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WN <br /> J <br /> Lambert Barnum <br /> November 24, 1990 <br /> — Page 2 <br /> Soil samples were collected at a depth of 7 feet using a hand auger and driven tube <br /> sampler. All soil samples collected for possible chemical analysis were capped with <br /> aluminum foil-lined lids, labeled and immediately placed in a chilled ice chest. Soil <br /> samples collected were analyzed in accordance with the FRP. <br /> All samples were labeled in such a manner as to maintain client confidentiality. A chain- <br /> of-custody form was initiated by the sampler and accompanied the samples to the analytical <br /> laboratory. This chain-af-custody form is presented in Appendix 1. <br /> The soil samples collected were delivered to Superior Laboratory in Martinez, California <br /> a State approved laboratory (Certification Number 319), for the type of analyses <br /> performed. All samples were analyzed in accordance with EPA SW-846 Methods 5030 and <br /> 8020 for benzene, toluene, ethyl benzene and xylenes(BTXE),by Standard Method 5520F <br /> for oil and grease, and Modified EPA SW-846 Method 8015 for total petroleum <br /> hydrocarbons (TPH). <br /> t✓ <br /> Monitoring Wells <br /> As proposed in the FRP each of the three monitoring wells installed at the Stan Mari Ford <br /> dealership will be sampled and the samples analyzed for purgeable halocarbon by EPA <br /> Method 601 on a quarterly basis for the period of one year. <br /> Each of these wells was sampled on November 25, 1990. Prior to sampling, each well was <br /> purged of three to five well volumes of water until specific conductivity and pH values of <br /> the water had stabilized. Each well was sampled using separate dedicated PVC bailers for i <br /> each well. Two 40 ml VOA vials were collected from each well and placed in a chilled <br /> ice chest until delivery to a certified analytical laboratcry. <br /> FINDINGS AND CONCLUSIONS <br /> Auger Borings <br /> T <br /> Results of analytical laboratory tests are presented in Table 1 and in Appendix 1. A total <br /> of-seven soil_.samples-were-analyzed-far-BTXE-and-oil-and-g ' g rease�- n le-composite---------- =--------- --- <br /> ' <br /> sample, comprised of six separate soil samples derived from the stockpiled soil, was <br /> analyzed for TPH as diesel. <br /> The soils samples collected manually by hand auger and driver-tube sampler were all <br /> .� collected from a dep,h of 7 feet below the surface. This was the maximum depth <br /> reachable using the hand auger. The average oil and grease concentration of 397 mg/kg <br /> for the five auger hole samples is suspected of being artificially high due to the augering <br /> :i <br />