Laserfiche WebLink
12102 '02 TETE 09 15 FAX 19259469968 ERMWEST WC Z006 <br /> Mr Harlm Knoll <br /> 151une 1999 <br /> Page 5 <br /> After installation and prior to being developed and sampled, the <br /> monitoring wells were allowed to stabilize with the aquifer for <br /> approximately 1 week The wells were then opened and allowed to <br /> stabilize with the atmosphere for approximately 5 minutes prior to <br /> collecting water level measurements The total depth and static water <br /> level of each well was measured to the nearest 0 01 foot using an <br /> electronic water level indicator The top-of-casing elevation for each well <br /> was surveyed to a nearby benchmark by a California-licensed <br /> and-registered surveyor Gauging and surveying information was <br /> compiled to evaluate ground water flow direction <br /> A combination of surging and bailing was used to remove loose silt and <br /> fine sand from the filter pack A minimum of 10 casing volumes of water <br /> were purged from each well, using a disposable bailer After purging, the <br /> monitoring wells were again allowed to stabilize prior to collection of <br /> ground water samples <br /> All ground water Samples were collected with disposable bailers, then <br /> placed directly into laboratory-supplied containers,labeled, and shipped <br /> to the laboratory in an iced cooler All ground water samples were <br /> submitted for analysis of TPH-g, MIX, and fuel oxygenates In addition, <br /> for QA/QC purposes, ERM submitted one blind duplicate and one trip <br /> blank for TPH, BTEX, and fuel oxygenates analysis <br /> RESULTS <br /> Geology and Hydrology <br /> Based on ERM's field classification, the site consists primarily of silty <br /> clays and clayey silts Ground water was encountered at approximately <br /> 38 feet bgs in all drilling locations on site Stabilized ground water <br /> elevations are approximately 35 feet bgs ERM calculated ground water <br /> elevations using depth-to-water information and survey elevations <br /> provided in Table 1. Ground water flow in the shallow aquifer beneath <br /> the site is generally towards the northeast, as shown on Figure 3 <br /> Additional information on site geology and hydrology is provided in the <br /> boring/monitoring well logs in Appendix A <br />