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f - <br /> N4W • 4 iii V 1 %4 l i %A U J6.,4004 <br /> CRLIFORNIR REGIONRL WRTER QUALITY CONTROL BORRO * CENTRRL URLLEY REGION <br /> 3443 Routier Road <br /> Swranvoto,California 95827-3098 pbOne' (916) 361-5600 <br /> - RTSS: B-495-5600 <br /> TO: Ton Vorsterll. FROM: Gordon Lee Boggs <br /> (L . <br /> (Laurie COt'�a Underground Tank <br /> Diane. ff ns&iY Program Coordinator <br /> Dave CarIs, MM) <br /> DATE: 22 June 1988 SIGMATURE: <br /> SUBJECT: COMMENTS ON WORKpLANS FOR SAFEWAY, ilii NAVY DR-, <br /> STOMON; 'ROBERTS OIL, LODI{- ,TRI VALLEY GROWERS, <br /> THORNTON; SOUTHLAND (7-if1 `".GRANTLINE, TRACY; UNOCAL, <br /> i <br /> 4707 PACIFIC AVE., STOCKTON; AND GENOVA BAKERY,STOCKTOM <br /> Sdfewey, Mi i i Nav Drive Stockton <br /> Joe Theissen of Weiss Associates called on 20 June 1988 about the <br /> monitor well placement and soil excavation need in order to leave the <br /> Underground Tank (UT) concrete cradle in place. Because MW 3 and <br /> Boring 2 show that the area is interspersed with sand layers, it is not <br /> easy to determine the movement of the diesel at the site. We also <br /> decided that to put MW 4 on the downgradient side of the cradle would <br /> duplicate what they have now and would be too far away for a point <br /> Of compliance. Therefore, Weiss will submit an amended workplan <br /> that will place MW 4 closer to the source of contamination and better <br /> define how the excavation of the site will take place. Baring 2 showed <br /> contamination at 20.7 feet which is three feet below the current water <br /> level. They also must explain that and determine how the excavation <br /> will accomodate the removal of the contaminated soil above and below <br /> the water table. The placement and rationale for MW 4 is to be <br /> included. <br /> RobertsM 112i, <br /> Kent Parish of Ensco (formerly Exceltech) called on 21 June to discuss <br /> their proposal to begin work at the Roberts Oil site. The last work was <br /> done in 1985 by Kleinfelder Associates. Arter talking to Laurie Cotuila <br /> later in the day, we both were unaware that Ensco had begun work <br /> about a month ago. Kent is to prepare a workplan according to the <br /> Regional Board reporting po g guidelines. Copies of the new guidelines and <br /> the 1, 2,5 investigation recommendations also were sent to Kent. <br />