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CLEARWATE'A <br /> C-, R O U P, I N C_ <br /> Enveranmrnta! Scrvcce5 <br /> December 23, 1997 <br /> Mr Harlan]Knoll <br /> San Joagrun Counter -IPHSIEHD <br /> ]PO Box 388 <br /> Stockton,CA. 95201-0389 <br /> Re Boetmher-Western properties-4555 Pershing Ave,Stockton,CA <br /> Well Abandonment Work-Request for Final Closure Documentation <br /> MDear Mr. Knoll, <br /> As per your recent conversation with Kelly 5tradinger of Boettchez-Western properties, Clearwater <br /> was authorized to implement the well abandonment at the above referenced facility. On December 19, <br /> 1997 Clearwater and their subcontractor N itchell Drilling Envrromacutal(MDE),a licensed California <br /> drilling contractor,performed the mo7attorrng well and vapor extraction well Abandonment at the site <br /> Thus letter docuwtrots the well destruction activities. <br /> A total of 219 feet of vertical piping was abandoned aging Basalrte,a neat cement The ceinent was <br /> mixed m accordance with the manufacturers specifications with a 1.101 ratio of Bas alite,to water.The <br /> momtonng wells (MW-1, lti/ifW-2, MW-3, MW-4 & MW-5) and vapor extraction well (VW-1), as <br /> shown m Figure 1,were abandoned in place using pressure grouting axed over-drill g methods The <br /> wells were granted using between 80 - 90 pounds per square inch (PSI) of pressure. The first five <br /> feet of each well was over-drilled using a modified hit to remove the road boxes and rings arca the first <br /> five feet of vertical piping The void was filled with the cement mix and finished to grade with <br /> concrete The amount of grout required to Ertl the wells is mown on'fable 1, <br /> As I mentioned to you daring our telephone conversation of 12117/97 one drum of purge water <br /> 0 remained At the site The representative water sample results from the most recent groundwater <br /> sampling event were non-detect for all parameters analyzed, mcludrng B'I'M TPHgas, and MTBE <br /> 52{7 Third 5kxeet,Suite 104 O.�ldand,Ca1darn a 9�kb(}7 a Telephone 510-893-51(4) et Fax 510-891-5947 <br /> STs d dIONO 63113M UZID Wd8G ZT 2-6, EE 03Q <br />