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these periods a measured volume of air was drawn over activated charcoal to <br />extract volatile organic materials. The samples were submitted to the <br />Fireman's Fund Laboratory in Petaluma, California for analysis of benzene, <br />toluene, and xylene (BTX). Normal turn-around on analyses is two weeks, <br />however, two of the analyses were expedited (24 hour turn-around) to allow <br />an assessment of future air sampling requirements. The analyses from this <br />sampling will be discussed in Section 4.5. <br />3.4 Surface Water Sampling <br />Samples of surface waters were collected by MARK personnel on March 3 <br />from. Whiskey and Trapper Sloughs in the general area of the Marina (See <br />Drawing 6). Samples of both surface and subsurface water (6" to 1-foot in <br />depth) were collected in this area to assess whether product was present in <br />slo.igh waters after the installation of booms designed to prevent the <br />migration of product into the Marina waters. The samples were seat to <br />Brown and Caldwell's laboratory in Emeryville, California for analysis of <br />total hydrocarbons and BTX. <br />3.5 Groundwater Sampling <br />The twelve existing wells at the site (Drawing 2) were inspected and <br />numbered by MARK. One set of groundwater elevations and product <br />thicknesses was measured on March 4, 1986. The wells were also purged (2 <br />to 15 casing volumes) and water samples were collected over the course of <br />three days. The volume of water purged was related to the recharge <br />capabilities of the well to recover after purging. The samples were sent <br />to Brown and Caldwell's analytical laboratory under chain-of-custody <br />procedures for analysis of total petroleum hydrocarbons (TPH), benzene, <br />3-3