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(§ 4.2) Test results from the old and new domestic wells reveals an attenuation of they downward <br /> migration of nitrate supposedly by intervening clay strata. Or, the possibility remains tAat sign €rEant <br /> denitrification is occurring in the underlying aquifers. The DBCP concentration increasing 3x with <br /> increasing depth is concerning. Conventional thought would be that downward migration of DBCP <br /> molecules may be attenuated by clay strata. Apparently what could be occurring is that DBCP was <br /> applied upgradient to this site in an area where there is few, if any underlying clay strata. The DBCP <br /> has migrated downward into the aquifer the new well is screened in, unimpeded. <br /> In unsewered areas and/o areas that have been, or currently are un dr`agrircultural-prZo3 on, it is <br /> highly recommended tl fit,bottled water b�-for-dr-i tn"nd,-eooking.Jaurposes. <br /> LIMITATIONS <br /> The findings, testing, opinions and conclusions of this report are based upon information from <br /> standard engineering and analytical test procedures, contemporary scientific literature and agency <br /> consultations. Information in this report is deemed reliable by the sources from where it was <br /> obtained. Results of the percolation testing should be assumed to only represent the subsurface <br /> conditions encountered in the very specific location of testing as denoted on the Tentative Map, and <br /> not of the entire proposed two Parcels. <br /> This report is based upon current scientific knowledge to assess factors which are extremely variable <br /> and complex within the environment. San Joaquin County Environmental Health Department <br /> Sewage Standards have been employed for the purpose of preparing this study. Therefore, no <br /> guarantee or warranty is expressed or implied concerning any aspect of this investigation, the <br /> prevention of environmental impact, or related issues. <br /> The opportunity to provide this service for you is appreciated. If there should be any questions <br /> regarding the information contained within this report, please contact the undersigned. <br /> Respectfully submitted, 't A4 <br /> (§ 7.1)CHESNEY CONSULTING `•`' Qa` ' �' <br /> No. 04675 �x <br /> w <br /> � Expires; � <br /> J <br /> N.A <br /> P CA <br /> Don Chesney, R.E.A.- I <br /> Registered Environmental Assessor#4675 <br /> Page -6- <br /> Chesney Consulting <br />