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CLEARWATER <br /> G R O U P, I N C <br /> from each well while field personnel monitored temperature, conductivity, and pH <br /> These parameters were measured during groundwater purging to ensure collection <br /> of a representative groundwater sample After groundwater in the wells recovered <br /> to 80% of the pre-purged volume, polyethylene sampling bailers (one dedicated to <br /> each well) were used to collect groundwater samples Water samples were <br /> transferred to laboratory-supplied sample bottles (containing hydrochloric acid as a <br /> preservative) and labeled with appropriate well designations <br />' Samples were documented on a chain-of-custody form and placed in a chilled cooler <br /> for shipment to PACE The following is a summary of the analytes, anal tical <br /> methods, and corresponding laboratory reporting limits for oundwater analyses <br /> • TPHg California LUFT Manual, 50 parts per billion (ppb) 6� <br /> • TPHd modified EPA Method 8015, 47 ppb (55k;D <br /> • Benzene, toluene, and ethylbenzene California LUFT Manual, 0 5 ppb <br /> PO • Xylenes California LUFT Manual, 1 ppb (.15) <br /> • MTBE California LUFT Manual, 5 ppb <br /> On July 27, 1995, the top of casing elevation on each well was surveyed by Tom O <br /> Morrow, a licensed surveyor, to the nearest 0 01 foot The measurements were <br />' made relative to City of Lodi benchmark #516, located on the northwest corner of <br /> Lodi Avenue and Lee Street Field data sheets wluch include gauging, <br /> development, sampling, and survey data are included in Appendix C <br />' Clearwater surveyed the wells relative to the same benchmark reportedly used by <br /> Geocon during their investigation of the FDIC site across West Lodi Avenue On <br /> behalf of MBP, a request was recently made to obtain comparable groundwater data <br /> by concurrently measuring water levels at both sites. This request was denied <br /> 2.4 Review of Local Groundwater Data <br /> In accordance with the workplan submitted by Clearwater, information regarding <br /> the distribution of contaminants in local groundwater was reviewed by contacting <br /> the California Environmental Protection Agency Department of Toxic Substances <br /> Control (DISC) Clearwater telephoned DTSC personnel and reviewed publications <br /> regarding the DTSC assessment of groundwater contamination in Lodi <br />' C-115 PRE AR 10/95 4 October 11, 1995 <br />