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REV: 10-05-2022 VR <br />A total of 59 temporary injection points shall be advanced using direct-push <br />technology. 43 probe points shall be advanced to a depth of approximately <br />20-ft bgs (in the area immediately SW of the Former Video Store building), <br />while 16 probe points shall be advanced to a depth of approximately 22 ft <br />bgs in the area located at the backside of the Safeway Shopping Center <br />building; <br />Delivery point spacing shall be 12 to 14 ft. on center and laid out in a grid <br />pattern with approximately 12 treatment rows while maintaining the 12 to 14 <br />ft. spacing requirement; <br />Sequential rows of ERB delivery points shall be offset (odd vs even) to <br />produce a zig-zag pattern; <br />The emplaced thickness shall be approximately 14.0 ft. for probe points <br />advanced to a depth of 20 ft. bgs and 16.0-ft. for probes advanced to a depth <br />of 22 ft. bgs.; and <br />The treatment surface area shall encompass approximately 15,500 ft2. <br />The orientation and spacing of the injection point locations shall be slightly <br />adjusted to account for existing structures such as monitoring wells, curb <br />dividers and landscape islands, while preserving the zig-zag pattern. Exact <br />injection point locations shall be reviewed and approved by the Public Works <br />Director or designee before injection. <br />Approximately 33 gallons of EVO agent shall be injected at each probe point <br />advanced to a depth of 20 ft. bgs (43 total), and 37 gallons of EVO agent shall <br />be injected at probe points advanced to a depth of 22 ft. bgs (16 total), totaling <br />approximately 2,011 gallons of EVO to be injected through 59 probe points. <br />Consultant has selected and estimates a target injection rate for each individual <br />injection point to range between 3 and 5 gpm. The estimated pressure required <br />to initiate injection is estimated to range between 75 and 85 psi with a target <br />maintenance pressure of 65 to 75 psi. Injection volumes and pressures will vary <br />based on actual injection rates encountered in the field and the lithology of <br />formation. Consultant shall confer with the Public Works Director or designee to <br />determine the optimum pressure to maintain the injection flow rate as to limit <br />fracturing of the formation. <br />1.4.2. Drilling and Delivery Specifications – Consultant shall install EVO injection points <br />by a direct push drill rig. Consultant shall use a drill rig to advance 1.5-inch direct- <br />push rods equipped with an injection tip through pre-cleared boreholes to the final <br />pre-determined depth. The final depth of each push probe shall be dependent upon <br />the location within the “E” Wells Area. Injection shall commence in 2 ft. intervals <br />working downward in a ‘top down’ sequence. <br />Consultant shall use flow meters and pressure gauges to control injection volume <br />and pressures and make every effort to minimize daylighting of reagents. <br />Consultant shall document injection point feedback, targeted injection depths, EVO <br />volumes, and pressures at each injection point. Consultant shall mix slurry to meet <br />injection load/mass requirements per interval. Based on injection point feedback, <br />targeted injection depths, reported EVO volume and pressures, the Consultant shall <br />calculate and field verify the targeted radius of influence and distribution of reagent. <br />If ground heave or flow back (daylighting) is encountered during injection, the <br />Consultant shall stop injection immediately and evaluate options with the Public <br />ATTY/AGR.2022.348/Regenesis Bioremediation Products (Page 18 of 34)