SITE INFORMATION AND CORRESPONDENCE

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�y • I I G 111 U (- a (i (I U f(ivoo CRLIFORNIR REGIONRL WRTER OURLITY CONTROL BURRO CENTRRL URLLEY REGION 3443 Routier Road Phone: (916) 361-5600 Sacramento,California 95827-3096 ATSS: 8-495-5600 TO: Ton Vorster 1014: Gordon Lee 13oggs (Laurie CotuIla F Underground Tank 'Dfarie`Hinsanti° Program Coordinator Dave�Carls, &nM) DATE: 22 June 1988 SIGNATURE: SUBJECT: COM 4MEMS ON WORKPLANS FOR SAFEWAY, 1111 NAVY DR. , STOMON; ROBERTS OIL, LODI; TRI VALLEY GROWERS, THORNTON; SOUTHLAND (7-11), GRANTLINE, TRACY; UNOCAL, i 4707 PACIFIC AVE., STOCKTON; AND GENOVA BAKERY,STOCKTON- Safewa iiit Nav i Drive Stockton Joe Theisen of Weiss Associates called on 20 June 1988 about the monitor well placement and soil excavation need in order to leave the Underground Tank (UT) concrete cradle in place. Because MW 3 and Boring 2 show that the area is interspersed with sand layers, it is not easy to determine the movement of the diesel at the site. We also decided that to put MW 4 on the downgradient side of the cradle would duplicate what they have now and would be too far away for a point Of compliance. Therefore, Weiss will submit an amended workplan that will place MW 4 closer to the source of contamination and better define how the excavation of the site will take place. Boring 2 showed contamination at 20.7 feet which is three feet below the current water level. They also must explain that and determine how the excavation Will accomodate the removal of the contaminated soil above and below the water table. The placement and rationale for MW 4 is to be included. Ro rtLOil Odl Kent Parish of Ensco (formerly Exceltech) called on 21 June to discuss their proposal to begin work at the Roberts Oil site. The last work was done in 3985 by Kleinfelder Associates. Arter talking to Laurie C.otulla later in the day, we both were unaware that Ensco had begun work about a month ago. Kent is to prepare a workplan according to the Regional Board reporting guidelines. Copies of the new guidelines and the 1,2,5 investigation recommendations also were sent to Kent.