SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

�I Florsheim/Grupe/SJ County page 2 it 4 Groundwater samples were taken and EPA Methods 602, 608, 624, and 625 were utilized on selected samples utilizing various detection limits. No analytes were detected in the groundwater samples. 'a On June 29, 1994, Envirometrix Environmental Consultants of West Sacramento, California submitted a work plan to investigate a farm underground storage tank(UGT) that was;{removed in 1987. The non- petroleum constituents (DDT, DDD, DDE and Dieldrin) that were discovered in the 1989 investigation were not mentioned in the history of the site and the scope of work1did not include any pesticide or fertilizer investigation or remediation. ; On July 5, 1994, PHS-EHD issued a boring permit after approving the work plan to investigate the possible impact of the farm UGT. The"Soil Investigation Report", dated July 8, 1994 and submitted to PHS-EHD by Envirometrix on July 12, 1994, indicated that both soil and groundwater grab samples were non-detect for all BTEX, TPH-Gasoline and Diesel, and Motor Oil constitu°ents. PHS-EHD made no i comment on the report and did not issue a closure or site certification letter for this"exempt" farm tank. I On April 8, 1996, Envircmetrix submitted a work plan to aver-excavate approximately 15 cubic yards of DDT, DDD, and DDE impacted soil that cumulatively exceeded Total Threshold Limit Concentration (TTLC) of 1.0 mg/kg. PHS-EHD would not review the plan until the 1989 Levine-Fricke report was received and reviewed. On April 18, 1996, PHS-EHD received the report detailing the pesticide ini►estigation undertaken by Levine-Fricke in 1989. DDT related compounds exceeded TTLCconcentrations (1.0 mg/kg) at sample location"Q-1"at 1 foot below ground surface. The work plan to over-excavate is aimed at removing the 2.73 mg/kg found at this location. Dieldrin was also detected at 0.13 mg/kg at approximately one foot below ground surface in sample point"Q-3", but is not a constituent that the work plan is targeting to remove based on the TTLC for Dieldrin of 8.0 mg/kg. { It should be noted that no sample that exceeded TTLC values from the 1989 investigation was analyzed for solubility using the Waste Extraction Test(WET)guidelines. ; I This most recent revised work plan now calls for removing approximately.50 cubic yards of DDT impacted soil from the previous sampled areas around"Q-1" "Q-2" "Q-3", and "Q-6". Up to 11 soil samples are proposed to be collected and analyzed for EPA Method 8080. Confirmation side-wall and bottom samples that exceed the TTLC�of 1.0 mg/kg will be re-excavated until all soils tested are less than the TTLC for DDT related compounds. PHS-EHD will be onsite during soil sampling and direct sampling locations as site conditions dictate. Soils determined to be less than the TTLC may be left in place, but the responsible party desires to remove all soils that exceed 0.1 mg/kg and test all.these samples for solubility as per WET guidelines. PHS-EHD has advised the responsible party's consultant that due to a ten-fold dilution of { the soil sample during the solubility testing, samples that are less than 1.0 mg/kg will not be above the { Soluble Threshold Limit Concentration (STLC) of 0.1 mg/I, and STIIC tests are not required to be run. Prior to transport, excavated and stock-piled soils will be tested ani+I verified to be non-hazardous or will be transported under hazardous manifest by a certified hazardous waste hauler to an appropriate facility. ` PHS-EHD will require additional soil samples in the area of"Q-1" and"Q-6" in six(6) inch increments starting at 1.5 feet below ground surface, and continuing to 2.5 feet below`ground surface. These i samples are to tested by EPA Method 8080 at a detection limit that will verify if cumulative levels exceed ' the TTLC value of 1.0 mg/kg. A grab water sample is to be collected at the area of"Q-1" and analyzed for Organo-chlorine utilizing EPA Method 608 with a detection limit of 0.05 ug,/I. a�