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Addendum to Soil Problem Assessment ReporttWork Plan Franzia Brothers Winery 1700 East Highway 120, Ripon, CA April 9, 1992 W0190 excavation indicated nondetectable levels of gasoline hydrocarbons On September 11, 1990, one monitoring well (MW-1) was installed at the site in the area where the highest hydrocarbon contamination was detected during the soil excavation Although the first quarterly monitoring event showed low levels of xylenes present in the groundwater sample collected from well MW-1, subsequent quarters have shown nondetectable levels of all analytes Groundwater beneath the site flows generally north-northeasterly Field activities performed during the initial investigation at the site are discussed in detail in correspondence from WaterWork Corp to the SJCPHS dated November 13, 1990 PROPOSED WORK RESNA industries will perform the following work at the site to further define the lateral extent of groundwater contamination Field Activities Task 1. Installation of Additional Groundwater Monitoring Wells Two soil borings will be advanced in the downgradient groundwater direction of the former tank excavation at the protect site (Figure 2) The borings will be drilled to a total depth of approximately 65 feet below grade, 15 feet beyond the first occurrence of groundwater, or to auger refusal, whichever occurs first _Soilsamples will be collected at-five-foot-iiitefvals=and ,,will-be-described and logged-continuously according-to--the_Unified-Soil_ClassificationLLSystem :r Soil samples-collected at-tlie=water table-interface--will-be analyzed-by-a-state certified-laboratory-- The drill cuttings will be stockpiled on site, covered and underlain by 6 mil plastic pending results of laboratory analysis The two borings will be completed as groundwater monitoring wells using 2-inch PVC screen and casing Figure 3 depicts the proposed well construction detail Task 2. Well Development and Sampling The top of the well heads will surveyed and the depths to water will be measured in each well to evaluate the direction and magnitude of the groundwater gradient beneath the site The new wells will be developed and sampled to evaluated the extent of gasoline hydrocarbon impaction in the first-encountered groundwater at the site Purge water from the monitoring wells will be contained in 55 gallon drums pending laboratory analysis L040792 SAY 2