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I. <br /> r <br /> q'r <br /> ' <br /> DADAMES <br /> ��( �w �//�(� �}�i 7 <br /> A11ES & 4� GORE ,iiri!il,.l •}.s. lltll i!fE'A}t[f-111 y11[I' rI 'e_ <br /> IQ11 FINNI 'If IAW AIII wla:, St 1: A, 'R SNO. Armok1 IAIAX 41171 :}' <br /> July 10, 1990 <br /> Chevron USA Project No. 16000-206-044 <br /> PO Box 5004 <br /> San Ramon, CA 94583--0304 <br /> Attention: John Randall <br /> Res Well Head Reconstruction <br /> Chevron station No. 9--6465 <br /> 5068 N. Pershing <br /> Stockton, California <br /> Dear Mr. Randall, <br /> In accordance with your request, Dames & Moore has <br /> completed the reconstruction of seven groundwater monitoring <br /> well heads at the Chevron Station No. 9-6465 located at 5068 <br /> N. Pershing, The well locations are noted on the attached <br /> Plate I. The following report presents the methodology <br /> employed by Dames & Moore to reconstruct the well heads. <br /> PROJECT HISTORY <br /> The existing groundwater monitoring wells were installed <br /> between 1986 and 1988 and were intended primarily for the <br /> monitoring of groundwater depths and quality. It is Dames & <br /> Moore's suspicion that the existing well heads can not seal <br /> properly and could allow infiltration of foreign substances <br /> into the well. <br /> A verbal notification of the well reconstructions was <br /> given to the San Joaquin County Department of Health. Upon <br /> verbal approval of the proposed work by the County Health <br /> Department, West Hazmat Drilling was contacted to schedule' <br /> the well head reconstruction. The well head reconstructions <br /> took place on June 21 and 22, 1990. <br /> TECHNICAL APPROACH <br /> A Dames & Moore engineer. was present during the well <br /> head reconstruction to record observations and to document <br /> the recunstruction (Plates 2, 3, and 4) . <br /> Prior to reconstruction, each well casing was checked <br /> for any obstructions and evidence of foreign material. <br /> •AI Il n u-r KI Iia-;UI. <br />