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San Joaquin County EHD <br /> May 16, 2005 <br /> Page 4 of 5 <br /> box (D 1-6.5), the two leach pits (P 1-3 and P24) and the one of the leach line samples (LL 1-3). <br /> Sample LL2-3, collected from beneath the eastern most leach line, contained TRPH at 50 parts <br /> per million (ppm) and bis(2-ethylhexyl) phthalate at 0.37 ppm. Analytical results are <br /> summarized in Table 2. A copy of the laboratory report is included in Attachment C. <br /> DISCUSSION OF RESULTS <br /> TRPH and bis(2-ethylhexyl) phthalate (DEHP) were detected at low levels in the soil sample <br /> collected from beneath the easternmost leach line. DEHP is a plasticizer commonly associated with <br /> PVC material. It was detected at a level well below the preliminary remedial goal (PRG)of 35 ppm <br /> established for DEHP by the U.S. EPA. No PRG has been established for TRPH. A copy of the <br /> pertinent page of the EPA's PRG October 2004 table showing the PRG for DEHP is included in <br /> Attachment D. <br /> The domestic well formerly used at the site is located more than 200 feet upgradient (southeast) <br /> from the septic system, and groundwater is expected at roughly 80 feet bgs. Regional groundwater <br /> flow is to the northwest. Because TPH and DEHP were detected at such low levels, groundwater is <br /> not expected to be impacted by these constituents. <br /> RECOMMENDATIONS <br /> Mr. Van Spronsen proposes to complete the following activities, based upon Ground Zero"s <br /> recommendations: <br /> 1. Submit a permit application to remove the septic tank. Although the tank has already been <br /> removed, Mr. Van Spronsen requested that Ground Zero submit the appropriate permit <br /> application for your files. A completed permit application and fee of $89 will be submitted <br /> under separate cover. Mr. Van Spronsen proposes to dispose of the concrete debris from the <br /> septic tank, which broke up during removal, along with other concrete debris that is routinely <br /> generated by his farming operations. 1' 4w A P 0 0 /tqK <br /> 2. Complete evaporation of the liquid waste in the temporary storage tank pursuant to the March <br /> 9, 2005 workplan prepared by Ground Zero. Rinseate from the septic tank will be evaporated <br /> and the resulting sludge will be tested for chemicals of concern and coliform, prior to spreading <br /> on the ground surface. <br /> G:\GROUNDZE\Berberian\SBreport.doc �` <br />