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Mr. Jeff Gymer Draft Post-Remediation Soil Gas Probe Destruction Workplan Former Lodi MGP Site December 17, 2015 FIELD PREPARATION ACTIVITIES Prior to initiating the field work the following activities will be conducted: • Obtain permits for the destruction of soil gas probes PRSG-1 through PRSG-8 from the San Joaquin County Environmental Health Department; • Notify Underground Service Alert (USA) a minimum 48 hours prior to the beginning of the work for the identification of all underground utilities; and, • Conduct an underground utility survey using a private 3' part utility locator to supplement USA to identify utilities within 10-feet of each probe. SOIL GAS PROBE DESTRUCTION Soil gas wells PRSG-1 through PRGS-8 were drilled to total depths ranging from 8.5 to 15.5 feet below ground surface (bgs). Each of the soil gas wells contain dual-depth probes (one shallow and one deep) each constructed of 1/4-inch Teflon® tubing and 6-inch long stainless steel probes. The shallow probes were installed at depths of 5.25 feet bgs,with the exception of probe PRSG-5 where the shallow probe was installed at 7.25 feet bgs. The deep probes were installed 3-inches above the bottom of the drilled total depth of the boring. The location of the deep probes ranged from 8.25 to 15.25 feet bgs as summarized in Table 1 (below). The soil boring logs with probe construction details are included in Attachment A. Table 1: Soil Gas Probe Construction Details Date Probe Boring Depth of Shallow Depth of Deep Probe ID Constructed Total Depth Probe Tip Probe Tip (feet bgs) (feet bgs) (feet bgs) PRSG-1 1/28/15 9.5 5.25 9.25 PRSG-2 1/28/15 8.5 5.25 8.25 PRSG-3 1/29/15 15.5 5.25 15.25 PRSG-4 1/30/15 14.5 5.25 14.25 PRSG-5 1/30/15 14.5 7.25 14.25 PRSG-6 1/30/15 15.5 5.25 15.25 PRSG-7 1/27/15 8.5 5.25 8.25 PRSG-8 1/27/15 8.5 5.25 8.25 Note: feet bgs =feet below ground surface TERRA PACIFIC GROUP Page 2