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Mr. Martinez Page 2 February 3 , 1989 <br /> SITE INVESTIGATION <br /> Previous site investigation was completed by ,Tim Thorpe Oil , Inc. and <br /> canonie Environmental Services Corp. The Thorpe work is documented <br /> in a report entitled "Reconnaissance Environmental Assessment" dated <br /> March 2 , 1988, and the Canonie sampling results are documented in a <br /> letter to Mr. Marty Thorpe dated March 25, 1988 . <br /> After review of these documents it appears that traces of Total <br /> Petroleum Hydrocarbons (TPH) were found at 4 feet (1 .9 ppm) and 7 <br /> feet ( 22 ppm) between the fuel dispensers and pump house as shown on <br /> the attached Figure. The fuel dispensers, pump house and concrete <br /> slab where the above ground tanks were located have been removed from <br /> the property since the sampling was completed. Additionally, the <br /> sampling results were reported to Thorpe after their report was <br /> submitted to California Fuels, therefore there is no mention of the <br /> results in the March 2 report. <br /> RECONMENDATI ONS <br /> Due to the unknown extent of the TPH contaminants which were reported <br /> at the site, a soil gas investigation is recommended. A soil gas <br /> investigation involves the insertion of a probe into the soil , <br /> sampling gas at prescribed intervals from the probe, and analyzing <br /> the sample with a gas-chromatograph onsite. The sample may be <br /> analyzed for a wide variety of constituents. <br /> It is proposed to sample under and adjacent to the areas where the <br /> tanks, pump house and dispensers were located as shown on the <br /> attached Figure. Sampling locations will be on a 20 foot grid (see <br /> attached Figure) , and samples will be taken at five foot intervals to <br /> a depth of 15 feet or to groundwater, whichever is encountered first. <br /> 31he samples will be analyzed for Total Hydrocarbons. Sampling will <br /> be stopped after a clean sample is analyzed. If impacted soil is <br /> encountered to a depth of 15 feet, or to groundwater, sampling will <br /> be stopped and an alternate site investigation workplan using bore <br /> holes and/or monitoring wells will be developed. <br /> The onsite investigation, with preliminary results, can be completed <br /> in approximately ten hours. A final report in accordance <br /> with state and local regulatory guidelines, which summarizes the <br /> findings, and includes recommendations and conclusions will be <br /> completed as part of the proposed work. <br />