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fs <br /> PhAh4ps 66 Company Febru 27,2002 <br /> Circle K Store#1205,16470 Cambnd a Street LathropCA <br /> • Groundwater Monitoring Wells. Three to five groundwater <br /> monitoring wells will be installed at locations determined by the <br /> Geoprobe@) assessment Soil borings will be drilled using 8-inch <br /> diameter hollow-stem auger Upon completion of drilling, a 2-inch <br /> diameter groundwater monitoring well will be installed in each <br /> boring Groundwater is anticipated to be encountered at <br /> approximately 12-15 feet below ground surface (bgs) The wells will <br /> be screened from approximately 5 feet below ground surface to 10 <br /> feet below where groundwater is first encountered Field procedures <br /> for groundwater monitoring well installation are provided as <br /> Attachment B <br /> • Monitoring Well Development and Sampling. After installation, <br /> the monitoring wells will be developed by rigorously surging the <br /> wells over the length of the screen intervals and by purging <br /> approximately 10 casing volumes of water After well development, <br /> groundwater samples will be collected from the newly installed wells <br /> and sent under standard chain-of-custody procedures to a California <br /> State-certified laboratory The groundwater samples will be analyzed <br /> for TPHg using modified EPA Method 8015, BTEX and MtBE using <br /> EPA Method 8020, and fuel oxygenates by EPA 8260 Field <br /> procedures for groundwater monitoring well development and <br /> sampling are provided as Attachment B <br /> • Well Surveying. Upon completion of well construction, the wells <br /> will be surveyed by a licensed surveyor to a local benchmark relative <br /> to mean sea level The groundwater gradient will be interpreted <br /> utilizing wellhead elevations and depth-to-water measurements <br /> • Soil and Water Disposal Soil cuttings generated during drilling <br /> operations will be temporarily stored onsite and covered with plastic <br /> sheeting pending characterization and disposal Soil cuttings will be <br /> removed by Tosco's disposal contractor to an appropriate disposal <br /> facility Water generated during steam cleaning will be temporarily <br /> stored in DOT-approved 55-gallon drums pending transport by <br /> Tosco's disposal contractor to an appropriate disposal or treatment <br /> facility Soil cuttings and purge water drums will be temporarily <br /> stored onsite for approximately 4 to 8 weeks <br /> • Report. A report will be prepared after completion of necessary field <br /> work The report will include soil boring logs, soil and groundwater <br /> analytical results, chain-of-custody documentation, and conclusions <br /> TOSCO/12 05!W KPLAN 1205 <br />