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GR I B I Associates Geological and Environmental Consulting Services <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave.Third Floor <br /> P. O. Box 388,Stockton CA 95201-0388 <br /> Approved [vr <br /> Denied ❑ <br /> January 14, 2000 k j�Conditions: $cc <br /> San Joaquin County Public Health Services Date 12'I ?cxaD by <br /> Environmental Health Division I- $gyp r NAQ-6a n4J1br (be Fuu- sew <br /> 304 E. Weber Avenue, 3`d Floor XtA-S <br /> UAN <br /> Stockton, CA 95202 Z- A d.d �Lo OQ' ' 6.5 �"� `ms's Awti.t 3 ) <br /> Attention: Ron Rowe 3- yyti,rviwwwt df- <br /> 4 �o►�rn►vvo�S c3 <br /> 17.Ew►u W.Ex4)t_;b rook K440ZL.rt <br /> Subject: Workplan To Conduct Soil Boring Investigation Of <br /> Clarifier Area, 15700 South McKinley Avenue 4- � w�`r �W' "~`'� <br /> , California �6 ?�� ?0-W4-T111Lathro <br /> Lathrop, f14w&) I AT 5 t`16 <br /> GA Project No. 110-05-01 *gel- . <br /> Ladies and Gentlemen: 5• 0awce)o 'S AlW"V <br /> fri,2 Aatmm,6&T ?oW* <br /> dR y! r4o <br /> Gribi Associates is pleased to present this workplan on behalf of Scott Company, proposing to <br /> conduct a soil boring investigation of the clarifier area at 15700 South McKinley Avenue in Lathrop, i4 i wi Wu <br /> California (see Figure 1 and Figure 2). This-workplan proposes the drilling and sampling of OR AfPRoJ��- <br /> approximately eight soil borings at the site using direct-push coring equipment. The goal of this <br /> investigation will be to assess soil and groundwater quality adjacent to the clarifier,both for planning <br /> purposes for anticipated removal of the clarifier and to address regulatory concerns. <br /> SITE BACKGROUND <br /> Based on information provided to us by Scott Company,it is our understanding that: (1)During an <br /> investigation of the clarifier by Advanced GeoEnvironmental in October 1997, one boring, B-3, <br /> located immediately south from the clarifier, encountered 350 parts per million (ppm) of Total <br /> Petroleum Hydrocarbons as Gasoline (TPH-G), 10,000 ppm of Total Petroleum Hydrocarbons as <br /> Diesel (TPH-D), and 0.094 ppm of Tetrachloroethene (PCE) in soil at five feet in depth, with no <br /> detection of these constituents in a ten-foot soil sample and no groundwater sample collected; and <br /> (2)During an investigation of the clarifier by Dames&Moore in June 1998,one boring,B-9,located <br /> immediately south from the clarifier and west from previous boring B-3,encountered 0.082 ppm of <br /> TPH-D, with no detection of Volatile Organic Compounds (VOCs). Soils encountered in the <br /> clarifier area consisted primarily of sands and silts, and groundwater was encountered in B-9 at a <br /> depth of about eight feet below surface grade. <br /> It is our understanding that Scott Company is planning to remove the clarifier. In order to further <br /> assess hydrocarbon releases prior to removal of the clarifier, Gribi Associates recommends <br /> conducting a soil boring investigation using direct-push coring equipment. This investigation will <br /> include the drilling and sampling of approximately eight soil borings,with five borings sited in the <br /> 1350 Hayes Street, Suite C-14 0 Benicia 0 California 0 94510 0 Phone (707)748-7743 0 Fax (707)748-7763 <br />