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TETRA TECH <br /> Memorandum <br /> TO: DATE: <br /> San Joaquin County March 10,2020 <br /> Environmental Health Department <br /> FROM: PROJECT NUMBER: PHONE NUMBER: <br /> Shawn Morrish TET 20-184E (909)860-7777 x <br /> 3200 <br /> RE: <br /> Well Permit Application—Soil Borings(Supplemental Information) <br /> Drilling on Forward Landfill,Manteca,San Joaquin County <br /> This memorandum provides additional information for the attached Well Permit Application for <br /> drilling 5 Hollow Stem Auger(HSA) borings for a geotechnical investigation at Forward Landfill <br /> (see Figure 1) located at 9999 S Austin Rd, Manteca, California. The borings are needed to <br /> characterize soil properties for the design of a gas pipeline and facility. <br /> Depth to groundwater at the site is currently estimated at 60 feet below the ground surface. The <br /> soil borings will be advanced to a maximum depth of 50 feet. The soils borings will be drilled <br /> with a HSA truck-mounted rig. It is anticipated that native earth materials within the boring will <br /> consist primarily of valley soil deposits. <br /> The boreholes will be backfilled with a mix and placed per the Environmental Health Department <br /> guidelines. Grouting for the borings will be performed from the bottom of the hole to 12 inches <br /> below grade. The upper 12 inches will be tamped with clean soils to the surface. All backfilling <br /> and grouting will be done per the San Joaquin County — Environmental Health Department <br /> guidelines for well construction/decommissioning specified requirements. <br /> Attachments: - Figure 1 - Boring Location Map <br /> - Application for Well Permit(Soil Borings) <br /> - Online payment: $1064.00 (permit fee for 5 soil borings)+$24.37 (processing <br /> fees) =$1088.37 total <br /> Filename:Forward Landfill Well Permit Application Memo <br /> 21700 Copley Drive#200"Diamond Bar,CA 91765*Tel:909-860-7777*www.tetratech.com <br />