Boil lo mein noodles in a pot of lightly-salted water for 3-5 minutes, until al dente. Drain and rinse under cool water. Set aside.
Make the Sauce
While the noodles are boiling, whisk together light and dark soy sauces, Shaoxing wine, oyster sauce, sugar, sesame oil, and white pepper in a bowl. Set aside.
Make the Stir-Fry
Cut the scallions in half to divide them into the dark green and white/light green parts. Thinly-slice the white/light green parts. Cut the dark green parts into 1 or 2 segments of about 2 inches. Set aside.
Heat a wok or large (12-inch) skillet over high heat until very hot. Add 1 tablespoon vegetable oil and sauté carrots, snow peas, water chestnuts, and bamboo shoots for about 2 minutes, until crisp-tender. Remove from the pan and set aside.
Heat another tablespoon of oil in the wok or pan and sauté shrimp until pink, translucent, and lightly brown on the edges, about 2-3 minutes. Remove from the pan and set aside.
Heat the remaining 1 tablespoon of oil in the wok or pan and add garlic, ginger, and the sliced white and light green scallions. Sauté for 1 minute. Add sautéed vegetables, shrimp, noodles, and bean sprouts to the pan, tossing to combine.
Pour the sauce mixture around the sides of the pan and add the dark green scallion parts. Cook, tossing, for 1-2 minutes.
Taste the lo mein. Season to taste with additional soy sauce and ground white pepper, if desired. Serve hot or warm, with soy sauce to pass at the table, a drizzle of chili oil if you like the dish spicy, or a few drops of rice vinegar for a tangy finish (all optional).