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4+� • June 10, 1998 , Page 3 monitoring well boring,will be analyzed for Tier One RBCA r• physical parameters Analytical methods are presented in Attachment A • Groundwater Analysis. After well development, water samples will be collected from the wells and submitted to a California State- certified laboratory for analysts Groundwater samples will be analyzed for the presence of TPH-g, BTEX, and oxygenates including MtBE • Sensitive Receptor Survey. A sensitive receptor survey will be performed as part of the site investigation The purpose of this survey will be to evaluate potential health risks associated with the existialg hydrocarbon plume The survey will include evaluation of the following 1) sensitive receptors in the immediate area of the site, including presence of schools, hospitals, or other facilities that may utilize groundwater for water supply, and nearby surface water bodies within 112 mile radius of the site, 2) well search of records at the Department of Water Resources (DWR) in Sacramento to determine the existence of nearby water supply wells, and local groundwater use All wells within a % mile radius of the site currently on file at DWR wall be documented, 3) location of possible contaminant conduits into, through, and out of the site, as well as near the site (utilities, pipelines, etc ), 4) research of other potential nearby offsite sources Well Surveying. Upon completion of well construction, the wells will be surveyed by a licensed surveyor for elevation relative to mean sea level Groundwater gradient will be interpreted utilizing wellhead elevations and depths to water • Report. A report will be prepared after completion of necessary field work The report will include boring logs, well location map, soil and groundwater analytical results, a groundwater contour map, chain-of-custody documentation, and summary of findings Field and laboratory procedures are presented as Attachment A SCHEDULE PEG is prepared to initiate field work within two,weeks following approval of this workplan and the issuance of necessary permits by the San Joaquin County Public Health Services Department and the completion access agreements with City of Lathrop A report documenting the findings of the investigation is anticipated to be submitted approximately 8 to 10 weeks after commencement of all field work • 911 005 1131W AN