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Ms . Diane Hinson <br /> Apache Plastics <br /> San Joaquin County - 2 - 22 April 1991 <br /> In the County comments , there was a question that there might be a problem <br /> with the wells being surveyed at different times at the site . Wells are <br /> surveyed for two reasons : to determine the elevation of the well and water <br /> surface for gradients . If the top of the well casings are surveyed at <br /> different times , I do not see where that would create any accuracy problem <br /> with the water surface elevation measurements , as long as it was done <br /> correctly . However , the water surface elevation must be sampled on the same <br /> day to determine ground water gradients or the data could be meaningless . <br /> I recommend that Apache Plastics submit a time schedule , by 17 May 1991 , for <br /> completing a PAR no later than 7 June 1991 . <br /> Please contact me at ( 916 ) 361 - 5723 if you have any questions . <br /> J ES MAUGHAN <br /> Area Engineer <br /> JBM : gs <br /> f <br />