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0 G E 0 L REwsH <br /> A GROUND WATER CONSULTANCY DEC 7 <br /> 1204 <br /> Mr Harlan Knoll, R.E H S Nove IRG1^ - 1EALFM <br /> Senior Registered Environmental Health Specnahst nlUl� / ERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE Fourth Quarter 2004 Groundwater Monitoring Report -Former Donna Gardner <br /> Property, 26056/26080 North Thornton Road, Thornton, CA. <br /> Dear Mr Knoll, <br /> This Fourth Quarter, 2004 Groundwater Monitoring Report is submitted by H20GEOL <br /> on behalf of R B Construction, Inc for the former Donna Gardner Property, located at <br /> 26056/26080 North Thornton Road in Thornton The site location is shown on Figure 1 <br /> 10 POTENTIOMETRIC SURFACE <br /> The depth to water in each monitoring well was measured on October 18, 2004 between <br /> 09 22 and 09 38 hours Depths to water were measured to+/- 0 01 feet using a Sohnst <br /> Model water level meter The depths to water were converted to potentiometric surface <br /> elevation by subtracting the measured depths to water from the casing top elevations <br /> reported in the September 29, 2003 groundwater monitoring report submitted by <br /> Environmental Restoration Services The depth to water, casmg top elevations, and <br /> potentnometnc surface elevations are presented in Table 1 All available previous water <br /> level measurements are also summarized in Attachment C <br /> Table 2 lists the slope(gradient) and direction of gradient of the potentiometric surface <br /> for the triangles with a well at each apex for these water level measurements <br /> Figure 2 is a map showing the approximate potentnometnc surface for the six monitoring <br /> wells on October 18, 2004 The potentiometric surface was domed centering on <br /> monitoring well MW-3, as has previously been the case(Figure 2) <br /> 2 0 MONITORING WELL PURGING AND SAMPLING <br /> Monitoring well purging and sampling occurred on October 18, 2004 for the Fourth <br /> Quarter 2004 event Only two of the wells are monitored MW-3 and MW4 <br /> P 0 Box 2165 0 Livermore Califorma 94551-2165 ■ (925)373-9211 <br />