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M. Scott Mansholt - 2 - 21 November 2008 <br /> Chevron —Vernalis Pump Station <br /> 2"d Semi-Annual Groundwater Report <br /> • Petroleum hydrocarbons as TIP Hd was detected at 110 pg/L and non-detect (ND) for <br /> MW - 3 and 5, respectively. <br /> ■ MW - 4 was not sampled due to damaged well casing. <br /> • SAIC has proposed to prepare a human health screening evaluation (HHSE) prior to <br /> the submittal and request for a no further action determination for the Site. <br /> Central Valley Water Board staff has the following comments: <br /> • Depth to groundwater fluctuates and continues to increase. The reliability/quality and <br /> volume of groundwater collected for analysis is often compromised and/or groundwater <br /> is frequently not present. <br /> • There is adequate groundwater monitoring data and MW - 1 through 5 can be <br /> destroyed. MW -1 and 2 should be destroyed in accordance with the same workplan <br /> previously approved by Central Valley Water Board staff. <br /> • A HHSE should be prepared for the two onsite parcels and the offsite parcel associated <br /> with the former Vernalis Pump Station Site. <br /> By 1 June 2009, please submit the monitoring well destruction and HHSE reports. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> z; A, & OE6.c' <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geo ogist Engineering Geologist <br /> P.G. No. 6357 <br /> cc: Harlan Knoll, San Joaquin County EHD, Stockton <br /> James Simpson, Stanislaus County DER, Modesto <br /> Michael Jenkins, SAIC, Sacramento <br />