SITE INFORMATION AND CORRESPONDENCE

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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY �o._�•.•coG Unit Supervisors Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. Director Mike Huggins,R.E.H.S.,R.D.I. -�' Al Olsen,R.E.H.S. Stockton, California5202 a -2708 Douglas W.Wilson,R.E.H.S. • �.. `P.• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. F ORS Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. BEN MARRACCINI Nov u � 1003 4636 E CHEROKEE RD STOCKTON CA 95215 RE: Tri-Plex Rentals UIC-Septic System Site Code:PR#:521963 4602,4604,4606 E.Cherokee Rd. RO#: 1523 Stockton,CA. 95215 San Joaquin County Environmental Health Department(EHD)has reviewed Work Plan:Septic System Remediation&Soil Testing dated October 22,2003 as submitted by Geological Technics Inc on October 27, 2003 and has the following comments. The plan includes the soil sampling requirements listed in EHDs October 17,2003 letter. The nine proposed GeoProbe borings/locations detailed in the plan are approved. Laboratory analyses listed in the work plan call for EPA Methods 8270C and 82606 for both soil and grab water samples. Previous laboratory analyses have included EPA Method 624, EPA Method 625,and "APHA/EPA"for Total Recoverable Petroleum Hydrocarbons(TRPH-1664). In order to confirm if the chemicals detected in the first analytical tests have migrated through the leach lines,the EPA Methods utilized in the first tests are to be utilized for samples collected during this next phase. Also included in the work plan(Section 2.1.1)was a Contingency Plan. This plan was a proposal to not collect soil samples (2)under the two separate septic tanks if EHD inspection of the interior of tanks indicated, "no cracks or holes are present in the walls of the tanks". In order to approve this sampling modification, EHD must visually inspect the vertical walls of the outside of both tanks and the soil immediately under and touching the bottom of the tanks to verify if seepage or a release from the tanks has occurred. Obviously contaminated soils discovered during this inspection of the tanks outer walls and bottom would require additional soil sampling collection and analyses. If you would rather expose all of the vertical walls of both tanks and a small portion of the soil immediately under each tank instead of angle boring to—1 to 2-feet under each tank,you should submit written confirmation of this option. Discussion in the work plan indicated that additional time(10 days)would be needed to secure the drilling permit and obtain approval for the cost of the work after EHD work plan approval. EHD strongly recommends that immediate steps be taken to pump out the septic tanks to ensure migration of chemicals to the leach lines is not allowed to continue. The plan to pump the tanks and contain,characterize,and initially treat the sewage onsite is hereby approved as submitted. With the biological portion of the waste neutralized by treatment with bleach in the onsite holding tank and the EHD visual inspection of the tanks successfully conducted and passed,you could finalize the costs and details for proper disposal of the residual chemicals left in the holding tank. Not discussed in the work plan was the potential sampling of the seepage pits if contamination was found under the leach lines. Should soil sample analyses indicate that the chemicals introduced into your septic system have migrated out from your leach lines,sampling below the seepage pits,as well as sampling of nearby drinking water wells,will be required. If you have any questions you may contact Michael Infuma at(209)468-3454. Donna Heran, REHS, Director Envir nmental Health art 7 nt Michael Infurna,Senior R HS Margare agodo, RE UIC-Site Mitigation Unit IV Supervisor c: Ray.Kablanow—Geological Technics,2741 River Rd, Modesto.