SITE INFORMATION AND CORRESPONDENCE

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izo PUBLIC HEALTH SERVICES O.ppU' SAN JOA QUIN(;OUN-i Y JOGI KliANNA NID.,NI.P.I I. l utth Officer �4CiF' P.O. 13)x 2009 s (1601 East Hazeitc�n Avenue) 0 Stockton, Californiatifornia 95201 i5 (209) 468-3400 SEP 1 2 1991 COOPI PACIFIC COAST PRODUCERS P O BOX 880 LODI CA 95240 RE: Pacific Coast Producers IN REPLY REFER TO SITE CODE: 1378 32 Tokay Street Lodi, CA San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the Site Remediation update and proposed closure report dated July 11, 1991, submitted by Dufour Environmental and Resource Management and has the following comments. The data presented in the report was based on samples retrieved from the use of a hand auger. Information gained from hand augering as performed in this investigation may be used for screening purposes but the use of drilling and sampling methods that yield undisturbed soil samples and precise records of stratigraphy must be used when investigating the extent of contamination at a site where underground storage tanks were previously located. The most common and preferred method of drilling is with a hollow stem auger which allows sampling with the auger still in place, maintaining the integrity of the bore hole. A hand auger cannot prevent sloughing in the bore hole and subsequent sampling would be unacceptable. A truck mounted hollow stem auger drill rig provides the ability to use a California modified split-spoon sampler containing three, six inch long, two inch diameter brass tubes. This sampler can be driven 18 inches ahead of the hollow stem auger by a 140 pound hammer with a 30 inch drop in accordance with American Society for Testing and Materials (ASTM) methods. The blows required to drive the sampler at each six inch interval should be recorded in the boring log. Once the sampler is removed, the bottom tube should be sealed and labelled and placed on ice until it can be delivered under chain of custody to the lab for analysis. Soil in the top two sections should be used for soil identification and lab duplicates. Stratigraphic data and field observations should be noted on a log prepared for each boring/well. Samples should be collected at every five foot interval and at significant changes in lithology and at intervals of obvious contamination in order to develop a complete profile of soil contamination. Since this site is being placed in the Local Oversight Program (LOP), the LUFT Manual and Tri-Regional Guidelines will be used to evaluate the work performed at this site. (Copies of the Tri-Regional Guidelines and "Appendix A" are enclosed.) As stated in the Tri-Regional Hoard Staff Recommendation Appendix A, all work and reports which require geologic or engineering evaluation and/or judgments must be performed under the direction of an appropriately registered or certified professional. (See sections 6735, 7835, and 7835.1 of the Business and Professions Code.) Also Rule 415 of the Professional and Vocational Regulations is to be followed which states: "A professional engineer...registered or licensed under this Code shall practice and perform engineering...work only in the field or fields in which he is by education and/or experience fully competent and proficient." A Dklsilrrl nr Cm.fir raga in(:oWily Ilvallh I.ar•r•S,(njt •s