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�An upgradient groundwater sample compared with one or more downgradient groundwater samplesould determine potential impact. However, this would be contingent upon determining the accurate <br /> groundwater directional flow. <br /> An on-site vadose zone monitoring well is located near the center of the middle filter bed. The well <br /> casing is 58 inches deep. This well was designed to only measure potential inflow of vadose zone <br /> water, and not of groundwater or phreatic water. An electronic water level meter was used to detect <br /> the presence of water within this well. No free-standing water was detected. It is recommended this <br /> monitoring well be checked on a regular basis after complete build-out. If free vadose zone water is <br /> captured by the well, a percentage of the reserve area may have to be activated. <br /> Analysis of the on-site well that will serve the entire built-out project reveals a very low nitrate <br /> concentration of 7 ppm. Given the tremendous nitrate impact occurring upgradient to this well, it can <br /> be deduced that the well is screened in aquifers that are protected from the downward migration of <br /> nitrate, most probably by thick clay strata. It may also be that the natural denitrification potential in <br /> these aquifers is sufficient enough to maintain a low nitrate concentration. <br /> VI. LIMITATIONS <br /> The findings, opinions, conclusions and recommendations expressed in this report are based upon <br /> information from obtained engineering data and analytical test procedures, contemporary scientific <br /> literature and agency consultations. Information in this report is deemed reliable by the sources from <br /> where it was obtained. <br /> This report is based upon current scientific knowledge to assess factors which are extremely variable <br /> and complex within the environment. Although there are several methods to predict impact from <br /> septic systems, San Joaquin County Environmental Health Division Sewage Standards, federal and <br /> state publications, and information from the scientific literature have been employed for these <br /> purposes, and for this project. Therefore, no guarantee or warranty concerning any aspect of this <br /> investigation is expressed or implied. <br /> We appreciate the opportunity to provide this service for you. If there should be any questions <br /> regarding the information contained ir�Seb , lease contact the undersigned. <br /> Respectfully submitted, ;o� <br /> No. 04075 <br /> CHESNEY CONSULTING <br /> Expires: <br /> •,. Fa <br /> CP CAS �, u <br /> Don Chesney, R.E.A. <br /> Registered Environme tal Assessor#1675 <br /> Page -8- <br /> Chesney Consulting <br />