SITE INFORMATION AND CORRESPONDENCE_FILE 2

Home Browse Search

_ San Joaquin County Environmental Health Department DIRECTOR Donna Heran,REHS r. z 1868 East Hazelton Avenue PROGRAM COORDINATORS �. I _�• ; ' { Stockton, California 95205-6232 Robert McClellon,REHS Jeff Carruesco,RENS,RDI Kase Foley,RENS Cq' �P Website: www.sjgov.org/ehd y y' C�F o Rea Linda Turkatte, REHS Phone: (209) 468-3420 Rodney Estrada, REHS Fax: (209) 464-0138 Adrienne Ellsaesser,REHS October 24, 2014 Amerco Real Estate Company Amerco Real Estate Company Attention: Mr. Larry Hine PO Box 29046 2727 North Central Avenue, Suite 500 Phoenix, Arizona 85038 Phoenix, Arizona 85004 Subject: U-Haul Facility No. 70950 2701 North Wilson Way Stockton, CA 95215 The San Joaquin County Environmental Health Department (EHD) has received and reviewed Well Destruction Work Plan (WP), dated 2 October 2014, prepared and submitted by your consulting firm, Cardno ATC Consultants Inc., on your behalf for the above-referenced site. In the WP, ATC proposed destruction of a total of 72 wells. The EHD approves the WP methods and procedures for the destruction of the 72 wells, with the follows conditions: • Vapor Extraction Monitoring Wells VE-2 and VE-3, may be destroyed through pressure grout destruction methods. This destruction method includes the excavation and removal of the well box from the well. The excavation around the well casing, after the well box has been removed, shall be at least one foot larger in diameter than the originally drilled hole to a depth of 3 feet below surface grade. The well casing shall then be cut off and removed 6 inches above the bottom of the excavation. Neat cement shall be pumped to the bottom of the well through a trimie tube up to the surface, and then air pressure of 25 PSI applied for 10 minutes. The neat cement shall spill out of the top of the well casing and form a "mushroom cap" seal with at least one foot of neat cement grout poured 6 inches above and 6 inches below the top of the cut-off casing. All water used for the purpose of sealing a well shall be clean potable water. Water displaced from the well(s) being destroyed may not be used in the grout mixture. • Monitoring wells MW-1 through MW-14; nested Vapor Extraction Wells VE-1; VW-4 through VE-6; and Air Sparge wells AS-1 through AS-32 shall be destroyed by complete removal of the well through over drilling destruction methods. This includes the removal of the well casing, filter pack, annular seals, and other well contents frorn the borehole. The resulting bore hole shall be filled with neat cement pumped to the bottom of the bore hole through a trimie tube up to three feet below the Surface. • The nested monitoring well, VE-1, shall be over drilled using an auger larger in diameter than the original borehole. Successful removal of all contents of a nested well has been achieved by centering the augur on the deepest cased well. The diameter of the augur used was large enough to capture and remove all of the wells and the well contents in one downward pass.