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FW : Encroachment Permit Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From : David Dixon [dgdixon@treadwellrollo.com] <br /> Sent: Thursday, November 11 , 2004 5: 07 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Dustyne Sutherland ; jay. coffey@ci. stockton .ca. us <br /> Subject: Changes to workplan <br /> Vicki, <br /> This e-mail describes changes planned to the work described in our 4 November 2004 soil and <br /> groundwater investigation workplan for the Former County Motor Pool Site at 130 North Hunter Street <br /> in Stockton. The changes are being made to address recommendations in your 9 November 2004 <br /> conditional approval letter for our Workplan. We propose the following changes: <br /> a Soil borings SB-4 and SB-5 will be advanced to 60 feet below ground surface (bgs). The limited <br /> clearance direct push rig proposed for use should be able to achieve this depth. <br /> . Two groundwater samples will be collected from borings SB-4 and SB-5 ; one at first encountered <br /> groundwater at approximately 30-feet bgs, and the second at approximately 55-feet bgs. <br /> . Soil samples will be collected in borings SB-4 and SB-5 for laboratory analyses. Continuous soil <br /> cores will be collected from these borings for logging purposes, and from 20 to 60 feet bgs soil <br /> samples will be retained every five feet or at lithologic changes for possible laboratory analyses. <br /> . Soil borings SB-4 and SB-5 will be moved approximately 10-feet further from the source area <br /> than shown in Figure 2 of the Workplan. <br /> . In order to add all of the analytes recommended for groundwater, EPA method 8260B will be <br /> used to analyze for TPH as gasoline, BTEX, fuel oxygenates, 1,2-DCA, EDB, and ethanol and <br /> methanol. Additionally, EPA Method 8015M will be used to TPH as kerosene. <br /> . Soil analyses will include EPA Method 8015M for TPH as kerosene and TPH as gasoline, and <br /> BTEX compounds will be analyses by EPA Method 8021 . EPA Method 6010B will be used for <br /> soil samples collected in the test pits. <br /> o The borings SB- 1 , SB-2 and SB-3 will be completed at another date after results are known from <br /> borings SB-4 and SB-5, and after additional utility clearances determine if the locations proposed <br /> in the workplan can be moved further into the street. <br /> Please call with any questions, <br /> David G. Dixon, RG <br /> Senior Project Manager <br /> Treadwell & Rollo <br /> 555 Montgomery Street, Suite 1300 <br /> San Francisco, California 94111 <br /> Phone 415 955-9040 <br /> Fax 415 955-9041 <br /> e-mail dgdixon@treadwellrollo.com «m into:dgdixon_ @trcadwcllrollo.com>> <br /> This information is intended solely for use by the individual or entity named as the recipient hereof and may be an attorney work product that is <br /> privileged and confidential or it may contain confidential company information. If you are not the intended recipient, be aware that any disclosure, <br /> copying, distribution, or use of the contents of this <br /> transmission is prohibited. If you have received this communication in error, please notify us immediately by return e-mail or by e-mail to <br /> info@treadwellrollo.com, and destroy this communication and all copies thereof, including attachments. <br /> 11 /12/2004 <br />