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SEPAL <br /> H 2 0 G E O L D FN�/Ro ' .9 20,95 <br /> • A GROUND WATER CONSULTANCY pt)?41,7j l vl�TrLi�y <br /> I(,�v <br /> Mr Harlan Knoll, R.E H S August 23, 2005 <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE Third Quarter 2005 Groundwater Monitoring Report -Former Donna Gardner <br /> Property, 26056/26080 North Thornton Road, Thornton, CA. <br /> Dear Mr Knoll, <br /> This Third Quarter, 2005 Groundwater Monitoring Report is submitted by H2OGEOL on <br /> 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 July 31, 2005 between <br /> 10 10 and 10 25 hours Depths to water were measured to+/-0 01 feet using a Sohnst <br /> iModel water level meter The depths to water were converted to potenhometnc 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, casing top elevations, and <br /> potentiometnc 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 potentnometnc 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 poten-Dometnc surface for the six monitoring <br /> wells on July 31, 2005 The potentnometnc surface was domed centering in the vicinity of <br /> monitoring wells MW-3 and MW-4(Figure 2) <br /> 2 0 MONITORING WELL PURGING AND SAMPLING <br /> Monitoring well purging and sampling occurred on July 31, 2005 for the Third Quarter <br /> 2005 event Only two of the wells are monitored MW-3 and MW-4 <br /> P 0 Box 2165 ■ Lrvermore Cahforma 94551-2165 0 (925)373-9211 <br />