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f <br /> t <br /> Pro <br /> /7.San <br /> perry, Lodi 3 _Joaquin County August'13, 1993 <br /> Installation of one monitoring well in the area of highest soil contamination may detect the presence <br /> water flow and thus ground water contamination may not be detected. Cone penetrometer <br /> ground water contamination, however, it is not possible to determine the direction of eround <br /> r <br /> instruments are not as reliable as monitoring wells at collecting ground water samples and detect' <br /> contamination within a sample. In addition, it may not be possible to determine the direction of <br /> ground water flow from the information provided by the cone penetrometer. <br /> I <br /> To determine if ground water has been.impacted, a qualified consultant must prepare a work plan, <br /> install at least one y ) ! <br /> (preferably three monitoring well(s) or several cone penetrometers, and prepare <br /> a report describing the work that has been completed. Once the additiotialwork has been done, if <br /> ground water;is not''impacted, we can consider a request for closure.` However, if ground water has Y <br /> been impacted, additional soil and ground water monitoring and investigation, as well as cleanup, <br /> inay be necessary. <br /> e <br /> FARM TANKS/REGULATIONS <br /> From Ms. Duncan's letter it was apparent that she was concerned that the tanks at the site and any <br /> contamination may have been exempt from underground tank statutes and regulations. The f <br /> Underground Tank Statute, Chapter 6.7 of the California Health and Safety Code,`Section 25281 <br /> does indeed exclude farm tanks from the definition of regulated underground tanks. The ' <br /> Underground Tank Regulations, Title-23, Division 3, Chapter 16 of the California Code of <br /> Regulations, exempt farm tanks from the construction standards and monitoring and reporting <br /> requirements required of underground tanks. <br /> When a tank leaks, however, the California Water Code requires the protection of the waters of the <br /> state. What we are requiring, under the Water Code, is the report which defines the site conditions. <br /> Once the definition is made, a decision can be made regarding the site. <br /> J <br /> ' 4 <br /> _ '•r^qr•.�. :ax^:y"�^�rl�-tea^. <br /> t <br /> k <br /> � p <br />