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05/20/2004 15:06 2094r* '.18 AGE STOCKTON PAGE 02/0 <br /> Advanced <br /> GeoEnvironmental Inc - <br /> 20 May 2004 <br /> AGE-NC project No. 02-0886 <br /> Ms. Vicki McCartney <br /> San.Joaquin County Environmental Health Department <br /> 343 East Weber, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Addendum to Revised Monitoring Well Installation Work Ilan <br /> Former BLUE STAR GASOLINE <br /> 4040 Fast Main Street, Stockton, California <br /> Dear. Ms. McCartney: <br /> At the request of Mr. Khalid Anber,property owner,Advanced GeoEnvironmental,Inc. (AGE)has <br /> Prepared this Addendum to Revised Monitoring Well Installation Work Plan for the,property located <br /> at 4040 East Main Street, Stockton,California. This addendum addresses concerns and comments <br /> in the San Joaquin County Environmental Health Department(SJCEHD)letter dated 15 April 2004, . <br /> regarding the specific scope of work presented in the Work Plan. <br /> The following comments are submitted for your consideration: <br /> • AGE will install all three proposed monitoring wells during a single mobilization: <br /> 0 One monitoring well pilot boring, near the former underground storage tank area, will be <br /> continuously cored for lithological evaluation. <br /> • Laboratory results shall include all quality assurance/quality nco. ntrol CQZ/ C)Paramaters <br /> , <br /> as appropriate and typical for UST investigation sites. <br /> • Standard reporting limits for 1,2-DCA and EDB shall be 0.5 micrograms per liter, unless <br /> interference is encountered from* other constituents (which could results in increased <br /> reporting limits in selected samples), <br /> • As indicated in the Work Plan, a site specific,health and safety planwill be provided to the <br /> SJCEHD prior to field activities. <br /> 837 Shaw Road,5cockton,C AFornia 95215 <br /> Tolephonc(209)46.7-1006 PAX(209)467-1118 <br />