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I <br /> April 20, 2005 <br /> NOA Project Number: E04116A <br /> Page 2 <br /> After talking to Mr. Marshal McCloud from the Tracy Defense Depot (personal communication, <br /> April 6, 2005) he believes that the Depot is not a source of DBCP in the area. He said that they have <br /> done extensive testing and have found no traces of DBCP on the property or in any of the <br /> monitoring wells for the contamination plume. He also said that there are no records of the Depot <br /> ever storing or using DBCP. He also noted that DBCP is a "primary" chemical is not formed from <br /> the break down of other chemicals. <br /> Dibromochloropropane (DBCP) is a pesticide that was used for over 20 years,until 1977, to control <br />` y worms that.cause_damage to crops.and-other plants. Though it is no longer used or produced in the '" ` F <br /> United States, DBCP is still found in groundwater in areas with past high use (Cornell, 2004). Being <br /> that the subject property and the area surrounding it has been used as agriculture for a long time,it <br /> is possible that DBCP was applied to fields. <br /> 5.1-5.2: As you noted, there was an error in the report as to our percolation test hole diameter. The <br /> percolation test holes were drilled with a three inch diameter hand auger. When the drilling of the <br /> holes is complete, the diameter of the hole is 4 inches. We have replaced our old three inch diameter <br /> hand auger with a four inch auger, to avoid confusion and to insure that our holes fully comply with <br /> EHD requirements. <br /> 6.5: The pre-tests for the one hour percolation tests lasted 10 minutes, the one hour test and pre-test <br /> criteria were satisfied so the pre-tests became the first reading of the percolation tests. <br /> We appreciate your recommendations for this project and your continued interest in our work. <br /> Best Regards, <br /> NEIL O.ANDERSON&ASSOC., INC. <br /> No. 215_1 - <br /> �. CERTIFIED • <br /> Rebecca Haskett,B.S. avid J. Welch,M.Sc. ti. ENGINEERING <br /> Project Manager CEG-2151, CHG-653, GP-1049 a GEOLOGIST <br /> Environmental Division Manager � <br /> . <br /> CC: Mr.Jim Edwards <br /> 23544 South Banta Road <br /> Tracy, CA 95304 <br /> Cornell University,Program on Breast Cancer and Environmental Risk Factors, 2004, <br /> htip://envirocancer.comell.edu/FactSheet/Pesticide/fsSO.dbcl2.cfm <br /> Mc Cloud,Marshall, personal communication,April 6, 2005. <br /> United States Environmental Protection Agency, 2005, ht osemite.e a. ov <br /> M <br />