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ra <br /> PUBLIC HEALTH 'SERVICES ,oP �o <br /> s .G <br /> SAN )OAQUI\COIN <br /> X <br /> 10GI KHr.A AD:.NIRH. <br /> •; Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209) 468-3400 ^ - <br /> ;;DOUG WESTENHAVER <br /> AMERICAN FOREST PRODUCTS CO. <br /> .'4000 KRUSE WAY PLACE BLDG. 2 STE 355 <br /> LAKE OSWEGO OR 97035 <br /> RE: American Moulding and Millwork SITE CODE: 1882 <br /> 2801 West Lane <br /> Stockton CA 95208 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has reviewed the <br /> :;.Dames and Moore May 1992 report for the above referenced site. <br /> In this report Dames and Moore requests site certification and closure. Dames and Moore states that the <br /> former maintenance building area has been remediated becau-se all contaminated soil with a total petroleum <br /> hydrocarbon as diesel(TPHd)of 10,000 ppm-or greater has been rerpoved and the results of all the monitoring <br /> well analyses have been non detectable for.volatile organics and TPHd and total petroleum hydrocarbon as <br /> gas (TPHg). <br /> In April of 1988, 18 soil borings were drilled-to a depth of45 feet in order to determine the lateral and <br /> vertical extent of the soil contamination. (The location of SB-10 the most highly contaminated soil boring is <br /> not indicated in the report. Please identify the location of this boring in future reports). The zero line of the <br /> soil contamination was defined on the north side and southwest corner of the former maintenance building <br /> location. The lateral and vertical extent of soil contamination south of the former maintenance building has <br /> not been defined. <br /> The report states that in May of 1988 a 10,000 gallon diesel tank located on the west side of the maintenance <br /> shop and a 1,000 gallon waste oil tank located on the east side of the maintenance shop were removed and <br /> soil contamination was confirmed. Only contaminated soil demonstrating greater than 10;000 ppm TPHd was <br /> removed during an over excavation which was completed in July of 1990.The west excavation reached 22 feet <br /> below grade with TPHd confirmed at 4200 ppm. The east excavation reached a depth of 26 feet below grade <br /> with TPHd confirmed at 740 ppm. <br /> Dames and Moore targeted 10,000 ppm as an action level in their July 1988 Feasibility Study/Remedial Action <br /> Plan based on the 1986 Department of Health Services (DHS)Decision Tree Manual. However,DHS in an <br /> April 7, 1988 letter to Marvin Palmer of American Moulding and Millworks extended to the Regional Water <br /> Quality Control Board(RWQCB)and to the PHS/EHD the authority to provide oversight on the underground <br /> storage tank cleanup effort;thereby,focusing the cleanup action levels to those reflected in the RWQCB Basin <br /> Plan, the LUFT manual, and the Tri-Regional staff recommendations. <br /> Additionally, pursuant to Division 20, Chapter 6.7, Article 4, Section 25299.36 of the California Health and <br /> Safety Code,and the Underground Tank Regulations Title 23,Division 3, Chapter 16,Article 2,Section 2620 <br /> (c) of the California Code of Regulations (CCR)the cleanup of contaminated soil and groundwater resulting <br /> from a leak or unauthorized discharge from an underground storage tank or appurtenant piping may be <br /> directed by the local implementing agency or by the Regional Water Quality Control Board. PHS/EHD has <br /> determined that the ma�dinum allowable level of TPH-d.contamination that may remain in place without <br /> detriment to water quality'is 100 ppm. <br /> A Aivisinn of San Jmgwn County+Health Care Services <br /> S <br />