ARCHIVED REPORTS_LIMITED PHASE II ENVIRONMENTAL SITE ASSESSMENT AND SUMMARY OF PROJECT TO DATE

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November 16,2005 • NOA Project Number: E05120B 4.7 Discussion of Analytical Results Based on the groundwater samples obtained,it appears that groundwater beneath the Site has been impacted by Nitrate,TDS,and Electrical Conductivity above the California Maximum Contaminant Levels (MCLS). Boring B-1 was located topographically upgradient from the suspected point sources at the former dairy (the corral and pond areas),while B-2 was topographically downgradient,and B-3 was located topographically cross-gradient but adjacent to the existing and historic pond area. If B-1 is considered representative of background water quality, it appears likely that the dairy operations on the Site are the source of the elevated constituents identified in samples B-2 and B-3. Nitrate was absent in the two soil samples collected at B-2,but TKN was present at high levels in both. This finding is supported by the fact that TKN consists of organic nitrogen compounds which break down over time into Nitrate. 5.0 ADDITIONAL FINDINGS Beyond the scope of the Phase II,NOA performed additional research into the history of the Site itself and into generally accepted practices regarding dairy closures. • 5.1 Communication with SJC EHD David Welch of NOA spoke to Mike Huggins (209-468-3437), Supervising Environmental Health Specialist at the EHD,on November 2 and 9,2005. The purpose of the call was to determine the history of the site and identify any issues which may affect the development of the property. Mr. Huggins said that approximately 3 to 7°/u of dairy cows typically die each year. Often,these cows are inappropriately buried on dairies. He suggested that a request be placed with Bruce Kimbrough,Joanne Kimbrough,Joe Machado,and Lillian Machado to write letters describing all locations on the property where the cows were buried. Because the buried cows are against the solid waste ordinance, they will need to be excavated and properly disposed prior to site development. When asked about his concerns regarding nitrate contamination in the groundwater,Mr. Huggins stated that,because the area will soon utilize public water,he is not particularly concerned. Furthermore,he stated that all wells in the area have grout seals from 50 to 200 feet bgs and,as a result,his concern regarding downgradient nitrate impacts "isn't that great." He is aware that the State could make any determinations regarding water quality. Also,Mr. Huggins mentioned that the Site was involved in a civil lawsuit for allowing runoff to overspill the diary ponds and flow along the adjacent streets. • 8