Laserfiche WebLink
Mr. Mike Souza <br />Page 2 of 2 <br />Groundwater samples collected from the excavation also had a strong petroleum hydrocarbon odor; however, no <br />sheen was observed on the samples collected or on the groundwater present within the excavation. The excavation <br />was subsequently filled to approximately two feet below ground surface with pea gravel by Thorpe and secured with <br />portable fencing. <br />Observations of tank condition are recorded in the Tank Removal Soil Sampling Report included as <br />Attachment A to this letter. The tanks were transported by Thorpe under Bill of Lading to Schnitzer Steel in <br />Rancho Cordova, California. Wastewater generated during rinsing of the USTs was removed and transported <br />by American Valley Waste Oil (CAL 00827878 under hazardous waste manifests 20958403 and 20958419 for <br />disposal. <br />Under the direction of PHS/EHD personnel, two soil samples were collected beneath the western and eastern ends of <br />each respective tank at depths of approximately 12 feet below grade. One groundwater sample was collected below <br />the center of each tank, and four discrete soil samples were collected from the soil stockpile. Soil and groundwater <br />sample locations are shown on the site sketch in Attachment A. <br />The samples were placed into an ice chest cooled to a temperature of approximately four degrees centigrade and <br />transported under chain of custody to Argon Laboratory (FLAP 2359) for analysis. Analysis for each sample <br />consisted of total petroleum hydrocarbons as gasoline (TPHg) and total petroleum hydrocarbons as diesel (TPHd) by <br />EPA method 8015 modified; benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA method 8020, gasoline <br />oxygenates by EPA method 8260, and total lead by EPA method 6010. Analytical results are summarized in Table <br />1, Attachment A. Laboratory data sheets and chain of custody documentation are included in Attachment B. Load <br />tickets for fill material, and documentation of UST and wastewater disposition will be forwarded under separate <br />cover by Thorpe. <br />Please call John Lane or Sean Garvey at (209) 838-9888 if you have any questions or require additional information. <br />Respectfully, <br />Ground Zero Analysis, Inc. <br />Sean Garvey <br />Staff Geologist <br />Attachments <br />cc: Pat Riddle <br />Marty Thorpe <br />O:\I> m\cROUNDZEITHORPE\SSouza\Tank pull m.dw <br />