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s <br /> GeolagwidTecFtnics Inc • Page 2 <br /> J M Equipment Co <br />' Morutormg Well Installation Work Plan <br /> Appendix A <br /> Project No 507 2 <br />' January 13,1997 <br /> 20 QUALITY ASSURANCE PROGRAM <br />' The following measures will be taken by Geological Technics Inc to ensure that a high quality study is <br /> conducted and that cross contamination does not occur <br /> 21: Equipment <br />' Soil borings may be drilled with a hollow stem continuous flight auger, owned and operated by a licensed well <br /> driller Soil samples may be collected using a 2 inch (i d) modified California split spoon sampler, or <br /> continuous coring device, lined with brass sample tubes <br />' 22 Boring Logs <br /> A detailed log will be made of the boring The information to be noted includes sample depths,blow counts if <br /> continuous coring devise is not used, horizons of detectable contamination (detected by field methods), soil <br /> classification utilizing the Unified Soil Classification System and sediment description (color, texture, <br /> composition,hardness,moisture content,and post-depositional changes that have occurred in the sediments) <br />' <br /> 23 Cross Contamination Prevention <br /> All sample equipment(split spoon sampler or core tube,brass tubes etc) and auger(drilling rod,drilling bits, & <br /> auger, etc)will be thoroughly cleaned before being used and between uses Wash water may be containerized <br /> in DOT approved 55 gallon drums, labeled, and stored on site until disposal can be arranged Plastic gloves <br /> 1 will be worn during sample collection and changed between the collection of all samples <br /> 24 Chain of Custody <br /> Chain of Custody (CofC) forms are legal documents used to track the handling of samples All dates, tunes, <br /> persons and their companies will be listed from the time the sample is collected to its ultimate disposal A <br /> CofC form will be filled out for all samples collected The CofC will be tracked to ensure sample integrity <br />' 25 Sample Analysis <br /> Soil samples will be analyzed for benzene, toluene, ethyl benzene and total xylenes (ETEX), EPA methods <br /> 8020, TPH-Gasoline by EPA method 50301LUFT and for total extractable petroleum hydrocarbons (TEPH) by <br /> EPA method 3540/8015 modified The analyses will be performed by Sherwood Laboratories of Hilmar, <br /> California State Certification 41400 <br /> 26 Data Reduction <br />' Analytical data will be integrated with the geological data gathered during field investigation Cross sections <br /> will be prepared to illustrate the stratigraphy and the distribution of soil contamination The cross sections may <br /> be used for interpreting the extent of contamination <br />' 27 Ground water Sampling Procedure <br /> Ground water sampling procedure is as follows Arriving on site the stainless steel submersible pump/stainless <br />' steel bailer is assembled and the sampling equipment prepared The wells are unlocked, opened, and depth to <br /> water is measured from the top of casing <br /> As a matter of procedure, the following actions are taken to evaluate the presence of floating product, or third <br />' phase contaminant material on the ground water If field evidence suggests that floating product may be <br /> present (i e, the well has a strong odor of hydrocarbons and gasoline is observed on the water meter probe), <br /> then either a bailer or product/water interface meter is used to measure the thickness of floating product on the <br />