Laserfiche WebLink
Diamond Lumber Manteca California Page 2 <br /> "It should be noted at this time that water levels have risen to approximately 215 feet <br /> below ground surface (bgs) The screened portion of monitoring wells SRK MW 1, <br /> SRK MW 2, and SRK MW 3, begins at 23 feet to 25 feet bgs Since we are dealing <br /> with contaminants that float on top of water the samples from these wells may not be <br /> representative of the groundwater quality" <br /> Because of unusual seasonal fluctuations in static water levels, additional groundwater monitoring is <br /> warranted It should be noted, however, that approximately 55 gallons, or roughly fi%e casing volumes <br /> were purged from each well prior to collecting the analytical groundwater sample Purging causes a <br /> localized cone of depression around each monitoring well In essence, the cone of depression causes <br /> a localized drop in the static water level Based on the sandy soil conditions observed during <br /> monitoring well installation and the quantity of water purged, the localized static water level after <br /> purging is considered to be below the top of the screened interval <br /> SRK-MW1 SRK-MW2 and SRK-MW3 were installed during November 1491 under the direct <br /> guidance of the PHS/EHD when San Joaquin County and the surrounding areas were experiencing a <br /> drought, while site observations made during the February 5, 1991) monitoring event indicate that this <br /> region is receiving near normal levels of precipitation <br /> If you have any questions or require additional information, please do not hesitate to contact us <br /> With regards, <br /> STEFFEN ROBERTSON AND KIRSTEN (U S ) INC <br /> ,a—,tl P. 7 Vw W�I <br /> Rob Gwilym, C P G <br /> 'Principal, Senior Environmental Geoscientist <br /> 1 <br /> ager <br /> Environmental Hydrogeologist <br /> DS/sal <br /> cc Ann Arney - 650 Management <br /> ' Steffen Robertson and Kosten <br /> use+ r:u•aw .os <br />