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SECOR <br /> i International IncoiPorated <br /> JN 40007-097-01 <br /> PAYMENT <br /> RECEIVED <br /> I� March 10, 1997 's r. ? 4 9 T"I" <br /> PliSOC HEA1-';1 S"_RVICES <br /> Mr. Michael Infurna Et�NV1R0NM1VTTAL..EAS.1 H DIV!SiON <br /> San Joaquin County <br /> Environmental Health Division <br /> 300 East Weber Avenue, 3rd Floor <br /> P.O. Box 388 <br /> Stockton, California 95201-0380 <br /> E REQUEST FOR THE ABANDONMENT OF THREE <br /> EXISTING MONITORING WELLS <br /> Proposed ARCO site located at the <br /> 4 SE Corner of S. Main Street and <br /> " <br /> Industrial Park Drive, <br /> Manteca, California'- <br /> APN: 221-019-08 <br /> . ISI <br /> Dear Mr. Infurna: <br /> On behalf of ARCO Products Company, SECOR International Incorporated (SECOR) is <br /> submitting this request to abandon three existing monitoring wells. The three wells were <br /> installed ori November 21, 1996. They were installed in conjunction with a geotechnical <br /> investigation. At this time the wells are no longer needed: It is therefore requested that <br /> permission for the abandonment of the monitoring wells be granted. <br /> F <br /> On November 6, 1997, a workplan for the installation of the three wells was submitted, and <br /> subsequently approved,by San Joaquin County. The wells -were installed during November, <br /> 1997. A description of our field operations and findings',are found in our report, titled <br /> "Property Acquisition Environmental Site Assessment", 1Job No. 40007-097-01, dated <br /> 4 December 23, 1996. In addition to our initial investigation, SECOR has completed two <br /> episodes of monthly groundwater sampling and analysis of the three previously installed wells. <br /> ' The sampling episodes were implemented on December 26, 1996 and January 26, 1997. <br /> Both reports are included in this package for your review and comments. <br /> The monitoring wells are each 27 feet deep and consists of a 2-inch diameter PVC casing._ <br /> The screened interval for each casing is approximately five feet long. To abandon each well, <br /> lthe individual PVC casing will be pulled out from the top, and the previous well structure <br /> will be drilled out using an 8-inch hollow stem auger. The previous soil boring housing the <br /> 25864-F Business Center Drive, Redlands, CA 92374-4515 (909)335-6116 (909)335-6120 FAX <br />