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KLE//NFELDER <br /> er, a ftht saludom, �- <br /> 18. Past subsurface exploration of the property by Kleinfelder shows that soil <br /> beneath the site can be very generally summarized as a clayey gravel (with <br /> an inconsistently present 2-foot thick interbedded layer of sandy clay or <br /> clayey sand ) present to a depth of approximately 17 feet) . The clayey gravel <br /> is generally underlain by an approximately 5-10 foot thick layer of silt or <br /> clayey silt. The silt layer is underlain by a silty sand which may contain <br /> interbedded layers of clay or clayey silt. <br /> 19 . The area around the Escalon Bellota Road bridge over Potter Creek appears <br /> to be in connection with the shallow perched groundwater in that immediate <br /> area . If the two are in connection with each other, then water quality in the <br /> area of MW-5 could be influenced by the water quality within that area of <br /> Potter Creek. It is unknown if Potter Creek is a gaining or loosing stream in <br /> that area . Past water flow estimates on Potter Creek as a part of the <br /> Nursery's monitoring has also pointed to discrepancies in the creek's flow in <br /> that area . However, due to the consistent lack of perched water in the <br /> nursery's wells MW-4s and MW-4d , it appears that the area in which Potter <br /> Creek is in connection with the shallow perched groundwater is limited . <br /> 20 . Significant flows of surface water apparently originating from the dry pasture <br /> two lots east of the nursery entered the southeast corner of the nursery from <br /> approximately May 21 to 28, 1999. The water was observed from the air by <br /> Ms . Linda Santos of Norman 's Nursery. The water entered the nursery <br /> property and flowed into the triangular basin behind the nursery offices . Once <br /> it filled that basin (which had been at a much lower level) , the water flowed <br /> into the nursery's eastern canal and on to Sample Location S1 . This <br /> additional water increased flow in sample location S1 approximately 10 to 60 <br /> times over that noted in previous days. <br /> The water appeared turbid where it entered the nursery property. The water <br /> had the potential to be adversely affecting surface water quality on the <br /> nursery. Therefore, on May 25 , 1999, a sample of the surface flow was <br /> obtained near the nursery's eastern property line by Ms . Linda Santos of <br /> Norman's Nursery. The sample was transported to FGL Environmental <br /> Laboratory in Stockton , California for analysis . Chemical analysis showed no <br /> detectable nitrate-nitrogen (<0 . 1 mg/I) and no detectable ammonia-nitrogen <br /> (<0 .2 mg/I) in the sample. However, the initial surge of the flow was not <br /> sampled . The weekly sample obtained from surface water monitoring location <br /> S-1 on May 29 , 1999, did , however, contain 11 mg/I of nitrate as nitrogen . <br /> The concentration of 11 mg/I is above the MCL and is an increase of <br /> approximately 104imes the concentration of the previous two weeks' <br /> samples. When the increased flow subsided , the concentrations of nitrate- <br /> nitrogen in 3- 1 decreased 10-fold to its previous concentrations . According <br /> to Ms. Linda Santos , increased flows of this type were noted during past <br /> summers by Norman's Nursery personnel , but apparently went unreported to <br /> nursery management and were therefore not reported to Kleinfelder or <br /> sampled . <br /> 117226.E02/ST013Ro176 Page 11 of 40 January 31 , 2013 , <br /> Copyright 2013 Kleinfelder <br />