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MSOO <br /> August 14,2007 <br /> Mr.Harlin Knoll <br /> Public Health Services of San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, CA 95202 <br /> Re: Continental Grain Co. (ContiGroup)Penny Newman Elevator <br /> 1805 Harbor Street <br /> Stockton, CA 95203 <br /> Site Code 1132 <br /> Corrective Action Completion—Route to Closure Discussion <br /> Dear Mr. Knoll: <br /> Huff& Huff, Inc. on behalf of ContiGroup Companies, Inc. would like to expand upon our letter to <br /> Margaret Lagorio dated January 4, 2007 per the information obtained from the teleconference on <br /> May 3, 2007. The teleconference included representatives from San Joaquin County—Environmental <br /> Health Division (Mr. Harlin Knoll and Ms. Margaret Lagorio), representatives from Huff& Huff <br /> (Jim and Linda Huff), and representatives from ContiGroup Companies, Inc. (James Taylor and Dan <br /> Decker). Specifically we are looking to obtain written concurrence with the additional site <br /> investigation activities that were discussed in the May 3, 2007 teleconference. <br /> Additional site investigation activities include: <br /> 1. The vertical and horizontal extent of TPH diesel in the soil and groundwater must be defined. <br /> Based upon San Joaquin County—Environmental Health Division review, additional information <br /> is needed to complete delineation: <br /> a) Boring SB-12 provides vertical delineation at a depth of 50 feet. Therefore,no <br /> additional vertical delineation is proposed by H&H. <br /> b) Step out from MW-7 and MW-4 in a northeasterly direction and place a monitoring <br /> well with screen depth of 35 feet or greater to define the lateral extent in the <br /> north/northeast direction. <br /> c) Define eastern extent near HA-2. Soil contamination was detected in this boring but <br /> there is no monitoring well east of MW-3. This well should be screened similarly to <br /> MW-3, i.e. 25 to 35 feet, and possibly a little deeper(MW-3 is screened from 8 to 28 <br /> feet below ground surface). <br /> d) Based on the results in MW-5,taken in conjunction with soil sample results from <br /> SB-8 and SB-9, indicate the TPH plume is defined to the southwest. Therefore, no <br /> further delineation is proposed in this direction. <br />