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Z; ENVIRONO"'NTAL HEALTH DIVISION <br /> 304 E. Weave. Third Floor <br />' Wright P. O. Box 388, Stockton CA <br /> 95201-0388 <br /> % Environmen4[pr6ve1 .e1 <br /> hied 0 <br />+ Services,'Inv�onditions - �} <br /> Construction ♦ Engineering ♦ R5iWafliOn 1]y 2 <br /> l . Ff�L fhPt2ddt�- NTS <br /> March 15, 1999. i2AMouAL- r-oe' t-f-PEDi`E <br /> • 2r��t��xil .�N cwbEs co�tt�vTuA-c.. <br /> Mr. Ron Rowe ew acfi 4 ms/otb bu 6 Tn <br /> San Joaquin County PHS/EHD 4.0 tW4044Aq LOA611Vfok-iuY0 P06Y4�' * <br /> 304 East Weber Street, Third Floor a- iT Su 8m titT - <br /> Stockton, CA 95202 <br /> Re: Comment Resolution—Work Plan,Excavation and Soil Management <br /> Nelson Ready-Mix Site,,22700 State Highway 99, Ripon, California Pti✓ <br /> Dear Mr. Rowe: POTE)"nAt- " <br /> �� <br /> It was a pleasure to speak with-you on Friday, March 12, 1999 regarding your conditiona 7g <br /> :approval of the above-referenced work plan. Thank you for your thorough review and ,P4 �m� <br /> constructive comments: This correspondence addresses the following seven comments <br /> outlined in your fax correspondence of March 10, 1999. <br /> 1. In order to expedite the public participation notification process, a one-page summary of <br /> the goals, processes and potential hazards associated with the proposed work is attached. <br /> 2. After consulting with a shoring contractor and a visit to the site with the contractor, <br /> Wright Environmental recommends that the excavation be shored on all four sides using <br /> slide-rail E&S linear shoring. To facilitate the installation of-this shoring system and to <br /> reduce cost,the width of the excavation will be reduced from 25 feet to 20 feet. This <br /> reduction in excavation area will not significantly sacrifice the remedial efforts. <br /> Incorporating excavation objectives-and site and subsurface logistical conditions, the <br /> shoring system and excavation will be designed and certified by a state of California <br /> registered civil engineer. <br /> 3. Groundwater pumped from the excavation will be stored in a rented water storage tank <br /> for temporary storage on site. All of the pumped water will be discharged.into the first <br /> water storage tank for sediment collection and control. Additional water tanks will be <br /> used, if needed. Once the de-watering is complete, any separate-phase diesel will be <br /> removed with floating absorbant pads. The remaining liquid will be sampled and <br /> analyzed for Total Petroleum Hydrocarbons (TPH)-as-diesel; TPH-as-gasoline, benzene, <br /> ethylbenzene, toluene, and xylenes(BTEX). Based on the results of the analytical ! <br /> testing, a carbon filtration system will be designed to treat the water prior to sewer <br /> discharge. To confirm that the discharge has been effectively treated, effluent water � <br /> samples will also be collected for analysis. 'Effluent water samples will also be analyzed <br /> for-TPH-as-diesel, TPH-as-gasoline and BTEX. <br /> 67 E. 10th Street ♦ Tracy,CA 95376 <br /> 209.833.0758 ♦ Fax 209.832.5152 <br /> wright@inreach.com Lic. #651501 A-B HaWai <br /> websit hup://home.inreach.comhvright <br /> a <br />