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Joe Lentini - 2 - 11 August 2010 <br /> Shell Mountain House <br /> The Second QMR describes groundwater sampling conducted for a fourth consecutive quarter <br /> in June 2010. Depth to static groundwater ranged from about 27 to 36 feet bgs. Groundwater <br /> flow generally varied between the northwest and northeast at gradients that ranged from 0.002 <br /> to 0.006. Groundwater samples were submitted for laboratory analysis of TPH as diesel <br /> (TPHd), TPH as crude (TPHc), BTEX, and naphthalene. No TPHc, TPHd, BTEX or <br /> naphthalene was detected in any of the groundwater samples obtained from Neighborhood B. <br /> There were a few TPHd detections in Neighborhoods C and D that were below the water <br /> quality objective of 100 micrograms per liter (Ng/L). Overall, the second quarter monitoring <br /> results were consistent with results observed in previous quarters. <br /> Soil vapor well SVP-1 was sampled during the week of 12 July 2010. Results will be provided <br /> in the third quarter monitoring report. <br /> Our comment is presented below. <br /> The monitoring results observed over the past four quarters indicate that it is appropriate to <br /> contemplate no further action (NFA) for the Site. Therefore, please submit the results of the <br /> SVP-1 monitoring in the Third QMR. If the results of vapor sampling are ND and third quarter <br /> groundwater monitoring results are consistent with previous quarters, Shell may submit an <br /> NFA Report. This Report must include summary tables of all soil, soil gas, and groundwater <br /> data generated for the Site and the rationale for the NFA request. Staff will review this Report <br /> and determine if NFA status may be granted. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4665 or by <br /> email at betaylor@wate[46ards.ca.gov. <br /> BRIAN TAYLOR, G. <br /> Engineering Geologist <br /> cc: Mr. Jeff Gaarder, Conestoga-Rovers & Associates, Sonoma <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Manuel Oliveira, Escalon <br /> Ms. Joanne Kimbrough, Tracy <br /> Mr. Nader Shareghi, Mountain House Community Services District, Mountain House <br /> Mr. David Wood, Murphys <br />