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GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan Groundwater samples will be collected with a Teflon bailer with bottom emptying device. Duplicate samples will be transferred to vials or containers that meet Regulatory Agency specifications (Table 1). Groundwater from the bailer will be transferred to the sample container by allowing the fluid to flow slowly along the sides of the vessel. All containers will be filled above the top of the opening to form a positive meniscus. No head space should be present in the sample container once it is sealed. After the vial is capped it will be inverted to check for air bubbles. If bubbles are present the sample will be discarded and replaced. If it is not possible to collect a sample without head space,the problem will be noted on the field technician's sampling log. Immediately following sample collection, samples will be labeled and stored in an ice chest containing frozen chemical ice sealed in plastic bags. Sample labels will contain the following information:date,time,project ID,sample ID,and name of sampler and type of analysis. All samples will be transported under chain of custody protocol to a state certified laboratory within 24 hours. A sample container filled in the laboratory with organic free water and carried unopened during the sampling trip will also be provided(Trip Blank). A "high-low" temperature recording thermometer will accompany sample shipments to ensure proper sample temperature maintenance. Samples will be transported either by Ground Zero Analysis (GZA)personnel or by private courier. Analytical holding times will be considered in determining sampling and shipping schedules. Friday shipment/Saturday laboratory receipt of samples will be coordinated in advance with the laboratory. 10.2 Direct Push Borings Groundwater samples obtained using a direct push method,sampling will be conducted in accordance with ASTM Standard Guide for Direct Push Groundwater Sampling for Environmental Site Characterization(ASTM D6001 —05). Groundwater samples may be obtained using a CPT rig. In this case when the pore pressure dissipation test indicates that groundwater has been reached, the CPT tool will be withdrawn and a sample collected using a hydropunch in accordance with ASTM D6001. CPT testing will conducted in accordance with the Standard Practice for Using the Electronic Piezocone Penetrometer Tests for Environmental Site Characterization(ASTM D6067— 10). 11.0 INDOOR AIR SAMPLING Indoor air sampling will be conducted in accordance with the procedures specified in the document Final, Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (DTSC, October 2011). G:\Data\GROUNDZE\STALLWORTH AUTO SALES(N CA)1380\Workplan\QA.QC Plan.docx 10