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AMERICAN [r ENVIRONMENTAL MANAGEMENT CORP. VAR Please Refer To: " AEMC Job No. 8026b-PE 3 March 1989 Mr. William Snavely Environmental Health Division San Joaquin Local Health District P.O. Box 2009 Stockton, California 95201 RE: HYDROGEOLOGIC ASSESSMENT AND TANK MONITORING PLAN FOR GOLD BOND BUILDING PRODUCTS, STOCKTON, CALIFORNIA. Dear Mr. Snavely: On behalf of Gold Bond Building Products, American Environmental Managgement AEMC) is pleased to submit to the San Joaquin Local Health District (SJLHD) the ollowing hydrogeologic assessment and tank monitoring plan fora 5300 barrel No. 6 fuel storage tank at Gold Bond Building Products, 800 West Church Street, Stockton, California. See the enclosed site location map, Figure 1. This assessment and monitoring plan was initiated in response to concerns presented to AEMC personnel by the Central Valley Reg�'onal Water Quality Control Board on September 20, 1988, after receipt of Gold Bond Building Products requested variance of California Administrative Code Title 23, Chapp. 3; subchapter 16, Article 4, Section 2641, "Monitoring Alternatives", Alternative No. 2, first proposed 14 July 1988. These concerns included the lack of available information on groundwater direction and hydraulic gradient in the vicinity of the 5300 barrel No. 6 fuel tank. Initial groundwater samples have now been taken to determine background water quality as well as to determine any possible groundwater contamination that could be occurring as a result of leakage from the tank. Based on the results of the sampling and the proposals contained in this letter, the SJLHD is requested to approve the variance. On January 6, 1989, three (3) piezometers were installed in the vicinity of the 5300 barrel No. 6 fuel tank at the Gold Bond Building Products site. See Figure 2 for the piezometer locations. Drilling operations were carried out by Spectrum Exploration Inc., Stockton, California. Using a hollow stem auger, each piezometer borehole was completed to a depth of approximately 30 feet. All boreholes were logged for changes in lithology, moisture content, color, and plasticity. Soil cuttings from the boreholes were also checked for any signs of contamination, such as odor and discoloration. See Appendix A for the drilling logs and for specific information on soils encountered. No contamination was evident in any of the soils encountered during drilling operations. The upper most water bearing unit was encountered during drilling operations at depths between 25.5 feet and 29 feet. All piezometers were constructed using 2-inch W. interior exterior flush threaded PVC schedule 40 casing and well screen. A.02 slot size was used for the well screen. Filter pack material consisted of No. 3 lonestar sand. A minimum of 2 feet of bentonite seal was placed on the filter pack using hydrated bentonite pellets. A cement grout slurry was used to fill the annular space from the top of the bentonite seal to the ground surface. A traffic rated box with a locking cap was placed over the piezometers. See Appendix B for specifics on well design. The piezometers were developed for approximately 1/2 hour apiece using a surge block and bailer. 9719 Lincoln Village Drim Suite 501,Sacrameto,CA 95827/(916)364-8872