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k'g KLEINFELDER Additionally, PHS/EHD will charge Granite Construction an initial 3-hour minimum and any additional oversight charges above the permit fees to be submitted by Kleinfelder. These fees will be billed directly to Granite Construction by the PHS/EHD. Kleinfelder will forward the appropriate "billing and compliance acknowledgement forms" to Granite Construction for signature. Signed originals of the forms and the initial 3-hour oversight fees must be submitted to PHS/EHD as part of the permit process. Kleinfelder will also contact Underground Service Alert 48 hours prior to conducting field work to notify local utilities of our proposed subsurface assessment. Kleinfelder will additionally prepare a health and safety plan prior to the actual field assessment. Task E02—Piezometer Installation Six (6) soil borings will be advanced in two gravel pits located at the Tracy facility, just southeast of the intersection of Corral Hollow Creek and the Delta Mendota Canal. Three piezometers will be installed in each of two pits. The six piezometers will be installed to maximum depths ranging from approximately 50 to 55 feet below ground surface (bgs) from the bottom of each gravel pit. The six borings will be drilled approximately 15 feet into groundwater. Piezometers will be constructed in each boring. During the advancement of the borings, soil samples will be collected at five foot intervals for lithologic classification only. However samples will not be collected in gravel/cobble areas. Lithologic classification will be based on the Unified Soil Classification System (USCS). Currently, based on our experience, we anticipate groundwater in the vicinity of the project site to be present at an elevation of about 65 feet above mean sea level (msl). Kleinfelder understands the bottom elevation of each pit is about 100 to 105 feet above msl. Upon completion of the drilling, a 2-inch diameter PVC piezometer will be installed in each of the borings. The piezometers will be constructed as described for monitoring wells in Attachment B. The piezometers locations and elevations will be surveyed, by subcontractors for Granite Construction, so that subsequent water level sounding data can be utilized in determining groundwater flow directions and gradient as described in Attachment B. Task EO3—Piezometer Development and Water Level Survey Approximately forty-eight hours after installation, the six new piezometers will be developed to remove sediment from the bottom of each piezometer, remove sediment laden water, and to increase the hydraulic radius of the piezometers. Development will be performed using a pneumatic pump and as generally described in Attachment B. Water level measurements will be [Wade in the piezometers greater than 48 hours after development according to the protocol described in Attachment B. The depth to groundwater measurements will then be converted to relative groundwater elevations with respect to mean sea level or a local 20-YP9-278/2019P314/2019W028 Page 2 of 6 Copyright 1999,Kleinfelder,Inc. October 27, 1999