SITE INFORMATION AND CORRESPONDENCE

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Former Beacon StatiAo. 3641 February 12, 2013 Stockton California Well Destruction Report Well Destruction Fieldwork Horizon witnessed AWA conduct well destruction fieldwork from January 28 to February 1, 2013. Inspector Mr. Johnny Yoakum observed well destruction operations on behalf of the EHD. The following wells were destroyed by the pressure grouting method: triple- completion well MWANW-112, double-completion wells VW-314, VW-516, VW-718, and single-completion wells SW-1, MW-5, MW-6, MW-7, MW-9 and MW-I 1. Wells MW-2, MW-3, MW-4, MW-10, MW-12, MW-13 and MW-14 were destroyed by over-drilling to total depth of the well and backfilling the bore hole with neat cement. The calculated volumes of grout required to fill the bore holes, and the actual emplaced grout volumes are summarized in the enclosed table. In the pressure grouting method, neat cement was pumped into the well casings via tremie set within three feet of the total depth of the well casings. For wells within the UST basin, the grout level was brought to the top of well casing. For the other wells, the grout level was brought to within 5 feet of the surface. The casings were then air pressurized to 25 pounds per square inch for approximate 10 minutes and the grout was topped off until stabilized. For wells outside the UST basin, the top 3 feet of the well materials were drilled out with the same size auger as the original borehole. The bore hole was then enlarged to approximately one foot greater than the initial borehole to expose approximately 6 inches of the casing. Neat cement grout was emplaced in the exposed casing and bore hole to a depth of approximately 1 foot. The calculated volumes of grout required to fill the wells, and the actual emplaced grout volumes are summarized in the enclosed table. With the exception of the wells destroyed in the existing UST basin area, well boxes were removed and the immediate surrounding surface was restored to match pre-existing conditions. The upper foot of former wells located in landscaped areas were backfilled with soil and landscape material. Contact Horizon at 916-939-2170 if you have any questions or require additional information. Sincerely, � I_ � �- HORIZON NVIRONMENTAL INC. ;"� � LQ) .w S Rexford Smith, P.G. No. 5307 Project Manager s Enclosures C K%��(� c: Mr. Tom Sexton, Ultramar Inc. WellDestrUaRpt Feb 13.doc Project No. 1540,17 2 HORIZON ENVIRONMENTAL INC.