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0 <br />Proposal for <br />Various Environmental Services <br />Background, Proposed Scope of Phase H ESA <br />Page 37 <br />August 1, 2022 <br />From review of the Site documents available on Deliverables: <br />GeoTracker, A -Tech assumes that the Site ✓ Work Plan for Field Activities <br />features include three 12,000 gallon, double- V Health & Safety Plan (HASP) <br />walled, fiberglass gasoline USTs, one 500-gallon <br />double walled, fiberglass waste oil UST, and their V Orange County Boring Permit Application <br />✓ Geophysical Survey <br />associated hydraulic hoists dispensers and ✓ Field Daily Report <br />associated product lines, and vent lines. The Site V Phase II ESA Report <br />is a rectangle with approximate dimensions of 80 V Cost Proposal for Remediation Activities <br />by 120 feet. Based on this information, A -Tech ✓ Cost Allocation and Responsible Parties <br />is planning for two borings per 12,000-gallon 14( <br />UST area, one boring for the 500-gallon UST <br />area, and three borings at each 20 linear feet of <br />piping. Historically, groundwater is encountered at approximately 10 feet bgs at or near the Site <br />vicinity. The chemicals of potential concern (COPCs) at the Site include Total Petroleum Hydrocarbon <br />(TPH), and Volatile Organic Compounds (VOCs). Due to potential use and storage of lead -containing <br />gasoline, A -Tech also recommends Title 22 metals to be included as the COPCs. <br />A total of ten (10) borings will be advanced using a hydraulic direct -push technology (DPT) drilling rig. <br />The soil will be logged using the Unified Soil Classification System (USCS). Borings will be advanced <br />to a maximum of 20 feet bgs and soil samples will be collected starting at 1.0 feet bgs and repeated at 5.0, <br />10.0, 15.0, and 20.0 bgs. Because of the shallow groundwater, samples will be collected in borings where <br />groundwater is encountered using hydropunch valves. In addition, we will install soil vapor probes at 5.0 <br />and 15.0 ft bgs at three selected borings and collect six soil vapor samples with summa canisters. The soil <br />samples will be collected in acetate -lined sleeves capped with Teflon' tape and airtight plastic caps. The <br />samples will be packed in ice and transported to a State -Certified laboratory for analysis, with proper <br />Chain -of -Custody documentation. All work will be performed under the oversight of a state of California <br />certified Professional Engineer. Field Quality Assurance/Quality Control (QA/QC) measures include <br />collecting field duplicate samples, equipment blank at the end of the day, and one trip blank for sample <br />transports. All discrete samples collected at 1.0, 5.0, and 10.0 feet bgs will be initially analyzed for <br />VOCs by EPA Method 8260B, Title 22 metals by EPA Method 6010B, and TPH by EPA Method 8015. <br />The soil vapor samples will be analyzed for VOCs using EPA Method TO-15. Groundwater samples will <br />also be analyzed for the same COPCs. Samples at 15.0, and 20.0 feet bgs will be placed on hold for <br />further analyses if initial shallow samples return at an elevated level. <br />Work Plan and Pre -Field Activities <br />A -Tech will conduct this Phase II ESA in accordance with procedures set forth in Section Ld of this <br />proposal. A -Tech will prepare a work plan for the scope described above and in accordance with ASTM <br />E1903-19. After review of the work plan by the City, it is submitted to the Water Board for approval <br />before implementation. Additionally, a project -specific Health and Safety Plan (HASP) will be <br />developed outlining the various hazards associated with the proposed scope of work. Because the borings <br />will potentially reach to the groundwater, A -Tech will obtain a Well Construction, Well Destruction, <br />Test and Exploratory Hole permit from the Orange County Health Care Agency. The permit processing <br />OR A -Tech Consulting, Inc. <br />