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lit �t1 � ►!! � � <br />ENVIRONMENTAL <br />14 97,A I Tu s <br />Appendix <br />- [, STANDARD <br />., <br />COMPLIANCE SAMPLING <br />This document describes GHD's standard operating procedures for collecting compliance soil and <br />groundwater samples during underground storage tank (UST) facility removal and excavation. These <br />procedures ensure that the samples are collected, handled, and documented in compliance with California <br />Administration Code Title 23: Waters; Chapter 3: Water Resources Control Board; Subchapter 16: <br />Underground Storage Tank Regulations (Title 23). GHD's sampling procedures are also based on <br />guidelines contained in the California State Regional Water Quality Control Board Tri -Regional Staff <br />Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites dated <br />August 10, 1990. <br />The objective of sample collection during underground storage tank facility removal or excavation is to <br />evaluate surrounding soils. Excavated soils are typically screened using an organic vapor analyzer (i.e., <br />PID or FID) to determine the presence of petroleum hydrocarbons or other constituents of concern. <br />Additional soil samples may also be collected based on visual observations. The quantity and location of <br />samples will be based on governing regulatory requirements and field observations. <br />The soil samples are collected in steam cleaned brass or steel tubes from either a slide -hammer type <br />sampler or the bucket of a backhoe. When a backhoe is used, approximately three inches of soil are <br />scraped from the surface and the tube is driven into the exposed soil. Upon removal from the sampler or <br />the backhoe, the samples are trimmed flush, capped with Teflon sheets and plastic end caps, labeled, <br />logged, placed on ice or refrigerated, and transported under chain of custody to a State certified <br />laboratory. <br />Groundwater samples are collected using new disposable bailers and decanted into laboratory provided <br />containers, labeled, logged, placed on ice or refrigerated, and transported under chain of custody to a <br />State certified laboratory. <br />GHD I APPA 111109471 (2) 1 1 <br />