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Wright <br /> November 4,2004 6 Environmental <br /> ProjectNo. 4891-01-QM OEC `NEPA-�N <br /> Services, Inc. <br /> M & M Builders Supply �'�' 707 East 11`"street,suite 120 <br /> P. G. Box 1107 Tracy,CA 95376 <br /> Tracy,CA 95378-1107 <br /> Attn.: Mr. Shawn Kelly <br /> Re: Quarterly Groundwater Monitoring Report, M&M Builders, 8111 West <br /> 11th Street,Tracy,CA; PHS EHD Site Code 1530 <br /> Dear Mr. Kelly, <br /> Wright Environmental Services, Inc. (Wright) has completed the work for the Quarterly <br /> Groundwater Monitoring Report at the above referenced site located at 8111 West Eleventh <br /> Street, Tracy, California (see Figure 1). The purpose of this work is to provide quarterly <br /> groundwater monitoring as required by the San Joaquin County Environmental Health <br /> Division (SJC EHD). The sampling for the third quarter 2004 is for well MW-3 only; <br /> water levels were measured in all three monitoring wells. <br /> 1.0 Field Methods <br /> Groundwater Monitoring Well Sampling <br /> The well was sampled on September 20, 2004 by a sampling contractor; the monitoring <br /> schedule only has MW-3 for chemical analysis his quarter. The monitoring well was <br /> purged using calculated well volumes based upon the depth to water in each casing. Depth <br /> to groundwater measurements were made to the nearest one-one hundredth of one foot, and <br /> also checked for the presence of separate phase product. As each purge volume is removed, <br /> measurements of pH, electrical conductivity and temperature were taken until these <br /> parameters stabilize, which is interpreted to be aquifer water entering the casing. The well <br /> was allowed to recover to 80% of the initially measured water level, and then samples were <br /> collected. The sample was carefully collected with a clean bailer and poured into the <br /> appropriate laboratory prepared container with minimum cavitation. Each water sample was <br /> labeled, logged onto a chain-of-custody form, and placed in a chilled ice chest. Upon <br /> completion of well sampling,the well was closed and locked. <br /> Table 1. Groundwater Well Water Levels,September 2004 <br /> Date Depth to Well Easing Groundwater Comments <br /> Measured Water(ft) Depth(ft) Elevation(msl Elev.(ft) <br /> ft <br /> MW-1 9/20/04 8.43 20.97 45.09 36.66 None <br /> MW-2 9/20/047.89 25.05 45.41 37.52 None <br /> MW-3 9/20/04 8.21 24.81 46.01 37.80 Nona <br /> Page 1 of 5 <br />