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`� SEZVICESPUBLIC HEALTH �o <br /> SAN JOAQUIN COUNTY 2' i <br /> JOGI KHANNA M.O.,M.P.H. <br /> Health Officer P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,Califomia 95201 <br /> CqC/FO�a` <br /> (209) 468-3400 <br /> BOB ROBINSON <br /> DOANE PRODUCTS COMPANY <br /> P o BOX 879 Py MAR 2 6 1992 <br /> JOPLIN MO 64802 <br /> RE: Doane Products SITE CODE: 2441 <br /> 450 East Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed review of the submittal dated <br /> February 17, 1992 entitled "Report of Soil Remediation" prepared <br /> by Brunsing Associates and has the following comments for your <br /> consideration. <br /> As suggested in the PHS/EHD letter dated November 18, 1991 an <br /> additional monitoring well will be necessary not only to <br /> characterize groundwater contamination but to verify groundwater <br /> gradient as the third monitoring well, P-1, was destroyed during <br /> the December re-excavation. <br /> The January 17, 1992 sampling of monitoring wells MW-1 and P-2 <br /> did not indicate groundwater contamination. However, the December <br /> 11, 1991 water sample taken from the excavation pit following re- <br /> excavation did detect 72 ppm TPH-diesel contamination. Therefore, <br /> please continue quarterly sampling of MW-1 and P-2 to monitor the <br /> possible migration of groundwater contamination. The next <br /> quarterly sampling should be scheduled by April 17, 1992. <br /> Approximately 1100 cubic yards of contaminated soils were removed <br /> between December 9 through December 11, 1991. This soil is <br /> stored on-site and covered with plastic. Periodic maintenance is <br /> necessary to ensure that the plastic cover remains intact <br /> preventing stormwater contact with the stockpile thereby leaching <br /> contaminates. <br /> Recommendations and conclusions are essential components of <br /> reports. As submitted, the "Report of Soil Remediation" is <br /> incomplete. Recommendations for the disposal and/or remediation <br /> of the stockpiled soil and for the mitigation of residual soil <br /> contamination, 40 ppm TPH-diesel, which remains at the conclusion <br /> of the re-excavation, were not included. The recommendation for <br /> mitigation should be included, along with a soil disposal plan, <br /> as an Addendum to the "Report of Soil Remediation" due May 15, <br /> 1992 . <br /> A Dh4sion of San Joaquin County Health('arc Services <br /> i <br />