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SIAIE (r CAI i-RNIA—HEALTH AND WELFARE AGENCY GEORGE DEUKMEJIAN, Gomm, <br /> DEPARTMENT OF HEALTH SERVICES <br /> TOXIC SUBSTANCES CONTROL DIVISION <br /> NORTHERN CALIFORNIA SECTION <br /> 4230 POWER INN ROAD <br /> SACRAMENTO, CA 95626 <br /> (916) ]39-3145 August 12 , 1988 <br /> Fred Baumbach <br /> Valley Industries <br /> 1313 South Stockton Street <br /> Lodi, CA 95240 <br /> Dear Mr. Baumbach: <br /> This is to acknowledge receipt of the soil sampling plan prepared <br /> by Aqua Terra Technologies on behalf of Valley Industries. <br /> Although this plan represents some improvement over the previous <br /> submittal , we are disappointed that it fails to include <br /> information generic to all sampling plans. We are also concerned <br /> that three surface and three subsurface (core) samples are not <br /> adequate to characterize the vertical and horizontal extent of <br /> contamination. With these concerns in mind, we would like to see <br /> a more comprehensive, detailed plan developed. <br /> A possible alternative to assess the extent of contamination <br /> would be to establish a grid pattern and take samples at randomly <br /> selected points of intersection. A minimum of nine sampling <br /> locations should be identified. Discrete surface (0-611) and core <br /> (6"-12" and 1211-1811) samples should be taken at each location. <br /> In addition, three background sampling locations shall be <br /> identified. <br /> Information regarding a selected sampling strategy shall be <br /> detailed in a revised soil sampling plan. The following <br /> information shall also be included in the revised soil sampling <br /> plan: <br /> 1. A sample map depicting the sampling locations for all <br /> samples, including background samples. <br /> 2 . A written description of how surface and core samples <br /> will be obtained. <br /> 3 . A sample analysis strategy. As an example, you may <br /> wish to analyze all samples in the 0-611 , 611-1211 depth <br /> ranges and only analyze 1211-1811 samples at locations <br /> where 611-1211 sample results exceed background levels. <br /> This revised soil sampling plan shall be submitted no later than <br /> September 15, 1988 . <br />