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k. March 19, 1992 Harding Lawson Associates 19060, 025 . 03 Mr. Bud Good The Southland Corporation Page 3 �. calculations indicate a northeasterly hydraulic gradient, which is consistent with previous data for the site. RESULTS AND DISCUSSION The pH of purged groundwater monitored in the field was consistently between 6. 80 and 7. 88 . Conductivity measurements ranged from 390 to 1, 600 uS/cm. Results of groundwater analyses indicate increasing concentrations of benzene and total +- petroleum hydrocarbons in MW-1, MW-8 , and MW-9 from the previous quarter. Petroleum hydrocarbon concentrations in groundwater from MW-10 appear to have stabilized. All of the remaining wells had nondetectable concentrations of petroleum hydrocarbons. The "zero line" of the TPH results is shown on Plate 1. Detectable levels of fecal coliform were found in groundwater samples from MW-1, MW-3 , MW-4 , and MW-6 through MW- ` 11. In a letter dated December 10, 1991 from the SJCDPHS to the +r# Southland Corporation, the SJCDPHS requested the following activities take place during the fourth quarter: �„ • Stockpiled soil to the west of the store building be sampled to verify that the soil is not contaminated with petroleum hydrocarbons; ` 0 Repair the grout seals around the stove pipes of MW- 12, MW-13 , and MW-14 ; +- a Submit a Draft Final Remediation Plan and Executive Summary/Abstract. Upon completion of groundwater sampling, the stockpile was split into quadrants and a composite soil sample was collected into a two inch by six inch stainless steel tube. The soil sample was stored in a cooled ice chest and transported under chain-of- custody to Superior Analytical. Results of this soil sample, which are presented in the appendix, show non-detectable '� concentration for both BTEX and TPH as gas.