FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

i Abdelwahed Facility December 31, 2013 Stockton California Well Destruction Report Well Destruction Fieldwork Horizon witnessed Penecore conduct well destruction fieldwork during the period from October 22 to November 4, 2013. Inspector Mr. John Yoakum of EHD observed daily well destruction operations. The following wells were destroyed by the pressure grouting method: monitoring wells MW-4, MW-7 and MW-8. The following wells were destroyed by the over-drilling method: MW-2, MW-3, MW-6, MW-9 through MW-13, sparge wells SW- 1, SW-2 and vapor extraction wells VW-I through VW-5. Pr onto destruction activity, measurements indicated that the total depth in each well casing was within 14% of the total installed depth. In the pressure grouting method, neat cement grout was pumped into the well casings via tremie set to within three feet of the total measured depth of the wells. The grout level was brought to the top of well casing and was topped off until stabilized. The well materials were drilled to a depth of approximately 3 feet to a diameter of approximately one foot larger than the original borehole. The bore hole was deepened to expose approximately 6 inches of the casing. Neat cement grout was emplaced in the bore hole to within I foot of the surface. In the over-drilling method, well construction materials were drilled out to the diameter of the original borehole and the total-installed depth of the well. Neat cement grout was emplaced in the bore hole to within 3 feet of the surface as the auger string was extracted and topped off until stabilized. Approximately t/2 foot of bentonite was emplaced over the grout to create a base for the backfill material. Sand backfill was placed to within one foot of the ground surface. At well VW-4, the advancing steel guide leading auger was lost in the bore hole at approximately 15 feet below surface grade; the remaining 10 feet of well material was not drilled out. Approval of the shorter over-drill of well VW-4 was issued in the field on 1 j November 2013. All well vaults were removed and bore holes were backfilled to flush with the surrounding surface. The calculated volumes of grout required to destroy the wells and the actual emplaced grout volumes are summarized in the enclosed Table 1. Solid well destruction materials and soil cuttings were contained in a roll-off bin, and equipment rinse water was contained in DOT-approved, 55-gallon drums for temporary on- Site storage. On 19 November_2013, Belshire removed the non-hazardous solid waste from i the Site. On 21 November the solid waste was disposed to Forward Landfill (Class II) in Manteca, California. Horizon transported and disposed the non-hazardous liquid waste to InStrat in Rio Vista, California on 28 October and 9 December 2013. Copies of the non- i hazardous waste manifests are enclosed. Penecore documented the destruction of each well via a Department of Water Resources (DWR) form 188 Well Completion Report. Horizon submitted the DWR reports to the North Central Regional district office. i WellDestructRpt Dec 13.doc Project No. 1792.04 2 HORIZON ENVIRONMENTAL INC.