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0 0 <br /> 13731 North Highway 88,Lodi Project 07123A <br /> July 25, 2007 <br /> Page 2 <br /> The regional groundwater flow generally follows the topography, moving from areas of higher <br /> elevation to areas of lower elevation. Based on regional topography, the groundwater gradient is <br /> estimated to be to the southwest following the topography. However, due to the extremely flat <br /> nature of the surrounding area, the flow gradient is expected to be highly variable and largely <br /> dependents on agricultural pumping rates and seasonal fluctuation. There is no information in <br /> regards to depth to first groundwater in the vicinity of the Property. <br /> PROPOSED SOIL BORINGS <br /> ERAS proposes one soil borings for collection of one soil sample and one groundwater sample (if <br /> encountered). The boring will be advanced through the former tank pit. The location of the boring <br /> is shown on Figures 2 and 3 of Attachment A is located through the former tank pit. The soil <br /> boring will be advanced approximately 4 feet into native soil beneath the pit fill material. The soil <br /> boring will be advanced as 2.5 inch diameter core to approximately 12 feet bellow ground surface <br /> (bgs). Soil will be continuously cored for lithologic logging. One soil sample from the vadose zone <br /> will be collected and one groundwater sample will be collected if groundwater is encountered and <br /> analyzed for contamination that may have leaked from the fuel pump or UST. The soil will be <br /> screened in the field using a photo-ionization detector, and based on the field screening the soil <br /> sample from the boring will be selected for submittal for laboratory analysis. The Standard <br /> Operating Procedures for soil and groundwater sampling with a direct-push rig are attached as <br /> Attachment S. <br /> SAMPLE ANANLYSIS <br /> All soil and groundwater sample will be submitted to a California State-certified Environmental <br /> Laboratory under chain-of-custody procedures. The samples will be analyzed for total petroleum <br /> hydrocarbons as diesel (TPH-d) by EPA Method 8015with silica gel clean-up. <br /> REPORT <br /> A brief letter reportwill detail the field procedures, present the results of the investigation including <br /> laboratory reports and boring logs,and interpret the data with respect to the RWQCB Environmental <br /> Screening Levels (February 2005). <br /> If you need additional information please call me tt510) 47-9885 or e-mail to gail@eras.biz <br /> gEDi <br /> Sincerely, <br /> ERAS Environmental, Inc. q�C� J0yUEd'� 1\ <br /> Jyam -_✓ 'k NO 5725 <br /> Gail M. ]ones, RG 5725 <br /> Senior Geologist <br /> OF CA1. <br />