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Ms. Amy Terrell <br /> California Re ional WaterQuality Control Board <br /> 1 12 May 2D10 <br /> Page 2 <br /> on-site on 6 April to observe destruction activities. On 5 April, WWT excavated around the well casing to <br /> a depth of approximately 4.5 feet, stockpiled the excavated soil next to the excavation, and cut the <br /> casing off 6 inches above the base of the excavation. On 6 April, WWT placed 2-inch diameter PVC <br /> tremie pipe down to approximately 82 feet bgs. Detonating cord was placed in the hole to 83 feet bgs <br /> with booster charges placed every 10 feet starting at 20 feet bgs. Prior to detonation of charges, a <br /> 10.3 sack mix(188-lbs sand to 94-lbs Type I or II Portland cement and 7-gallons water) sand-cement <br /> was pumped down the tremie pipe, filling the well to the top. Water displaced during grouting was <br /> placed in a drum onsite. <br /> t <br /> After the charges were detonated, the grout slurry dropped approximately 10 feet. The well was then <br /> filled with grout to 6-inches above the top of the well casing, and the grout was allowed to set overnight. <br /> On 7 April, WWT backfilled the 4.5-foot.deep excavation with stockpiled.so 11 that was previously <br /> excavated from around the well casing. <br /> Wastes were left on-site-as requested by Ripon Farm Services personnel. <br /> T&R will submit a Well Completion Report to the-State of California Department of Water Resources, and <br /> SJCEH. <br /> If you have questions regarding the contents of this report, please contact Jeremy Gekov at <br /> i (510) 874-4500, ext 527 or Patrick Hubbard at(925) 381-5381. <br /> Sincerely yours, G 'i <br /> I TREADWELL&ROLLO, INC. y�\ONAL �O`�C�s <br /> � �pptRlG'�9R1 <br /> Jeremy C. Gekov iabbard PG <br /> Senior Staff Geologist Principal Geologist_ <br /> �. <br /> 48430103.OAK <br /> Enclosures: Figure 1—Site Location Map <br /> Figure 2—Site Plan <br /> Attachment—Well Destruction Permit <br /> cc: Mr. Bud Den Ouden, Ripon Farm Services LLC <br /> Ms. Adrienne Ellsaesser, SJCEH <br />