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Workplan for Exploration Borings <br /> Brown Sand Inc.Mossdale Plant <br /> Lathrop,California <br /> Page 2 <br /> Task 2 —Field Work (Exploratory Soil Borings) <br /> To explore the subsurface conditions beneath the Site, Condor proposes to advance fifteen(15)exploration <br /> borings to a depth of up to 60 feet bgs (Boring Identified as EB-13 through EB-27). Soil samples will be <br /> collected at selected depth intervals of the borings for geologic evaluation. We anticipate the soil borings <br /> will be advanced utilizing mud rotary drilling methods.The soils encountered will be examined and visually <br /> classified in accordance with the Unified Soil Classification System by a geologist. A geologic log will be <br /> produced for each boring. <br /> Upon completion, the borings will be backfilled in general accordance with San Joaquin County <br /> Environmental Health Department(SJCEHD) Guidelines. According to email correspondence with Jeffrey <br /> Wong (Lead Senior Registered Environmental Health Specialist) of SCJEHD, due to the sandy nature of <br /> the subsurface beneath the lean clay, as describe in the subsurface condition section of the workplan, a <br /> variance was granted to allow for the borings to be backfilled with clean sand to 30 feet bgs, then finished <br /> with neat cement grout to 5 feet bgs. Surface conditions will be restored by backfilling the remaining 5 feet <br /> with surrounding soil. Correspondence with SJCEHD staff is included in Attachment C. <br /> A Site-Specific Health and Safety Plan, including a hospital map, is included in Attachment D. <br /> We appreciate your time to review this workplan and trust it will meet your needs. If you have any <br /> questions, please feel free to contact me at 209.513.7634. <br /> Respectfully submitted, <br /> CONDOR EARTH <br /> Luke Castle, PG No. 9945 <br /> Associate Geologist <br /> Attachments: <br /> Attachment A— Proposed Exploratory Boring Location Map <br /> Attachment B —November 2019 Boring Logs and Boring Locations <br /> Attachment C— SJCEHD Correspondence <br /> Attachment D— Site-Specific Health and Safety Plan <br /> XdProjea02000_pp@I36 Brown Sand@136M EsploralionXRepons\N'orkplan and Nrna1s%'.,kp1an\WP 20231013 Ex Bonngs.docs <br /> A <br /> is CONDO <br />