Laserfiche WebLink
.......... <br /> dry <br /> a <br /> MAO <br /> Muth0dologlan and Conventions <br /> GENERAL PRACTICES WITHIN A MULTIPLE AGFNCY 11JERARCIly <br /> O.S. Environmental Protection Agency standordn nerve at the foundation for <br /> all field xampling operations performed b)- our firm. I'lit! UPA SW 04t; is the <br /> primary publication from which procedures are derived, though there are <br /> additional EPA sources such an training films and verbal communications. <br /> Snmpllng related to underground aturage tanks and tank rnInted threats to <br /> groundwater are governed by the California Water Rezourcas Control Board and <br /> their Regional Water Quality Control Boards. While some aspects of field <br /> and laboratory work =ay be delegated to the California Department of Health <br /> Services, the CWRCB and the nine kegional Water Quality Contrul Boards <br /> establish the general and specific criterl.-i for Sampling performed in <br /> connection with underground storagn tanks. This Is done through the <br /> publication of guidance documents, the Issuance of memoranda and verbal <br /> announcements. <br /> Other agencies, such an Air Pollution Control Districts, may require <br /> additional samples, but these are usually Lq #A41112n Lo samples required by <br /> the RWQCB. Local Implementing agency (LIA) Inspectors are frequently present <br /> during the tank removal Pht'Re Of a project and either direct or request that <br /> samples be taken according to RWQCB specifications. Adtfitional samples may, <br /> and frequently are, taken at the requetit or the LIA Inxpectur. <br /> Mused an field conditions directly observable by the LIA Inspector, our <br /> field personnel may be asked to collect Sumples that are tailored to the <br /> specific situation and which the Inspector judges will provide substantial <br /> information about the site. Quite often these directions or suggestions <br /> colricide with the sampling areas established by the RWQCB as the proper <br /> Collection points for samples which will be used as the Primary Criteria for <br /> a Regulatory Agency Determination on whether additional exploration or <br /> remediation will be required at a particular site. Similarly, there are <br /> Instancon when the LIA Inspector's Judgements do not coincide with Board <br /> Spec If icn tions. <br /> Two common examples of this are as follow&: <br /> 1. A local implementing agency Inspector notes that soil dug up ft-om the <br /> correct RWQcu Interface sampling point Is relatively clean, but observes that <br /> there im quite Obviously contaminated backfill underlying the center of the <br /> tank. The insr^-ctor directs that the contamitiated backfill should be taken <br /> inste.al or tlift clean interface soil so as to provide Information about the <br /> worst cilne" conditions within the trink pit. <br /> Z. The boil-tit thok specified-in terfactr-sampling--drpth--It,-found-to <br /> contiominlited, but much fags so than the soil only a few Inchon above. <br /> Noting <br /> Sampling Report 88057-C-1 Chevron 1918 . <br /> SECTION TWO/page 7 <br />