ARCHIVED REPORTS XR0000770 - Laserfiche WebLink

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fit Phillips 66 Company 4 Circle K Store#1205, 16470 Cambnd a Street Lathrop CA July 16 2002 Geoprobe borings, therefore soil samples will not be submitted to the laboratory for analysis • Monitoring Well Development and Sampling. After installation, the monitoring wells will be developed by rigorously surging the wells over the length of the screen intervals and by purging approximately 10 casing volumes of water After well development, groundwater samples will be collected from the newly installed wells and sent under standard chain-of-custody procedures to a California State-certified laboratory Groundwater samples will be analyzed for TPHg, benzene, toluene, ethylbenzene, xylenes, MtBE, DIPE, TAME, EtBE, TBA, 1,2 DCA,EDB, and ethanol by EPA Method 8260B, Single Run Field procedures for groundwater monitoring well development and sampling are provided as Attachment C • Well Surveying. Upon completion of well construction, the wells will be surveyed by a licensed surveyor to a local benchmark relative to mean sea level The groundwater gradient will be interpreted utilizing wellhead elevations and depth-to-water measurements • Soil and Water Disposal Soil cuttings generated during drilling operations will be temporarily stored onsite and covered with plastic sheeting pending characterization and disposal Soil cuttings will be removed by Tosco's disposal contractor to an appropriate disposal facility Water generated during steam cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport by Tosco's disposal contractor to an appropriate disposal or treatment facility Soil cuttings and purge water drums will be temporarily stored onsite for approximately 4 to 8 weeks • Report. A report will be prepared after completion of necessary field work The report will include soil boring logs, soil and groundwater analytical results, chain-of-custody documentation, and conclusions SCHEDULE SECOR is prepared to initiate field work within four weeks after the addendum to the work plan is approved, encroachment permits from the City of Lathrop, the soil boring and well construction permits can be obtained from the SJC-EHD, and a drilling company is scheduled A report documenting the findings of the installation of monitoring wells is anticipated to be submitted approximately four to eight weeks after the completion of the field work and upon receipt of all analytical data from the laboratory TOSCO/1205/WKPLAN1205 Addendum