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SIERRA <br /> January 6, 1992 tnuronm°nal 5ertifces <br /> Clint Rogers <br /> Chevron USA <br /> P O Box 5004 <br /> San Ramon CA 94583 <br /> Re Chevron Service Station #9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SES Project #1-146-04 <br /> Dear Mr Rogers <br /> This report presents the results of the quarterly ground water sampling at Chevron Service <br /> Station #9-6171, located at 6633 Pacific Avenue in Stockton. California (Figure 1, Appendix A) <br /> Four wells, MW-2 through MW-5,were sampled (Figure 2,AppendixA) One well, MW-1, was dry <br /> On December 6, 1991, SES personnel visited the site Water level measurements were <br /> collected in all site wells and all wells were checked for the presence of free-phase hydrocarbons <br /> Free-phase hydrocarbons were not present in any of the site wells Water level data are shown <br /> in Table 1 (Appendix B) and a ground water elevation contour map is included as Figure 2 <br /> (Appendix A) <br /> 'I he water samples were collected on December 6, 1991 in accordance with SES Standard <br /> Operating Procedure - Ground Water Sampling (Appendix C) All analyses were performed by <br /> Superior Precision Analytical Inc of Martinez, California Analytic results for ground water are <br /> presented in Tables 2 and 3 (Appendix B) The chain of custody document and laboratory analytic <br /> reports are included in Appendix D SES is not responsible for laboratory omissions or errors <br /> Thank you for allowing us to provide services to Chevron Please call if you have any <br /> questions <br /> Sincerely, <br /> Sierra Environmental Services <br /> (b4y <br /> Chris J Bramer <br /> Senior Project Engineer <br /> doge reens elder ~~� <br /> Registered Geologist #00301} <br /> CJB/RG/ly <br /> 14604QM DEI ' <br /> Appendices A - Figures <br /> B - Tables �i4 c ae�s <br /> C - SES Standard Operating Procedure <br /> D - Chain of Custody Document and Laboratory Analytic Reports `.�'` OF ,�Q,�-`' <br /> Cly <br /> PO Box 2546 Martinez Califoi ma 94553 (510) 370 - 1280 <br />