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at' <br /> ESTATE OF CALIFORNIA i+ GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD= <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> Ms. Diane Hinson .17 May 1989 <br /> San Joaquin Local Health-.Distri-ct " <br /> P. 0. Box 2009 <br /> Stockton, CA 95201 <br /> GROUND WATER INVESTIGATION WORK PLAN FOR UNION ICE- COMPANY, 1320 WEST.WEBER <br /> t AVENUE, STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the 13 March 1989 work plan for the Union Ice Company <br /> facility. In their haste to get the site investigated and remedial action <br /> started they neglected to include preliminary information in the work plan. 1 <br /> They should be directed to read page A-8 in Appendix A- of the Tri-Regional <br /> Recommendations and supply the information as outlined'; such as, specify the <br /> contents, sizes, or ages :of the underground tanks,­the-'layout-of the product <br /> pipelines, or the results of the soil and ground water samples collected at <br /> i the time of the tank pull , to name' a few of the ,m.issing items: <br /> In addition' to the lack of preliminary information, we have the following <br /> comments regarding the proposed work plan:: <br /> 1 . The proposed monitoring well locations look'good, and hopefully, will <br /> enable plume definition the first time out.`` The clustered wells are a <br /> good idea. They will -supply data 'an the vertical distribution of the, <br /> plume. <br /> 2. The screened intervals for the proposed shal'_low wells are 10 feet in <br />'k length; five-feet above and five-feet below the water table. The stated <br />` purpose of the. proposed' shallow wells .is todefine the free product- <br /> plume. ` It would seem more prudentto plah-. on using these wells for <br /> dissolved product monitoring as well .- In which ease, URS Consultants <br /> should evaluate the possibility of water level fluctuations to ensure <br /> that water levels will not likely -fall below or rise above the screened <br /> interval . We suggest that URS Consultants review the file and reports <br /> on the nearby McCormick and Baxter site. <br /> 3. We recommend that an additional .shallow monttori-ng well be installed <br /> near the tank excavation in order to-evaluate lateral variations in a <br /> contaminant concentrations. It could be -in stalle"d as part of a cluster j <br /> with MW-4D. ' A shallow well near- the tank excavation is needed for the } <br /> removal of free product.. - This well could .serve this purpose. <br /> 4. The proposed work does not include submitting soil .-samples for <br /> laboratory analysis. -Selected soil samples .,should be., submitted to the <br /> laboratory for BTX&E and TPH as gasoline -and diesel analyses. URS,'" <br /> Consultants should specify their field screening,:techniques for <br /> selecting soil sample for submittal to the laboratory. It should be <br /> stressed to Union Ice Company that the-extent of`.soil 'contamination is <br /> to be delineated and remedial alternatives examined. , <br />