Laserfiche WebLink
, Y <br /> LEE & PIERCE inc. <br /> consulting Engineers <br /> 3800 McHENRY AVENUE, SUITE I <br /> MODESTO, CA 95356-1569 <br /> BILL PELICH,P.E.CIVIL PHONE(209)527-1247 <br /> JOHN LANE,P.G.,R.E.A. FAX(209)527-4810 <br /> LEE MARCUM SALINAS(831)758-0098 <br /> July 24,2007 <br /> Mr. Harlin Knoll c% <br /> San Joaquin County Public Health Services <br /> Environmental Health Division J 1� <br /> 600 E. Main Street JUL 2 ,5 2001 <br /> Stockton, CA 95202-3029 ENiIRO <br /> PERpv,�Vj.IF;"S1VI��J rH <br /> Subject: Workplan for Abandonment of Groundwater Monitoring Wells <br /> Beneto Inc., 18042 S. Harlan Road, French Camp, California(Figure 1) <br /> Dear Mr.Knoll: <br /> As we discussed Lee & Pierce, Inc. (L&P) is submitting this workplan on behalf of Beneto Inc. <br /> to abandon groundwater monitoring wells at the subject site. Pursuant to your letter dated July 2, <br /> 2007, L&P will destroy wells MW-1, MW-2, and MW-3 by pressure grouting. Monitoring well <br /> locations are shown on Figure 2. Copies of well logs are included in Attachment A. <br /> V&W Drilling (C57 License #720904) will destroy groundwater monitoring wells under the <br /> supervision of a Lee & Pierce geologist. The wells will be destroyed by pressure grouting with <br /> neat cement. Neat cement grout will be pumped into each well in turn through a tremie pipe <br /> system in one continuous operation until the well is completely full. Additional cement will then <br /> be added under pressure to force the grout through the well screen and into the filterpack, and <br /> subsequently checked for subsidence. If the grout level is observed to have dropped, additional <br /> cement will be added under pressure until it stabilizes. Upon stabilization, the well box and and <br /> surrounding soil will be removed to a depth of at least 3 feet by overdrilling with a 24-inch <br /> diameter auger. The well casing will then be cut off approximately 6 inches above the bottom of <br /> the excavation. Neat cement grout will be allowed to spill over the well casing and fill the void <br /> to at least 6 inches above the cut casing. After the sealing materials have sufficiently set, the <br /> excavation will be backfilled with clean, native soil. The unused soil and well debris will be <br /> placed in a DOT approved 55-gallon drum or an on-site bin for disposal to a landfill. <br /> Based upon well construction details, we expect a minimum of 6 gallons of neat cement grout <br /> will be required for each well. <br /> C:Vobs\Bawto\Fmnch Camp\WELLDST_wmkplmdoc <br />