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RPfrENDIX A <br /> FIELD PROCEDURES <br /> SITE ItIVESTIGATION PROCMIRES <br /> the site investigation program consisted of exploratory drilling, <br /> soil sampling, observation well installation, field chemical analysis <br /> of �Qil samples, and water sampling. the procedures are described <br /> below. <br /> E.<ploratur•y,[Ir 11.1 irrq_dnci_C1_e.aning.Procedures <br /> All borings were drilled using clean eight-inch diameter hollow-stem <br /> auger or six-inch diameter continuous-flight auger drilling equipment <br /> and were logged by a PACIFIC geologist using the Unified 5011 <br /> Classification System and the Subsurface Investigation Activity Guide <br /> (Exhibit E) provided by Shell oil Company. Boring logs are included <br /> in this Appendix. <br /> Between soil sampling events, the sampler was triple-rinsed, first in <br /> clean water, then in detergent, and finally in clean water. Between <br /> borings, the sampler received a fourth rinse with organic-free <br /> water. Also, between borings, all augers were steam cleaned. <br /> Sol 1. 5a1 i ng <br /> Soil samples for logging and laboratory analysis were collected <br /> whenever possible at approximately S-foot depth intervals by <br /> advancing a California-modified Split-spoon sampler with clean brass <br /> liners into undisturbed soil beyond the tip of the auger. The <br /> split-spoon ampler was driven a maximum of 14 inches, using <br /> hydraulic pressure instead of the usual 140-pound hammer. The hammer <br /> was not used because heavy rains prior to the field investigation <br /> saturated the hammer rope and rendered it unsafe. <br /> After the sampler was withdrawn from the borehole, the amount of <br /> sample recovery was noted on the logs, and the brass liners holding <br /> the soil samples were removed. Up to two of these liners from each <br /> sample interval were wrapped in aluminum foil and chilled for <br /> possible laboratory analysis. Samples selected for laboratory <br /> analysis were sealed in glass jars, labeled, logged onto <br /> chain-af-custody forms, and stored on ice for transport. Another <br /> portion of the sample was retained for the field chemical analysis, <br /> described below, <br /> �1e31 Canstri�ction / Exploratary_Barin AfJandonmert <br /> -- <br /> Boring S-1 was advanced approximately 10 feet into ttic water= caring <br /> zone, taking care not to fully penetrate a 5-foot-thick aquitard. <br /> l00-11 .01 <br />