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z ° - <br /> San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton , California 95202-3029 <br /> fit. ��.,i" � � PROGRAM COORDINATORS <br /> - - Carl Borgman, REHS <br /> cd . <br /> Huggins, REHS, RDI,��P Website: www.sfgov. org/ehd Mike <br /> lr F o FMargaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464=01138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> DAVID GUARDINO AND PAT GUARDINO SEP 2 6 2007 T 6T <br /> GUARDINO AND CRAWFORD CONSTRUCTION <br /> 517 W FREMONT ST <br /> STOCKTON CA 95201 <br /> RE: GUARDINO AND CRAWFORD SITE CODE: 1112 <br /> 517 W Fremont St. <br /> Stockton CA 95201 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Well <br /> Installation and Feasibility Study Work Plan (WP) dated April 20, 2007, and site information <br /> prepared by your consultant, Advanced Geo Environmental, Inc. (AGE) . AGE proposes in the <br /> WP to install one ground water extraction (GWE) well (EW- 1), one soil vapor extraction (SVE) <br /> well (VW- 1), and one observation well (OBW- 1 ); and conduct pilot testing for GWE and SVE. <br /> The proposed location of VW- 1 is adjacent to boring P3 , an area of significant soil hydrocarbon <br /> contamination. However, MW- 1 appears to be more intensely impacted than P3 as shown by soil <br /> samples containing total petroleum hydrocarbons quantified as gasoline (TPH-g) at 15 feet below <br /> surface grade (bsg) at 990 milligrams per kilogram (mg/kg) versus 230 mg/kg TPH-g from P3 at <br /> 10 feet bsg. Based on this information, EHD recommends that VW- 1 be located closer to the <br /> apparent source of contamination, between MW- 1 and P3 , or nearer to MW-1 . <br /> The EHD is concerned with the proposed construction of OBW- L The proposed screen intervals <br /> are 5 feet to 15 feet bsg for VW-1 , 15 feet to 35 feet bsg for EW- 1 , and 5 feet to 20 feet bsg for <br /> OBW- 1 . The EHD recommends that two separate observation wells be installed having the same <br /> construction and are located reasonably near the well being tested. <br /> Submit a workplan addendum addressing these concerns and recommendations or a technical <br /> justification for the test design submitted in the work plan to the EHD by November 1 , 2007. <br /> If you have any questions, please contact Frank Girardi at (209) 953 -7868 . <br /> Donna Heran, REHS, Director <br /> E vironmental Health Department <br /> Frank Girardi, Senior REHS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: RWQCB, Central Valley Region — James L. L. Barton, PG <br /> c: Advanced GeoEnvironmental, Inc. — Jessica Rugge <br />