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SPDSS Task 40.2 Technical Memorandum <br />1. Contact State personnel for a list of wells slated for abandonment or replacement. <br />2. Verify well location is within the SPDSS study area. <br />3. Request well permit images for candidate wells from State. <br />4. Review well depth, well completion information, well screen interval, casing and <br />cementing information and availability of driller's or geophysical log and <br />determine if the well is screened in a single aquifer. <br />5. Verify that there are no current monitoring wells in same aquifer nearby. <br />6. Submit a list of wells identified for conversion to SPDSS project manager for <br />review and discussion. <br />7. Prepare letters to be sent by SEO or CWCB staff to the well owner requesting <br />conversion of their former well. <br />8. Wells whose owners agree to convert their wells will be identified and brought <br />to the attention of the SEO. <br />State Engineer Office staff indicated that there were no wells identified for <br />abandonment. Therefore, this procedure was used to identify existing well permits <br />whose owners have filed for replacement wells and have not filed an abandonment <br />report for their original well. <br />2.0 Results of Identifying Wells Scheduled for Replacement <br />The Division 1 Engineer was contacted to identify wells slated for replacement or <br />abandonment. The Engineer referred CDM to the SEO office in Denver. The SEO was <br />contacted by CDM to identify wells that have been replaced within the Denver Basin <br />study region. In discussions with SEO staff it was determined that the best method to <br />identify candidates would be to perform a query of the Division of Water Resources <br />(DWR) well permit database for wells that have filed for replacement and do not have <br />an abandonment report on file would produce a list of potential candidates. This query <br />resulted in a list of 3,668 replacement well applications located within the approximately <br />330 township that cover all or parts of the SPDSS Denver Basin Region. <br />This selection of well permits was further refined to include only those that filed for <br />replacement in 2003 or 2004. It was assumed that recent filings would have higher <br />probability of not having the original well already plugged and thus be potentially <br />available for conversion. This reduced the number of candidates to 45 wells. <br />The well permit images for these 45 candidates were requested from the SEO. Upon <br />review of the well permits, it was discovered that the images transmitted were <br />associated with the replaced wells, not the original wells slated for abandonment. <br />Before the images for the original wells were requested, the list of candidate wells was <br />further refined based on location, using study boundaries and well coordinates in GIS. <br />Six wells were removed because the wells were located outside the SPDSS study area. <br />Four wells were removed due to being located in the'complex area' in the northwest <br />portion of the Denver Basin. This area of the Denver Basin has extensive faulting and <br />vertical displacement in which aquifer data is not likely to be representative of water <br />levels in adjacent parts of the aquifer outside the complex area. The remaining 35 <br />candidates were reviewed by CWCB staff, but they were unable to retrieve well permits <br />2 <br />