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�Jwlright <br /> Envir <br /> o © <br /> ServicmEW97,0, <br /> February 10,2005 707 East 11`h street,suite 120,fAw()4/qPery�gLTH <br /> Project No.4891-01-QM ph 209/833-0758;fax 290%* i✓ICES <br /> r M & M Builders Supply J <br /> P. O. Box 1107 <br /> Tracy,CA 95378-1107 <br /> Attn.: Mr.-Shawn Kelly <br /> Re: Quarterly Groundwater Monitoring Report and Request for Closure <br /> M&M Builders, 8111 West 11th Street,Tracy,a CA; <br /> PHS EHD Site Code 1530 <br /> j <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). This report presents sampling for the fourth quarter 2004. <br /> 1.0 Field Methods <br /> 1 <br /> Groundwater Monitoring Well Sampling <br /> The well was sampled on December 23, 2004 by a sampling contractor; the monitoring <br /> schedule only has MW-3 for chemical analysis this 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. <br /> The sample was carefully collected with a clean bailer 3 nd poured into the appropriate <br /> laboratory prepared container with minimum cavitation. JEach water sample was labeled, <br /> logged onto a chain-of-custody form,and placed in a chilled ire chest. Upon completion of <br /> well sampling,the well was closed and locked. <br /> j� <br /> k <br /> E Page 1 of 6 <br /> 'i <br />