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ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Webe�te.Third Floor <br /> Wright R O. Box 38�ockton CA 95201-0388 <br /> Environmentipproved .� <br /> Hied 0 <br /> Services, InG�bonditions <br /> Construction ♦ Engineering ♦ R&SW 3.I7 4+a} by 2AO 2 <br /> March 15, 1999 2knw+AL. ive Ei�PEbiTm <br /> Q,t�r►.E�st dN <br /> [A CAVDC-S [.ouc4 <br /> Mr. Ron Rowe ew ach 4 To4S/vim bac TO <br /> San Joaquin County PHS/EHD 4�0 0t3c1kkwn14 c-0w6_L94JoCLuY1-,) <br /> 304 East Weber Street, Third Floor J_ R-P t �-� S�gm i r c ST S RIL <br /> Stockton, CA 95202 <br /> - - u 5 T� PR.�•l�vQav�c- . t� 1�wT <br /> Re: Comment Resolution—Work Plan, Excavation and Soil Management '"tom' 0V <br /> Nelson Ready-Mix Site, 22700 State Highway 99, Ripon, California � 6 <br /> Dear Mr. Rowe: pair <br /> Q.t�r�$`stZS � j <br /> pPofi�5 t.�aiE2. <br /> It was a pleasure to speak with you on Friday, March 12, 1999 regarding your conditional7��5� <br /> approval of the above-referenced work plan. Thank you for your thorough review and ,r4 <br /> constructive comments. This correspondence addresses the fallowing seven comments I <br /> outlined in your fax correspondence of March 10, 1999. �! <br /> ` <br /> 1. In order to expedite the public participation notification process, a one-pagesumm 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 /> n be shored on all four sides using <br /> Wright Environmental recommends that the excavatio g <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 t <br /> for TPH-as-diesel, TPH-as-gasoline and BTEX. <br /> 67 E. 10th Street ♦ Tracy,CA 95376 j <br /> 209.833.0758 ♦ Fax 249.832.5152 l <br /> wright@inreach.com Lic.X1651501 A-B HaWat A <br /> websit htip✓lhome.inreach.com/wright %J <br />