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!I% Wright <br /> Environmental <br /> Services, Inc. W EC WED <br /> �-' August 12,2002 AUG 2 6 2002 <br /> Construction ♦ Engineering ♦ Remediation <br /> Project No. 4891-01-QM <br /> ENVIRONMENT HEALTH <br /> M &M Builders Supply PERMIT/SERVICES <br /> P. O. Box 1107 <br /> Tracy, CA 95378-1107 <br /> Attn.: W. Shawn Kelly <br /> Re: Quarterly Groundwater Monitoring Report M&M Builders, 8111 West 11th <br /> 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 Public Health <br /> Services Environmental Health Division(PHS EHD). <br /> Field Methods <br /> Groundwater Monitoring Well Sampling <br /> The wells were sampled on June 21, 2002. 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 <br /> poured into the appropriate laboratory prepared container with minimum cavitation. Each <br /> water sample was labeled, logged onto a chain-of-custody form, and placed in a chilled <br /> ice chest. Upon completion of well sampling, the well was closed and locked and the <br /> sampler moved to the next well. <br /> Table 1. Groundwater Well Water Levels <br /> Depth to Well Depth Casing Groundwater Comments <br /> L__� Water(ft) (ft) Elevation(msl Elev.(ft) <br /> ft) <br /> MW-1 7.49 20.97 45.09 37.10 None <br /> MW-2 7.31 1 25.05 1 45.41 37.97 1 None <br /> MW-3 6.49 1 24.81 1 46.01 39.22 1 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 Page 1 i4M <br /> websit http://home.inreach.comAvright <br />