containers. After the collection of the composite sample, Rain for Rent placed the stockpiled soil into roll-off bins pending profile analytical results and transport to an appropriate disposal facility. GHD also collected a discrete background soil sample (BG-1) in a laboratory supplied container approximately 50-feet north of the stockpile at the request of Mr. McDevitt. The process water spill area, and stockpile location are shown on Figure 1. After collection, soil samples were labeled, logged on a chain-of-custody (COC) form, stored on ice, and transported to Eurofins TestAmerica in West Sacramento, California, for the following analyses: Volatile organic compounds (VOCs) by EPA Method 8260B CAM 17 Metals by EPA Method 6010B/7471A pH by EPA Method 9045C The laboratory analytical report is included as an attachment to this report. No VOCs were detected in the composite stockpile sample or the background sample. As shown in Table 1 below, several metals were detected in the composite sample and the background sample but the results are well below California and Federal hazardous waste thresholds. Both samples had a neutral pH. This document is in draft form. The contents, including any opinions, conclusions or recommendations contained in, or which may be implied from, this draft document must not be relied upon. GHD reserves the right, at any time, without notice, to modify or retract any part or all of the draft document. To the maximum extent permitted by law, GHD disclaims any responsibility or liability arising from or in connection with this draft document. 4 The Power of Commitment Rain for Rent 11114657