SITE INFORMATION AND CORRESPONDENCE_FILE 2

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0 0 Case Closure Activities— Eligible for Closure April 30, 2015 Gillies Trucking Page 2 of 3 3931 Newton Road Stockton, CA 95205 either be pressure grouted or over-drilled: GT-12A, GT-13A, GT-13B, GT-14A, GT-19, GT-30, GT-31, and GT-33. The other 20 monitoring wells and 6 soil vapor extraction (SVE) wells must be over-drilled. Pending properly addressing comments or concerns received by the EHD during the 60-day comment period, and after obtaining an EHD well destruction permit, you may proceed to destroy all of the monitoring wells and SVE wells that were installed as part of the investigation at the subject site with the following conditions: • Wells to be over-drilled shall be destroyed by removing all material within the original borehole (including the well casing, screen, filter pack, annular seal, and conductor casing); • Augers used to over-drill the wells shall be of the same size diameter or larger than the augers used to install the wells; • The cleared boreholes are then to be sealed with neat portland cement (grout) from the bottom upward, through a tremie pipe or equivalent which extends to within 5 feet of total depth, to the depth of 3 to 5 feet below surface grade; • Mix grout at a ratio of 5 to 6 gallons of clean, potable water per 94 pounds of grout; • Regarding wells proposed to be destroyed by pressure grouting, enlarge the diameter of the top 3 feet of the borehole at least one foot larger than the auger originally utilized to install the well; after the grout mixture has completely filled the casing, apply at least 25 psi pressure on the grout for ten minutes (destroy the well by over-drilling if the well casing is unable to withstand this pressure for this length of time); cut off and remove the casing 6 inches above the bottom of the excavation before inserting grout into the excavation to create a "cap" with a vertical thickness of one foot; this "cap" must be installed in one continuous pour immediately after the well has been destroyed; • All investigation-derived wastes (IDW), including soil cuttings, debris, and groundwater generated from soil borings and well installations, shall be containerized for proper disposal and the containers labeled to characterize the waste: hazards, composition, generation site address, generator's name, and date of accumulation; and • A well destruction report describing well destruction field activities and including the receiving facility-signed manifests for the disposed IDW must be submitted to EHD. For issuance of a well destruction permit, the following must be submitted to the EHD to the attention of Gabriel Gonzalez: • Table including updated planned destruction method, total depth and auger diameter for all wells to be destroyed; • EHD Well and Boring Permit Application form; • Master File Record form; • Licensed Contractor's Declaration (LCD); and • A fee of $650 (5 x $130). Additional inspection time spent beyond the initial pre-paid fee will be at the current hourly rate of$130. The EHD will contact your consultant when the permit is issued. After permit issuance, the EHD requires well inspections to be scheduled with Johnny Yoakum, REHS, at least 5 workdays prior