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JUL <br /> Wright � <br /> Environmental <br /> Services, Inc. <br /> Construction • Engineering • Remediati69'9 JIJL 7 Pjy <br /> July 7, 2000 <br /> City of Tracy <br /> 520 Tracy Boulevard <br /> Tracy, CA 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Quarterly Monitoring Approach <br /> Tracy Auto Stereo Site,10 West Grantline Road, Tracy, CA <br /> PHS EHD Site Code 504834 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) has prepared this addendum letter for the <br /> above referenced site. As you know, Wright has performed a soil and groundwater <br /> sampling preliminary site assessment in our report dated April 21; 2000. The San <br /> Joaquin County Public Health Service Environmental Health Division (PHS EHD) has <br /> reviewed the report and is in general agreement with the recommended work. However. <br /> the PHS EHD desired the following clarification regarding quarterly groundwater <br /> monitoring of the proposed monitoring well in their telephone conversation of June 22, <br /> 2000. The following approach to groundwater monitoring will supplement and amend <br /> our proposed workplan dated June 9, 2000. <br /> Approach to Groundwater Monitoring <br /> Wright will perform the following work: <br /> 1. One groundwater monitoring well will be installed at street location next to <br /> exploratory boring B-3. This well will be sampled at quarterly intervals for Total <br /> Petroleum Hydrocarbons as Gasoline (TPHG), Benzene; Toluene, Ethylbenzene and <br /> Xylenes (BTEX), and Methyl-tert-butyl-ether (MTBE) and fuel oxygenates, as well as <br /> Ethylene Dibromide (EDB) and 1,2-DiChloroethane (1,2-DCA). <br /> 2. PHS EHD suggested reviewing the two downgradient sites on the corner of Holly <br /> Street and Grantline Road to assist in ascertaining groundwater flow directions. Wright <br /> will review the files as listed by PHS EHD at 2421 Holly Street (an inactive service <br /> station) and 15 Grantline Road (an active service station). Wright will review these files <br /> to gather information regarding well details, subsurface lithology and elevation datum of <br /> well casings on both sites. If necessary, Wright will request permission to enter these <br /> sites for the purpose of resurveying well casings so the new well will have the same <br /> datum for groundwater measurements and flow contouring. <br /> 67 E. 10th Street • Tracy, CA 95376 <br /> 209.833.0758 . Fax 209.8325152 <br /> wright(.@inreach.com Lic. #6.11501 A-B HazMat Page 1 ice, <br /> websit http://home.inreach.com/wright <br />