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Clayton <br /> EV4�uS)VNeE`TAL <br /> CO�SI,LI�VI♦ <br /> 4r former UST, from USTs upgradient of the subject site, and from the possible previous <br />{ - use of pesticides onsite. The soil and groundwater samples were analyzed by the <br /> f following methods: <br /> EPA Methot1503Q18015-8020, for gasoline luel and the volatile hydrocarbons <br /> benzene, toluene, ethylbenzene, and xylene <br />� dMe r <br /> SPA Method 41$.1 for total recoverable petroleum hydrocarbons (TFtPH) <br /> ti � y i J EPA Methods 8080 (soil) and 608 (water) for organochlonne <br /> py pesticides/polychlonnated biphenyls (PCBs) <br /> �A��'✓3�� i <br /> 3.2 SOII. SAMPLE ANALYTICAL,RESULTS <br /> pM; falb' 1` t Results of the laboratory analyses of the soil samples are summarized in Table 2 We <br /> compared soil sample results for TRPH to concentrations in the RWQCB's <br /> Recommendattons for the Evaluation and Invesugadron of USTs Table 2 reports only <br /> detected compounds. All other compounds for which analyses were conducted were <br /> Sir s 4 below analytical detection hmits. Notable compounds detected are discussed below <br /> } a , ate y • Concentrations of gasolene, toluene, ethylbenzene, and xylene to soil samples from <br /> yf the borehole for well MW-3, next to the old gasoline tank, exceeded LU <br /> guidelines. <br /> The concentration ofa TRPH was 250 ppm in a soil sample from MW-3. Although <br /> - � - x regiilat�i�acton levels are not set for TRPH specifically, when oil and grease <br /> n.i <br /> concentrations-exceed 400 parts per million (Ppm) the`RWQCB requires a <br /> soil/groundvrater investigation. The RWQCB developed the 100 ppm level to help <br /> s u <br /> prioritize'c'`ases;-notras¢g cleanup level. The level of cleanup is determined by <br /> assessing',the potential°for soil contamination to impact groundwater. <br /> a <br /> 4 3.3 GROUNDWATER ANALYTICAL RESULTS <br /> E �5k� s <br /> z F �{ '�. Table 3 summarizes analytical results and compares our findings to regulatory levels. <br /> Table 3 repo'r`ts only detected compounds. All other compounds for which analyses <br /> were candiicted were below analytical detection limits Notable compounds detected <br /> y are discussed below. <br /> r� ���� �'� • Groundwater samples,from MW-3 showed low levels of gasoline, ethylbenzene, and <br /> ityleiie. Theethylbenzene and xylene are below California DHS action levels The <br /> concentration af�gasoline in MW-3 was very low. Action levels are not defined for <br /> gasoline in groundwater. <br /> 17--; <br /> 4.0 EXCAYATION AND SOIL AERAnQN <br /> 6 Az <br /> Based on the results of analysis of soil samples from the borehole for well MW-3, <br /> Clayton recommended excavating and aerating the soil in and around the location of <br /> the removed gasoline :ank. Clayton was retained by Interland to supervise the <br /> qa; excavation and aeration of petroleum hydrocarbon-contaminated soil in the vicinity of <br /> MW-3 (Clayton Project No. 29531.00) <br /> r f, <br />