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• • <br /> CRYSTAL CREAMERY - STOCKTON <br /> • WKA No 1628 01 <br /> March 17, 1994 <br /> Page 5 <br /> western border along Van Buren Street The contamination along Van Buren Street is a concern <br /> due to the high levels of gasoline contamination detected in ground water samples from the three <br /> monitoring wells located there, and the proximity of the contamination to the Crystal Creamery <br /> property One of the three wells is reported by RESNA in their April 16, 1992 Quarterly <br /> Report, to have over 11/7. feet of floating hydrocarbons on the water The RESNA quarterly <br /> report also indicated ground water flow direction beneath the western portion of the property was <br /> to the north with a gradient of 0 003 ft/ft <br /> A subsurface investigation has been completed on the property immediately south of the Crystal <br /> site by RESNA for the City of Stockton This property was previously used by Western Pacific <br /> Railroad (WPRR) as a loading/unloading and storage area for railroad cars Three monitoring <br /> wells were placed on the WPRR property to evaluate ground water quality and determine ground <br /> water flow direction and gradient beneath the site Ground water flow direction was calculated to <br /> • be to the north beneath the site The northernmost monitoring well (MW2) is located along the <br /> southern boundary of the Crystal site and may provide valuable data in evaluating the ground <br /> water characteristics beneath the Crystal site Results of RESNA's investigation are included in <br /> their Second Phase Subsurface Investigation Report dated June 17, 1992 RESNA concludes in <br /> their report that "the results of this investigation indicate that former site operations have not <br /> significantly impacted beneficial use of the ground water beneath the site " <br /> Proposed Scope of Work <br /> Further investigation to evaluate the extent of petroleum contaminated soils immediately west and <br /> east of the former tank is not necessary based on total petroleum hydrocarbons (TPH) <br /> concentrations below 1 mg/kg in samples S-18-5 and B1 Additional assessment of soils north of <br /> the former tank will not be completed during this phase of work due to the low concentrations of <br /> TPH-gasoline (28 6 mg/kg) detected in sample B2 at a depth of 15 feet Additional evaluation of <br /> soils to the south of the former tank is considered impractical due to the location of the loading <br /> dock and refrigeration warehouse <br /> WALLACE KUHL <br /> R„kd p yh. FrASSOCIATCS lil'.0 <br />