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4 <br /> ' Wright <br /> Environmental <br /> h ` Services, Inc. <br /> Construction • Engineering • Remediation <br /> January 20, 2004 <br /> Project No. 4891-01-QM <br /> M&M Builders Supply <br /> P. O. Box 1107 <br /> Tracy, CA 95378-1107 <br /> Re: Quarterly Groundwater Monitoring Report for December 15, 2003 <br /> for 8111 West 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 <br /> Eleventh Street, Tracy, California (see Figure 1). The purpose of this work is to provide <br /> quarterly groundwater monitoring as required by the San Joaquin County Environmental <br /> Health Division (SJC EHD). <br /> Field Methods <br /> r.. <br /> Groundwater Monitoring Well Sampling <br /> The wells were sampled on December 15, 2003. Each monitoring well was purged using <br /> calculated well volumes based upon the depth to water in each casing. Depth to <br /> 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 <br /> removed, measurements of PH, electrical conductivity and temperature were taken until <br /> these parameters stabilize, which is interpreted to be aquifer water entering the casing. <br /> The well was allowed to recover to 80% of the initially measured water level, and then <br /> samples were collected. The sample was carefully collected with a clean bailer and poured <br /> into the appropriate laboratory prepared container with minimum cavitation. Each water <br /> sample was labeled, logged onto a chain-of-custody form, and placed in a chilled ice chest. <br /> Upon completion of well sampling, the well was closed and locked and the sampler moved <br /> to the next well. <br /> Table 1. Groundwater Well Water Levels, December 2003 <br /> Depth to Well Depth Casing Groundwater Comments <br /> Water(ft) (ft) Elevation(msl Elev.(ft) <br /> ft <br /> MW-1 8.44 20.97 45.09 36.65 None <br /> MW-2 7.95 25.05 45.41 37.46 None <br /> MW-3 1 8.30 1 24.81 1 46.01 1 37.71 None <br /> 67 E. 10th Street • Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> wright@inreach.com Lic.#651501 A-B HazMat, C21 Page 1 �A� <br /> websit http://wrightenvirvnmentalservices.com r1/ <br />