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COS January 1996 Meeting <br /> Page 2 <br /> correspondence dated January 10, 1996 appeared to respond to PHS/EHD comments. However, <br /> upon closer evaluation, one soil boring converted into a monitoring well located in the proximity of <br /> N1 and 131 should provide adequate information to estimate the extent of residual soil contamination <br /> and to determine if additional groundwater investigation is necessary. <br /> Argonne and Picardy/Victory Park <br /> PHS/EHD maintained that it was necessary to estimate the extent of residual soil <br /> contamination. A work plan for the destruction of the monitoring well will be submitted <br /> along with the residual contamination estimate. PHS/EHD indicated that site closure would <br /> be granted, if residual contamination proved not to pose a threat to groundwater and the <br /> monitoring well was destroyed under permit. <br /> 22 East Market/Police Station <br /> A draft report evaluating the environmental fate of the residual soil contamination has been <br /> prepared and will be submitted with the work plan to destroy the monitoring well following <br /> MTBE analysis. <br /> Fontana Drive at Smith Canal <br /> A mass volume estimate of past quarterly groundwater quality data will be determined and <br /> presented graphically over time, along with groundwater elevation data. This presentation <br /> will provide a better indication of trends in the groundwater plume. Also, the mass of <br /> hydrocarbons evidenced near monitoring well MW4 can be estimated and compared to the <br /> mass of hydrocarbons evidenced in the perimeter wells. This evaluation can provide an <br /> insight as to the benefit that may be gained in addressing those areas showing the most <br /> impact (most mass) only. The need for active remediation at this site will be reconsidered <br /> after the evaluation of the above noted reformatted groundwater monitoring data. <br /> 110 West Sonora <br /> The investigation at the nearby PG&E facility and the statements made in reports for the <br /> PG&E facility indicating the fire station may be a possible source to contamination at the <br /> PG&E facility were discussed. The lead agency for the PG&E facility, the Department of <br /> Toxic Substances Control, has indicated to PHS/EHD that they will not be requiring the City <br /> of Stockton to initiate any work at the fire station with regard to contamination found at the <br /> PG&E facility at this time. The need for active source removal (the mass of contamination <br /> located near the former tank pit area) was discussed as was the possibility of preforming a <br /> vertical groundwater investigation due to the presence of a known downward groundwater <br /> flow factor documented at the PG&E site. The ultimate need for deeper groundwater <br /> monitoring wells will depend on the status of the cleanup of the source area at this site. <br /> The cost approval process for the remedial system will be re-initiated and should be <br /> completed by March 1996. <br /> 1740 Houston Avenue <br /> The Twining Laboratories will submit a work plan which proposes sufficient soil borings and <br /> soil and groundwater sampling to characterize the full extent of the release. PHS/EHD <br /> recommends that the work plan include soil analyses to determine the site specific <br /> environmental fate attenuation factors, some of which are listed in the CVRWQCB <br /> Designated Level Methodology, a Waste Extraction Test using deionized water to determine <br /> the leachability of the most mobile, toxic, and environmentally persistent fractions of the <br /> waste. <br />