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SAMPLING AND WELL CONSTRUCTION PROCEDURES <br /> In your 29 August 1989 correspondence to Gold Bond Building Products, you stated that the <br /> monitoring wells AEMC installed around the 5,500-barrel #6 fuel tank were only to be used to <br /> define the groundwater gradient so that more monitoring wells could be constructed. <br /> In AEMC's Underground Tank Monitoring Plan for Gold Bond Building Products, revised <br /> 22 August 1988, it is stated that monitoring wells will be established upgradient and <br /> downgradient from the 5,500-barrel #6 fuel tank. This was revised to include a third <br /> monitoring well in the vicinity of the 5,500-barrel #6 fuel tank following concerns expressed by <br /> the Regional Water Quality Control Board in your 8 September 1988 correspondence to Gold <br /> Bond Building Products and in the CVRWQCB's 20 September 1988 meeting with AEMC. <br /> During the 20 September 1988 meeting between the CVRWQC13 and AEMC, it was initially <br /> _ agreed that once the downgradient direction of groundwater had been established, the <br /> monitoring well downgradient from the 5,500-barrel #6 fuel would be sampled. <br /> If none of the monitoring wells were found to be in the prevailing downgradient direction, a <br /> fourth monitoring well would have had to be installed downgradient from the 5,500-barrel <br /> #6 fuel tank. In AEMC's Hydrogeologic Assessment and Tank Monitoring Plan, dated <br /> 3 March 1983, it is clearly shown that although groundwater direction is variable at this <br /> location, monitoring well MW1 is in the prevailing downgradient groundwater flow direction. <br /> This eliminates the need for installation of any more monitoring wells and complies with the <br /> California Administrative Code, Title 23, Chapter 3, Subchapter 16, Article 4, Table 4.1, <br /> "Monitoring Alternatives," alternative #2, which states that one (1) monitoring well is required <br /> in the downgradient direction from the underground fuel storage tank. <br /> In your 29 August 1989 correspondence to Gold Bond Building Products, you stated that soil <br /> samples were not properly analyzed and the monitoring wells were not constructed according <br /> „ �.2 Page 5 <br />