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F ,1, rDDENDUM SITE ASSESSMENT REPORT FORMER ISC WINERY SITE 1 WEST TURNER ROAD, LODI, CA INTRODUCTION On February 1, 1990, the report "Site Assessment Report Update and Work Status, Former IGC Winery Site, 1 Kest Turner- Rd. , Lodi, CA" was submitted to the Department of Health Services with an extra copy for the Regional Water Quality Control Board. Certain work was proposed in order to complete the assessment of possible aqui.er infiltration and to establish if possible the piezometric surface of the groundwater. This addendum to that report should complete those tasks and finalize site assessment, but it is not intended to undertake remediation which is still under con- sideration by Jim Thorpe Oil , Inc. ACTIVITY There are three mcnitcring wells on site, which were used for both water sample testing and in establishing the piezo- metric surface in a previous report documented in the main body of the ISC Winery Report to which this is an addendum. These wells had all been sheared by earth moving equipment and new elevations run on the stubs. In order to protect the wells from vandals, the well tops had been cut off and Ot. lockable steel caps installed. Because accurate measurements of the well tops were not kept, re--surveying is again necessary. All measurements of water and bottom levels will be made from the top of casing (too) . purge On March 22, 1990 an attempt was made to p e the three g wells and to bail them clean (develop them by bailing) . Persons present were: Richard Thorpe, Jim Thorpe Oil , Inc. ; Dennis Allen and Bill Hunter, Consultants; Darlene Reuss and Greg Lyon, DHS; and Andy Bakinow5ki and Laura Valley, Groundwater Technology, Inc. , who supplied an electric water level detector and a 1" ID bailer. A water supply truck con- taining City of Lodi municipal water, connecting hoses and pvc pipe for purging the wells was also on site, Samples of the water in the truck were taken by P,ichard Thorpe in containers supplied by Canonie Labs. Well No. i, the westerly well , was entered first. Fill was found at about 36' toc. The wash pipe was placed in the well to the point of fill and water was introduced by gravity. Immediate returns of muddy water and silt were obtained. The well was washed for about to minutes with relatively clean water obtained at the end. Owing to the water trucl: set up, no estimate of water introduced into any of the wells was _obtained.- An--attempt was- made._.to_.bai..l ...this-well—but gsa_i_ng _...._ _.__-.