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� !•1' �..` .`�;�,t�,,�-- Mf ar'►s`sfi+��. "`P. 1-7u. ,.rw a .'�' --y!a •,�". u�,M.,t:' • q NO w` SAMPLENG METHODOLOGIES USED VN THIS PROJECT PRECAUTIONARY SOIL SAMPLING. This method consists of elective soil samples from areas proposed for construction, areas where underground tanks are to be installed, and areas from real property prior to real estate transactions. Briefly, this method consists of obtaining soil from a pre-determined depth and " a pre-determinated areal pattern, either by digging with a backhoe or through the use.of hand-augered or power-augered boreholes. When a backhoe is used to obtain the sample, the backhoe excavates a trench or pit to the required depth. Soil from the bottom of the excavation is then brought up in the backhoe bucket. A shovel or trowel is used to remove any soil from the surtace or wall that might have been included in the bucket. The sample is then taken by pushing or driving a brass sample liner into the newly exposed soil. The brass liner is then removed, the ends sealed, a label applied, and it is then put on ice for transportation to the laboratory. SAMPLE CONTAINERS Our firm uses new sample containers of the type specified by either EPA or the RWQCB for the collection of samples at sites where underground storage tanks are involved. Soil samples for volatile, semivolatile and nonvolatile analyses are all collected in properly prepared new brasE liners which are 2 inches in diameter by 4 inches in length. CIosure is accomplished with press fit plastic end caps which are fitted to the open ends of brass tube after a sheet of aluminum foil is wrapped over the exposed sample material. A non- contributing/noneubtractive tape is wrapped completely around the joint areas where the plastic caps meet the ouEer wall of the brass tube. No preservative other than cold storage .is used on samples captured in sample containers of this type. SAMPLE HMIDLING PROCEDURES Solid sample material is captured by advancing the liner into the soil. This may be done by pushing the liner into soft soils or by containing the liner in a drive shoe which can be advanced and then retracted by means of a slide hammer. The open ends of the sample liner are covered with aluminum foil and plastic and caps. Excess aluminum foil is removed and the edge of the plastic and caps is tightly sealed against the outer surface of the brass liner with an unbroken wrap made with a tape which has been tested to confirm that it does not contribute compounds that would be detected in the type of analyses intended for the sample contained inside of the brass liner. The grass liner is then labeled with the appropriate identification numbers which Specify the sampling activity designation number, sample collection arae; depth etc. that apply to that particular sample. The sample l�;.ier is th•::e placed in an ice cheat which contains pre-frozen blocks of an inert ice substitute such a Blue Ice or Super Ice. 5=:Hing Report 88288-C-1 VAN DE POL ENTERPRISES page 4